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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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Lead-free mesoscopic Cs2SnI6 perovskite solar cells using different nanostructured ZnO nanorods as electron transport layers

Lead‐free mesoscopic Cs2SnI6 perovskite solar cells using different nanostructured ZnO nanorods as electron transport layers

Lead-free and more air-stable defective perovskite Cs2SnI6 is firstly adopted as a light absorber layer for a mesoporous p–i–n perovskite solar cell with promising power conversion efficiency (PCE) near 1%.

[rrl solar]
Xiaofeng Qiu, Yanan Jiang, Hailiang Zhang, Zhiwen Qiu, Shuai Yuan, Ping Wang, Bingqiang Cao
Phys. Status Solidi RRL, June 30, 2016, DOI: 10.1002/pssr.201600166. Read article

Microstructural analysis of the cementation process during soiling on glass surfaces in arid and semi-arid climates

Microstructural analysis of the cementation process during soiling on glass surfaces in arid and semi‐arid climates

Accumulation of dust and dirt on PV modules and solar reflectors leads to significant power losses due to shading or scattering of sunlight. Especially in arid and semi-arid regions, this becomes more and more a severe performance issue for solar energy systems. In this Letter, the authors present a microstructural study of the soiling process on glass surfaces in desert regions, identifying fibrous structures as a main reason for particle cementation.

[rrl solar]
Klemens Ilse, Martina Werner, Volker Naumann, Benjamin W. Figgis, Christian Hagendorf, Jörg Bagdahn
Phys. Status Solidi RRL, June 29, 2016, DOI: 10.1002/pssr.201600152. Read article

Low-Energy Electron-Induced Transformations in Organolead Halide Perovskite

Low‐Energy Electron‐Induced Transformations in Organolead Halide Perovskite

Explaining the break-up: Low-energy electrons (4.5 to 60 eV) can affect structural and chemical properties of methylammonium (MA) lead iodide perovskite (MAPbI3) via interactions with the organic part. This results in MAPbI3 decomposition and aggregation of the hydrocarbon layer.

[Communication]
Aleksandar R. Milosavljević, Weixin Huang, Subha Sadhu, Sylwia Ptasinska
Angew. Chem. Int. Ed., June 29, 2016, DOI: 10.1002/anie.201605013. Read article

Pure Cubic-Phase Hybrid Iodobismuthates AgBi2I7 for Thin-Film Photovoltaics

Pure Cubic‐Phase Hybrid Iodobismuthates AgBi2I7 for Thin‐Film Photovoltaics

Solution-processed AgBi2I7 thin films are developed and deployed to produce air-stable and lead-free photovoltaic devices. The AgBi2I7 thin film crystallized in the cubic phase with dense and pinhole-free surface morphologies, and has an optical absorption that covers the visible spectrum and into the near-infrared region. The AgBi2I7 devices showed stable operation over 10 days under ambient conditions.

[Communication]
Younghoon Kim, Zhenyu Yang, Ankit Jain, Oleksandr Voznyy, Gi-Hwan Kim, Min Liu, Li Na Quan, F. Pelayo García de Arquer, Riccardo Comin, James Z. Fan, Edward H. Sargent
Angew. Chem. Int. Ed., June 29, 2016, DOI: 10.1002/anie.201603608. Read article

Fullerene Adducts Bearing Cyano Moiety for Both High Dielectric Constant and Good Active Layer Morphology of Organic Photovoltaics

Fullerene Adducts Bearing Cyano Moiety for Both High Dielectric Constant and Good Active Layer Morphology of Organic Photovoltaics

Fullerene adducts bearing a cyano moiety with large dipole moment show not only a high dielectric constant, but also good compatibility with the donor polymer for good blend morphology, and exhibit good polymer solar cell device performances.

[Full Paper]
Sheng Zhang, Zijian Zhang, Jun Liu, Lixiang Wang
Adv. Funct. Mater., June 29, 2016, DOI: 10.1002/adfm.201600350. Read article

Plasmonic Enhancement of Biosolar Cells Employing Light Harvesting Complex II Incorporated with Core–Shell Metal@TiO2 Nanoparticles

Plasmonic Enhancement of Biosolar Cells Employing Light Harvesting Complex II Incorporated with Core–Shell Metal@TiO2 Nanoparticles

Three types of metal@TiO2 plasmonic nanoparticles (PNPs) conjugated with light-harvesting complex II (LHCII) provide additional photon capture and enhance the LHCII excitation through plasmon-induced resonance energy transfer. This plasmonic effect facilitates the charge separation at LHCII/TiO2 interface, leading to a clear enhancement of photocurrent generation in LHCII-sensitized solar cells with the incorporated PNPs.

[Full Paper]
Yiqun Yang, Habtom B. Gobeze, Francis D'Souza, Ryszard Jankowiak, Jun Li
Adv. Mater. Interfaces, June 28, 2016, DOI: 10.1002/admi.201600371. Read article

Boosting Organic Solar Cell Electrical Performance by Introducing Large Aromatics onto Small-Molecule Peripheral Side-Chains

Boosting Organic Solar Cell Electrical Performance by Introducing Large Aromatics onto Small‐Molecule Peripheral Side‐Chains

Relative size of conjugation systems on lateral side-chains relative to that on the mainchain of a small molecule donor is found to be a structural factor that effectively tunes donor phase size and molecular crystallinity, and consequently on small-molecule organic solar cell performance.

[Full Paper]
Xinliang Zhang, Jiannian Yao, Chuanlang Zhan
Adv. Mater. Interfaces, June 28, 2016, DOI: 10.1002/admi.201600323. Read article

Bulk-Heterojunction Organic Solar Cells: Five Core Technologies for Their Commercialization

Bulk‐Heterojunction Organic Solar Cells: Five Core Technologies for Their Commercialization

Bulk-heterojunction organic solar cells based on solution-processable organic semiconductors enable completely new functionalities of being printable, portable, wearable, biocompatible, and attachable to any curved surfaces. The recent major advances in device efficiency and stability, flexible transparent electrodes, module design, and printing technologies for their commercialization are reviewed. The existing challenges and perspectives for these five core technologies are discussed.

