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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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Dual Functional Electron-Selective Contacts Based on Silicon Oxide/Magnesium: Tailoring Heterointerface Band Structures while Maintaining Surface Passivation

Dual Functional Electron‐Selective Contacts Based on Silicon Oxide/Magnesium: Tailoring Heterointerface Band Structures while Maintaining Surface Passivation

A high-performance dopant-free and electron-selective contact (ESC) design of silicon oxide/magnesium (SiOx/Mg) is first demonstrated and explored with the potential to tailor heterointerface band structures while maintaining surface passivation. A solar cell with efficiency of 15% is provisionally demonstrated via totally dopant-free processing and a pathway toward a competitive efficiency with conventionally diffused pn junction solar cells is sequentially indicated.

[Full Paper]
Hui Tong, Zhenhai Yang, Xixi Wang, Zhaolang Liu, Zhenxin Chen, Xiaoxing Ke, Manling Sui, Jiang Tang, Tianbao Yu, Ziyi Ge, Yuheng Zeng, Pingqi Gao, Jichun Ye
Adv. Energy Mater., February 21, 2018, https://doi.org/10.1002/aenm.201702921 Read article

Effects of Voltage Biasing on Current Extraction in Perovskite Solar Cells

Effects of Voltage Biasing on Current Extraction in Perovskite Solar Cells

Electron-beam induced current measurements are used to map local current extraction in organic–inorganic perovskite solar cells. Current extraction before and after prebiasing of organic–inorganic perovskite solar cell devices and quantification of corresponding current decay rates support a model of mixed ionic and electronic processes contributing to the dependence of perovskite solar cells on previous biasing conditions.

[Full Paper]
Olivia Hentz, Paul Rekemeyer, Silvija Gradečak
Adv. Energy Mater., February 21, 2018, https://doi.org/10.1002/aenm.201701378 Read article

Exploring the Effect of Introducing a π-Bridge on The Efficiency of a Perylene-Brazilein Based D-D-π-A System: A Theoretical Perspective

Exploring the Effect of Introducing a π‐Bridge on The Efficiency of a Perylene‐Brazilein Based D‐D‐π‐A System: A Theoretical Perspective

Various Perylene-Brazilein based push pull systems were theoretically explored. The effect of introducing a π-bridge between the two donors (Perylene and Brazilein) as well as the changing of the same is found to greatly effect the optical as well as photovoltaic response of the dye molecules. Moreover, the dye molecules show good interaction with the TiO2 surface and are hence, expected to be efficient sensitizers for such semiconductors.

[Full Paper]
Taniya Manzoor, Altaf Hussain Pandith
ChemistrySelect, February 20, 2018, https://doi.org/10.1002/slct.201703059 Read article

Strategic Synthesis of Ultrasmall NiCo2O4 NPs as Hole Transport Layer for Highly Efficient Perovskite Solar Cells

Strategic Synthesis of Ultrasmall NiCo2O4 NPs as Hole Transport Layer for Highly Efficient Perovskite Solar Cells

An ultrasmall and well-dispersed ternary oxide of NiCo2O4 nanoparticles, achieved by a new strategy of controllable deamination of the Co–NH3 complexes in a system containing Ni(OH)2 , facilitate the formation of large perovskite grains, which is first applied as hole transport layer for highly efficient perovskite solar cells.

[Full Paper]
Dan Ouyang, Junyan Xiao, Fei Ye, Zhanfeng Huang, Hong Zhang, Lu Zhu, Jiaqi Cheng, Wallace C. H. Choy
Adv. Energy Mater., February 20, 2018, https://doi.org/10.1002/aenm.201702722 Read article

Nonhalogen Solvent-Processed Asymmetric Wide-Bandgap Polymers for Nonfullerene Organic Solar Cells with Over 10% Efficiency

Nonhalogen Solvent‐Processed Asymmetric Wide‐Bandgap Polymers for Nonfullerene Organic Solar Cells with Over 10% Efficiency

New wide-bandgap D–A–π copolymers based on an asymmetric bithiophene with one carboxylate substituent were synthesized. The asymmetric structure unit is flexible and versatile, which allows the absorption, energy levels and morphology of the blend films to be adjusted easily. D-A-p copolymers produced a high power conversion efficiency of 10.0% for halogen solvent-processed OSCs and 9.55% for non-halogen solvent-processed devices.

[Full Paper]
Yongkang An, Xunfan Liao, Lie Chen, Jingping Yin, Qingyun Ai, Qian Xie, Bin Huang, Feng Liu, Alex K.-Y. Jen, Yiwang Chen
Adv. Funct. Mater., February 20, 2018, https://doi.org/10.1002/adfm.201706517 Read article

9,9′-Bifluorenylidene-Core Perylene Diimide Acceptors for As-Cast Non-Fullerene Organic Solar Cells: The Isomeric Effect on Optoelectronic Properties

9,9′‐Bifluorenylidene‐Core Perylene Diimide Acceptors for As‐Cast Non‐Fullerene Organic Solar Cells: The Isomeric Effect on Optoelectronic Properties

Core configuration: Isomeric effect on the optoelectronic properties of two small-molecule non-fullerene acceptors based on bifluorenylidene and perylene diimide were investigated. Organic solar cells based on these materials achieved the highest power conversion efficiency of 5.95 % without any treatments (see figure).

