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As the importance of renewable energy sources becomes more and more apparent, look to our top-quality journals for cutting-edge reports on solar cell and photovoltaic research.

In May 2007 the Institute for Scientific Information listed the Top 20 Most Cited Papers on Solar Cells, with papers published in Advanced Functional Materials number one on both lists:

Most cited paper (1997-2007):

Most cited paper (2005-2007):

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Suspended Silicon Microphotodiodes for Electrochemical and Biological Applications

Suspended Silicon Microphotodiodes for Electrochemical and Biological Applications

Suspended silicon microphotodiodes offer a simplified and cost-effective wireless tool for photovoltaic current generation in liquid media at the microscale. These devices are fabricated following a simple microfabrication process using silicon-based technologies. Furthermore, the applicability of these devices as electrochemical cells and for life science applications, as remote single-cell stimulators, is evaluated using cultured cortical neurons.

[Full Paper]
Carolina Vargas-Estevez, Marta Duch, Marcos Duque, Francisco Javier del Campo, Lilian Enriquez-Barreto, Gonzalo Murillo, Núria Torras, José A. Plaza, Carlos A. Saura, Jaume Esteve
Small, September 25, 2017, https://doi.org/10.1002/smll.201701920 Read article

Real-Time Observation of Iodide Ion Migration in Methylammonium Lead Halide Perovskites

Real‐Time Observation of Iodide Ion Migration in Methylammonium Lead Halide Perovskites

Ion migration in organometal halide perovskites is directly observed in real-time using photoluminescence wide-field microscopy. A lateral electrode configuration is used to apply an electric field. Accumulating iodide ions quench the photoluminescence of individual crystalline domains starting from the positive electrode moving to the negative, which corresponds to iodide ions moving the opposite way. Impedance measurements confirm the respective migration.

[Communication]
Cheng Li, Antonio Guerrero, Yu Zhong, Anna Gräser, Carlos Andres Melo Luna, Jürgen Köhler, Juan Bisquert, Richard Hildner, Sven Huettner
Small, September 25, 2017, https://doi.org/10.1002/smll.201701711 Read article

Impact of Interfacial Layers in Perovskite Solar Cells

Impact of Interfacial Layers in Perovskite Solar Cells

Upping the face: Interfacial engineering in perovskite solar cells is beneficial to improving photovoltaic performance because of the effective charge collection by changing the work function and/or dipole moment and reducing trapping states and recombination by improving electronic coupling through chemical binding. Bifunctional organic materials or nonstoichiometric approaches are effective methods to passivate grain boundaries of perovskite films.

[Review]
An-Na Cho, Nam-Gyu Park
ChemSusChem, September 25, 2017, https://doi.org/10.1002/cssc.201701095 Read article

Structure–Property Relationship Study of Donor and Acceptor 2,6-Disubstituted BODIPY Derivatives for High Performance Dye-Sensitized Solar Cells

Structure–Property Relationship Study of Donor and Acceptor 2,6‐Disubstituted BODIPY Derivatives for High Performance Dye‐Sensitized Solar Cells

Dyeing to meet you: A series of 2,6-disubstituted BODIPY derivatives have been synthesized and characterized, and subsequently tested for use in dye-sensitized solar cells. Theoretical calculations and spectroscopic data suggest reasons for the improved performance, including a power conversion efficiency as high as 6.4% for MPBTTCA.

[Full Paper]
Shih-Chieh Yeh, Li-Jing Wang, Hong-Ming Yang, Yu-Huei Dai, Chao-Wen Lin, Chin-Ti Chen, Ru-Jong Jeng
Chem. Eur. J., September 25, 2017, https://doi.org/10.1002/chem.201702285 Read article

Achieving High Open-Circuit Voltages up to 1.57 V in Hole-Transport-Material-Free MAPbBr3 Solar Cells with Carbon Electrodes

Achieving High Open‐Circuit Voltages up to 1.57 V in Hole‐Transport‐Material‐Free MAPbBr3 Solar Cells with Carbon Electrodes

An open-circuit voltage (Voc) of 1.57 V under AM1.5 sunlight is obtained in hole-transport-materials-free planar MAPbBr3 solar cells with carbon (graphite) electrodes. Compared to the large band offset between MAPbBr3 and graphite, a small (≤0.43 V) voltage loss across the MAPbBr3/graphite interface is measured. The band-edge electroluminescence from MAPbBr3 devices supports no back transfer of electrons across the MAPbBr3/TiO2 interface.

[Communication]
Yongqi Liang, Yajuan Wang, Cheng Mu, Sen Wang, Xinnan Wang, Dongsheng Xu, Licheng Sun
Adv. Energy Mater., September 25, 2017, https://doi.org/10.1002/aenm.201701159 Read article

Localized Surface Plasmon Induced Position-Sensitive Photodetection in Silicon-Nanowire-Modified Ag/Si

Localized Surface Plasmon Induced Position‐Sensitive Photodetection in Silicon‐Nanowire‐Modified Ag/Si

Sensitivity is one of the main technical specifications of position-sensitive detectors. However, weak light absorption and low photoelectric conversion are two limitations to obtain prominent sensitivity. Based on localized surface plasmon, a large enhanced lateral photovoltaic effect is detected in a silicon nanowire-modified metal–semiconductor structure. Thus, a high position-dependent sensitivity is achieved in millimeter range.

[Full Paper]
Chunlian Mei, Shuai Liu, Xu Huang, Zhikai Gan, Peiqi Zhou, Hui Wang
Small, September 22, 2017, https://doi.org/10.1002/smll.201701726 Read article

Effect of Formamidinium/Cesium Substitution and PbI2 on the Long-Term Stability of Triple-Cation Perovskites

Effect of Formamidinium/Cesium Substitution and PbI2 on the Long‐Term Stability of Triple‐Cation Perovskites

Addition and multiple cations: In triple-cation mixed-halide perovskite films, the addition of excess PbI2 is known to benefit the performance, but its impact on the degradation kinetics of the perovskite is less well known. In this study, the amount of PbI2 in the triple-cation perovskite films is varied and the degradation kinetics monitored. The inclusion of excess PbI2 adversely affects the stability of the material but also leads to enhanced grain sizes and better optical absorption.

[Full Paper]
Shashwat Shukla, Sudhanshu Shukla, Lew Jia Haur, Sai S. H. Dintakurti, Guifang Han, Anish Priyadarshi, Tom Baikie, Subodh G. Mhaisalkar, Nripan Mathews
ChemSusChem, September 22, 2017, https://doi.org/10.1002/cssc.201701203 Read article

Synthetic Manipulation of Hybrid Perovskite Systems in Search of New and Enhanced Functionalities

Synthetic Manipulation of Hybrid Perovskite Systems in Search of New and Enhanced Functionalities

The manipulation approach: We discuss the advances of synthetic manipulations of organic–inorganic hybrid perovskite-based systems, covering the areas of thin films, single crystals, and quantum nanostructures (0 D quantum dots, 1 D nanowires, nanorods). We also discuss the challenges and the opportunities in this rapidly evolving field.

[Minireview]
Rounak Naphade, Satyawan Nagane, Umesh Bansode, Mukta Tathavadekar, Aditya Sadhanala, Satishchandra Ogale
ChemSusChem, September 22, 2017, https://doi.org/10.1002/cssc.201701093 Read article

Black Phosphorus Quantum Dots Used for Boosting Light Harvesting in Organic Photovoltaics

Black Phosphorus Quantum Dots Used for Boosting Light Harvesting in Organic Photovoltaics

Strong light absorption: The power conversion efficiencies of organic photovoltaics have been improved by introducing black phosphorus quantum dots (BPQDs; 0.055 wt % relative to the donor polymers) due to the boosted light harvesting of the devices. The effect is attributed to the strong light absorption as well as the two-dimensional structure of the BPQDs. A pronounced size effect of BPQDs on the performance enhancement is observed.