[Review]
Hongkyu Kang, Geunjin Kim, Junghwan Kim, Sooncheol Kwon, Heejoo Kim, Kwanghee Lee
Adv. Mater., June 27, 2016, DOI: 10.1002/adma.201601197. Read article

Characterizing Electric Field Exposed P3HT Thin Films Using Polarized-Light Spectroscopies

Characterizing Electric Field Exposed P3HT Thin Films Using Polarized‐Light Spectroscopies

A simple method of orienting poly (3-hexylthiophene) (P3HT) polymers under a unipolar electrostatic field generated by a Van de Graaff dome is reported. Previous uses of electric field are limited to P3HT nanofibers and in microscopic channels. Excitation anisotropy is used to determine the orientation of P3HT which is corroborated by Polarized Raman and hole mobility measurements.

[Full Paper]
Ujjal Bhattacharjee, Moneim Elshobaki, Kalyan Santra, Jonathan M. Bobbitt, Sumit Chaudhary, Emily A. Smith, Jacob W. Petrich
Macromol. Chem. Phys., June 23, 2016, DOI: 10.1002/macp.201600113. Read article

Alloy Acceptor: Superior Alternative to PCBM toward Efficient and Stable Organic Solar Cells

Alloy Acceptor: Superior Alternative to PCBM toward Efficient and Stable Organic Solar Cells

The alloy acceptor (indene-C60 bis-adduct (ICBA)/[6,6]-phenyl-C71-butyric acid-methyl-ester (PC71BM)) is employed to replace the widely used fullerene acceptor (PC71BM) in organic solar cells based on five different polymer donors, which exhibits a higher efficiency and much better device stability than the PC71BM counterpart.

[Communication]
Pei Cheng, Cenqi Yan, Yang Wu, Jiayu Wang, Meng Qin, Qiaoshi An, Jiamin Cao, Lijun Huo, Fujun Zhang, Liming Ding, Yanming Sun, Wei Ma, Xiaowei Zhan
Adv. Mater., June 23, 2016, DOI: 10.1002/adma.201602067. Read article

Impact of the Nature of the Side-Chains on the Polymer-Fullerene Packing in the Mixed Regions of Bulk Heterojunction Solar Cells

Impact of the Nature of the Side‐Chains on the Polymer‐Fullerene Packing in the Mixed Regions of Bulk Heterojunction Solar Cells

Polymer side-chains are expected to play a significant role in determining the polymer-fullerene packing in the mixed regions of bulk-heterojunction solar cells. The computational work, based on a combination of molecular dynamics simulations and density functional theory calculations, provides a detailed description of the impact that the nature and locations of the polymer side-chains have on the nanoscale polymer-fullerene packing.

[Full Paper]
Tonghui Wang, Mahesh Kumar Ravva, Jean-Luc Brédas
Adv. Funct. Mater., June 20, 2016, DOI: 10.1002/adfm.201601134. Read article

Fullerene-Free Polymer Solar Cells with Open-Circuit Voltage above 1.2 V: Tuning Phase Separation Behavior with Oligomer to Replace Polymer Acceptor

Fullerene‐Free Polymer Solar Cells with Open‐Circuit Voltage above 1.2 V: Tuning Phase Separation Behavior with Oligomer to Replace Polymer Acceptor

A well-defined oligomer F4TBT4 is proposed to replace its polymer PFTBT as electron acceptor to fabricate fullerene-free polymer solar cells. The oligomer acceptor favors to construct pure and large-scale phase separation in polymer blend film due to decreased chain entanglement. The resulted P3HT:F4TBT4 solar cells not only output a high VOC above 1.2 V, but also achieve a PCE of 4.12%.

[Full Paper]
Yingying Fu, Bei Wang, Jianfei Qu, Yang Wu, Wei Ma, Yanhou Geng, Yanchun Han, Zhiyuan Xie
Adv. Funct. Mater., June 17, 2016, DOI: 10.1002/adfm.201601880. Read article

High-Performance Polymer Solar Cells with PCE of 10.42% via Al-Doped ZnO Cathode Interlayer

High‐Performance Polymer Solar Cells with PCE of 10.42% via Al‐Doped ZnO Cathode Interlayer

High performance polymer solar cells incorporating the low-temperature processed aluminum-doped zinc oxide (AZO) cathode interlayer are constructed with power conversion efficiency (PCE) of 10.42% based on PTB7-Th:PC71BM blends (insensitive to AZO thickness). Moreover, flexible devices on PET/ITO substrates with PCE of 8.93% are also obtained and well distributed efficiency and good device stability are demonstrated as well.

[Communication]
Xiaohui Liu, Xiaodong Li, Yaru Li, Changjian Song, Liping Zhu, Wenjun Zhang, Hai-Qiao Wang, Junfeng Fang
Adv. Mater., June 16, 2016, DOI: 10.1002/adma.201601814. Read article

Aqueous Solution Processed Photoconductive Cathode Interlayer for High Performance Polymer Solar Cells with Thick Interlayer and Thick Active Layer

Aqueous Solution Processed Photoconductive Cathode Interlayer for High Performance Polymer Solar Cells with Thick Interlayer and Thick Active Layer

An aqueous solution processed photoconductive cathode interlayer is developed, in which the photoinduced charge transfer brings multiple advantages such as increased conductivity and electron mobility as well as reduced work function. Average power conversion efficiency over 10% is achieved even when the thickness of the cathode interlayer and active layer is up to 100 and 300 nm, respectively.