[Full Paper]
Yuan Zhao, Huan Wang, Shengpeng Xia, Feng Zhou, Zhenghui Luo, Jiajia Luo, Feng He, Chuluo Yang
Chem. Eur. J., February 19, 2018, https://doi.org/10.1002/chem.201705480 Read article

Device Characteristics of an 11.4% CZTSe Solar Cell Fabricated from Sputtered Precursors

Device Characteristics of an 11.4% CZTSe Solar Cell Fabricated from Sputtered Precursors

Optoelectronic properties of an 11.4% Cu2ZnSnSe4 solar cell are presented. The device shows an unusual behavior for kesterite: (i) photon energy of the photoluminescence emission and (ii) the extrapolated Voc for 0 K are both matching the band gap region of the absorber. These properties lead to one of the lowest Voc deficits for kesterite in the literature.

[Communication]
Teoman Taskesen, Janet Neerken, Johannes Schoneberg, Devendra Pareek, Vincent Steininger, Jürgen Parisi, Levent Gütay
Adv. Energy Mater., February 19, 2018, https://doi.org/10.1002/aenm.201703295 Read article

Advances in Carbon Nanotube–Silicon Heterojunction Solar Cells

Advances in Carbon Nanotube–Silicon Heterojunction Solar Cells

The significant progress that has been made in improving the performance and stability of carbon nanotube–silicon heterojunction solar cells, and in understanding of the operating principles, is discussed. In addition, a comprehensive review of the literature, a roadmap for future performance improvement, and a critical assessment of the opportunities for this rapidly developing field in the wider context of the silicon photovoltaics industry are provided.

[Review]
Daniel D. Tune, Benjamin S. Flavel
Adv. Energy Mater., February 19, 2018, https://doi.org/10.1002/aenm.201703241 Read article

Molecular Engineering Using an Anthanthrone Dye for Low-Cost Hole Transport Materials: A Strategy for Dopant-Free, High-Efficiency, and Stable Perovskite Solar Cells

Molecular Engineering Using an Anthanthrone Dye for Low‐Cost Hole Transport Materials: A Strategy for Dopant‐Free, High‐Efficiency, and Stable Perovskite Solar Cells

First time low-cost anthanthrone dye based hole transporting materials (HTMs) 4,10-bis(1,2-dihydroacenaphthylen-5-yl)-6,12-bis(octyloxy)-6,12-dihydronaphtho[7,8,1,2,3-nopqr]tetraphene (ACE-ANT-ACE) and 4,4′-(6,12-bis(octyloxy)-6,12-dihydronaphtho[7,8,1,2,3-nopqr]tetraphene-4,10-diyl)bis(N,N-bis(4-methoxyphenyl)aniline) (TPA-ANT-TPA) end capped with dihydroacenaphthylene and triphenyleamine groups are designed and synthesized, respectively. Among both, dopant-free TPA-ANT-TPA cut-rate HTM ($67 g−1) exhibits higher performance with 17.5% efficiency and retains respectable performance after 50 h in 58% relative humidity than conventional expensive 2,2′,7,7′-tetrakis(N,N′-di-p-methoxyphenylamino)-9,9′-spirbiuorene.

[Communication]
Hong Duc Pham, Thu Trang Do, Jinhyun Kim, Cecile Charbonneau, Sergei Manzhos, Krishna Feron, Wing Chung Tsoi, James R. Durrant, Sagar M. Jain, Prashant Sonar
Adv. Energy Mater., February 19, 2018, https://doi.org/10.1002/aenm.201703007 Read article

Light-Induced Reversible Control of Ferroelectric Polarization in BiFeO3

Light‐Induced Reversible Control of Ferroelectric Polarization in BiFeO3

Full optical control of ferroelectric order parameters at room temperature is demonstrated by a combination of the bulk photovoltaic effect and the tip of an atomic force microscope. The ferroelectric polarization of a BiFeO3 thin film can be reversibly switched solely by light via changing illumination areas or simply rotating the light polarization angles.

[Communication]
Ming-Min Yang, Marin Alexe
Adv. Mater., February 19, 2018, https://doi.org/10.1002/adma.201704908 Read article

The Effect of Dopant-Free Hole-Transport Polymers on Charge Generation and Recombination in Cesium–Bismuth–Iodide Solar Cells

The Effect of Dopant‐Free Hole‐Transport Polymers on Charge Generation and Recombination in Cesium–Bismuth–Iodide Solar Cells

Compare to win: In CsBi3I10-based solar cells, three different conducting polymers are compared as dopant-free hole-transport layers. Poly[[2,3-bis(3-octyloxyphenyl)-5,8-quinoxalinediyl]-2,5-thiophenediyl] (TQ1) results in the most efficient devices, and the photon-to-current conversion spectrum indicates that light absorption from the polymer also contributes to the photocurrent. A CsBi3I10 recrystallization procedure further increases the performance of the devices.