[Communication]
Shenghua Liu, Shenghuang Lin, Peng You, Charles Surya, Daniel Lau, Feng Yan
Angew. Chem. Int. Ed., September 22, 2017, https://doi.org/10.1002/anie.201707510 Read article

Formation of Stable Tin Perovskites Co-crystallized with Three Halides for Carbon-Based Mesoscopic Lead-Free Perovskite Solar Cells

Formation of Stable Tin Perovskites Co‐crystallized with Three Halides for Carbon‐Based Mesoscopic Lead‐Free Perovskite Solar Cells

Tin in: Stable tin perovskites co-crystalized with three different halide elements (I, Br, and Cl) were produced via the reaction of methylammonium (MA) iodide with SnCl2/SnBr2 mixtures at the ratios equal to or less than 25/75. The best device made of a carbon-based mesoscopic electrode and MASnIBr1.8Cl0.2 exhibited PCE 3.1 %.

[Communication]
Cheng-Min Tsai, Nayantara Mohanta, Chi-Yung Wang, Yu-Pei Lin, Yaw-Wen Yang, Chien-Lung Wang, Chen-Hsiung Hung, Eric Wei-Guang Diau
Angew. Chem. Int. Ed., September 22, 2017, https://doi.org/10.1002/anie.201707037 Read article

Highly Reproducible Sn-Based Hybrid Perovskite Solar Cells with 9% Efficiency

Highly Reproducible Sn‐Based Hybrid Perovskite Solar Cells with 9% Efficiency

An all-tin-based perovskite solar cell with a record power conversion efficiency of 9% is reported for the first time. The outstanding performance is attributed to the fact that the addition of a trace amount of 2D tin perovskite initiates the homogenous growth of highly crystalline and oriented FASnI3 grains at low temperature.

[Communication]
Shuyan Shao, Jian Liu, Giuseppe Portale, Hong-Hua Fang, Graeme R. Blake, Gert H. ten Brink, L. Jan Anton Koster, Maria Antonietta Loi
Adv. Energy Mater., September 22, 2017, https://doi.org/10.1002/aenm.201702019 Read article

Donor–Acceptor Type Dopant-Free, Polymeric Hole Transport Material for Planar Perovskite Solar Cells (19.8%)

Donor–Acceptor Type Dopant‐Free, Polymeric Hole Transport Material for Planar Perovskite Solar Cells (19.8%)

This study examines a highly efficient perovskite solar cell (PSC) that employs a dopant-free hole transport material (HTM). A polymeric HTM (PTEG) combined with a tetraethylene glycol group is synthesized and systematically characterized. Results indicate that the PSC employing PTEG exhibits the highest efficiency (19.8%) in the planar device.

[Communication]
Guan-Woo Kim, Junwoo Lee, Gyeongho Kang, Taewan Kim, Taiho Park
Adv. Energy Mater., September 22, 2017, https://doi.org/10.1002/aenm.201701935 Read article

Ternary Organic Solar Cells with >11% Efficiency Incorporating Thick Photoactive Layer and Nonfullerene Small Molecule Acceptor

Ternary Organic Solar Cells with >11% Efficiency Incorporating Thick Photoactive Layer and Nonfullerene Small Molecule Acceptor

A ternary organic solar cell with a thick photoactive layer is constructed by introducing a nonfullerene small molecule acceptor into the host binary system based on a novel wide band-gap donor polymer and PC71BM, achieving high Voc of 0.96 V and PCE of 11.2%, which exhibits significant application potential in further roll-to-roll production.

[Full Paper]
Tong Zhang, Xiaoli Zhao, Dalei Yang, Yumeng Tian, Xiaoniu Yang
Adv. Energy Mater., September 22, 2017, https://doi.org/10.1002/aenm.201701691 Read article

Charge Transport Modulation of a Flexible Quantum Dot Solar Cell Using a Piezoelectric Effect

Charge Transport Modulation of a Flexible Quantum Dot Solar Cell Using a Piezoelectric Effect

The modulation of the charge carrier transport in flexible quantum dot solar cells is demonstrated by harnessing the piezoelectric potential. Modulation of the junction properties by the piezoelectric potential results in a 37% enhancement in the power conversion efficiency, which is attributed to an efficient dissociation and extraction of the photogenerated charge carriers and a reduction in the nonradiative recombination.

[Communication]
Yuljae Cho, Paul Giraud, Bo Hou, Young-Woo Lee, John Hong, Sanghyo Lee, Sangyeon Pak, Juwon Lee, Jae Eun Jang, Stephen M. Morris, Jung Inn Sohn, SeungNam Cha, Jong Min Kim
Adv. Energy Mater., September 22, 2017, https://doi.org/10.1002/aenm.201700809 Read article

Diphenyl-2-pyridylamine-Substituted Porphyrins as Hole-Transporting Materials for Perovskite Solar Cells

Diphenyl‐2‐pyridylamine‐Substituted Porphyrins as Hole‐Transporting Materials for Perovskite Solar Cells

A hole new world: A series of porphyrin-based hole-transporting materials (HTMs) has been developed for low-temperature perovskite solar cells (PSCs). Diphenyl-2-pyridylamine (DPPA)-substituted porphyrin HTM provides high hole mobility and well-matched energy levels with MAPbI3 perovskite active layers, which improve the charge-extraction properties of PSCs, demonstrating performances comparable to those of spiro-OMeTAD-based devices.

[Full Paper]
Un-Hak Lee, Randi Azmi, Septy Sinaga, Sunbin Hwang, Seung Hun Eom, Tae-Wook Kim, Sung Cheol Yoon, Sung-Yeon Jang, In Hwan Jung
ChemSusChem, September 21, 2017, https://doi.org/10.1002/cssc.201701526 Read article

Al2O3 Underlayer Prepared by Atomic Layer Deposition for Efficient Perovskite Solar Cells

Al2O3 Underlayer Prepared by Atomic Layer Deposition for Efficient Perovskite Solar Cells

Tunneling through the underlayer! Atomic layer deposition (ALD) is used to prepare a compact Al2O3 underlayer for perovskite solar cells. The thickness of the Al2O3 layer can be controlled well by adjusting the deposition cycles during the ALD process. The Al2O3 layer can effectively block electron recombination at the perovskite/fluorine-doped tin oxide interface and can sufficiently transport the electrons through tunneling.

[Full Paper]
Jinbao Zhang, Adam Hultqvist, Tian Zhang, Liangcong Jiang, Changqing Ruan, Li Yang, Yibing Cheng, Marika Edoff, Erik M. J. Johansson
ChemSusChem, September 21, 2017, https://doi.org/10.1002/cssc.201701160 Read article

Energetic Barriers to Interfacial Charge Transfer and Ion Movement in Perovskite Solar Cells

Energetic Barriers to Interfacial Charge Transfer and Ion Movement in Perovskite Solar Cells

Ionic movement: Application of a forward bias to the cell leads to ion movement. Decreasing bias voltage is expected to reduce the current; however, the ion current results in an overall increase in measured current. Below the threshold voltage for ion movement typical diode behavior is observed even though this increases the depletion layer and concomitantly decreases the charge concentration, charge extraction, and charge recombination.

[Article]
Azar Sadollahkhani, Peng Liu, Valentina Leandri, Majid Safdari, Wei Zhang, James M. Gardner
ChemPhysChem, September 21, 2017, https://doi.org/10.1002/cphc.201700740 Read article

Ultrafast Flame Annealing of TiO2 Paste for Fabricating Dye-Sensitized and Perovskite Solar Cells with Enhanced Efficiency

Ultrafast Flame Annealing of TiO2 Paste for Fabricating Dye‐Sensitized and Perovskite Solar Cells with Enhanced Efficiency

Flame is an attractive alternative to the commonly used box furnace to form mesoporous TiO2 films. It demonstrates the advantages of a significantly reduced processing time, better removal of organic impurities, and efficient connectivity. The energy state of the TiO2 is also modified by carbothermic reduction during the flame, facilitating efficient charge injection from the dye/perovskite to TiO2.

[Communication]
Jung Kyu Kim, Sung Uk Chai, Yoonjun Cho, Lili Cai, Sung June Kim, Sangwook Park, Jong Hyeok Park, Xiaolin Zheng
Small, September 20, 2017, https://doi.org/10.1002/smll.201702260 Read article

Large-Area Patterning of Metal Nanostructures by Dip-Pen Nanodisplacement Lithography for Optical Applications

Large‐Area Patterning of Metal Nanostructures by Dip‐Pen Nanodisplacement Lithography for Optical Applications

High-throughput massively parallel dip-pen nanolithography is employed for the generation of centimeter scale metallic nanostructures. First, the visible plasmonic resonance for the large-area gold nanorod patterns is demonstrated. Moreover, through patterning, extreme highly transparent conducting electrodes of Au nanomesh with low sheet resistance are fabricated. The device performance is superior to the analogous indium tin oxide based device.