[Communication]
Li Nian, Zhenhui Chen, Stefanie Herbst, Qingyuan Li, Chengzhuo Yu, Xiaofang Jiang, Huanli Dong, Fenghong Li, Linlin Liu, Frank Würthner, Junwu Chen, Zengqi Xie, Yuguang Ma
Adv. Mater., June 15, 2016, DOI: 10.1002/adma.201601615. Read article

Pyrite-Based Bi-Functional Layer for Long-Term Stability and High-Performance of Organo-Lead Halide Perovskite Solar Cells

Pyrite‐Based Bi‐Functional Layer for Long‐Term Stability and High‐Performance of Organo‐Lead Halide Perovskite Solar Cells

A bi-functional layer based on hydrophobic ligand capped FeS2 nanoparticles is an outstanding inorganic hole transporting materials (HTMs) for perovskite solar cells (PSCs). PSCs with FeS2 bi-functional layer show high photovoltaic performance and improved long-term stability because HTMs based on FeS2 have excellent hole transport ability and moisture-proof performance. Our approach will contribute to reliability improvement of PSCs.

[Full Paper]
Bonkee Koo, Heesuk Jung, Minwoo Park, Jae-Yup Kim, Hae Jung Son, Jinhan Cho, Min Jae Ko
Adv. Funct. Mater., June 09, 2016, DOI: 10.1002/adfm.201601119. Read article

Controlled Mutual Diffusion between Fullerene and Conjugated Polymer Nanopillars in Ordered Heterojunction Solar Cells

Controlled Mutual Diffusion between Fullerene and Conjugated Polymer Nanopillars in Ordered Heterojunction Solar Cells

With controlled mutual diffusion of donor and acceptor molecules on well-defined nanointerdigitated donor–acceptor pillar structure, quasi-bulk heterojunction pillars are formed in large area. The pillar nanostructures are effectively controlled by varying the thermal annealing conditions, showing nano- to macroscale structural and electrical properties easily monitored by grazing-incidence X-ray scattering, and scanning force microscopy.

[Full Paper]
Jongkuk Ko, Jiyun Song, Hyunsik Yoon, Taeyong Kim, Changhee Lee, Rüdiger Berger, Kookheon Char
Adv. Mater. Interfaces, June 06, 2016, DOI: 10.1002/admi.201600264. Read article

Determination of Interfacial Charge-Transfer Rate Constants in Perovskite Solar Cells

Determination of Interfacial Charge‐Transfer Rate Constants in Perovskite Solar Cells

Moments in time: A simple protocol to study the dynamics of charge transfer to selective contacts in perovskite solar cells, based on time-resolved laser spectroscopy studies, in which the effect of bimolecular electron–hole recombination has been eliminated, is proposed.

[Full Paper]
Katarzyna Pydzińska, Jerzy Karolczak, Ivet Kosta, Ramon Tena-Zaera, Anna Todinova, Jesus Idígoras, Juan A. Anta, Marcin Ziółek
ChemSusChem, June 02, 2016, DOI: 10.1002/cssc.201600210. Read article

Naphthalenediimide-alt-Fused-Thiophene D-A Copolymers for the Application as Acceptor in All-Polymer Solar Cells

Three n-type alternating D-A copolymers based on naphthalenediimide (NDI) acceptor (A) unit and three different donor (D) units with varied electron-donating strength including thiophene (P(NDI-T)), thieno[3,2-b]thiophene (P(NDI-TT)), and thieno[3,2-b;4,5-b]dithiophene (P(NDI-TDT)), were synthesized, for the application as acceptor materials in all-polymer solar cells (all-PSCs). The effect of the donor units of thiophene, thienothiophene (TT) and thienodithiophene (TDT) on the physicochemical and photovoltaic properties of the n-type D-A copolymers were investigated systematically. It was found that the absorption spectrum is red-shifted and the energy bandgap (Eg) is reduced for the NDI-based D-A copolymers with the increase of the number of thiophene rings in the thiophene or fused thiophene donor units. All-PSCs were fabricated with a medium band gap conjugated polymer J51 (Eg of ca 1.9 eV) as polymer donor and the n-type D-A copolymers as acceptor. The power conversion efficiency reached 2.59%, 3.70% and 5.10% for the all-PSCs with P(NDI-T), P(NDI-TT) and P(NDI-TDT) as acceptor, respectively. The results indicate that the larger conjugated fused molecular plane with more thiophene rings as donor units in the NDI-based D-A copolymers will benefit to reduce the bandgap, broaden the absorption and enhance the photovoltaic performance of the n-type D-A copolymer acceptors.

[Full Paper]
Yongfang Li, Lingwei Xue, Yankang Yang, Zhi-Guo Zhang, Jing Zhang, Liang Gao, Haijun Bin, Yun Xu Yang
Chem. Asian J., June 02, 2016, DOI: 10.1002/asia.201600450. Read article

Understanding Solvent Manipulation of Morphology in Bulk-Heterojunction Organic Solar Cells

Understanding Solvent Manipulation of Morphology in Bulk‐Heterojunction Organic Solar Cells

The shape of things to come: Film morphology greatly influences the performance of bulk-heterojunction (BHJ)-structure-based solar cells. The control of the morphology of BHJ devices has been a major focus of research efforts over the last decade. Four solvent-related methods, including solvent selection, solvent mixing, solvent vapor annealing, and solvent soaking can efficiently control the morphology of BHJ films and are reviewed herein.

[Focus Review]
Yuxia Chen, Chuanlang Zhan, Jiannian Yao
Chem. Asian J., June 02, 2016, DOI: 10.1002/asia.201600374. Read article

Improved All-Polymer Solar Cell Performance by Using Matched Polymer Acceptor

Improved All‐Polymer Solar Cell Performance by Using Matched Polymer Acceptor

By incorporating different building blocks and modifying side-chains, a series of donor–acceptor polymers have been successfully synthesized. Optimized all-polymer solar cells have been demonstrated a high power conversion efficiency of 6.0%. The improved device performance may be attributed to the resemble crystallinity of the donor/acceptor polymers, which can lead to the balanced charge transfer and transport.

