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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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Perovskite Solar Cells: Perovskite Solar Cells on Corrugated Substrates with Enhanced Efficiency (Small 46/2016)

Perovskite Solar Cells: Perovskite Solar Cells on Corrugated Substrates with Enhanced Efficiency (Small 46/2016)

On page 6346, F. So and co-workers fabricate organometallic halide perovskite solar cells on nanoscaled corrugated substrates using colloidal lithography followed by reactive ion etching. The results reveal that light absorption is enhanced, demonstrated by an increase in average power conversion efficiency from 8.7% for the planar devices to 13% for the corrugated devices.

[Frontispiece]
Yu Luo, Shuyi Liu, Nilesh Barange, Li Wang, Franky So
Small, December 08, 2016, DOI: 10.1002/smll.201670241. Read article

Novel Copolymers Based Tetrafluorobenzene and Difluorobenzothiadiazole for Organic Solar Cells with Prominent Open Circuit Voltage and Stability

Novel Copolymers Based Tetrafluorobenzene and Difluorobenzothiadiazole for Organic Solar Cells with Prominent Open Circuit Voltage and Stability

A novel block 2TPF4 is successfully used in constructing polymers PBT-2TPF4, PffBT-2TPF4. It is first demonstrated that 2TPF4 is a promising acceptor block for construction of the donor copolymers which possess high Voc, prominent crystallinity, and long-term stability, simultaneously.

[Communication]
Xunfan Liao, Feiyan Wu, Yongkang An, Qian Xie, Lie Chen, Yiwang Chen
Macromol. Rapid Commun., December 08, 2016, DOI: 10.1002/marc.201600556. Read article

Oxygenated CdS Buffer Layers Enabling High Open-Circuit Voltages in Earth-Abundant Cu2BaSnS4 Thin-Film Solar Cells

Oxygenated CdS Buffer Layers Enabling High Open‐Circuit Voltages in Earth‐Abundant Cu2BaSnS4 Thin‐Film Solar Cells

Earth-abundant Cu2BaSnS4 (CBTS) thin films exhibit the optoelectronic and defect properties suitable as an absorber for the top cell of tandem photovoltaic solar cell devices. Oxygenated CdS (CdS:O) buffers enable high V OC's of 0.9–1.1 V in CBTS thin-film solar cells by minimizing interface recombination.

[Full Paper]
Jie Ge, Prakash Koirala, Corey R. Grice, Paul J. Roland, Yue Yu, Xinxuan Tan, Randy J. Ellingson, Robert W. Collins, Yanfa Yan
Adv. Energy Mater., December 08, 2016, DOI: 10.1002/aenm.201601803. Read article

Room-Temperature Atomic Layer Deposition of Al2O3: Impact on Efficiency, Stability and Surface Properties in Perovskite Solar Cells

Room‐Temperature Atomic Layer Deposition of Al2O3: Impact on Efficiency, Stability and Surface Properties in Perovskite Solar Cells

Protected perovskites: Improved perovskite film stability in ambient air and solar cell power conversion efficiency (PCE) are achieved by covering an aged perovskite film with a thin Al2O3 layer prepared by atomic layer deposition (ALD) at room temperature (RT). High-resolution X-ray photoelectron spectroscopy is used to understand the effect of the ALD precursors on the perovskite film properties.

[Communication]
Malgorzata Kot, Chittaranjan Das, Zhiping Wang, Karsten Henkel, Zied Rouissi, Konrad Wojciechowski, Henry J. Snaith, Dieter Schmeisser
ChemSusChem, December 07, 2016, DOI: 10.1002/cssc.201601186. Read article

An All-Solution Processed Recombination Layer with Mild Post-Treatment Enabling Efficient Homo-Tandem Non-fullerene Organic Solar Cells

An All‐Solution Processed Recombination Layer with Mild Post‐Treatment Enabling Efficient Homo‐Tandem Non‐fullerene Organic Solar Cells

The first homo-tandem non-fullerene organic solar cell enabled by a novel recombination layer which only requires a very mild thermal annealing treatment is reported. The best efficiency achieved is 10.8% with a Voc over 2.1 V, which is the highest Voc for double-junction organic solar cells reported to date.

[Communication]
Shangshang Chen, Guangye Zhang, Jing Liu, Huatong Yao, Jianquan Zhang, Tingxuan Ma, Zhengke Li, He Yan
Adv. Mater., December 07, 2016, DOI: 10.1002/adma.201604231. Read article

Porous Nanomaterials for Ultrabroadband Omnidirectional Anti-Reflection Surfaces with Applications in High Concentration Photovoltaics

Porous Nanomaterials for Ultrabroadband Omnidirectional Anti‐Reflection Surfaces with Applications in High Concentration Photovoltaics

Low-index nanoporous materials that exploit optimized chemistries and self-assembly processes are demonstrated, with over ≈98% of transmission efficiency and angle-/polarization-insensitivity up to ±40° across a broad solar spectrum range. Applying such nanoporous anti-reflection coatings onto the optical elements in a concentration photovoltaic platform leads to a relative improvement of ≈8% in photovoltaic conversion efficiencies.

[Full Paper]
Yuan Yao, Kyu-Tae Lee, Xing Sheng, Nicolas A. Batara, Nina Hong, Junwen He, Lu Xu, Muhammad M. Hussain, Harry A. Atwater, Nathan S. Lewis, Ralph G. Nuzzo, John A. Rogers
Adv. Energy Mater., December 06, 2016, DOI: 10.1002/aenm.201601992. Read article

Pronounced Effects of a Triazine Core on Photovoltaic Performance–Efficient Organic Solar Cells Enabled by a PDI Trimer-Based Small Molecular Acceptor

Pronounced Effects of a Triazine Core on Photovoltaic Performance–Efficient Organic Solar Cells Enabled by a PDI Trimer‐Based Small Molecular Acceptor

A novel small molecular acceptor with electron-deficient 1,3,5-triazine as the core and perylene diimides as the arms is developed as the acceptor material for efficient bulk heterojunction organic solar cells with an efficiency of 9.15%.