[Full Paper]
Huimin Zhu, Malin B. Johansson, Erik M. J. Johansson
ChemSusChem, February 16, 2018, https://doi.org/10.1002/cssc.201702169 Read article

Biodegradable Monocrystalline Silicon Photovoltaic Microcells as Power Supplies for Transient Biomedical Implants

Biodegradable Monocrystalline Silicon Photovoltaic Microcells as Power Supplies for Transient Biomedical Implants

A fully biodegradable silicon photovoltaic (PV) system is designed for powering in vivo electronic implants. Operation of a light-emitting diode with a subdermal implanted PV system provides a proof-of-concept demonstration. The PV system fully dissolves after 4 months in animal models. Both in vitro and in vivo studies indicate good biocompatibility of the PV system and its dissolution by-products.

[Communication]
Luyao Lu, Zijian Yang, Kathleen Meacham, Caroline Cvetkovic, Elise A. Corbin, Abraham Vázquez-Guardado, Mantian Xue, Lan Yin, Javaneh Boroumand, Grace Pakeltis, Tian Sang, Ki Jun Yu, Debashis Chanda, Rashid Bashir, Robert W. Gereau, Xing Sheng, John A. Rogers
Adv. Energy Mater., February 16, 2018, https://doi.org/10.1002/aenm.201703035 Read article

Amide-Catalyzed Phase-Selective Crystallization Reduces Defect Density in Wide-Bandgap Perovskites

Amide‐Catalyzed Phase‐Selective Crystallization Reduces Defect Density in Wide‐Bandgap Perovskites

The highly polar solvent additive, formamide, enables phase-selective crystallization in wide-bandgap (WBG) perovskites. By suppressing the formation of non-perovskite phases, the WBG perovskites (Eg ≈ 1.75 eV) exhibited excellent light-induced phase-, thermal, and air stability, as well as device performance with a high Voc of 1.23 V and reduced hysteresis, with a power conversion efficiency (PCE) of 17.8%.

[Communication]
Junghwan Kim, Makhsud I. Saidaminov, Hairen Tan, Yicheng Zhao, Younghoon Kim, Jongmin Choi, Jea Woong Jo, James Fan, Rafael Quintero-Bermudez, Zhenyu Yang, Li Na Quan, Mingyang Wei, Oleksandr Voznyy, Edward H. Sargent
Adv. Mater., February 14, 2018, https://doi.org/10.1002/adma.201706275 Read article

Self-Assembled Quasi-3D Nanocomposite: A Novel p-Type Hole Transport Layer for High Performance Inverted Organic Solar Cells

Self‐Assembled Quasi‐3D Nanocomposite: A Novel p‐Type Hole Transport Layer for High Performance Inverted Organic Solar Cells

A novel self-assembled quasi-3D nanocomposite is demonstrated to be an effective top hole transport layer (HTL) for both fullerene and non-fullerene inverted organic solar cells. Due to the better conductivity of this nanocomposite HTL, the thickness sensitivity issue of graphene oxide is addressed. Surface recombination is suppressed and the highest power conversion efficiency can reach 12.13%.

[Full Paper]
Jiaqi Cheng, Hong Zhang, Yong Zhao, Jian Mao, Can Li, Shaoqing Zhang, Kam Sing Wong, Jianhui Hou, Wallace C. H. Choy
Adv. Funct. Mater., February 14, 2018, https://doi.org/10.1002/adfm.201706403 Read article

Improving Photovoltaic Performance of a Fused-Ring Azepinedione Copolymer via a D–A–A Design

Improving Photovoltaic Performance of a Fused‐Ring Azepinedione Copolymer via a D–A–A Design

A D–A–A copolymer donor (PBTTABDT) based on a fused-ring azepinedione acceptor unit is developed. Compared with D–A counterpart PTTABDT, PBTTABDT possesses a deeper highest occupied molecular orbital (HOMO) level, a narrower bandgap, and a higher hole mobility. PBTTABDT:PC71BM solar cells give a power conversion efficiency of 7.81%.

[Communication]
Honghong Zhang, Ting Li, Zuo Xiao, Zhongli Lei, Liming Ding
Macromol. Rapid Commun., February 13, 2018, https://doi.org/10.1002/marc.201700882 Read article

Fusing Benzo[c][1,2,5]oxadiazole Unit with Thiophene for Constructing Wide-bandgap High-performance IDT-based Polymer Solar Cell Donor Material

Fusing Benzo[c][1,2,5]oxadiazole Unit with Thiophene for Constructing Wide‐bandgap High‐performance IDT‐based Polymer Solar Cell Donor Material

Wide-band-gap polymers based on benzooxadiazole and thiophene fused units (PIDT-BO and PIDT-BOT) are designed and synthesized. PIDT-BOT shows high solar cell performance, with PCE up to 6.08%.

[Communication]
Xin Song, Meijie Fan, Kaili Zhang, Dakang Ding, Weiye Chen, Yonghai Li, Liangmin Yu, Mingliang Sun, Renqiang Yang
Macromol. Rapid Commun., February 13, 2018, https://doi.org/10.1002/marc.201700782 Read article

Asymmetric Alkyl Side-Chain Engineering of Naphthalene Diimide-Based n-Type Polymers for Efficient All-Polymer Solar Cells

Asymmetric Alkyl Side‐Chain Engineering of Naphthalene Diimide‐Based n‐Type Polymers for Efficient All‐Polymer Solar Cells

Three n-type conjugated polymers based on a naphthalene diimide–thiophene skeleton and different alkyl side chains are designed and synthesized. Polymer solar cells based on the copolymer PNDI-BOOD with different side chains exhibit an improved power-conversion efficiency of 6.89%, which can be attributed to the improved charge-carrier mobility and the formation of favorable film morphology.