[Full Paper]
Shaohua Shi, Jianyu Yuan, Guanqun Ding, Michael Ford, Kunyuan Lu, Guozheng Shi, Jianxia Sun, Xufeng Ling, Yong Li, Wanli Ma
Adv. Funct. Mater., June 01, 2016, DOI: 10.1002/adfm.201601037. Read article

Development of Photovoltaic Devices Based on Near Infrared Quantum Dots and Conjugated Polymers

Development of Photovoltaic Devices Based on Near Infrared Quantum Dots and Conjugated Polymers

Rational combination of near infrared quantum dots (NIR QDs) and conjugated polymers into inorganic–organic hybrid photovoltaic devices can in principle merge the respective advantages of polymers and inorganic nanomaterials in light absorption, mechanical flexibility, specific weight, and photostability. This provides ample area for developing high-efficiency NIR QDs-polymer solar cells.

[Focus Review]
Long Tan, Pandeng Li, Baoquan Sun, Mohamed Chaker, Dongling Ma
ChemNanoMat, May 30, 2016, DOI: 10.1002/cnma.201600103. Read article

Moisture and Oxygen Enhance Conductivity of LiTFSI-Doped Spiro-MeOTAD Hole Transport Layer in Perovskite Solar Cells

Moisture and Oxygen Enhance Conductivity of LiTFSI‐Doped Spiro‐MeOTAD Hole Transport Layer in Perovskite Solar Cells

Moisture is necessary to enhance the conductivity of LiTFSI-doped, hole transport layers. Photoemission spectroscopy (PES) and Hg-drop current–voltage measurements are used to study the effects of H2O vapor, dry O2, and ambient air on Li-bis(trifluoromethanesulfonyl)-imide (LiTFSI)-doped, spiro-MeOTAD. PES shows that humidity is the component of air that causes LiTFSI dopants to redistribute across spiro-MeOTAD films, leading to an enhanced conductivity.

[Communication]
Zafer Hawash, Luis K. Ono, Yabing Qi
Adv. Mater. Interfaces, May 27, 2016, DOI: 10.1002/admi.201600117. Read article

Effect of Fluorine Substitution on the Charge Carrier Dynamics of Benzothiadiazole-Based Solar Cell Materials

Effect of Fluorine Substitution on the Charge Carrier Dynamics of Benzothiadiazole‐Based Solar Cell Materials

The charge carrier dynamics of benzothiadiazole-based conjugated polymer, named PBT, as well as of its fluorinated analogues, PFBT and PDFBT, are investigated by femtosecond transient absorption (TA) spectroscopy. In addition, bulk heterojunctions containing both each copolymer and fullerene derivative are also analyzed using the TA measurement.

[Communication]
In-Sik Kim, In-Bok Kim, Dong-Yu Kim, Seong-Hoon Kwon, Do-Kyeong Ko
Macromol. Rapid Commun., May 25, 2016, DOI: 10.1002/marc.201600197. Read article

Dependence of Excited-State Properties of a Low-Bandgap Photovoltaic Copolymer on Side-Chain Substitution and Solvent

Dependence of Excited‐State Properties of a Low‐Bandgap Photovoltaic Copolymer on Side‐Chain Substitution and Solvent

Structure–property relationships: A photovoltaic donor–acceptor copolymer that contains meta-alkoxyphenyl groups is studied using spectroscopy and quantum chemical calculations to provide information on the charge photogeneration dynamics. The alkoxyphenyl substituent impacts the triplet formation and main chain conformation directly.

[Full Paper]
Ning-Jiu Zhao, Mao-Jie Zhang, Ran Liang, Li-Min Fu, Wei Zhang, Xi-Cheng Ai, Jian-Hui Hou, Jian-Ping Zhang
ChemSusChem, May 25, 2016, DOI: 10.1002/cssc.201501690. Read article

Al-density variation as one driving force for void formation in PERC solar cells

Al‐density variation as one driving force for void formation in PERC solar cells

In this Letter, void formation in passivated emitter and rear contact (PERC) solar cells is traced back to density variation of the Al-melt during the contact formation process. Based on additional experimental results some of the established theses are questioned and a new working hypothesis concerning void formation is elaborated.

[rrl solar]
Renate Horbelt, Stefanie Ebert, Vaidvile Ulbikaite, Giso Hahn, Reinhart Job, Barbara Terheiden
Phys. Status Solidi RRL, May 23, 2016, DOI: 10.1002/pssr.201600078. Read article

Mixed-Halide CH3NH3PbI3−xXx (X=Cl, Br, I) Perovskites: Vapor-Assisted Solution Deposition and Application as Solar Cell Absorbers

Mixed‐Halide CH3NH3PbI3−xXx (X=Cl, Br, I) Perovskites: Vapor‐Assisted Solution Deposition and Application as Solar Cell Absorbers

In a puff of gas: Perovskite films are synthesized by exposing PbI2 film to CH3NH3X (X=I, Br or Cl) vapor. Inclusion of Cl or Br into the structure leads to smaller grains and lower surface roughness (see figure). An efficiency of 13 % can be achieved by a solar cell fabricated with CH3NH3PbI3 outside the glove box under ambient conditions. The efficiency is lower for CH3NH3PbI3−xClx (11 %) and CH3NH3PbI3−xBrx (10 %), whereas the VOC values are larger for these devices.

[Article]
Rahime Sedighi, Fariba Tajabadi, Saeed Shahbazi, Somayeh Gholipour, Nima Taghavinia
ChemPhysChem, May 19, 2016, DOI: 10.1002/cphc.201600230. Read article

Synthesis and Optoelectronic Properties of Benzo[1,2-b:4,5-b′]dithiophene-Based Copolymers with Conjugated 2-(2-Ethylhexyl)-3,4-dimethoxythiophene Side Chains

Synthesis and Optoelectronic Properties of Benzo[1,2‐b:4,5‐b′]dithiophene‐Based Copolymers with Conjugated 2‐(2‐Ethylhexyl)‐3,4‐dimethoxythiophene Side Chains

To further tailor the structural and electronic properties of benzo[1,2-b:4,5-b′]­dithiophene (BDT) unit, a new BDT-based donor unit (named as BDTOT) featuring two 2-(2-ethylhexyl)-3,4-dimethoxythiophene groups attached onto the BDT backbone and the related D-A copolymers (PBDTOT-FBT, PBDTOT-BT, and PBDTOT-DPP) based on BDTOT are developed for polymer solar cell (PSC) applications.