[Communication]
Lina Chen, Xiaoling Wei, Xuechang Zhou, Zhuang Xie, Kan Li, Qifeng Ruan, Chaojian Chen, Jianfang Wang, Chad A. Mirkin, Zijian Zheng
Small, September 20, 2017, https://doi.org/10.1002/smll.201702003 Read article

Functionalization of Silicon Nanostructures for Energy-Related Applications

Functionalization of Silicon Nanostructures for Energy‐Related Applications

Functionalization of silicon nanostructures improve energy-related device performances. Shortened carrier collection paths and enhancement of light-trapping effect by 1-dimensional (1D) nanowire structures and nonradiative energy transfer effect by 0-dimensional (0D) nanocrystal structures effectively increase the power conversion efficiency of solar cells. Silicon-related nanocomposite structures also show higher capacity than commercially available lithium-ion battery anodes and more stable cyclic property than pure Si materials.

[Review]
Naoki Fukata, Thiyagu Subramani, Wipakorn Jevasuwan, Mrinal Dutta, Yoshio Bando
Small, September 20, 2017, https://doi.org/10.1002/smll.201701713 Read article

Constructing a Strongly Absorbing Low-Bandgap Polymer Acceptor for High-Performance All-Polymer Solar Cells

Constructing a Strongly Absorbing Low‐Bandgap Polymer Acceptor for High‐Performance All‐Polymer Solar Cells

Energy conversion: Embedding an acceptor–donor–acceptor-structured organic semiconductor building block into a polymer main chain creates an excellent low-band-gap polymer acceptor with red-shifted absorption and high absorption coefficient. The polymer acceptor provides a record-high power conversion efficiency of 9.19 % for all-polymer solar cells.

[Communication]
Zhi-Guo Zhang, Yankang Yang, Jia Yao, Lingwei Xue, Shanshan Chen, Xiaojun Li, William Morrison, Changduk Yang, Yongfang Li
Angew. Chem. Int. Ed., September 19, 2017, https://doi.org/10.1002/anie.201707678 Read article

Understanding the Photovoltaic Performance of Perovskite–Spirobifluorene Solar Cells

Understanding the Photovoltaic Performance of Perovskite–Spirobifluorene Solar Cells

Add a pinch of salt: The photovoltaic performance in perovskite solar cells with pristine and lithium-doped hole-transport layers (spiro-OMeTAD) is investigated. The performance of these cells improves upon exposure to air, however, additional doping with a cobalt salt (FK209) delivers a device with improved performance without the need for air.

[Article]
Zhen Song, Jiang Liu, Gang Wang, Wentao Zuo, Cheng Liao, Jun Mei
ChemPhysChem, September 18, 2017, https://doi.org/10.1002/cphc.201700910 Read article

Polymer Doping for High-Efficiency Perovskite Solar Cells with Improved Moisture Stability

Polymer Doping for High‐Efficiency Perovskite Solar Cells with Improved Moisture Stability

The doping of polymer additives into MAPbI3 films is reported. This allows for enlarged MAPbI3 crystal grains by controlling the crystallization processes and decreased trap-state densities by passivating the MAPbI3 crystal grain boundaries. As a result, the device based on the formed continuous, few-defect, large MAPbI3 grains demonstrates improved efficiency from 17.43 to 19.19%, and relatively improved moisture stability.

[Communication]
Jiexuan Jiang, Qian Wang, Zhiwen Jin, Xisheng Zhang, Jie Lei, Haijun Bin, Zhi-Guo Zhang, Yongfang Li, Shengzhong (Frank) Liu
Adv. Energy Mater., September 18, 2017, https://doi.org/10.1002/aenm.201701757 Read article

Doped Copper Phthalocyanine via an Aqueous Solution Process for Normal and Inverted Perovskite Solar Cells

Doped Copper Phthalocyanine via an Aqueous Solution Process for Normal and Inverted Perovskite Solar Cells

p-Type-doped copper phthalocyanine-3,4′,4″,4″′-tetra-sulfonated acid tetra sodium salt (TS-CuPc) by tetrafluorotetracyanoquinodimethane (F4-TCNQ) with improved film conductivity and hole mobility is realized via a solution process. The composite film is used as a hole-transporting layer in both p–i–n structure and n–i–p structure devices. A champion n–i–p structure device with a power conversion efficiency of 20.16% is obtained.

[Full Paper]
Jin-Miao Wang, Zhao-Kui Wang, Meng Li, Cong-Cong Zhang, Lu-Lu Jiang, Ke-Hao Hu, Qing-Qing Ye, Liang-Sheng Liao
Adv. Energy Mater., September 18, 2017, https://doi.org/10.1002/aenm.201701688 Read article

Molecular Interlayers in Hybrid Perovskite Solar Cells

Molecular Interlayers in Hybrid Perovskite Solar Cells

Small molecules are increasingly being used as interlayers in perovskite solar cells to modify band energy offsets at an interface, to improve the morphology of active layers, and to enhance the long-term stability of the devices. This article reviews recent advances in the use of molecular interlayers in perovskite cells and introduces relevant examples from the field of organic solar cells.

[Review]
Wentao Deng, Xinxing Liang, Peter S. Kubiak, Petra J. Cameron
Adv. Energy Mater., September 18, 2017, https://doi.org/10.1002/aenm.201701544 Read article

On the Use of Luminescence Intensity Images for Quantified Characterization of Perovskite Solar Cells: Spatial Distribution of Series Resistance

On the Use of Luminescence Intensity Images for Quantified Characterization of Perovskite Solar Cells: Spatial Distribution of Series Resistance

This work demonstrates how steady-state luminescence imaging of perovskite solar cells can be used to quantify valuable device-level parameters. Electrically biased photoluminescence measurements are used to spatially resolve the series resistance of perovskite solar cells. Thus, the power of luminescence imaging to quantifiably characterisz large area perovskite solar cells in a very short time is demonstrated.

[Full Paper]
Daniel Walter, Yiliang Wu, The Duong, Jun Peng, Liangcong Jiang, Kean Chern Fong, Klaus Weber
Adv. Energy Mater., September 18, 2017, https://doi.org/10.1002/aenm.201701522 Read article

Design of Cyanovinylene-Containing Polymer Acceptors with Large Dipole Moment Change for Efficient Charge Generation in High-Performance All-Polymer Solar Cells

Design of Cyanovinylene‐Containing Polymer Acceptors with Large Dipole Moment Change for Efficient Charge Generation in High‐Performance All‐Polymer Solar Cells

High-performance polymer acceptors with high electron mobility and large dipole moment difference are developed by introducing electron-withdrawing cyanovinylene groups into naphthalenediimide-based polymers. All-polymer solar cells fabricated using these new polymer acceptors exhibit outstanding power conversion efficiencies of up to 7.4% and high fill factors (65%) as a result of efficient exciton dissociation and enhanced charge transport.

[Full Paper]
Han-Hee Cho, Seonha Kim, Taesu Kim, Vijaya Gopalan Sree, Sung-Ho Jin, Felix Sunjoo Kim, Bumjoon J. Kim
Adv. Energy Mater., September 18, 2017, https://doi.org/10.1002/aenm.201701436 Read article

A New Passivation Route Leading to Over 8% Efficient PbSe Quantum-Dot Solar Cells via Direct Ion Exchange with Perovskite Nanocrystals

A New Passivation Route Leading to Over 8% Efficient PbSe Quantum‐Dot Solar Cells via Direct Ion Exchange with Perovskite Nanocrystals

PbSe quantum dots (QDs) with robust hybrid halide passivation are obtained via ion exchange with CsPbX3 halide perovskite nanocrystals, resulting in significant improvement in their photoluminescence quantum yield. A champion solar cell fabricated with these passivated PbSe QDs can achieve an efficiency of over 8%, as well as excellent air-stability.