[Communication]
Yuwei Duan, Xiaopeng Xu, He Yan, Wenlin Wu, Zuojia Li, Qiang Peng
Adv. Mater., December 06, 2016, DOI: 10.1002/adma.201605115. Read article

π-Conjugated Lewis Base: Efficient Trap-Passivation and Charge-Extraction for Hybrid Perovskite Solar Cells

π‐Conjugated Lewis Base: Efficient Trap‐Passivation and Charge‐Extraction for Hybrid Perovskite Solar Cells

A π-conjugated Lewis base is introduced into perovskite solar cells, namely, indacenodithiophene end-capped with 1.1-dicyanomethylene-3-indanone (IDIC), as a multifunctional interlayer which combines efficient trap-passivation and electron-extraction. Perovskite solar cells with IDIC layers yield higher photovoltages and photocurrents, and 45% enhanced efficiency compared with control devices without IDIC.

[Communication]
Yuze Lin, Liang Shen, Jun Dai, Yehao Deng, Yang Wu, Yang Bai, Xiaopeng Zheng, Jiayu Wang, Yanjun Fang, Haotong Wei, Wei Ma, Xiao Cheng Zeng, Xiaowei Zhan, Jinsong Huang
Adv. Mater., December 06, 2016, DOI: 10.1002/adma.201604545. Read article

Extremely low surface recombination in 1 Ω cm n-type monocrystalline silicon

Extremely low surface recombination in 1 Ω cm n‐type monocrystalline silicon

Minimizing recombination, also known as passivation, has become a major topic of study as more efficient silicon solar cells are required. In this study a triple layer a-Si/SiO/SiNx dielectric coating has been charged extrinsically using corona to demonstrate one of the lowest surface recombination parameters for planar, float zone, n-type, 1 Ωcm silicon: Seff = 0.1 cm/s at Δn = 1015 cm–3, equivalent to a saturation current density J0s = 0.3 fA/cm2, and a 1-sun implied open-circuit voltage of 738 mV.

[Rapid Research Letter]
Ruy S. Bonilla, Christian Reichel, Martin Hermle, Peter R. Wilshaw
Phys. Status Solidi RRL, December 05, 2016, DOI: 10.1002/pssr.201600307. Read article

Rational Design of High-Performance Wide-Bandgap (≈2 eV) Polymer Semiconductors as Electron Donors in Organic Photovoltaics Exhibiting High Open Circuit Voltages (≈1 V)

Rational Design of High‐Performance Wide‐Bandgap (≈2 eV) Polymer Semiconductors as Electron Donors in Organic Photovoltaics Exhibiting High Open Circuit Voltages (≈1 V)

High-performance wide-bandgap copolymers as electron donors for organic photovoltaics have been developed by the rational design of “D–A” copolymers consisting of indacenodithiophene or indacenodithieno[3,2-b]thiophene as the electron-rich unit and thienopyrroledione as the electron-deficient moiety in terms of alkyl side chain engineering and distance of the electron-rich and electron-deficient monomers within the repeat unit of the polymer chain.

[Communication]
Christos L. Chochos, Athanasios Katsouras, Nicola Gasparini, Chrysanthos Koulogiannis, Tayebeh Ameri, Christoph J. Brabec, Apostolos Avgeropoulos
Macromol. Rapid Commun., December 05, 2016, DOI: 10.1002/marc.201600614. Read article

Achieving High-Performance Ternary Organic Solar Cells through Tuning Acceptor Alloy

Achieving High‐Performance Ternary Organic Solar Cells through Tuning Acceptor Alloy

Acceptor alloys based on n-type small molecular and fullerene derivatives are used to fabricate the ternary solar cell. The highest performance of optimized ternary device is 10.4%, which is the highest efficiency for one donor/two acceptors-based ternary systems. Three important parameters, JSC, VOC, and FF, of the optimized ternary device are all higher than the binary reference devices.

[Communication]
Yusheng Chen, Pan Ye, Zhen-Gang Zhu, Xinlong Wang, Lei Yang, Xiaozhou Xu, Xiaoxi Wu, Tao Dong, Hao Zhang, Jianhui Hou, Feng Liu, Hui Huang
Adv. Mater., December 05, 2016, DOI: 10.1002/adma.201603154. Read article

Photo-Induced Charge Carrier Recombination Kinetics in Small Molecule Organic Solar Cells and the Influence of Film Nanomorphology

Photo‐Induced Charge Carrier Recombination Kinetics in Small Molecule Organic Solar Cells and the Influence of Film Nanomorphology

Probing the recombination dynamics in small molecule organic solar cells is vital to understand how these devices operate and how we can further optimize them. In this review, it is highlighted how carrier kinetics in these devices is affected by molecular structure, device architecture and active-layer morphology. An overview of the photo-induced techniques is also provided.

[Review]
James W. Ryan, Emilio Palomares
Adv. Energy Mater., December 02, 2016, DOI: 10.1002/aenm.201601509. Read article

Alkyl Side-Chain Engineering in Wide-Bandgap Copolymers Leading to Power Conversion Efficiencies over 10%

Alkyl Side‐Chain Engineering in Wide‐Bandgap Copolymers Leading to Power Conversion Efficiencies over 10%

A series of wide-bandgap (WBG) copolymers with different alkyl side chains are synthesized. Among them, copolymer PBT1-EH with moderatly bulky side chains on the acceptor unit shows the best photovoltaic performance with power conversion efficiency over 10%. The results suggest that the alkyl side-chain engineering is an effective strategy to further tuning the optoelectronic properties of WBG copolymers.