[Full Paper]
Wengong Wang, Lixia Chen, Guo Wang, Zhi-Guo Zhang, Yongfang Li, Ping Shen
Macromol. Chem. Phys., May 18, 2016, DOI: 10.1002/macp.201600076. Read article

Broad Bandgap D–A Copolymer Based on Bithiazole Acceptor Unit for Application in High-Performance Polymer Solar Cells with Lower Fullerene Content

Broad Bandgap D–A Copolymer Based on Bithiazole Acceptor Unit for Application in High‐Performance Polymer Solar Cells with Lower Fullerene Content

Broad bandgap 2D-conjugated D–A copolymer, PBDTBTz-T, based on bithienyl-benzodithiophene donor unit and bithiazole acceptor unit were synthesized. The power conversion efficiency of the PSCs based on PBDTBTz-T as polymer donor and a low PC71BM acceptor content of 40% reaches 6.09% with a high Voc of 0.92 V.

[Communication]
Kun Wang, Xia Guo, Bing Guo, Wanbin Li, Maojie Zhang, Yongfang Li
Macromol. Rapid Commun., May 13, 2016, DOI: 10.1002/marc.201600115. Read article

New Horizons for Perovskite Solar Cells Employing DNA-CTMA as the Hole-Transporting Material

New Horizons for Perovskite Solar Cells Employing DNA‐CTMA as the Hole‐Transporting Material

Bio-derived stability: Deoxyribose nucleic acid (DNA)–hexadecyl trimethyl ammonium chloride (CTMA) as the hole-transport layer in perovskite solar cells shows enhanced device efficiency as well as improved lifetime based on a p–i–n device structure. DNA-based devices exhibit device efficiency over 15 % higher than that of the perovskite solar cells constructed with poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and maintained above 85 % of their initial efficiency after 50 days in air.

[Full Paper]
Abd. Rashid bin Mohd Yusoff, Jeongmo Kim, Jin Jang, Mohammad Khaja Nazeeruddin
ChemSusChem, May 11, 2016, DOI: 10.1002/cssc.201600288. Read article

Fine Control of Side Chains in Random π-Conjugated Terpolymers for Organic Photovoltaics

Fine Control of Side Chains in Random π‐Conjugated Terpolymers for Organic Photovoltaics

A set of random terpolymers is designed in such a way that only one donor unit possesses soluble side-chains, enabling a fine control of the influences of side-chain numbers on their solubility, optical absorption, energy levels, and solid-state packing.

[Full Paper]
Jialin Wang, Lingqiang Kong, Ziqi Liang
Macromol. Chem. Phys., May 06, 2016, DOI: 10.1002/macp.201600072. Read article

Effectively Improving Extinction Coefficient of Benzodithiophene and Benzodithiophenedione-based Photovoltaic Polymer by Grafting Alkylthio Functional Groups

Effectively Improving Extinction Coefficient of Benzodithiophene and Benzodithiophenedione‐based Photovoltaic Polymer by Grafting Alkylthio Functional Groups

What a difference an S makes: Alkylthio substitution on the conjugated thiophene side chains in benzodithiophene (BDT) and benzodithiophenedione (BDD)-based photovoltaic polymer can effectively improve the extinction coefficient. The higher extinction coefficient of PBD-S results in higher external quantum efficiencies (EQE) and power conversion efficiency (PCE) in its corresponding polymer solar cells.

[Communication]
Qi Wang, Shaoqing Zhang, Bowei Xu, Long Ye, Huifeng Yao, Yong Cui, Hao Zhang, Wenxia Yuan, Jianhui Hou
Chem. Asian J., February 02, 2016, DOI: 10.1002/asia.201501387. Read article

Visible-Light-Driven Water Oxidation on a Photoanode by Supramolecular Assembly of Photosensitizer and Catalyst

Visible‐Light‐Driven Water Oxidation on a Photoanode by Supramolecular Assembly of Photosensitizer and Catalyst

A “take-charge” guest: A ruthenium water oxidation catalyst was incorporated on the surface of a dye-sensitized nanostructured TiO2 film when it formed a host–guest adduct with the chromophore, providing a new strategy for photoanode construction.

[Communication]
Hua Li, Fei Li, Yong Wang, Lichen Bai, Fengshou Yu, Licheng Sun
ChemPlusChem, January 28, 2016, DOI: 10.1002/cplu.201500539. Read article

Synthesis and Characterization of Phenothiazine-Based Platinum(II)–Acetylide Photosensitizers for Efficient Dye-Sensitized Solar Cells

Synthesis and Characterization of Phenothiazine-Based Platinum(II)–Acetylide Photosensitizers for Efficient Dye-Sensitized Solar Cells

An attractive power conversion efficiency (η) of up to 5.78 %, a short-circuit photocurrent density of 10.98 mA cm−2, an open-circuit photovoltage of 0.738 V, and a fill factor of 0.713 are displayed by the newly synthesized PT1-based dye-sensitized solar cell (DSSC) device. These findings provide strong evidence that platinum–acetylide complexes have great potential as promising photosensitizers in DSSC applications.

[Full Paper]
Chi-Ho Siu, Lawrence Tien Lin Lee, Sze-Chun Yiu, Po-Yu Ho, Panwang Zhou, Cheuk-Lam Ho, Tao Chen, Jianrong Liu, Keli Han, Wai-Yeung Wong
Chem. Eur. J., December 11, 2015, DOI: 10.1002/chem.201503828. Read article.