[Communication]
Zhilong Zhang, Zihan Chen, Lin Yuan, Weijian Chen, Jianfeng Yang, Bo Wang, Xiaoming Wen, Jianbing Zhang, Long Hu, John A. Stride, Gavin J. Conibeer, Robert J. Patterson, Shujuan Huang
Adv. Mater., September 18, 2017, https://doi.org/10.1002/adma.201703214 Read article

Highly Conductive and Transparent Large-Area Bilayer Graphene Realized by MoCl5 Intercalation

Highly Conductive and Transparent Large‐Area Bilayer Graphene Realized by MoCl5 Intercalation

Intercalation of MoCl5 into large-area bilayer graphene (BLG) grown by chemical vapor deposition is performed. Twist stacking gives a much higher degree of MoCl5 intercalation than AB stacking. A low sheet resistance with high optical transmittance is obtained by using twist-rich BLG. A transparent electrode suitable for use in organic solar cells is developed from this intercalated bilayer.

[Communication]
Hiroki Kinoshita, Il Jeon, Mina Maruyama, Kenji Kawahara, Yuri Terao, Dong Ding, Rika Matsumoto, Yutaka Matsuo, Susumu Okada, Hiroki Ago
Adv. Mater., September 18, 2017, https://doi.org/10.1002/adma.201702141 Read article

Chalcogen-Atom-Annulated Perylene Diimide Trimers for Highly Efficient Nonfullerene Polymer Solar Cells

Chalcogen‐Atom‐Annulated Perylene Diimide Trimers for Highly Efficient Nonfullerene Polymer Solar Cells

Two novel perylene diimide trimers annulated with different chalcogen atoms, TriPDI-S and TriPDI-Se, are synthesized for highly efficient nonfullerene polymer solar cells. TriPDI-Se devices show a higher power conversion efficiency of 8.82% than that of TriPDI-S devices (7.86%), which can be attributed to its stronger absorption, higher crystallinity, and larger charge carrier mobility.

[Communication]
Yuwei Duan, Xiaopeng Xu, Ying Li, Zuojia Li, Qiang Peng
Macromol. Rapid Commun., September 15, 2017, https://doi.org/10.1002/marc.201700405 Read article

Energy Band Transition and Voltage Compensation via Surface Stoichiometry Alteration in p-Type Dye-Sensitized Solar Cells

Energy Band Transition and Voltage Compensation via Surface Stoichiometry Alteration in p‐Type Dye‐Sensitized Solar Cells

For NiO semiconductor, different stoichiometries of the surface Ni and O atoms change the Fermi level and valence-band energy markedly, which determines the open-circuit voltage of p-type dye-sensitized solar cells (p-DSSCs) with a fixed redox couple. This method provides a new approach for the customization of the interface behavior, quasi-Fermi level, and valence-band position of p-DSSCs.

[Rapid Research Letter]
Chenghao Xin, Yu Wang, Shicong Zhang, Liang Xu, Ying Yu, Huaide Xiang, Wenjun Wu, Jianli Hua
Phys. Status Solidi RRL, September 14, 2017, https://doi.org/10.1002/pssr.201700258 Read article

Enhancing the Performance of Inverted Organic Photovoltaics Using Cathode Interlayers Based on Solution-Processable Tetrabutylammonium Halides

Enhancing the Performance of Inverted Organic Photovoltaics Using Cathode Interlayers Based on Solution‐Processable Tetrabutylammonium Halides

Tetrabutylammonium halides (TBAXs, X = Cl, Br, and I) were used as a cathode interlayer for efficient inverted organic photovoltaics. With TBAX interlayers, an S-shaped kink in current density–voltage characteristics was removed and power conversion efficiencies were dramatically improved. The work function of ITO was significantly lowered which resulted in a minimum offset between the Fermi level of ITO and the lowest unoccupied molecular orbital level of C60.

[Rapid Research Letter]
Gyeongho Hyun, Dongguen Shin, Hyunbok Lee, Yeonjin Yi
Phys. Status Solidi RRL, September 14, 2017, https://doi.org/10.1002/pssr.201700250 Read article

Understanding the Impact of Oligomeric Polystyrene Side Chain Arrangement on the All-Polymer Solar Cell Performance

Understanding the Impact of Oligomeric Polystyrene Side Chain Arrangement on the All‐Polymer Solar Cell Performance

All-polymer solar cells consisting of polystyrene (PS) oligomer side chain attached donor and acceptor polymers are investigated to reveal the effect of PS side chain substituted arrangement. An increase in domain purity and decrease in domain size are observed when the PS side chain is attached to donor and acceptor polymers, respectively, which mainly results from the solubility parameter of the polymers.

[Full Paper]
Tadanori Kurosawa, Xiaodan Gu, Kevin L. Gu, Yan Zhou, Hongping Yan, Cheng Wang, Ging-Ji Nathan Wang, Michael F. Toney, Zhenan Bao
Adv. Energy Mater., September 14, 2017, https://doi.org/10.1002/aenm.201701552 Read article

Deformable and Transparent Ionic and Electronic Conductors for Soft Energy Devices

Deformable and Transparent Ionic and Electronic Conductors for Soft Energy Devices

The latest advances in stretchable transparent ionic and electronic conductors are reviewed with a focus on the integration of them into soft energy storage and conversion systems. The fundamental insights, challenges, and opportunities for this emerging field of materials science are also discussed to offer some guidelines for the future innovative development.

[Review]
Sangbaek Park, Kaushik Parida, Pooi See Lee
Adv. Energy Mater., September 14, 2017, https://doi.org/10.1002/aenm.201701369 Read article

Microstructural Characterisations of Perovskite Solar Cells – From Grains to Interfaces: Techniques, Features, and Challenges

Microstructural Characterisations of Perovskite Solar Cells – From Grains to Interfaces: Techniques, Features, and Challenges

The microstructure of perovskite solar cells has been shown to have a large impact on their properties. In this progress report, some of the most important findings relating to how different microstructures influence the performance of perovskite solar cells are summarized, and the possible impact of different characterisation techniques on the results obtained from them are discussed.

[Progress Report]
Mathias Uller Rothmann, Wei Li, Joanne Etheridge, Yi-Bing Cheng
Adv. Energy Mater., September 14, 2017, https://doi.org/10.1002/aenm.201700912 Read article

Stabilizing the Efficiency Beyond 20% with a Mixed Cation Perovskite Solar Cell Fabricated in Ambient Air under Controlled Humidity

Stabilizing the Efficiency Beyond 20% with a Mixed Cation Perovskite Solar Cell Fabricated in Ambient Air under Controlled Humidity

The reproducible high performance of a triple-cation-based mixed halide perovskite cell fabricated by appropriate control of crystal growth and post-annealing under controlled relative humidity (R.H. < 25%) and in ambient air conditions is demonstrated. The device fabrication shows high yield in producing power conversion efficiencies up to 20.8% with a cell aperture size of 25 mm2.

[Communication]
Trilok Singh, Tsutomu Miyasaka
Adv. Energy Mater., September 14, 2017, https://doi.org/10.1002/aenm.201700677 Read article

Triplet Harvesting from Intramolecular Singlet Fission in Polytetracene

Triplet Harvesting from Intramolecular Singlet Fission in Polytetracene

A conjugated tetracene homopolymer is synthesized, investigated spectroscopically, and employed as the active layer in photovoltaic devices. Spectroscopic measurements reveal sub-picosecond singlet fission in this material in solution or in films. Films facilitate dissociation of the resulting triplet pairs. Solution-processed devices employing polytetracene achieve singlet-fission-based photocurrent enhancement, but only when the acceptor energy levels are sufficiently low.

[Communication]
Andrew B. Pun, Samuel N. Sanders, Elango Kumarasamy, Matthew Y. Sfeir, Daniel N. Congreve, Luis M. Campos
Adv. Mater., September 14, 2017, https://doi.org/10.1002/adma.201701416 Read article

Improvement and Regeneration of Perovskite Solar Cells via Methylamine Gas Post-Treatment

Improvement and Regeneration of Perovskite Solar Cells via Methylamine Gas Post‐Treatment

The crystals of the perovskite films are reconstructed by post-treating the MAPbI3 devices with methylamine gas, yielding high power conversion efficiency (PCE) of 15.26%, 128.8% higher than that of the device before processing. More importantly, the photodegraded perovskite solar cells are regenerated via crystal reconstruction and the PCE recovers to 91% of the initial value after two cycles of the photodegradation-recovery process.