[Communication]
Tao Jia, Zhenye Li, Lei Ying, Jianchao Jia, Baobing Fan, Wenkai Zhong, Feilong Pan, Penghui He, Junwu Chen, Fei Huang, Yong Cao
Macromol. Rapid Commun., February 13, 2018, https://doi.org/10.1002/marc.201700765 Read article

High-Performance Thick-Film All-Polymer Solar Cells Created Via Ternary Blending of a Novel Wide-Bandgap Electron-Donating Copolymer

High‐Performance Thick‐Film All‐Polymer Solar Cells Created Via Ternary Blending of a Novel Wide‐Bandgap Electron‐Donating Copolymer

A novel electron-donating copolymer, PBTA-Si, containing a benzotriazole building block with a siloxane-functionalized side chain, is developed and used to fabricate thick-film all-polymer solar cells (all-PSC). By means of ternary blending, the all-PSCs attain a power conversion efficiency of 9.17% with a 350 nm thick active layer and 8.34% with a thickness of 420 nm.

[Full Paper]
Baobing Fan, Peng Zhu, Jingming Xin, Ning Li, Lei Ying, Wenkai Zhong, Zhenye Li, Wei Ma, Fei Huang, Yong Cao
Adv. Energy Mater., February 13, 2018, https://doi.org/10.1002/aenm.201703085 Read article

Improving the Performance and Stability of Inverted Planar Flexible Perovskite Solar Cells Employing a Novel NDI-Based Polymer as the Electron Transport Layer

Improving the Performance and Stability of Inverted Planar Flexible Perovskite Solar Cells Employing a Novel NDI‐Based Polymer as the Electron Transport Layer

A novel naphthalene diimide (NDI)-based polymer (P(NDI2DT-TTCN)) is used as the electron transport layer in inverted flexible perovskite solar cells. Photovoltaic performances of the P(NDI2DT-TTCN)-based device show a significant improvement up to 17.0%, whereas the control device for [6,6]-phenyl-C61-butyric acid methyl ester based device only shows power conversion efficiency of 14.3%. In addition, P(NDI2DT-TTCN) improves not only the light-induced and long-term stability but also mechanical stability.

[Full Paper]
Hong Il Kim, Myeong-Jong Kim, Kyoungwon Choi, Chaesung Lim, Yun-Hi Kim, Soon-Ki Kwon, Taiho Park
Adv. Energy Mater., February 13, 2018, https://doi.org/10.1002/aenm.201702872 Read article

Device Physics of Hybrid Perovskite Solar cells: Theory and Experiment

Device Physics of Hybrid Perovskite Solar cells: Theory and Experiment

A survey of recent advances both in device simulation and optoelectronic and photovoltaic responses is provided, with the aim of comprehensively covering recent progress. The outcomes of several transient techniques are summarized, along with the discussion of impedance and capacitive responses upon variation of bias voltage and irradiance level. The J–V curve hysteresis effect is also discussed.

[Review]
Pilar Lopez-Varo, Juan A. Jiménez-Tejada, Manuel García-Rosell, Sandheep Ravishankar, Germà Garcia-Belmonte, Juan Bisquert, Osbel Almora
Adv. Energy Mater., February 13, 2018, https://doi.org/10.1002/aenm.201702772 Read article

In Situ Growth of 2D Perovskite Capping Layer for Stable and Efficient Perovskite Solar Cells

In Situ Growth of 2D Perovskite Capping Layer for Stable and Efficient Perovskite Solar Cells

2D perovskite capping layers are grown in situ on top of the 3D perovskite film, leading to an enhanced efficiency of 18.5% in the stacking-layered 2D-3D perovskite solar cells (PSCs). Moreover, the unencapsulated 2D-3D PSCs show drastically improved long-term stability, retaining nearly 90% of the original efficiency after 1000 h exposure in a highly humid environment.

[Full Paper]
Peng Chen, Yang Bai, Songcan Wang, Miaoqiang Lyu, Jung-Ho Yun, Lianzhou Wang
Adv. Funct. Mater., February 13, 2018, https://doi.org/10.1002/adfm.201706923 Read article

Highly Efficient Tandem Organic Solar Cell Enabled by Environmentally Friendly Solvent Processed Polymeric Interconnecting Layer

Highly Efficient Tandem Organic Solar Cell Enabled by Environmentally Friendly Solvent Processed Polymeric Interconnecting Layer

A new polymeric interconnecting layer (ICL) based on poly[(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-5,5′-bis(2,2′-thiophene)-2,6-naphthalene-1,4,5,8-tetracaboxylic-N,N′-di(2-ethylhexyl)imide]: poly(ethyleneimine)/PEDOT:PSS is developed and applied for the fabrication of high performance tandem organic solar cells (OSCs). Tandem OSCs employing this ICL achieve a high power conversion efficiency of 12.6% with ICL thickness of 60 nm and even reach to 11.3% with ICL thickness of 140 nm.