Color Bricks: Building Highly Organized and Strongly Absorbing Multicomponent Arrays of Terpyridyl Perylenes on Metal Oxide Surfaces

Color Bricks: Building Highly Organized and Strongly Absorbing Multicomponent Arrays of Terpyridyl Perylenes on Metal Oxide Surfaces

Socket and linker: Terpyridine-substituted perylenes containing cyclic anhydrides were assembled as monomolecular layers on metal oxide surfaces. Bis(terpyridyl) perylene diimides were used as linkers to build supramolecular assemblies by coordination with Zn2+ ions (see figure). With proper selection of the anchor and linker highly stable, deeply colored, multilayer structures with greater than ten successive layers were prepared.

[Full Paper]
Essi Sariola-Leikas, Zafar Ahmed, Paola Vivo, Anniina Ojanperä, Kimmo Lahtonen, Jesse Saari, Mika Valden, Helge Lemmetyinen, Alexander Efimov
Chem. Eur. J., December 3, 2015, DOI: 10.1002/chem.201503738. Read article.

Azafullerene C59N in Donor–Acceptor Dyads: Synthetic Approaches and Properties

Azafullerene C59N in Donor–Acceptor Dyads: Synthetic Approaches and Properties

Energy conversion schemes: Donor–acceptor systems based on the azafullerene C59N are reviewed. While focusing on the synthetic strategies, the properties of systems employing this azafullerene as electron or energy acceptor are also presented, unfolding both the synthetic access as well as the unique electronic properties of these systems. Both in dyads in solution as well as in solar cell devices, C59N is revealed as a promising acceptor for energy conversion schemes.

[Minireview]
Georgios Rotas, Nikos Tagmatarchis
Chem. Eur. J., November 26, 2015, DOI: 10.1002/chem.201502190. Read article.

Understanding the External Quantum Efficiency of Organic Homo-Tandem Solar Cells Utilizing a Three-Terminal Device Architecture

Thumbnail image of graphical abstract

A three-terminal tandem solar cell architecture enables detailed studies of the external quantum efficiencies (EQEs) of organic homo-tandem solar cells. Due to optoelectronic equality, all results can be transferred to conventional two-terminal tandem cells including a detailed study of subcell saturation by monochromatic bias light and bias voltage needed for accurate EQE measurements.

[Full Paper]
Daniel Bahro, Manuel Koppitz, Adrian Mertens, Konstantin Glaser, Jan Mescher, Alexander Colsmann
Adv. Energy Mater., August 26, 2015, DOI: 10.1002/aenm.201501019. Read article

Thin-Film Solar Cells with InP Absorber Layers Directly Grown on Nonepitaxial Metal Substrates

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The design and performance of solar cells based on InP grown by the nonepitaxial thin-film vapor–liquid–solid growth technique is investigated. The cell structure consists of a Mo back contact, p-InP absorber layer, n-TiO2 electron selective contact, and indium tin oxide transparent top electrode. The highest measured open circuit voltage (VOC) under 1 sun is 692 mV, which approaches the optically implied VOC of ≈795 mV extracted from the luminescence yield of p-InP.

[Full Paper]
Maxwell Zheng, Hsin-Ping Wang, Carolin M. Sutter-Fella, Corsin Battaglia, Shaul Aloni, Xufeng Wang, James Moore, Jeffrey W. Beeman, Mark Hettick, Matin Amani, Wei-Tse Hsu, Joel W. Ager, Peter Bermel, Mark Lundstrom, Jr-Hau He, Ali Javey
Adv. Energy Mater., August 25, 2015, DOI: 10.1002/aenm.201501337. Read article

Water Ingress in Encapsulated Inverted Organic Solar Cells: Correlating Infrared Imaging and Photovoltaic Performance

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Lifetime limitations of current-generation inverted and encapsulated organic solar cells under damp heat conditions are identified by correlating photovoltaic device performance with lock-in IR imaging techniques. The combination of electroluminescence imaging and water diffusion modeling may inform strategies for predicting early performance losses in solar cells and modules.

[Full Paper]
Jens Adams, Michael Salvador, Luca Lucera, Stefan Langner, George D. Spyropoulos, Frank W. Fecher, Monika M. Voigt, Simon A. Dowland, Andres Osvet, Hans-Joachim Egelhaaf, Christoph J. Brabec
Adv. Energy Mater., August 12, 2015, DOI: 10.1002/aenm.201501065. Read article

Large Efficiency Improvement in Cu2ZnSnSe4 Solar Cells by Introducing a Superficial Ge Nanolayer

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A large improvement of Cu2ZnSnSe4 solar cell efficiency is presented based on the introduction of a Ge superficial nanolayer. This improvement is explained by three complementary effects: the formation of a liquid Ge-related phase, the possible reduction of Sn multicharge states, and the formation of GeOx nanoinclusions, which lead to an impressive solar cell (VOC) increase.

[Communication]
Sergio Giraldo, Markus Neuschitzer, Thomas Thersleff, Simón López-Marino, Yudania Sánchez, Haibing Xie, Mónica Colina, Marcel Placidi, Paul Pistor, Victor Izquierdo-Roca, Klaus Leifer, Alejandro Pérez-Rodríguez, Edgardo Saucedo
Adv. Energy Mater., August 07, 2015, DOI: 10.1002/aenm.201501070. Read article

Light-Induced Self-Poling Effect on Organometal Trihalide Perovskite Solar Cells for Increased Device Efficiency and Stability

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Continuous illumination of the organometal trihalide perovskite (OTP) devices can cause the photovoltaic poling effect, termed light-induced self-poling (LISP), which improves the stabilized device efficiency significantly. The effect of LISP is comparable to the poling by an externally applied electric field, which can be explained by the redistribution of ions/vacancies within the OTP layers driven by photovoltage-induced additional electric field.