[Full Paper]
Li Hong, Yue Hu, Anyi Mei, Yusong Sheng, Pei Jiang, Chengbo Tian, Yaoguang Rong, Hongwei Han
Adv. Funct. Mater., September 14, 2017, https://doi.org/10.1002/adfm.201703060 Read article

Cellulose-Based Nanomaterials for Energy Applications

Cellulose‐Based Nanomaterials for Energy Applications

The most recent advancements of processing, integration, and application of cellulose nanomaterials in the areas of solar energy harvesting, energy storage, and mechanical energy harvesting are reviewed, underlining cellulose nanomaterials as a new energy material with tremendous materials science value and application potential in many energy-related fields.

[Review]
Xudong Wang, Chunhua Yao, Fei Wang, Zhaodong Li
Small, September 13, 2017, https://doi.org/10.1002/smll.201702240 Read article

Self-Assembly Atomic Stacking Transport Layer of 2D Layered Titania for Perovskite Solar Cells with Extended UV Stability

Self‐Assembly Atomic Stacking Transport Layer of 2D Layered Titania for Perovskite Solar Cells with Extended UV Stability

The self-assembly atomic stacking transporting layer based on 2D titania atomic sheets exhibits unique advantages when used as an electron transporting layer for the development of stable and high-performance perovskite solar cells. The advantages are shown to include high UV transparency, negligible (or very low) oxygen vacancies, and solution processability.

[Full Paper]
Tzu-Pei Chen, Chung-Wei Lin, Shao-Sian Li, Yung-Han Tsai, Cheng-Yen Wen, Wendy Jessica Lin, Fei-Man Hsiao, Ya-Ping Chiu, Kazuhito Tsukagoshi, Minoru Osada, Takayoshi Sasaki, Chun-Wei Chen
Adv. Energy Mater., September 13, 2017, https://doi.org/10.1002/aenm.201701722 Read article

Conjugated Polymers Based on Difluorobenzoxadiazole toward Practical Application of Polymer Solar Cells

Conjugated Polymers Based on Difluorobenzoxadiazole toward Practical Application of Polymer Solar Cells

Two new conjugated polymers based on difluorobenzoxadiazole bring real-world applications of polymer solar cells closer. They integrate multiple advantages including high power conversion efficiency built on low-cost acceptors, allowing thick active layers, and processability from green solvents under mild conditions. Particularly, benzodithiophene-difluorobenzoxadiazole-2-decyltetradecyl (BDT-ffBX-DT) is a champion in meeting a comprehensive list of prerequisites for future application of polymer solar cells.

[Communication]
Junyi Wang, Shiliang Wang, Chunhui Duan, Fallon J. M. Colberts, Jiangquan Mai, Xi Liu, Xiao'e Jia, Xinhui Lu, René A. J. Janssen, Fei Huang, Yong Cao
Adv. Energy Mater., September 11, 2017, https://doi.org/10.1002/aenm.201702033 Read article

Accurate Characterization of Triple-Junction Polymer Solar Cells

Accurate Characterization of Triple‐Junction Polymer Solar Cells

The external quantum efficiency of triple-junction cells is accurately measured following a new protocol that takes into account light bias and voltage bias. Integration of the external quantum efficiency to determine the short-circuit current density matches with the value under simulated AM1.5G illumination conditions and results in a power conversion efficiency of 9.77 ± 0.29%.

[Full Paper]
Dario Di Carlo Rasi, Koen H. Hendriks, Martijn M. Wienk, René A. J. Janssen
Adv. Energy Mater., September 11, 2017, https://doi.org/10.1002/aenm.201701664 Read article

Designing 1,5-Naphthyridine-2,6-dione-Based Conjugated Polymers for Higher Crystallinity and Enhanced Light Absorption to Achieve 9.63% Efficiency Polymer Solar Cells

Designing 1,5‐Naphthyridine‐2,6‐dione‐Based Conjugated Polymers for Higher Crystallinity and Enhanced Light Absorption to Achieve 9.63% Efficiency Polymer Solar Cells

A novel 1,5-naphthyridine-2,6-dione-based conjugated polymer is developed and applied as a donor in the active layers of efficient polymer solar cells. PNTDT-2F2T exhibits outstanding polymer crystallinity and absorption coefficient. A polymer solar cell device made using PNTDT-2F2T exhibits a high power conversion efficiency (9.63%) with a thick active layer (>200 nm).

[Full Paper]
Won Sik Yoon, Dong Won Kim, Min-Woo Choi, Jun-Mo Park, Soo Young Park
Adv. Energy Mater., September 11, 2017, https://doi.org/10.1002/aenm.201701467 Read article

Charge Carrier Extraction in Organic Solar Cells Governed by Steady-State Mobilities

Charge Carrier Extraction in Organic Solar Cells Governed by Steady‐State Mobilities

Charge transport in organic photovoltaic devices is often characterized by steady-state mobilities. However, the suitability of steady-state mobilities to describe charge transport has recently been called into question and it has been argued that dispersion plays a significant role. In this paper, the importance of the dispersion of charge carrier motion on the performance of organic photovoltaic devices is investigated.

[Full Paper]
Vincent M. Le Corre, Azadeh Rahimi Chatri, Nutifafa Y. Doumon, L. Jan Anton Koster
Adv. Energy Mater., September 11, 2017, https://doi.org/10.1002/aenm.201701138 Read article

8.0% Efficient All-Polymer Solar Cells with High Photovoltage of 1.1 V and Internal Quantum Efficiency near Unity

8.0% Efficient All‐Polymer Solar Cells with High Photovoltage of 1.1 V and Internal Quantum Efficiency near Unity

High-performance all-polymer solar cells with high Voc of 1.1 V and PCE of 8.0% are realized by incorporating a pair of the donor polymer poly[4,8-bis(5-(2-octylthio)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl-alt-(5-(2-ethylhexyl)-4H-thieno[3,4-c]pyrrole-4,6(5H)-dione)-1,3-diyl] and acceptor polymer poly[[N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-thiophene-2,5-diyl]. The simultaneously high Voc and power conversion efficiency stem from the low photon energy loss and high internal quantum efficiency near unity.

[Full Paper]
Xiaofeng Xu, Zhaojun Li, Wei Zhang, Xiangyi Meng, Xianshao Zou, Dario Di Carlo Rasi, Wei Ma, Arkady Yartsev, Mats R. Andersson, René A. J. Janssen, Ergang Wang
Adv. Energy Mater., September 11, 2017, https://doi.org/10.1002/aenm.201700908 Read article

The Role of Rubidium in Multiple-Cation-Based High-Efficiency Perovskite Solar Cells

The Role of Rubidium in Multiple‐Cation‐Based High‐Efficiency Perovskite Solar Cells

The confluence of low trap-assisted charge-carrier recombination, low resistance offered to holes at the perovskite/2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9-spirobifluorene interface with a low series resistance (RS), and a lower value of charge storage, leads to the realization of higher photovoltaic performance when an extra cation (Rb) is incorporated into the perovskite films.

[Communication]
Pankaj Yadav, M. Ibrahim Dar, Neha Arora, Essa A. Alharbi, Fabrizio Giordano, Shaik Mohammed Zakeeruddin, Michael Grätzel
Adv. Mater., September 11, 2017, https://doi.org/10.1002/adma.201701077 Read article

Wearable Large-Scale Perovskite Solar-Power Source via Nanocellular Scaffold

Wearable Large‐Scale Perovskite Solar‐Power Source via Nanocellular Scaffold

A nanocellular scaffold is introduced to construct a mechanics buffer layer and optics resonant cavity in a flexible perovskite solar cell. A power conversion efficiency of 12.32% is achieved with a flexible, large-scale device (polyethylene terephthalate substrate, indium tin oxide-free, 1.01 cm2). Moreover, the devices, which demonstrate excellent performance and mechanical stability, are practically fabricated in modules for a wearable solar-power source.