[Communication]
Tao Liu, Xuexue Pan, Xiangyi Meng, Yu Liu, Donghui Wei, Wei Ma, Lijun Huo, Xiaobo Sun, Tack Ho Lee, Minjuan Huang, Hyosung Choi, Jin Young Kim, Wallace C. H. Choy, Yanming Sun
Adv. Mater., December 01, 2016, DOI: 10.1002/adma.201604251. Read article

Efficient and Air-Stable Mixed-Cation Lead Mixed-Halide Perovskite Solar Cells with n-Doped Organic Electron Extraction Layers

Efficient and Air‐Stable Mixed‐Cation Lead Mixed‐Halide Perovskite Solar Cells with n‐Doped Organic Electron Extraction Layers

Air-stable doping of the n–type fullerene layer in an n–i–p planar heterojunction perovskite device is capable of enhancing device efficiency and improving device stability. Employing a (HC(NH2)2)0.83Cs0.17Pb(I0.6Br0.4)3 perovskite as the photoactive layer, glass–glass laminated devices are reported, which sustain 80% of their “post burn-in” efficiency over 3400 h under full sun illumination in ambient conditions.

[Communication]
Zhiping Wang, David P. McMeekin, Nobuya Sakai, Stephan van Reenen, Konrad Wojciechowski, Jay B. Patel, Michael B. Johnston, Henry J. Snaith
Adv. Mater., December 01, 2016, DOI: 10.1002/adma.201604186. Read article

Triperylene Hexaimides Based All-Small-Molecule Solar Cells with an Efficiency over 6% and Open Circuit Voltage of 1.04 V

Triperylene Hexaimides Based All‐Small‐Molecule Solar Cells with an Efficiency over 6% and Open Circuit Voltage of 1.04 V

A small molecule DRCN5T as the donor with the inline image of 1.60 eV, and a 3D perylene diimide as electronic acceptor are used to fabricate non-fullerene all-small-molecule solar cells. Upon thermal annealing, the efficiency of the device is enhanced from 0.47% to 6.16% with a high Voc of 1.04 V and a small energy loss of 0.56 eV.

[Communication]
Ningning Liang, Dong Meng, Zetong Ma, Bin Kan, Xiangyi Meng, Zhong Zheng, Wei Jiang, Yan Li, Xiangjian Wan, Jianhui Hou, Wei Ma, Yongsheng Chen, Zhaohui Wang
Adv. Energy Mater., November 30, 2016, DOI: 10.1002/aenm.201601664. Read article

Critical Impact of Hole Transporting Layers and Back Electrode on the Stability of Flexible Organic Photovoltaic Module

Critical Impact of Hole Transporting Layers and Back Electrode on the Stability of Flexible Organic Photovoltaic Module

Critical impact of hole transporting layer (HTL) and back electrode on the stability of organic photovoltaics (OPVs) is discussed. The active and HTL layers are damaged by solvent of the printed Ag electrode, resulting in abrupt decay of the power conversion efficiency. Unstable features of the OPVs accompanied by chemical change of the PEDOT:PSS is further addressed with X-ray photoelectron spectroscopy (XPS).

[Full Paper]
Hyoung Jin Son, Sung Hyun Kim, Dong Hwan Kim
Adv. Energy Mater., November 30, 2016, DOI: 10.1002/aenm.201601289. Read article

Poly(3,4-Ethylenedioxythiophene): Methylnaphthalene Sulfonate Formaldehyde Condensate: The Effect of Work Function and Structural Homogeneity on Hole Injection/Extraction Properties

Poly(3,4‐Ethylenedioxythiophene): Methylnaphthalene Sulfonate Formaldehyde Condensate: The Effect of Work Function and Structural Homogeneity on Hole Injection/Extraction Properties

Comparing with poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), methylnaphthalene sulfonate formaldehyde condensate-doped PEDOT with higher work function, excellent homogeneity, but low conductivity exhibits higher hole injection/extraction capabilities in organic light-emitting diodes/perovskite solar cells. The semiconductivity of dopant and structural homogeneity are both key factors. The results demonstrate a panoramic prospect for the future design of dopant for PEDOT.

[Full Paper]
Yuda Li, Meiyue Liu, Yuan Li, Kai Yuan, Lijia Xu, Wei Yu, Runfeng Chen, Xueqing Qiu, Hin-Lap Yip
Adv. Energy Mater., November 29, 2016, DOI: 10.1002/aenm.201601499. Read article

Panchromatic Sequentially Cast Ternary Polymer Solar Cells

Panchromatic Sequentially Cast Ternary Polymer Solar Cells

A sequential-casting ternary method is developed to create stratified bulk heterojunction (BHJ) solar cells, in which the two BHJ layers are spin cast sequentially without the need of adopting a middle electrode and orthogonal solvents. This method is found to be particularly useful for polymers that form a mechanically alloyed morphology due to the high degree of miscibility in the blend.

[Communication]
Masoud Ghasemi, Long Ye, Qianqian Zhang, Liang Yan, Joo-Hyun Kim, Omar Awartani, Wei You, Abay Gadisa, Harald Ade
Adv. Mater., November 29, 2016, DOI: 10.1002/adma.201604603. Read article

A New Nonfullerene Electron Acceptor with a Ladder Type Backbone for High-Performance Organic Solar Cells

A New Nonfullerene Electron Acceptor with a Ladder Type Backbone for High‐Performance Organic Solar Cells

Nonfullerene acceptor FDICTF (2,9-bis(2methylene-(3-(1,1-dicyanomethylene)indanone))-7,​12-​dihydro-​4,​4,​7,​7,​12,​12-​hexaoctyl-​4H-​cyclopenta[2″,​1″:5,​6;3″,​4″:5′,​6′]​diindeno[1,​2-​b:1′,​2′-​b′]dithiophene) modified by fusing the fluorene core in a precursor, yields 10.06% high power conversion efficiency, and demonstrates that the ladder and fused core backbone in A–D–A structure molecules is an effective design strategy for high-performance nonfullerene acceptors.