[Communication]
Kai Zhang, Baobing Fan, Ruoxi Xia, Xiang Liu, Zhicheng Hu, Honggang Gu, Shiyuan Liu, Hin-Lap Yip, Lei Ying, Fei Huang, Yong Cao
Adv. Energy Mater., February 12, 2018, https://doi.org/10.1002/aenm.201703180 Read article

Highly Efficient and Stable Flexible Perovskite Solar Cells with Metal Oxides Nanoparticle Charge Extraction Layers

Highly Efficient and Stable Flexible Perovskite Solar Cells with Metal Oxides Nanoparticle Charge Extraction Layers

Efficient and durable flexible inverted perovskite solar cells are fabricated using presynthesized, solution processable metal oxides nanoparticle films. The results represent a breakthrough in upscaling both rigid and flexible perovskite photovoltaic devices as the presented stack is compatible with industrial sheet-to-sheet and roll-to-roll production methods.

[Full Paper]
Mehrdad Najafi, Francesco Di Giacomo, Dong Zhang, Santhosh Shanmugam, Alessia Senes, Wiljan Verhees, Afshin Hadipour, Yulia Galagan, Tom Aernouts, Sjoerd Veenstra, Ronn Andriessen
Small, February 09, 2018, https://doi.org/10.1002/smll.201702775 Read article

Oxazolium Iodide Modified Perovskites for Solar Cell Fabrication

Oxazolium Iodide Modified Perovskites for Solar Cell Fabrication

A new brand of sunscreen: Methyl ammonium lead triiodide (MAPbI3) perovskites were doped with 2-phenyl-3-methyloxazolium iodide (2Ph-ox) and used to fabricate solar cells. The oxazolium cations are thought to protect the perovskite layers from UV exposure, since they down-convert absorbed photons, which are re-emitted at a different wavelength.

[Full Paper]
Manuel Salado, Erfan Shirzadi, Samrana Kazim, Zhaofu Fei, Mohammad Khaja Nazeeruddin, Paul J. Dyson, Shahzada Ahmad
ChemPlusChem, February 09, 2018, https://doi.org/10.1002/cplu.201700471 Read article

Polymer Solar Cells with 90% External Quantum Efficiency Featuring an Ideal Light- and Charge-Manipulation Layer

Polymer Solar Cells with 90% External Quantum Efficiency Featuring an Ideal Light‐ and Charge‐Manipulation Layer

Highly efficient polymer solar cells based on nanopatterned ZnO:Al2O3 composite film achieve a peak external quantum efficiency up to 90% and a certified power conversion efficiency of 13.03%. Optical and electrical studies demonstrate enhanced light harvesting due to passivation- and dipole-induced suppression of charge recombination loss and broadband absorption enhancement.

[Communication]
Jing-De Chen, Yan-Qing Li, Jingshuai Zhu, Qianqian Zhang, Rui-Peng Xu, Chi Li, Yue-Xing Zhang, Jing-Sheng Huang, Xiaowei Zhan, Wei You, Jian-Xin Tang
Adv. Mater., February 09, 2018, https://doi.org/10.1002/adma.201706083 Read article

On the True Band Gap of the (CH3NH3)2Pb(SCN)2I2 Hybrid Perovskite: An Interesting Solar-Cell Material

On the True Band Gap of the (CH3NH3)2Pb(SCN)2I2 Hybrid Perovskite: An Interesting Solar‐Cell Material

An appealing solar cell material (CH3NH3)2Pb(SCN)2I2, MAPSI, is a semiconductor with 2D-layered structure and nearly direct band gap, showing unique electronic properties arising from the SCN ion incorporation. For this material, both experimental measurements (diffuse reflectance, XRD) and DFT-based calculations (band structure, density of states) confirm a wide band gap value, which is against previous reports.

[Rapid Research Letter]
Josue I. Clavijo Penagos, Eduard R. Romero, Gerardo Gordillo, John M. Correa Hoyos, Miguel Á. Reinoso Sánchez
Phys. Status Solidi RRL, February 06, 2018, https://doi.org/10.1002/pssr.201700376 Read article

Post-Treatment-Free Main Chain Donor and Side Chain Acceptor (D-s-A) Copolymer for Efficient Nonfullerene Solar Cells with a Small Voltage Loss

Post‐Treatment‐Free Main Chain Donor and Side Chain Acceptor (D‐s‐A) Copolymer for Efficient Nonfullerene Solar Cells with a Small Voltage Loss

Main chain donor and side chain acceptor (D-s-A) copolymers bearing 2-(1,1-dicyanomethylene) rhodanine pendant group, a newly developed D-s-A copolymer PDRCNBDT as a donor material, deliver a record power conversion efficiency of 5.3% with a low energy loss of 0.57 eV for nonfullerene solar cells. This is the best value reported for D-s-A copolymers to date.

[Communication]
Zhihui Liao, Yilin Wang, Yongkang An, Yun Tan, Xiangchuang Meng, Feiyan Wu, Lie Chen, Yiwang Chen
Macromol. Rapid Commun., February 05, 2018, https://doi.org/10.1002/marc.201700706 Read article

Synthesis and Characterization of Isoindigo-Based Polymers with Thermocleavable Side Chains

Synthesis and Characterization of Isoindigo‐Based Polymers with Thermocleavable Side Chains

A series of donor–acceptor random copolymers bearing thermocleavable side chains is synthesized and characterized. The isoindigo-based polymers undergo a one-step thermal degradation corresponding to cleavage of the side chains below 200 °C. The effect on thermal stability in blend films with PC61BM is investigated using transmission electron microscopy and significant stabilization of the morphology is found.