[Communication]
Xiaotian Hu, Zengqi Huang, Xue Zhou, Pengwei Li, Yang Wang, Zhandong Huang, Meng Su, Wanjie Ren, Fengyu Li, Mingzhu Li, Yiwang Chen, Yanlin Song
Adv. Mater., September 08, 2017, https://doi.org/10.1002/adma.201703236 Read article

An Amidine-Type n-Dopant for Solution-Processed Field-Effect Transistors and Perovskite Solar Cells

An Amidine‐Type n‐Dopant for Solution‐Processed Field‐Effect Transistors and Perovskite Solar Cells

An effective solution-processed amidine-type n-dopant of 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU), which can universally dope electron acceptor materials, including PC61BM, N2200, and ITIC, is reported. The DBU doping can enhance the performance of the perovskite solar cells and the electron mobility of the field-effect transistors.

[Full Paper]
Lin Hu, Tiefeng Liu, Jiashun Duan, Xiaoyi Ma, Congwu Ge, Youyu Jiang, Fei Qin, Sixing Xiong, Fangyuan Jiang, Bin Hu, Xike Gao, Yuanping Yi, Yinhua Zhou
Adv. Funct. Mater., September 08, 2017, https://doi.org/10.1002/adfm.201703254 Read article

Carbon Nanotube Based Inverted Flexible Perovskite Solar Cells with All-Inorganic Charge Contacts

Carbon Nanotube Based Inverted Flexible Perovskite Solar Cells with All‐Inorganic Charge Contacts

A novel, thermal- and photostable inverted perovskite solar cell is developed, employing a SnO2-coated carbon nanotube film as cathode (substrate/NiO-perovskite/Al2O3-perovskite/SnO 2@CSCNT-perovskite). The deposition of the electron-extracting SnO2 on the CSCNT cathode increases device efficiencies, eliminates device hysteresis, and suppresses charge combination. Solar cells fabricated with SnO2@CSCNT cathodes show power conversion efficiencies of 14.3 and 10.5% on rigid and flexible substrates, respectively.

[Full Paper]
Qiang Luo, He Ma, Feng Hao, Qinzhi Hou, Jing Ren, Lili Wu, Zhibo Yao, Yu Zhou, Ning Wang, Kaili Jiang, Hong Lin, Zhanhu Guo
Adv. Funct. Mater., September 08, 2017, https://doi.org/10.1002/adfm.201703068 Read article

Investigation on the Interface Modification of TiO2 Surfaces by Functional Co-Adsorbents for High-Efficiency Dye-Sensitized Solar Cells

Investigation on the Interface Modification of TiO2 Surfaces by Functional Co‐Adsorbents for High‐Efficiency Dye‐Sensitized Solar Cells

The influence of interface modification of sensitized TiO2 surfaces on photovoltaic performance is investigated using carboxylic, phosphinic, and phosphonic functional groups of co-adsorbents.

[Article]
Aravind Kumar Chandiran, Shaik M. Zakeeruddin, Robin Humphry-Baker, Mohammad Khaja Nazeeruddin, Michael Grätzel, Frédéric Sauvage
ChemPhysChem, September 07, 2017, https://doi.org/10.1002/cphc.201700486 Read article

Efficient Perovskite Solar Cells over a Broad Temperature Window: The Role of the Charge Carrier Extraction

Efficient Perovskite Solar Cells over a Broad Temperature Window: The Role of the Charge Carrier Extraction

The temperature dependence of the figures of merit of hybrid perovskite solar cells (HPSCs) is dominated by the electron extraction layer (EEL). At low temperature, the device using [60]PCBM as EEL shows significant lowering of the performance due to the poor electron transport capability of [60]PCBM. By n-type doping [60]PCBM, highly efficient HPSCs over a broad temperature range are achieved.

[Full Paper]
Shuyan Shao, Jian Liu, Hong-Hua Fang, Li Qiu, Gert H. ten Brink, Jan C. Hummelen, L. Jan Anton Koster, Maria Antonietta Loi
Adv. Energy Mater., September 07, 2017, https://doi.org/10.1002/aenm.201701305 Read article

Solvothermal Synthesis, Gas-Sensing Properties, and Solar Cell-Aided Investigation of TiO2–MoOx Nanocrystals

Solvothermal Synthesis, Gas‐Sensing Properties, and Solar Cell‐Aided Investigation of TiO2–MoOx Nanocrystals

Surface layer sensors: Titania anatase nanocrystals were reacted with different concentrations of Mo chloroalkoxide, aimed to depositing Mo oxide species onto the surface anatase. Greatly enhanced response, for all Mo concentrations, was observed to acetone (two orders of magnitude) and to carbon monoxide with respect to pure TiO2, and the investigation of solar cells prepared with the same material helped establish that the charges generated by reaction with the gaseous analytes were mainly transported through the ultra-thin MoOx surface layer.

[Full Paper]
Mauro Epifani, Saulius Kaciulis, Alessio Mezzi, Davide Altamura, Cinzia Giannini, PengYi Tang, Joan R. Morante, Jordi Arbiol, Pietro Siciliano, Elisabetta Comini, Isabella Concina
ChemNanoMat, September 06, 2017, https://doi.org/10.1002/cnma.201700160 Read article

Morphology of a Ternary Blend Solar Cell Based on Small Molecule:Conjugated Polymer:Fullerene Fabricated by Blade Coating

Morphology of a Ternary Blend Solar Cell Based on Small Molecule:Conjugated Polymer:Fullerene Fabricated by Blade Coating

The crystallization of small molecules and fullerene phase separation in SM-BHJ blends are significantly impacted by the blade coating speed as well as the addition of a third component. The judicious selection of blade coating speed and the addition of a conjugated polymer optimizes the morphology of SM-BHJ, which will provide guidelines for high performance SM-BHJ from roll-to-roll production.

[Full Paper]
Xiaomin Wu, Shuqiong Lan, Guocheng Zhang, Qizhen Chen, Huipeng Chen, Tailiang Guo
Adv. Funct. Mater., September 06, 2017, https://doi.org/10.1002/adfm.201703268 Read article

Nucleation and Crystallization Control via Polyurethane to Enhance the Bendability of Perovskite Solar Cells with Excellent Device Performance

Nucleation and Crystallization Control via Polyurethane to Enhance the Bendability of Perovskite Solar Cells with Excellent Device Performance

Polyurethane (PU) has been used as an effective additive to optimize the performance of perovskite solar cells by retarding crystallization rate and enhancing grain size of perovskite crystals. More importantly, elastomer PU can effectively improve the bendability of perovskite films due to denseness and high elasticity created by crosslinking grain boundaries between neighboring perovskite crystals to form a PU network.

[Full Paper]
Zengqi Huang, Xiaotian Hu, Cong Liu, Licheng Tan, Yiwang Chen
Adv. Funct. Mater., September 05, 2017, https://doi.org/10.1002/adfm.201703061 Read article

Low-Temperature Saw Damage Gettering to Improve Minority Carrier Lifetime in Multicrystalline Silicon

Low‐Temperature Saw Damage Gettering to Improve Minority Carrier Lifetime in Multicrystalline Silicon

The authors demonstrate a novel low-temperature (≤700 °C) process to improve carrier lifetime in multicrystalline silicon for photovoltaics. Surface damage created when ingots are cut into wafers is used as a gettering site for metallic impurities, thus enabling impurities to be easily removed from the wafer subsequently. A factor of >4 lifetime improvement is achieved, highlighting that saw damage gettering could be a low thermal budget process to improve poor quality silicon.

[Rapid Research Letter]
M. Al-Amin, N. E. Grant, J. D. Murphy
Phys. Status Solidi RRL, September 04, 2017, https://doi.org/10.1002/pssr.201700268 Read article

The Importance of Pendant Groups on Triphenylamine-Based Hole Transport Materials for Obtaining Perovskite Solar Cells with over 20% Efficiency

The Importance of Pendant Groups on Triphenylamine‐Based Hole Transport Materials for Obtaining Perovskite Solar Cells with over 20% Efficiency

The importance of the pendant groups on triphenylamine-based hole transport materials (HTMs) in perovskite solar cells is investigated. A new HTM X26 with optimal spiro[fluorene-9,9′-xanthene]-based pendant groups shows an efficiency of over 20%. This work demonstrates that the pendant groups in HTMs play important roles in determining the molecular property, solar cell performance, and stability.