[Communication]
Nailiang Qiu, Huijing Zhang, Xiangjian Wan, Chenxi Li, Xin Ke, Huanran Feng, Bin Kan, Hongtao Zhang, Qiang Zhang, Yan Lu, Yongsheng Chen
Adv. Mater., November 28, 2016, DOI: 10.1002/adma.201604964. Read article

Efficient Charge Transfer and Fine-Tuned Energy Level Alignment in a THF-Processed Fullerene-Free Organic Solar Cell with 11.3% Efficiency

Efficient Charge Transfer and Fine‐Tuned Energy Level Alignment in a THF‐Processed Fullerene‐Free Organic Solar Cell with 11.3% Efficiency

Fullerene-free organic solar cells show over 11% power conversion efficiency, processed by low toxic solvents. The applied donor and acceptor in the bulk heterojunction exhibit almost the same highest occupied molecular orbital level, yet exhibit very efficient charge creation.

[Communication]
Zhong Zheng, Omar M. Awartani, Bhoj Gautam, Delong Liu, Yunpeng Qin, Wanning Li, Alexander Bataller, Kenan Gundogdu, Harald Ade, Jianhui Hou
Adv. Mater., November 28, 2016, DOI: 10.1002/adma.201604241. Read article

Conjugated Oligothiophene Derivatives Based on Bithiophene with Unsaturated Bonds as Building Blocks for Solution-Processed Bulk Heterojunction Organic Solar Cells

Conjugated Oligothiophene Derivatives Based on Bithiophene with Unsaturated Bonds as Building Blocks for Solution‐Processed Bulk Heterojunction Organic Solar Cells

Conjugation rules! A new building block ATVTA that uses stiff carbon–carbon triple bonds (A) as the linkages on a 1,2-di(2-thienyl)-ethene (TVT) unit has been developed. The effects of three building blocks (TVT, AT2 and ATVTA units) and the nature of the terminal electron acceptors in several conjugated oligothiophene derivatives were studied systematically.

[Full Paper]
Chaohua Cui, Yue Wu, Man-Sing Cheung, Cheuk-Lam Ho, Qingchen Dong, Zhenyang Lin, Yongfang Li, Wai-Yeung Wong
Chem. Asian J., November 25, 2016, DOI: 10.1002/asia.201601281. Read article

Organic Planar Heterojunctions: From Models for Interfaces in Bulk Heterojunctions to High-Performance Solar Cells

Organic Planar Heterojunctions: From Models for Interfaces in Bulk Heterojunctions to High‐Performance Solar Cells

Heterojunctions of organic semiconductors are the most important element in organic photovoltaic devices (OPVs). The recent progress in research on planar heterojunctions is reviewed with respect to a fundamental understanding of the photophysical processes at the donor/acceptor interfaces in OPVs. This provides valuable information to overcome the current limitations regarding the performance of OPVs.

[Review]
Kyohei Nakano, Keisuke Tajima
Adv. Mater., November 25, 2016, DOI: 10.1002/adma.201603269. Read article

Enhanced stability of low temperature processed perovskite solar cells via augmented polaronic intensity of hole transporting layer

Enhanced stability of low temperature processed perovskite solar cells via augmented polaronic intensity of hole transporting layer

Perovskite devices incorporating F4TCNQ doped P3HT HTL exhibit 14 times higher device stability compared to conventional Li-TFSI/TBP doped P3HT HTL devices due to augmented polaronic intensity in F4TCNQ doped devices and owing to its inert interaction with perovskite layer, preventing aging-induced perovskite decomposition.

[Rapid Research Letter]
Md. Arafat Mahmud, Naveen Kumar Elumalai, Mushfika Baishakhi Upama, Dian Wang, Faiazul Haque, Matthew Wright, Kah Howe Chan, Cheng Xu, Ashraf Uddin
Phys. Status Solidi RRL, November 23, 2016, DOI: 10.1002/pssr.201600315. Read article

Dry-Deposited Transparent Carbon Nanotube Film as Front Electrode in Colloidal Quantum Dot Solar Cells

Dry‐Deposited Transparent Carbon Nanotube Film as Front Electrode in Colloidal Quantum Dot Solar Cells

Bringing the light: A press-transferred, transparent, single-walled carbon nanotube film is utilized as front electrode for planar colloidal quantum dot solar cells. The solar cells are fabricated on both glass and flexible substrates, and maximum power conversion efficiencies almost equal to that of an indium-doped tin oxide-based device can be achieved.

[Full Paper]
Xiaoliang Zhang, Kerttu Aitola, Carl Hägglund, Antti Kaskela, Malin B. Johansson, Kári Sveinbjörnsson, Esko I. Kauppinen, Erik M. J. Johansson
ChemSusChem, November 22, 2016, DOI: 10.1002/cssc.201601254. Read article

Complete Conversion of PbI2 to Methyl Ammonium PbI3 Improves Perovskite Solar Cell Efficiency

Complete Conversion of PbI2 to Methyl Ammonium PbI3 Improves Perovskite Solar Cell Efficiency

Controlling the process: The quaternary ammonium salt tetraoctylammonium bromide is used to manipulate the crystallization of PbI2 in the first deposition step of a perovskite film, which lead to facile incorporation of the methylammonium iodide into the Pb-I lattice and complete conversion of PbI2 to perovskite. This leads to improved device performance efficiency.

[Communication]
Lili Wang, Wei-Chun Lin, Christopher McCleese, Anton Kovalsky, Yixin Zhao, Clemens Burda
ChemPhysChem, November 22, 2016, DOI: 10.1002/cphc.201601168. Read article

High-Efficiency Perovskite Solar Cells Using Molecularly Engineered, Thiophene-Rich, Hole-Transporting Materials: Influence of Alkyl Chain Length on Power Conversion Efficiency

High‐Efficiency Perovskite Solar Cells Using Molecularly Engineered, Thiophene‐Rich, Hole‐Transporting Materials: Influence of Alkyl Chain Length on Power Conversion Efficiency

A sulfur-rich polycyclic aromatic hydrocarbon with a flat and rigid π-conjugated structure endowed with triarylamine groups is synthesized for highly efficient perovskite solar cells. The influence of alkyl chains, often introduced to increase the solubility of the hole-transporting materials, is furthermore investigated. Efficiencies as high as 18.1% are obtained.