[Communication]
Yehao Deng, Zhengguo Xiao, Jinsong Huang
Adv. Energy Mater., August 07, 2015, DOI: 10.1002/aenm.201500721. Read article

High-Performance Flexible Nanostructured Silicon Solar Modules with Plasmonically Engineered Upconversion Medium

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Plasmonically enhanced upconverion luminescence is exploited to improve the collection efficiency of above-bandgap, long-wavelength photons in ultrathin nanostructured silicon solar microcells. A composite solar module integrated with plasmonic silver nanostructures and upconversion printing medium enables the performance enhancement of surface-embedded 8 μm thick nanostructured silicon microcells by synergistic effects of plasmonically enhanced spectral upconversion, waveguiding, and fluorescence of upconversion nanocrystals.

[Full Paper]
Sung-Min Lee, Weigu Li, Purnim Dhar, Sergey Malyk, Yu Wang, Wonmok Lee, Alexander Benderskii, Jongseung Yoon
Adv. Energy Mater., August 03, 2015, DOI: 10.1002/aenm.201500761. Read article

Chemical Consequences of Alkali Inhomogeneity in Cu2ZnSnS4 Thin-Film Solar Cells

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Cu2ZnSnS4-based solar cells lacking an alkali diffusion barrier contain a non-uniform distribution of Na in the absorber layer. Samples containing Na “hot spots” have corresponding light beam induced current hot spots on comparable length scales. Na hot spots are also correlated with increased Cu in-diffusion with the underlying MoS2 layer and decreased diffusion of Cd to the back contact.

[Full Paper]
Talia Gershon, Cayla Hamann, Marinus Hopstaken, Yun Seog Lee, Byungha Shin, Richard Haight
Adv. Energy Mater., July 27, 2015, DOI: 10.1002/aenm.201500922. Read article

Diketopyrrolopyrroles with a Distinct Energy Level Cascade for Efficient Charge Carrier Generation in Organic Solar Cells

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Tailored low molecular weight diketopyrrolopyrrole compounds with a precise energy level offset are synthesized by tuning the electron deficiency on the terminal aryl unit. Application of these compounds in cascade solar cells in combination with C60 leads to drastically increased short-circuit current densities and power conversion efficiencies.

[Full Paper]
Christian J. Mueller, Michael Brendel, Pia Ruckdeschel, Jens Pflaum, Mukundan Thelakkat
Adv. Energy Mater., July 27, 2015, DOI: 10.1002/aenm.201500914. Read article

Charge Accumulation and Hysteresis in Perovskite-Based Solar Cells: An Electro-Optical Analysis

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Electric-field and charge accumulation-induced perovskite structure response are used to explain the hysteresis and ultraslow dynamics in CH3NH3PbI3 (MAPbI3) perovskite-based solar cells. The charge transfer efficiency at perovskite interfaces is found to be significant in determining the severity of the hysteresis in perovskite photovoltaic devices. The interface between perovskite and TiO­2 should be modified to minimize the hysteresis.

[Full Paper]
Bo Wu, Kunwu Fu, Natalia Yantara, Guichuan Xing, Shuangyong Sun, Tze Chien Sum, Nripan Mathews
Adv. Energy Mater., July 27, 2015, DOI: 10.1002/aenm.201500829. Read article

A Comparative Study of the Effects of Nontoxic Chloride Treatments on CdTe Solar Cell Microstructure and Stoichiometry

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The effectiveness of various chlorides for activating CdTe solar cells is explored, in view of replacing the highly toxic CdCl2. It is shown that the chosen chloride must have a low dissociation energy (<4 eV) in order to catalyze the necessary metallurgical and stoichiometric changes. Significant insight into the Cl-activation mechanism is gained from the results.

[Full Paper]
Benjamin L. Williams, Jonathan D. Major, Leon Bowen, Wytze Keuning, Mariadriana Creatore, Ken Durose
Adv. Energy Mater., July 27, 2015, DOI: 10.1002/aenm.201500554. Read article

Significance of Average Domain Purity and Mixed Domains on the Photovoltaic Performance of High-Efficiency Solution-Processed Small-Molecule BHJ Solar Cells

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Resonant soft X-ray scattering reveals a correlation between average domain purity and device fill-factor for an efficient solution processed small molecule 7,7′-(4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b′]dithiophene-2,6-diyl)bis(6-fluoro-4-(5′-hexyl-[2,2′-bithiophen]-5-yl)benzo[c][1,2,5]thiadiazole):phenyl-C71-butyric acid methyl ester (p-DTS(FBTTh2)2:PC71BM) system. The results show the requirement of optimal combination of phase purities to diminish bimolecular as well as geminate recombination.

[Full Paper]
Subhrangsu Mukherjee, Christopher M. Proctor, Guillermo C. Bazan, Thuc-Quyen Nguyen, Harald Ade
Adv. Energy Mater., July 20, 2015, DOI: 10.1002/aenm.201500877. Read article

11.2% Efficient Solution Processed Kesterite Solar Cell with a Low Voltage Deficit

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An 11.2% efficient kesterite solar cell is fabricated with a open circuit voltage (Voc ) deficit of only 0.57 V, possible by employing the three-stage annealing process. The reduced Voc deficit goes along with an increased minority carrier lifetime, low diode saturation current, and ideality factor, which are signatures of the semiconductor material with a low concentration of recombination centers.

[Communication]
Stefan G. Haass, Matthias Diethelm, Melanie Werner, Benjamin Bissig, Yaroslav E. Romanyuk, Ayodhya N. Tiwari
Adv. Energy Mater., July 17, 2015, DOI: 10.1002/aenm.201500712. Read article

Carrier-Selectivity-Dependent Charge Recombination Dynamics in Organic Photovoltaic Cells with a Ferroelectric Blend Interlayer

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The carrier selectivity at charge collecting interfaces in organic solar cells is demonstrated through the utilization of ferroelectric–semiconductor blend interlayers. Transient electrical measurements reveal the elongated charge carrier lifetime within devices with highly charge-selective contacts, which is well correlated with the asymmetric development of charge carrier density profiles in the photo­active layers.