[Communication]
Jinbao Zhang, Bo Xu, Li Yang, Changqing Ruan, Linqin Wang, Peng Liu, Wei Zhang, Nick Vlachopoulos, Lars Kloo, Gerrit Boschloo, Licheng Sun, Anders Hagfeldt, Erik M. J. Johansson
Adv. Energy Mater., September 04, 2017, https://doi.org/10.1002/aenm.201701209 Read article

Side Chain Engineering on Medium Bandgap Copolymers to Suppress Triplet Formation for High-Efficiency Polymer Solar Cells

Side Chain Engineering on Medium Bandgap Copolymers to Suppress Triplet Formation for High‐Efficiency Polymer Solar Cells

Suppression of carrier recombination is critically important for efficient polymer solar cells. Herein, it is demonstrated that difluoro-substitution of thiophene conjugated side chains on the medium bandgap polymer donor can suppress triplet formation for reducing carrier recombination and improving photovoltaic performance.

[Communication]
Lingwei Xue, Yankang Yang, Jianqiu Xu, Chunfeng Zhang, Haijun Bin, Zhi-Guo Zhang, Beibei Qiu, Xiaojun Li, Chenkai Sun, Liang Gao, Jia Yao, Xiaofeng Chen, Yunxu Yang, Min Xiao, Yongfang Li
Adv. Mater., August 31, 2017, https://doi.org/10.1002/adma.201703344 Read article

Interface Engineering of Perovskite Solar Cells with Air Plasma Treatment for Improved Performance

Interface Engineering of Perovskite Solar Cells with Air Plasma Treatment for Improved Performance

Let′s get some air: A mesoporous TiO2 electron-transport layer (ETL) was treated with clean air plasma to improve electron extraction and transport properties at the perovskite/TiO2 interface. This treatment leads to a marked increase in the concentration of Ti3+ and oxygen vacancies on the TiO2 layer surface, which modifies the band alignment at the perovskite/TiO2 interface, leading to a remarkable enhancement in perovskite solar cell efficiencies

[Article]
Xiao Ma, Peng Tang, Dong Liu, Jingquan Zhang, Lianghuan Feng, Lili Wu
ChemPhysChem, August 29, 2017, https://doi.org/10.1002/cphc.201700536 Read article

Low-Dimensional Organic–Inorganic Halide Perovskite: Structure, Properties, and Applications

Low‐Dimensional Organic–Inorganic Halide Perovskite: Structure, Properties, and Applications

Peeling back the layers: The synthesis, properties, and structural orientation of low-dimensional perovskite are surveyed. Controlling the number of perovskite layers can provide a confined structure with chemical and physical properties that are different from those of 3 D perovskite. The use of low-dimensional perovskite in photovoltaic solar cells is discussed, as is its use in light-emitting diodes and photodetectors.

[Minireview]
Ravi K. Misra, Bat-El Cohen, Lior Iagher, Lioz Etgar
ChemSusChem, August 28, 2017, https://doi.org/10.1002/cssc.201701026 Read article

Revealing Minor Electrical Losses in the Interconnecting Layers of Organic Tandem Solar Cells

Revealing Minor Electrical Losses in the Interconnecting Layers of Organic Tandem Solar Cells

To exploit the full potential of organic multijunction solar cells, minor electrical losses affecting the interconnection layer need to be individuated and addressed. The combination of electroluminescence analyses and the photo-generated current density–voltage response of tandem substructures is proven to identify the presence and the specific nature of minor electrical losses exclusively present in the interconnecting layers.

[Communication]
Mario Prosa, Ning Li, Nicola Gasparini, Margherita Bolognesi, Mirko Seri, Michele Muccini, Christoph J. Brabec
Adv. Mater. Interfaces, August 28, 2017, https://doi.org/10.1002/admi.201700776 Read article

Improved Glass Transition Temperature towards Thermal Stability via Thiols Solvent Additive versus DIO in Polymer Solar Cells

Improved Glass Transition Temperature towards Thermal Stability via Thiols Solvent Additive versus DIO in Polymer Solar Cells

The halogen-free solvent additive of 1,4-butanedithiols (BT) can improve power conversion efficiency and substantially enhance thermal stability of PTB7-Th:PC71BM, as compared with the traditional 1,8-diiodooctane additive. More importantly, the improved thermal stability after processing with BT contributes to higher glass transition temperature (Tg) of PTB7-Th, as determined by dynamic mechanical analysis.

[Communication]
Jingping Yin, Weihua Zhou, Lin Zhang, Yuanpeng Xie, Zoukangning Yu, Jun Shao, Wei Ma, Jianrong Zeng, Yiwang Chen
Macromol. Rapid Commun., August 25, 2017, https://doi.org/10.1002/marc.201700428 Read article

Broadband-Emitting 2 D Hybrid Organic–Inorganic Perovskite Based on Cyclohexane-bis(methylamonium) Cation

Broadband‐Emitting 2 D Hybrid Organic–Inorganic Perovskite Based on Cyclohexane‐bis(methylamonium) Cation

Cis or trans? A new 2 D hybrid perovskite ((CyBMA)PbBr4) based on highly flexible cis-1,3-bis(methylaminohydrobromide)cyclohexane (CyBMABr) core presenting a broad emission spanning from 380 to 750 nm is presented here. Its design, synthesis, and photophysical properties are investigated, highlighting the effects of stereoisomerism of the templating cation on the formation and properties of the resulting perovskite.

[Full Paper]
Ishita Neogi, Annalisa Bruno, Damodaran Bahulayan, Teck Wee Goh, Biplab Ghosh, Rakesh Ganguly, Daniele Cortecchia, Tze Chien Sum, Cesare Soci, Nripan Mathews, Subodh Gautam Mhaisalkar
ChemSusChem, August 24, 2017, https://doi.org/10.1002/cssc.201701227 Read article

TiO2 Electron Transport Bilayer for Highly Efficient Planar Perovskite Solar Cell

TiO2 Electron Transport Bilayer for Highly Efficient Planar Perovskite Solar Cell

The TiO2 bilayers with different energy band alignments are fabricated by combing atomic layer deposition and spin-coating technique. Perovskite solar cells based on TiO2 electron transport bilayers are highly efficient in carrier extraction, recombination suppression, and defect passivation, and thus demonstrate champion efficiency up to 16.5%, which is almost 50% enhancement compared to the TiO2 single layer based counterparts.

[Full Paper]
Hao Lu, Wei Tian, Bangkai Gu, Yayun Zhu, Liang Li
Small, August 22, 2017, https://doi.org/10.1002/smll.201701535 Read article

Towards Extending Solar Cell Lifetimes: Addition of a Fluorous Cation to Triple Cation-Based Perovskite Films

Towards Extending Solar Cell Lifetimes: Addition of a Fluorous Cation to Triple Cation‐Based Perovskite Films

The fast and the fluorous: The addition of a fluorous-functionalized imidazolium cation during the preparation of triple cation-based perovskite Cs0.05(MA0.15FA0.85)0.95Pb(I0.85Br0.15)3 has been shown to influence its stability. The resulting materials display prolonged tolerance to atmospheric humidity (>100 days) along with power conversion efficiencies exceeding 16 %.

[Full Paper]
Manuel Salado, M. Asunción Fernández, Juan P. Holgado, Samrana Kazim, Mohammad Khaja Nazeeruddin, Paul J. Dyson, Shahzada Ahmad
ChemSusChem, August 21, 2017, https://doi.org/10.1002/cssc.201700797 Read article

Design of Random and Semi-Random Conjugated Polymers for Organic Solar Cells

Design of Random and Semi‐Random Conjugated Polymers for Organic Solar Cells

Random and semi-random conjugated polymer backbone structures offer various handles for modification of optical, electronic, and physical properties. Organic photovoltaic devices benefit from finely tuned and optimized polymer structures, which impart ideal absorption profiles, energy levels, and miscibility with other components. In this article, random copolymer structures are classified and structure-function relationships are explored.