[Full Paper]
Iwan Zimmermann, Javier Urieta-Mora, Paul Gratia, Juan Aragó, Giulia Grancini, Agustín Molina-Ontoria, Enrique Ortí, Nazario Martín, Mohammad Khaja Nazeeruddin
Adv. Energy Mater., November 21, 2016, DOI: 10.1002/aenm.201601674. Read article

Carbon Dangling Bonds in Photodegraded Polymer:Fullerene Solar Cells

Carbon Dangling Bonds in Photodegraded Polymer:Fullerene Solar Cells

For the first time, strong electron paramagnetic resonance evidence is provided that irradiation of bulk heterojunction polymer:fullerene solar cells by blue and shorter wavelength photons (<495 nm), likely assisted by highly energized (“hot”) polarons, generates C dangling bonds at the polymer:fullerene interfaces. This photodegradation process may be one of the key obstacles to commercialization of such cells.

[Full Paper]
Fadzai Fungura, William R. Lindemann, Joseph Shinar, Ruth Shinar
Adv. Energy Mater., November 21, 2016, DOI: 10.1002/aenm.201601420. Read article

Artifact Interpretation of Spectral Response Measurements on Two-Terminal Multijunction Solar Cells

Artifact Interpretation of Spectral Response Measurements on Two‐Terminal Multijunction Solar Cells

The formation of artifacts in the spectral response measurement of two-terminal multijunction solar cells is visually revealed by changing the cell properties and bias conditions in modeling. The simulations greatly help to understand the origins of artifacts, and to avoid the pitfall of misinterpreting the measured data, making the research in novel hybrid multijunction solar cells more reliable.

[Full Paper]
Fai Tong Si, Olindo Isabella, Miro Zeman
Adv. Energy Mater., November 17, 2016, DOI: 10.1002/aenm.201601930. Read article

Light-induced degradation and regeneration of multicrystalline silicon Al-BSF and PERC solar cells

Light‐induced degradation and regeneration of multicrystalline silicon Al‐BSF and PERC solar cells

In recent years, light-induced degradation (LID) has been identified to be a significant problem for multicrystalline silicon (multi-Si) passivated emitter and rear cell (PERC) solar cells. LID and regeneration has been observed for multi-Si PERC cells but not for aluminium back surface field (Al-BSF) cells. The authors report for the first time that multi-Si Al-BSF solar cells can also achieve almost complete regeneration after LID under 1 sun and elevated temperature.

[rrl solar]
Mrinalini Padmanabhan, Krutarth Jhaveri, Romika Sharma, Prabir Kanti Basu, Samuel Raj, Johnson Wong, Joel Li
Phys. Status Solidi RRL, November 16, 2016, DOI: 10.1002/pssr.201600173. Read article

Conductive and Stable Magnesium Oxide Electron-Selective Contacts for Efficient Silicon Solar Cells

Conductive and Stable Magnesium Oxide Electron‐Selective Contacts for Efficient Silicon Solar Cells

A highly conductive and thermally stable electrode composed of a nanoscale magnesium oxide/aluminium (MgOx/Al) contact is demonstrated to achieve moderately low resistivity Ohmic contacts on lightly doped n-type c-Si. A power conversion efficiency of 20% is obtained at a proof-of-concept stage of n-type c-Si solar cells with full-area MgOx/Al rear contacts.

[Full Paper]
Yimao Wan, Chris Samundsett, James Bullock, Mark Hettick, Thomas Allen, Di Yan, Jun Peng, Yiliang Wu, Jie Cui, Ali Javey, Andres Cuevas
Adv. Energy Mater., November 16, 2016, DOI: 10.1002/aenm.201601863. Read article

Significant Improvement in the Performance of PbSe Quantum Dot Solar Cell by Introducing a CsPbBr3 Perovskite Colloidal Nanocrystal Back Layer

Significant Improvement in the Performance of PbSe Quantum Dot Solar Cell by Introducing a CsPbBr3 Perovskite Colloidal Nanocrystal Back Layer

A PbSe quantum dot solar cell with an efficiency of 7.22% and a fill factor of 62.4% is achieved by applying a CsPbBr3 perovskite quantum dot back layer. The back layer can effectively suppress carrier recombination at the PbSe/Au interfaces, hence lead to significant improvement in open-circuit voltage and fill factor.

[Communication]
Zhilong Zhang, Zihan Chen, Jianbing Zhang, Weijian Chen, Jianfeng Yang, Xiaoming Wen, Bo Wang, Naoya Kobamoto, Lin Yuan, John A. Stride, Gavin J. Conibeer, Robert J. Patterson, Shujuan Huang
Adv. Energy Mater., November 16, 2016, DOI: 10.1002/aenm.201601773. Read article

Quantitative Doping of Chlorine in Formamidinium Lead Trihalide (FAPbI3−xClx) for Planar Heterojuction Perovskite Solar Cells

Quantitative Doping of Chlorine in Formamidinium Lead Trihalide (FAPbI3−xClx) for Planar Heterojuction Perovskite Solar Cells

MACl, as additive to the standard FAPbI3 precursor solution, enables near-complete coverage perovskite film to stabilize the phase-pure black FAPbI3 annealing at 100 °C. A partial substitution of FACl for FAI in precursor solution is used to grow FA perovskites with controllable chlorine doped fraction, which improves the performance of the planar perovskite solar cell.