[Full Paper]
Kim Bini, Xiaofeng Xu, Mats R. Andersson, Ergang Wang
Macromol. Chem. Phys., February 05, 2018, https://doi.org/10.1002/macp.201700538 Read article

Poly(ethylene glycol)–[60]Fullerene-Based Materials for Perovskite Solar Cells with Improved Moisture Resistance and Reduced Hysteresis

Poly(ethylene glycol)–[60]Fullerene‐Based Materials for Perovskite Solar Cells with Improved Moisture Resistance and Reduced Hysteresis

Solar cells off the PEG: A series of [60]fullerenes covalently functionalized with poly(ethylene glycol) is presented. These materials have been incorporated as additives in CH3NH3PbI3, which is the most common hybrid perovskite used in solar cells. The extensive photovoltaic study performed with these materials indicates beneficial effects including reduced hysteresis and increased stability against moisture.

[Full Paper]
Silvia Collavini, Michael Saliba, Wolfgang R. Tress, Philippe J. Holzhey, Sebastian F. Völker, Konrad Domanski, Silver H. Turren-Cruz, Amita Ummadisingu, Shaik M. Zakeeruddin, Anders Hagfeldt, Michael Grätzel, Juan L. Delgado
ChemSusChem, February 05, 2018, https://doi.org/10.1002/cssc.201702265 Read article

Increasing the Efficiency of Organic Dye-Sensitized Solar Cells over 10.3% Using Locally Ordered Inverse Opal Nanostructures in the Photoelectrode

Increasing the Efficiency of Organic Dye‐Sensitized Solar Cells over 10.3% Using Locally Ordered Inverse Opal Nanostructures in the Photoelectrode

A significant improvement of the photocurrent density and hence the power conversion efficiency of dye-sensitized solar cells (DSSCs) is achieved by integrating mesoporous 3D inverse opal TiO2 nanostructures into the photoelectrode. Using an organic dye for sensitization leads to efficiencies up to 10.35%, which is the highest value reported using inverse opal structures as photoactive component in the photoelectrode.

[Full Paper]
Lin Xu, Cyril Aumaitre, Yann Kervella, Gérard Lapertot, Cristina Rodríguez-Seco, Emilio Palomares, Renaud Demadrille, Peter Reiss
Adv. Funct. Mater., February 05, 2018, https://doi.org/10.1002/adfm.201706291 Read article

Miscibility–Function Relations in Organic Solar Cells: Significance of Optimal Miscibility in Relation to Percolation

Miscibility–Function Relations in Organic Solar Cells: Significance of Optimal Miscibility in Relation to Percolation

The significance of miscibility and its temperature dependence in controlling morphology, performance, and stability of polymer:fullerene solar cells is discussed. Highly variable miscibility is observed for a wide range of systems and can be converted to temperature-dependent effective Flory–Huggins interaction parameter (χ). There is an optimum miscibility near the fullerene percolation threshold for the most efficient and stable solar cells.

[Progress Report]
Long Ye, Brian A. Collins, Xuechen Jiao, Jingbo Zhao, He Yan, Harald Ade
Adv. Energy Mater., January 31, 2018, https://doi.org/10.1002/aenm.201703058 Read article

A Halogenation Strategy for over 12% Efficiency Nonfullerene Organic Solar Cells

A Halogenation Strategy for over 12% Efficiency Nonfullerene Organic Solar Cells

Through a halogenation strategy onto the end-capping group in the FDICTF-based small-molecule acceptor, red-shifted absorptions, increased crystallinities, and higher charge mobilities are achieved. The device based on F–Br with power conversion efficiency of 12.05% and remarkable FF of 76% is one of only a few organic solar cells with efficiencies over 12% reported to date.

[Communication]
Yanbo Wang, Yamin Zhang, Nailiang Qiu, Huanran Feng, Huanhuan Gao, Bin Kan, Yanfeng Ma, Chenxi Li, Xiangjian Wan, Yongsheng Chen
Adv. Energy Mater., January 30, 2018, https://doi.org/10.1002/aenm.201702870 Read article

A Simple but Efficient Small Molecule with a High Open Circuit Voltage of 1.07 V in Solution-Processable Organic Solar Cells

A Simple but Efficient Small Molecule with a High Open Circuit Voltage of 1.07 V in Solution‐Processable Organic Solar Cells

Small but powerful: A simple but efficient small molecule for solution-processable organic solar cells was designed and synthesized. It exhibited a very low HOMO energy level (−5.47 eV) but good absorption in the range of 300–700 nm. Based on PC71BM as acceptor, it obtained a good PCE of 7.4 % with a very high Voc of 1.07 V. The Voc is one of the highest values reported so far.