[Trend]
Jenna B. Howard, Barry C. Thompson
Macromol. Chem. Phys., August 15, 2017, https://doi.org/10.1002/macp.201700255 Read article

Hindered Amine Light Stabilizers Increase the Stability of Methylammonium Lead Iodide Perovskite Against Light and Oxygen

Hindered Amine Light Stabilizers Increase the Stability of Methylammonium Lead Iodide Perovskite Against Light and Oxygen

Hindered reasons: A hindered amine light stabilizer (HALS) exerts a stabilization effect methylammonium lead iodide perovskite (MAPI), a promising material for photovoltaic devices, against photooxidation. The incorporation of HALS in MAPI films significantly extends their resistivity against photodegradation in ambient air, while causing no significant changes in key properties.

[Communication]
Nevena Marinova, Marius Franckevičius, Ieva Matulaitienė, Andrius Devižis, Gediminas Niaura, Vidmantas Gulbinas, Juan Luis Delgado
ChemSusChem, August 10, 2017, https://doi.org/10.1002/cssc.201700707 Read article

Push–Pull Distyryl Boron Dipyrromethenes as Near-Infrared Sensitizers for Dye-Sensitized Solar Cells

Push–Pull Distyryl Boron Dipyrromethenes as Near‐Infrared Sensitizers for Dye‐Sensitized Solar Cells

Catch some rays: A series of push–pull-type distyryl boron dipyrromethenes were synthesized and characterized. Having extended π systems, these compounds serve as sensitizers for dye-sensitized solar cells with photovoltaic conversion efficiencies of up to 2.78 % under AM 1.5G standard sunlight and broad photoresponses over the whole visible range extending to around 950 nm in the near-infrared region.

[Full Paper]
Wen-Jing Shi, Takumi Kinoshita, Dennis K. P. Ng
Asian J. Org. Chem., August 09, 2017, https://doi.org/10.1002/ajoc.201700282 Read article

Molecular Self-Assembly Fabrication and Carrier Dynamics of Stable and Efficient CH3NH3Pb(1−x)SnxI3 Perovskite Solar Cells

Molecular Self‐Assembly Fabrication and Carrier Dynamics of Stable and Efficient CH3NH3Pb(1−x)SnxI3 Perovskite Solar Cells

Toward lead-free: We employ a molecular self-assembly approach to obtain a series CH3NH3Pb(1−x)SnxI3 (0≤x≤1) perovskite with high stability and efficiency. The reasons that limit its further efficiency improvement are provided by means of studying the carrier dynamics in the device.

[Full Paper]
Jiandong Fan, Chong Liu, Hongliang Li, Cuiling Zhang, Wenzhe Li, Yaohua Mai
ChemSusChem, August 04, 2017, https://doi.org/10.1002/cssc.201700880 Read article

Plasmonic Gold Nanostars Incorporated into High-Efficiency Perovskite Solar Cells

Plasmonic Gold Nanostars Incorporated into High‐Efficiency Perovskite Solar Cells

Golden star: Plasmonic gold nanostars are incorporated into mesoporous TiO2 photoelectrodes to fabricate high efficiency perovskite solar cells. A power conversion efficiency of 17.72 % is achieved using TiO2-AuNSs photoelectrode-based device.

[Communication]
Munkhbayar Batmunkh, Thomas J. Macdonald, William J. Peveler, Abdulaziz S. R. Bati, Claire J. Carmalt, Ivan P. Parkin, Joseph G. Shapter
ChemSusChem, August 03, 2017, https://doi.org/10.1002/cssc.201701056 Read article

Low-Cost Perovskite Solar Cells Employing Dimethoxydiphenylamine-Substituted Bistricyclic Aromatic Enes as Hole Transport Materials

Low‐Cost Perovskite Solar Cells Employing Dimethoxydiphenylamine‐Substituted Bistricyclic Aromatic Enes as Hole Transport Materials

Bridge to success: We report the synthesis of three new hole transport materials (HTMs) using a cost-effective procedure and the impact of different atoms in heteromerous bistricyclic aromatic ene scaffolds. S-bridged KR374 shows a a significantly improved hole-drift mobility leading to enhanced photovoltaic performance in mixed-ion perovskite solar cells and reduced hysteresis owing to the improved interface between the perovskite and HTM caused by stronger Pb–S interaction.

[Full Paper]
Kasparas Rakstys, Sanghyun Paek, Giulia Grancini, Peng Gao, Vygintas Jankauskas, Abdullah M. Asiri, Mohammad Khaja Nazeeruddin
ChemSusChem, August 03, 2017, https://doi.org/10.1002/cssc.201700974 Read article

Replacement of Biphenyl by Bipyridine Enabling Powerful Hole Transport Materials for Efficient Perovskite Solar Cells

Replacement of Biphenyl by Bipyridine Enabling Powerful Hole Transport Materials for Efficient Perovskite Solar Cells

Bip, bip: Bipyridine is introduced for the first time as the core structure for new hole transport materials (HTMs). Remarkable power conversion efficiencies of 17.71 and 18.48 % are achieved in conventional planar perovskite (CH3NH3PbI3−xClx) solar cells by using the newly devised HTMs.

[Full Paper]
Fei Wu, Yahan Shan, Jianhui Qiao, Cheng Zhong, Rui Wang, Qunliang Song, Linna Zhu
ChemSusChem, August 02, 2017, https://doi.org/10.1002/cssc.201700973 Read article

Factors Influencing the Mechanical Properties of Formamidinium Lead Halides and Related Hybrid Perovskites

Factors Influencing the Mechanical Properties of Formamidinium Lead Halides and Related Hybrid Perovskites

Hard or soft? Nanoindentation on single crystals of FAPbX3 (X=Br or I) is used to study the mechanical properties of formamidinium lead halide perovskites. The effects of hydrogen bonding are evaluated by ab initio molecular dynamics and calculating radial distribution functions.

[Communication]
Shijing Sun, Furkan H. Isikgor, Zeyu Deng, Fengxia Wei, Gregor Kieslich, Paul D. Bristowe, Jianyong Ouyang, Anthony K. Cheetham
ChemSusChem, July 26, 2017, https://doi.org/10.1002/cssc.201700991 Read article

Photovoltaic Rudorffites: Lead-Free Silver Bismuth Halides Alternative to Hybrid Lead Halide Perovskites

Photovoltaic Rudorffites: Lead‐Free Silver Bismuth Halides Alternative to Hybrid Lead Halide Perovskites

Move over perovskite: Optoelectronic properties of several highly stable silver iodobismuthates with rudorffite structure reveal them as alternative nontoxic and solution-processable photovoltaic materials that feature direct band gaps of around 1.8 eV. The proof-of-concept solar cell with FTO/c-m-TiO2/Ag3BiI6/PTAA/Au (c: compact; m: mesoporous; PTAA: poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine]) architecture shows a promising power conversion efficiency of 4.3 %.

[Communication]
Ivan Turkevych, Said Kazaoui, Eisuke Ito, Toshiyuki Urano, Koji Yamada, Hiroshi Tomiyasu, Hideo Yamagishi, Michio Kondo, Shinji Aramaki
ChemSusChem, July 06, 2017, https://doi.org/10.1002/cssc.201700980 Read article

High-Efficiency Perovskite Solar Cell Based on Poly(3-Hexylthiophene): Influence of Molecular Weight and Mesoscopic Scaffold Layer

High‐Efficiency Perovskite Solar Cell Based on Poly(3‐Hexylthiophene): Influence of Molecular Weight and Mesoscopic Scaffold Layer

Molecular weight matters! High efficiency perovskite solar cells fabricated in ambient conditions by controlling of mesoporous (mp)-TiO2 thickness and investigation of poly(3-hexylthiophene) (P3HT) molecular weight (MW) as hole-transport layer. The best efficiencies are achieved for a MW of 124 kDa and for a thickness of mp-TiO2 of 500 nm. Efficiency enhancement is mainly related to the increase of Jsc and FF as P3HT MW increases.

[Full Paper]
Narges Yaghoobi Nia, Fabio Matteocci, Lucio Cina, Aldo Di Carlo
ChemSusChem, June 14, 2017, https://doi.org/10.1002/cssc.201700635 Read article

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