[Communication]
Cheng Mu, Jinlong Pan, Shiqiang Feng, Qi Li, Dongsheng Xu
Adv. Energy Mater., November 16, 2016, DOI: 10.1002/aenm.201601297. Read article

Hybrid process for texturization of diamond wire sawn multicrystalline silicon solar cell

Hybrid process for texturization of diamond wire sawn multicrystalline silicon solar cell

Metal-assisted chemical etching (MACE) process was used to introduce porous seeding structure in diamond wire sawn (DWS) mc-Si. Well distributed oval pits could be formed by following acid texture process. With second MACE process and nanostructure rebuilding solution treatment, a best efficiency of 17.96% solar cell was obtained, showing 0.45% efficiency higher than that in DWS mc-Si solar cell with simple acid texture process.

[rrl solar]
Ye Jiang, Honglie Shen, Tian Pu, Chaofan Zheng, Quntao Tang, Wangyang Yang, Jing Wu, Chunbao Rui, Yufang Li
Phys. Status Solidi RRL, November 14, 2016, DOI: 10.1002/pssr.201600318. Read article

Molecular Engineering of Highly Efficient Small Molecule Nonfullerene Acceptor for Organic Solar Cells

Molecular Engineering of Highly Efficient Small Molecule Nonfullerene Acceptor for Organic Solar Cells

The non-fullerene acceptor (NFA) BAF-4CN is synthesized for organic photovoltaic (OPV) application to overcome the drawbacks of fullerene. BAF-4CN shows stronger absorption compared to phenyl C71-butyric acid methyl ester and has an excellent electron accepting nature and high charge carrier mobility. A power conversion efficiency of 8.4% is achieved from PffBT4T-2OD:BAF-4CN based bulk heterojunction solar cells. This may be a promising substitute for fullerene in low-cost solution-processed OPV.

[Full Paper]
Suman, Vinay Gupta, Anirban Bagui, Surya Prakash Singh
Adv. Funct. Mater., November 10, 2016, DOI: 10.1002/adfm.201603820. Read article

On the Impact of Contact Selectivity and Charge Transport on the Open-Circuit Voltage of Organic Solar Cells

On the Impact of Contact Selectivity and Charge Transport on the Open‐Circuit Voltage of Organic Solar Cells

The impact of charge carrier mobility and electrode selectivity on surface recombination is investigated by drift-diffusion modeling, charge extraction, electro- and photoluminescence. It is shown that for organic solar cells the reduced open-circuit voltage is not only due to actual recombination of charge carriers at the contact but mainly a consequence of the required driving force for the majority carriers.

[Full Paper]
Annika Spies, Mathias List, Tanmoy Sarkar, Uli Würfel
Adv. Energy Mater., November 09, 2016, DOI: 10.1002/aenm.201601750. Read article

An Effective Approach for High-Efficiency Photoelectrochemical Solar Cells by Using Bifunctional DNA Molecules Modified Photoanode

An Effective Approach for High‐Efficiency Photoelectrochemical Solar Cells by Using Bifunctional DNA Molecules Modified Photoanode

Two types of deoxyribonucleic acid molecules, extracted from fresh leaves of chickpea and wheat plants, employ as thin tunneling barrier at TiO2/dye interface to minimize the recombination rates as well as linker bridging units for the electrons to move toward the TiO2, thereby enhancing Voc and Jsc. This strategy might open up new opportunities for the widespread fabrication and application of dye-sensitized solar cells.

[Full Paper]
Özlem Ateş Sönmezoğlu, Seçkin Akın, Begüm Terzi, Serdal Mutlu, Savaş Sönmezoğlu
Adv. Funct. Mater., November 09, 2016, DOI: 10.1002/adfm.201603454. Read article

Reducing Hysteresis and Enhancing Performance of Perovskite Solar Cells Using Low-Temperature Processed Y-Doped SnO2 Nanosheets as Electron Selective Layers

Reducing Hysteresis and Enhancing Performance of Perovskite Solar Cells Using Low‐Temperature Processed Y‐Doped SnO2 Nanosheets as Electron Selective Layers

Low-temperature processed Y-doped SnO2 nanosheets are fabricated and applied as electron selective layer (ESL) in efficient perovskite solar cells. The champion device using a Y-SnO2 nanosheet array ESL achieves an efficiency of 17.29% (16.97%) when measured under reverse (forward) voltage scanning. The results suggest that low-temperature hydrothermal-synthesized Y-SnO2 is a promising ESL for fabricating efficient and hysteresis-less perovskite solar cells.

[Full Paper]
Guang Yang, Hongwei Lei, Hong Tao, Xiaolu Zheng, Junjie Ma, Qin Liu, Weijun Ke, Zhiliang Chen, Liangbin Xiong, Pingli Qin, Zhao Chen, Minchao Qin, Xinhui Lu, Yanfa Yan, Guojia Fang
Small, November 07, 2016, DOI: 10.1002/smll.201601769. Read article

Ultrafast Photogenerated Hole Extraction/Transport Behavior in a CH3NH3PbI3/Carbon Nanocomposite and Its Application in a Metal-Electrode-Free Solar Cell

Ultrafast Photogenerated Hole Extraction/Transport Behavior in a CH3NH3PbI3/Carbon Nanocomposite and Its Application in a Metal‐Electrode‐Free Solar Cell

Electrospin to win: An electrospun carbon nanofiber (CNF)/CH3NH3PbI3 perovskite nanocomposite shows increased free-electron diffusion length of the CH3NH3PbI3 phase, most of the photogenerated holes can be injected from CH3NH3PbI3 into the CNFs, and its fraction of free carriers is close to unity. A metal-electrode-free photovoltaic device is fabricated from this nanocomposite (see figure).