[Communication]
Dan Deng, Yajie Zhang, Zaiyu Wang, Qiong Wu, Wei Ma, Kun Lu, Zhixiang Wei
Asian J. Org. Chem., January 29, 2018, https://doi.org/10.1002/ajoc.201700633 Read article

N-Annulated Perylene-Based Hole Transporters for Perovskite Solar Cells: The Significant Influence of Lateral Substituents

N‐Annulated Perylene‐Based Hole Transporters for Perovskite Solar Cells: The Significant Influence of Lateral Substituents

It's only lateral: Two N-annulated perylene-based hole transporters were reported for perovskite solar cells. In comparison to the bulky 2-hexyldecyl, the methoxyphenyl lateral substituent can induce stronger intermolecular π–π stacking and better connectivity of the intermolecular aggregate domains in the solid films, leading to improved hole mobility and power conversion efficiency of the perovskite solar cells.

[Full Paper]
Yang Li, Rui Zhu, Junting Wang, Ze-Sheng Li, Niansheng Xu, Jidong Zhang, Peng Wang
ChemSusChem, January 26, 2018, https://doi.org/10.1002/cssc.201702379 Read article

Elucidating the Impact of Chalcogen Content on the Photovoltaic Properties of Oxychalcogenide Perovkskites: NaMO3−xQx (M=Nb, Ta; Q=S, Se, Te)

Elucidating the Impact of Chalcogen Content on the Photovoltaic Properties of Oxychalcogenide Perovkskites: NaMO3−xQx (M=Nb, Ta; Q=S, Se, Te)

Make the swap: Chalcogen atoms (S, Se, Te) can replace selected oxygen atoms in oxychalcogenide perovkskite structures. The presence and the percentage of chalcogen atoms may affect the electronic structure of the perovskite and reduce the band gap to within the range of visible light. The structures are studied by using DFT and quasi-particle perturbation theory.

[Article]
Heesoo Park, Fahhad H Alharbi, Stefano Sanvito, Nouar Tabet, Fedwa El-Mellouhi
ChemPhysChem, January 26, 2018, https://doi.org/10.1002/cphc.201701206 Read article

Synergistic Hematite-Fullerene Electron-Extracting Layers for Improved Efficiency and Stability in Perovskite Solar Cells

Synergistic Hematite‐Fullerene Electron‐Extracting Layers for Improved Efficiency and Stability in Perovskite Solar Cells

Crystal clear: Simultaneously retarding charge recombination and enhancing the stability of a planar perovskite solar cell is demonstrated, employing phenyl-C61-butyric acid methyl ester (PCBM) and α-Fe2O3 as synergistic electron transport layers. The introduction of fullerene not only improves the crystallinity of the CH3NH3PbI3 perovskite, but it also facilitates electron extraction. The perovskite solar cell fabricated with α-Fe2O3/PCBM shows an initial 14.2 % efficiency and retains over 95 % of the initial value after 45 days of storage in humid air.

[Communication]
Qinzhi Hou, Jing Ren, Haijun Chen, Pan Yang, Qian Shao, Min Zhao, Xiaochong Zhao, Hongcai He, Ning Wang, Qiang Luo, Zhanhu Guo
ChemElectroChem, January 25, 2018, https://doi.org/10.1002/celc.201701054 Read article

Cathode and Anode Interlayers Based on Polymer Carbon Dots via Work Function Regulation for Efficient Polymer Solar Cells

Cathode and Anode Interlayers Based on Polymer Carbon Dots via Work Function Regulation for Efficient Polymer Solar Cells

Through regulating surface groups with more electron-donating amino or electron-withdrawing carboxy, polymer carbon dots can decrease or increase work function of substrates, respectively. Their ability of tuning work function is systematically studied for the first time, and the application of both electrode interlayers in solar cells is achieved.

[Full Paper]
Tianjiao Ji, Biao Guo, Fangyuan Liu, Qingsen Zeng, Chengzhuo Yu, Xiaohang Du, Gan Jin, Tanglue Feng, Shoujun Zhu, Fenghong Li, Bai Yang
Adv. Mater. Interfaces, January 22, 2018, https://doi.org/10.1002/admi.201701519 Read article

Synthesis, Properties, and Solar Cell Performance of Poly(4-(p-alkoxystyryl)thiazole)s

Synthesis, Properties, and Solar Cell Performance of Poly(4‐(p‐alkoxystyryl)thiazole)s

Poly(4-styrylthiazole)s exhibit optical properties comparable to their thiophene analogues, but provide ≈0.3 V higher open circuit voltages in photovoltaic cells, due to their stabilized frontier orbital levels.

[Full Paper]
Jakob Jäger, Sandra Schraff, Frank Pammer
Macromol. Chem. Phys., January 15, 2018, https://doi.org/10.1002/macp.201700496 Read article

Synthesis of Polypyrrole Inverse Opals through an Air–Water Interface Polymerization Method and Their Application in Dye-Sensitized Solar Cells

Synthesis of Polypyrrole Inverse Opals through an Air–Water Interface Polymerization Method and Their Application in Dye‐Sensitized Solar Cells

An air–water interface polymerization method is proposed for the fabrication of polypyrrole inverse opals without overlayers, during which colloidal crystals floating on pyrrole solution are employed as templates for the polymerization of pyrrole. The doped inverse opals could be applied as alternatives for the Pt counter-electrodes in dye-sensitized solar cells.