[Full Paper]
Sae Byeok Jo, Min Kim, Dong Hun Sin, Jaewon Lee, Heung Gyu Kim, Hyomin Ko, Kilwon Cho
Adv. Energy Mater., July 15, 2015, DOI: 10.1002/aenm.201500802. Read article

Synergistic Impact of Solvent and Polymer Additives on the Film Formation of Small Molecule Blend Films for Bulk Heterojunction Solar Cells

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In situ measurement shows that polystyrene (PS) and diiodooctane (DIO) additives promote donor crystallite formation synergistically, on different time scales and through different mechanisms. PS-rich films retain solvent, promoting phase separation early in the casting process. Meanwhile, the low vapor pressure of DIO extends the time scale of film evolution and allows for crystalline rearrangement of the donor phase after casting.

[Full Paper]
Caitlin McDowell, Maged Abdelsamie, Kui Zhao, Detlef-M. Smilgies, Guillermo C. Bazan, Aram Amassian
Adv. Energy Mater., July 14, 2015, DOI: 10.1002/aenm.201501121. Read article

Similar or Totally Different: the Adjustment of the Twist Conformation Through Minor Structural Modification, and Dramatically Improved Performance for Dye-Sensitized Solar Cell

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The sensitizer configuration of the acceptor and anchoring group affects electron injection and recombination in the corresponding dye-sensitized solar cells. The partial broken conjugation shows an efficient approach to enhancing photovoltaic performance after a systematical investigation of seven similar-looking sensitizers.

[Full Paper]
Zhaofei Chai, Mei Wu, Manman Fang, Sushu Wan, Ting Xu, Runli Tang, Yujun Xie, Anyi Mei, Hongwei Han, Qianqian Li, Zhen Li
Adv. Energy Mater., July 14, 2015, DOI: 10.1002/aenm.201500846. Read article

Control of Charge Dynamics via Use of Nonionic Phosphonate Chains and Their Effectiveness for Inverted Structure Solar Cells

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Nonionic phosphonate side chains are introduced into an isoindigo-based model polymer in order to induce a high compatibility at hybrid organic/inorganic interfaces, while controlling charge transport/collection and recombination dynamics in inverted polymer solar cells. This approach can bring ≈20% improvement in efficiency when compared to a nonmodified control analog.

[Full Paper]
Gyoungsik Kim, Seyeong Song, Jungho Lee, Taehyo Kim, Tack Ho Lee, Bright Walker, Jin Young Kim, Changduk Yang
Adv. Energy Mater., July 14, 2015, DOI: 10.1002/aenm.201500844. Read article

Cation Substitution of Solution-Processed Cu2ZnSnS4 Thin Film Solar Cell with over 9% Efficiency

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9.2%-efficiency Cu2ZnSnS4 (CZTS)-based pure sulfide thin film solar cells are fabricated by replacing partial Zn with Cd via low-cost sol–gel method. The appropriate incorporation of Cd into CZTS thin films can adjust band gaps, improve microstructure, and reduce the ZnS secondary phase in CZTS thin film, resulting in significant improvement of efficiencies.

[Full Paper]
Zhenghua Su, Joel Ming Rui Tan, Xianglin Li, Xin Zeng, Sudip Kumar Batabyal, Lydia Helena Wong
Adv. Energy Mater., July 14, 2015, DOI: 10.1002/aenm.201500682. Read article

High-Performance Semitransparent Perovskite Solar Cells with 10% Power Conversion Efficiency and 25% Average Visible Transmittance Based on Transparent CuSCN as the Hole-Transporting Material

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High-performance planar heterojunction perovskite (CH3NH3PbI3) solar cell (PVSC) is demonstrated by utilizing CuSCN as a hole-transporting layer. Efficient hole-transport and hole-extraction at the CuSCN/CH3NH3PbI3 interface facilitate the PVSCs to reach 16% power conversion efficiency (PCE). In addition, excellent transparency of CuSCN also enables high-performance semitransparent PVSC (10% PCE and 25% average visible transmittance) to be realized.

[Communication]
Jae Woong Jung, Chu-Chen Chueh, Alex K.-Y. Jen
Adv. Energy Mater., July 06, 2015, DOI: 10.1002/aenm.201500486. Read article

Highly Efficient Solution-Processed Poly(3,4-ethylenedio-xythiophene):Poly(styrenesulfonate)/Crystalline–Silicon Heterojunction Solar Cells with Improved Light-Induced Stability

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p-Toluenesulfonic acid/dimethyl sulfoxide (PTSA/DMSO)-treated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/crystalline-silicon (c-Si) hybrid solar cells with a solution-processed anti-reflection coating of TiO2 exhibit a record power conversion efficiency of 15.5%. Additionally, the performance stability of the hybrid device for both air storage and light exposure is improved due to removal of the PSS matrix from the PTSA/DMSO-treated PEDOT:PSS thin film.

[Communication]
Qiming Liu, Ryo Ishikawa, Shuji Funada, Tatsuya Ohki, Keiji Ueno, Hajime Shirai
Adv. Energy Mater., June 29, 2015, DOI: 10.1002/aenm.201500744. Read article

High-Performance Ta2O5/Al-Doped Ag Electrode for Resonant Light Harvesting in Efficient Organic Solar Cells

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A high-performance Ta2O5/Al-doped Ag electrode is presented by inserting a di­electric layer of Ta2O5 underneath ultrathin Al-doped Ag film. Such an Al-doped Ag can be as thin as 4 nm with excellent transparency. Fine light management by tuning the Ta2O5 thickness leads to enhancement of photocurrent and power conversion efficiency for the Ta2O5/Al-doped Ag-based organic solar cells due to the optical cavity effect, superior to their indium tin oxide counterparts.

[Full Paper]
Dewei Zhao, Cheng Zhang, Hyunsoo Kim, L. Jay Guo
Adv. Energy Mater., June 25, 2015, DOI: 10.1002/aenm.201500768. Read article

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