[Article]
Tao Ye, Xi Jiang, Dongyang Wan, Xingzhi Wang, Jun Xing, Thirumalai Venkatesan, Qihua Xiong, Seeram Ramakrishna
ChemPhysChem, November 07, 2016, DOI: 10.1002/cphc.201600817. Read article

Overcoming Interfacial Losses in Solution-Processed Organic Multi-Junction Solar Cells

Overcoming Interfacial Losses in Solution‐Processed Organic Multi‐Junction Solar Cells

The interface losses in both solution-processed inverted single- and multi-junction solar cells using representative polymer donors and hole-transporting layers (HTLs) are systematically investigated. A facile mixed HTL containing poly(3,4-ethylenedioxythiophene) polystyrene sulfonate and MoO x nanoparticles successfully overcomes the interfacial losses by reducing interface protonation, promoting better energy-level alignment, and forming a dense and smooth layer.

[Full Paper]
Xiaoyan Du, Ole Lytken, Manuela S. Killian, Jiamin Cao, Tobias Stubhan, Mathieu Turbiez, Patrik Schmuki, Hans-Peter Steinrück, Liming Ding, Rainer H. Fink, Ning Li, Christoph J. Brabec
Adv. Energy Mater., November 07, 2016, DOI: 10.1002/aenm.201601959. Read article

Toward High-Temperature Stability of PTB7-Based Bulk Heterojunction Solar Cells: Impact of Fullerene Size and Solvent Additive

Toward High‐Temperature Stability of PTB7‐Based Bulk Heterojunction Solar Cells: Impact of Fullerene Size and Solvent Additive

Thermal stability of poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)-carbonyl]thieno[3,4-b]thiophenediyl]]-based solar cells is found to depend on fullerene size and solvent additive. While [6,6]-phenyl-C71-butyric acid methyl ester diffusion is suppressed inside blends independently of the solvent additive, only removing residual additive by 140 °C annealing leads to solar cells resisting 140 °C over days with performance losses less than 10%.

[Full Paper]
Sadok Ben Dkhil, Martin Pfannmöller, Maria Ilenia Saba, Meriem Gaceur, Hamed Heidari, Christine Videlot-Ackermann, Olivier Margeat, Antonio Guerrero, Juan Bisquert, Germa Garcia-Belmonte, Alessandro Mattoni, Sara Bals, Jörg Ackermann
Adv. Energy Mater., November 07, 2016, DOI: 10.1002/aenm.201601486. Read article

Deposition Methods of Graphene as Electrode Material for Organic Solar Cells

Deposition Methods of Graphene as Electrode Material for Organic Solar Cells

The significant increase in graphene research over the past ten years includes the use of graphene in organic solar cells (OSCs). Current challenges and future research directions for graphene electrodes combined with OSCs are discussed, covering the latest developments in deposition methods of graphene electrodes, with an emphasis on manufacturing commercializable graphene electrode-based OSCs.

[Review]
Rajni Garg, Sait Elmas, Thomas Nann, Mats R. Andersson
Adv. Energy Mater., November 07, 2016, DOI: 10.1002/aenm.201601393. Read article

Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells

Electric Field and Mobility Dependent First‐Order Recombination Losses in Organic Solar Cells

Fill Factor losses in organic solar cells are decoupled into recombination with first-order and second-order (bimolecular) kinetics. Under steady-state, the former losses dominate the latter from short-circuit to maximum-power point. The first-order photocurrent losses are attributed to geminate charge-transfer state recombination, or recombination of photogenerated and injected charges. Both loss mechanisms can be minimized by increasing the slower carrier mobility.

[Full Paper]
Martin Stolterfoht, Safa Shoaee, Ardalan Armin, Hui Jin, Ivan Kassal, Wei Jiang, Paul Burn, Paul Meredith
Adv. Energy Mater., November 07, 2016, DOI: 10.1002/aenm.201601379. Read article

Multifunctional Rare-Earth-Doped Tin Oxide Compact Layers for Improving Performances of Photovoltaic Devices

Multifunctional Rare‐Earth‐Doped Tin Oxide Compact Layers for Improving Performances of Photovoltaic Devices

Multifunctional compact layers of rare-earth (RE)-doped tin oxide (SnO2:(Yb3+, RE3+), RE = Eu, Dy, Er, etc.) demonstrate a reduced recombination rate of electron–hole pairs, an enhanced transparency, a broadened light absorption range, and an enhanced long-term stability of the photo­voltaic device.

[Communication]
Yaoming Xiao, Gaoyi Han, Jingyi Yue, Wenjing Hou, Jihuai Wu
Adv. Mater. Interfaces, November 07, 2016, DOI: 10.1002/admi.201600881. Read article

Efficient Indium-Doped TiOx Electron Transport Layers for High-Performance Perovskite Solar Cells and Perovskite-Silicon Tandems

Efficient Indium‐Doped TiOx Electron Transport Layers for High‐Performance Perovskite Solar Cells and Perovskite‐Silicon Tandems

Solution-processed, indium-doped TiOx films are shown to be very effective electron transport/hole-blocking layers for high-performance perovskite cells. Doping improves the conductivity and work-function energy alignment at the ETL/perovskite interface, leading to high fill-factor and open-circuit voltage. An efficiency of ≈19.3% is demonstrated for a perovskite cell, and a steady-state efficiency of 24.5% is presented for a four-terminal perovskite-silicon tandem cell.

[Full Paper]
Jun Peng, The Duong, Xianzhong Zhou, Heping Shen, Yiliang Wu, Hemant Kumar Mulmudi, Yimao Wan, Dingyong Zhong, Juntao Li, Takuya Tsuzuki, Klaus J. Weber, Kylie R. Catchpole, Thomas P. White
Adv. Energy Mater., November 04, 2016, DOI: 10.1002/aenm.201601768. Read article

Multi-crystalline silicon solar cells with metal-assisted nano-texturing using HNO3 as hole injection agent

Multi‐crystalline silicon solar cells with metal‐assisted nano‐texturing using HNO3 as hole injection agent

A novel method of single step metal-assisted etching (MAE) with HNO3 as hole injection agent is used for nano-texturing multi-crystalline silicon wafers which proved to improve light trapping with a jsc enhancement of 0.9 mA/cm2 and 0.6% absolute efficiency gain compared to standard acidic textured cells.