[Full Paper]
Liduo Deng, Likui Wang, Yunxing Li, Gang Shi, Yun Liu, Bolong Yao
Macromol. Chem. Phys., January 15, 2018, https://doi.org/10.1002/macp.201700489 Read article

Heterojunction Engineering for High Efficiency Cesium Formamidinium Double-Cation Lead Halide Perovskite Solar Cells

Heterojunction Engineering for High Efficiency Cesium Formamidinium Double‐Cation Lead Halide Perovskite Solar Cells

With or without PTAA: A p-type graded heterojunction (GHJ) structure is constructed by deploying a gradient distribution of poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) in a shallow perovskite layer. The device based on this structure gives a power conversion efficiency of ≈20 %, significantly superior to that of the control planar cell (18.6 % efficiency), which is mainly because of the enhanced charge transfer and collection, and reduced interfacial trap states.

[Communication]
Yihui Wu, Peng Wang, Shubo Wang, Zenghua Wang, Bing Cai, Xiaojia Zheng, Yu Chen, Ningyi Yuan, Jianning Ding, Wen-Hua Zhang
ChemSusChem, January 15, 2018, https://doi.org/10.1002/cssc.201702221 Read article

Indaceno-Based Conjugated Polymers for Polymer Solar Cells

Indaceno‐Based Conjugated Polymers for Polymer Solar Cells

Indaceno-based conjugated polymers have provided numerous possibilities in the field of organic electronics, especially for polymer solar cells. Recent years have presented tremendous progress, with power conversion efficiencies of more than 11%. In this review, recent developments of the indaceno-based conjugated polymers are summarized by categorizing them into four areas.

[Review]
Yuli Yin, Yong Zhang, Liancheng Zhao
Macromol. Rapid Commun., January 04, 2018, https://doi.org/10.1002/marc.201700697 Read article

Design and Synthesis of a Novel n-Type Polymer Based on Asymmetric Rylene Diimide for the Application in All-Polymer Solar Cells

Design and Synthesis of a Novel n‐Type Polymer Based on Asymmetric Rylene Diimide for the Application in All‐Polymer Solar Cells

The first n-type polymer based on the asymmetric rylene diimide is designed and synthesized. PTDI-T could realize a power conversion efficiency of 4.70% by using PTB7-Th as a donor polymer, which is obviously higher than those of the analogue polymers of PPDI-2T and PDTCDI.

[Communication]
Jing Yang, Fan Chen, Huijuan Ran, Jian-Yong Hu, Bo Xiao, Ailing Tang, Xiaochen Wang, Erjun Zhou
Macromol. Rapid Commun., January 02, 2018, https://doi.org/10.1002/marc.201700715 Read article

New n-Type Solution Processable All Conjugated Polymer Network: Synthesis, Optoelectronic Characterization, and Application in Organic Solar Cells

New n‐Type Solution Processable All Conjugated Polymer Network: Synthesis, Optoelectronic Characterization, and Application in Organic Solar Cells

A new solution-processable n-type conjugated polymer network (PNT1) is synthesized through a palladium-catalyzed Stille cross-coupling reaction following the A3 + B2 synthetic approach. PTN1 is employed as electron acceptor in solution processed bulk heterojunction organic solar cells, demonstrating the use of polymer networks in optoelectronic applications.

[Communication]
Hakan Bildirir, Dario Di Carlo Rasi, Martijn M. Wienk, René A. J. Janssen, Apostolos Avgeropoulos, Vasilis G. Gregoriou, Sybille Allard, Ullrich Scherf, Christos L. Chochos
Macromol. Rapid Commun., December 18, 2017, https://doi.org/10.1002/marc.201700629 Read article

Reducing Trap-Assisted Recombination in Small Organic Molecule-Based Photovoltaics by the Addition of a Conjugated Block Copolymer

Reducing Trap‐Assisted Recombination in Small Organic Molecule‐Based Photovoltaics by the Addition of a Conjugated Block Copolymer

The performance of small-molecule-based organic photovoltaics is greatly improved by the addition of a conjugated block copolymer composed of difluoroquinoxaline and thienopyrrolodione blocks (D130). It is revealed that the addition of D130 significantly reduced the trap density of the device. In addition, the photostability of the device is significantly enhanced by the incorporation of D130.

[Communication]
Kyuwan Cho, Jinseck Kim, So Yeon Yoon, Ka Yeon Ryu, Song-Rim Jang, Bogyu Lim, Kyungkon Kim
Macromol. Rapid Commun., December 08, 2017, https://doi.org/10.1002/marc.201700630 Read article

Multifunctional Diketopyrrolopyrrole-Based Conjugated Polymers with Perylene Bisimide Side Chains

Multifunctional Diketopyrrolopyrrole‐Based Conjugated Polymers with Perylene Bisimide Side Chains

Electron-deficient perylene bisimide linked by flexible alkyl side chains makes the diketopyrrolopyrrole-based conjugated polymers can be used as electron donor, electron acceptor, and single-component material in organic solar cells.

[Communication]
Cheng Li, Changshi Yu, Wenbin Lai, Shijie Liang, Xudong Jiang, Guitao Feng, Jianqi Zhang, Yunhua Xu, Weiwei Li
Macromol. Rapid Commun., November 24, 2017, https://doi.org/10.1002/marc.201700611 Read article

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