[rrl solar]
Fırat Es, Gülsen Baytemir, Mustafa Kulakci, Raşit Turan
Phys. Status Solidi RRL, November 03, 2016, DOI: 10.1002/pssr.201600245. Read article

Effect of Photogenerated Dipoles in the Hole Transport Layer on Photovoltaic Performance of Organic–Inorganic Perovskite Solar Cells

Effect of Photogenerated Dipoles in the Hole Transport Layer on Photovoltaic Performance of Organic–Inorganic Perovskite Solar Cells

The influence of optically generated dipoles is reported in the hole transport layer of PTB7 on charge recombination dynamics occurring at active layer in perovskite solar cells. By monitoring the recombination of photogenerated carriers through magneto-photocurrent measurements, it is shown that photoinduced dipoles in PTB7 layer lead to less recombination and more dissociation in perovskite solar cells under device-operation condition.

[Full Paper]
Mahshid Ahmadi, Yu-Che Hsiao, Ting Wu, Qing Liu, Wei Qin, Bin Hu
Adv. Energy Mater., October 31, 2016, DOI: 10.1002/aenm.201601575. Read article

Improving the Performance of Formamidinium and Cesium Lead Triiodide Perovskite Solar Cells using Lead Thiocyanate Additives

Improving the Performance of Formamidinium and Cesium Lead Triiodide Perovskite Solar Cells using Lead Thiocyanate Additives

The effects of additives: The power conversion efficiency (PCE) of mixed formamidinium (FA) and cesium lead triiodide perovskite solar cells is improved by introducing lead thiocyanate additives. The best PCE is improved from 17.61 to 19.57 % and the effect of additives is thoroughly studied. Voc=open-circuit voltage, Jsc=short-circuit current density, FF=fill factor.

[Full Paper]
Yue Yu, Changlei Wang, Corey R. Grice, Niraj Shrestha, Jing Chen, Dewei Zhao, Weiqiang Liao, Alexander J. Cimaroli, Paul J. Roland, Randy J. Ellingson, Yanfa Yan
ChemSusChem, October 26, 2016, DOI: 10.1002/cssc.201601027. Read article

Phenothiazine-Based D–A–π–A Dyes for Highly Efficient Dye-Sensitized Solar Cells: Effect of Internal Acceptor and Non-Conjugated π-Spacer on Device Performance

Phenothiazine‐Based D–A–π–A Dyes for Highly Efficient Dye‐Sensitized Solar Cells: Effect of Internal Acceptor and Non‐Conjugated π‐Spacer on Device Performance

Organic dyes for solar cells: Three new D–A–π–A metal-free organic dyes based on phenothiazine as a donor (D) and non-conjugated π-spacer were designed and synthesized. The incorporation of different ‘internal acceptors’ (electron traps) such as benzothiadiazole (BTD), benzotriazole (BTA), and pyridine were shown to allow systematic tuning of the energy levels and the photophysical properties. The best dye (AL-1) shows an efficiency of 8.5 % (Jsc=15.42 mA cm−2, Voc=0.78 V, FF=68 %).

[Full Paper]
Satyawan Nagane, Amol Ichake, Ishita Agrawal, Aditya Sadhanala, Richard H. Friend, Satishchandra Ogale, Prakash P. Wadgaonkar
ChemPlusChem, October 26, 2016, DOI: 10.1002/cplu.201600492. Read article

Constructing Synergetic Trilayered TiO2 Photoanodes Based on a Flexible Nanotube Array/Ti Substrate for Efficient Solar Cells

Constructing Synergetic Trilayered TiO2 Photoanodes Based on a Flexible Nanotube Array/Ti Substrate for Efficient Solar Cells

A trilayered TiO2 photoanode on anodized nanotube array/Ti foil substrate is designed for efficient dye-sensitized solar cells. The fabricated cell exhibits a high power conversion efficiency of 8.02 % for its pronounced light harvesting and efficient charge collection.

[Full Paper]
Yang Wang, Xueqin Liu, Zhen Li, Ya Cao, Yinchang Li, Yanli Zhao
ChemNanoMat, October 04, 2016, DOI: 10.1002/cnma.201600243. Read article

Perovskite Solar Cells on Corrugated Substrates with Enhanced Efficiency

Perovskite Solar Cells on Corrugated Substrates with Enhanced Efficiency

A simple and scalable method to fabricate nano-scaled corrugations on substrate of perovskite solar cells is demonstrated. Faster chemical reaction between lead iodide and methyl ammonium iodide is observed in the corrugated devices. Optical field enhancements in the corrugated devices are confirmed with the finite-difference time-domain modeling and simulation. As a result, the perovskite solar cells fabricated on corrugated substrates show a 50% enhancement of power conversion efficiency compared to planar devices.

[Full Paper]
Yu Luo, Shuyi Liu, Nilesh Barange, Li Wang, Franky So
Small, September 27, 2016, DOI: 10.1002/smll.201601974. Read article

Role of the Bulky Aryloxy Group at the Non-Peripheral Position of Phthalocyanines for Dye Sensitized Solar Cells

Role of the Bulky Aryloxy Group at the Non‐Peripheral Position of Phthalocyanines for Dye Sensitized Solar Cells

A selective performance: Photovoltaic performance of carboxyZnPc substituted with bulky semiflexible aryloxy groups at the non-peripheral positions (see structure) is clearly influenced by the steric hindrance of the substituents with respect to the semiconducting surface. Thus, regioisomers with substituents oriented towards the carboxylic acid anchoring group turn out to have lower adsorption densities, and, consequently, lower short-circuit photocurrents (Jsc) and efficiencies.

[Communication]
Lara Tejerina, M. Victoria Martínez-Díaz, Mohammad K. Nazeeruddin, Michael Grätzel, Tomas Torres
ChemPlusChem, July 20, 2016, DOI: 10.1002/cplu.201600325. Read article

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