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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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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

Configuration-Dependent Electrically Tunable Van der Waals Heterostructures Based on MoTe2/MoS2

Configuration‐Dependent Electrically Tunable Van der Waals Heterostructures Based on MoTe2/MoS2

Using MoTe2/MoS2 as a typical example, the role of device configuration on the electronic and optoelectronic properties of van der Waals heterostructures is studied. It is found that the rectification behavior and open voltage are independent of the configuration. However, the drain currents, short circuit currents, and photoreponse performances strongly depend on the configuration used.

[Full Paper]
Feng Wang, Lei Yin, Zhen Xing Wang, Kai Xu, Feng Mei Wang, Tofik Ahmed Shifa, Yun Huang, Chao Jiang, Jun He
Adv. Funct. Mater., May 30, 2016, DOI: 10.1002/adfm.201601349. Read article

Multi-Length Scaled Silver Nanowire Grid for Application in Efficient Organic Solar Cells

Multi‐Length Scaled Silver Nanowire Grid for Application in Efficient Organic Solar Cells

Multi-length scaled silver nanowire (AgNW) grids are prepared as transparent conducting electrodes through a neutral vapor etching process. Organic solar cells with power conversion efficiency up to 9.02% are fabricated based on the multi-length scaled AgNW grids, which is higher than that based on original AgNW films and comparable to that based on indium tin oxide.

[Full Paper]
Jiang Wu, Xinglu Que, Qin Hu, Deying Luo, Tanghao Liu, Feng Liu, Thomas P. Russell, Rui Zhu, Qihuang Gong
Adv. Funct. Mater., May 27, 2016, DOI: 10.1002/adfm.201601049. Read article

Monitoring the Formation of a CH3NH3PbI3–xClx Perovskite during Thermal Annealing Using X-Ray Scattering

Monitoring the Formation of a CH3NH3PbI3–xClx Perovskite during Thermal Annealing Using X‐Ray Scattering

Crystallization of the perovskite CH3NH3PbI3–xClx during thermal annealing of a precursor film is studied using in situ grazing incidence wide angle and small angle X-ray scattering measurements. These results can explain the evolution of device performance with annealing time, and optimized films lead to solar cells with average power conversion efficiencies of over 12%.

[Full Paper]
Alexander T. Barrows, Samuele Lilliu, Andrew J. Pearson, David Babonneau, Alan D. F. Dunbar, David G. Lidzey
Adv. Funct. Mater., May 26, 2016, DOI: 10.1002/adfm.201601309. 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

Efficient All-Vacuum Deposited Perovskite Solar Cells by Controlling Reagent Partial Pressure in High Vacuum

Efficient All‐Vacuum Deposited Perovskite Solar Cells by Controlling Reagent Partial Pressure in High Vacuum

All-vacuum deposited perovskite solar cells produced by controlling reagent partial pressure in high vacuum with newly developed multi-layer electron and hole transporting structures show outstanding power conversion efficiency of 17.6% and smooth, pinhole-free, micrometer-sized perovskite crystal grains.

[Communication]
Sheng-Yi Hsiao, Hong-Lin Lin, Wei-Hung Lee, Wei-Lun Tsai, Kai-Ming Chiang, Wei-Yu Liao, Chen-Zheng Ren-Wu, Chien-Yu Chen, Hao-Wu Lin
Adv. Mater., May 25, 2016, DOI: 10.1002/adma.201601505. Read article

Weakly Conjugated Hybrid Zinc Porphyrin Sensitizers for Solid-State Dye-Sensitized Solar Cells

Weakly Conjugated Hybrid Zinc Porphyrin Sensitizers for Solid‐State Dye‐Sensitized Solar Cells

Two weakly conjugated hybrid zinc porphyrin molecules based on quinolizino acridine and triazatruxene fused amines are designed and synthesized as light harvester for solid-state dye-sensitized solar cells. After optimization, the new dye with triazatruxene based donor shows a power conversion efficiency of 5.1%, which is better than the earlier reported strongly conjugated porphyrin dyes.

[Full Paper]
Peng Qin, Paek Sanghyun, Mohammad Ibrahim Dar, Kasparas Rakstys, Hany ElBatal, Shaheen A. Al-Muhtaseb, Christian Ludwig, Mohammad Khaja Nazeeruddin
Adv. Funct. Mater., May 25, 2016, DOI: 10.1002/adfm.201601120. Read article

Nanostructured Si/Organic Heterojunction Solar Cells with High Open-Circuit Voltage via Improving Junction Quality

Nanostructured Si/Organic Heterojunction Solar Cells with High Open‐Circuit Voltage via Improving Junction Quality

The adhesion force between organics and nanostructured Si is dramatically improved by incorporating a silane chemical of 3-glycidoxypropyltrimethoxydsilane (GOPS) which chemically grafts organics on silicon. In addition, GOPS can passiviate dangling bond of Si surface. The improved contact between Si and organics via GOPS incorporation results in an open circuit voltage of 640 mV for nanostructured Si/organics heterojunction solar cells.

[Full Paper]
Shan Wu, Wei Cui, Nabi Aghdassi, Tao Song, Steffen Duhm, Shuit-Tong Lee, Baoquan Sun
Adv. Funct. Mater., May 25, 2016, DOI: 10.1002/adfm.201600441. Read article

Metal-Free Sensitizers Containing Hydantoin Acceptor as High Performance Anchoring Group for Dye-Sensitized Solar Cells

Metal‐Free Sensitizers Containing Hydantoin Acceptor as High Performance Anchoring Group for Dye‐Sensitized Solar Cells

The hydantoin acceptor is introduced into sensitizers as anchoring group and this acceptor indicates much higher electron-injection efficiency and short-circuit current. The hydantoin-based sensitizers show excellent durability and better performances than the traditional carboxyl anchoring group. The results indicate the potential of hydantoin as anchoring group to substitute the traditional carboxyl group for highly efficient dye-sensitized solar cells.

[Full Paper]
Fu-Ling Guo, Zhao-Qian Li, Xue-Peng Liu, Li Zhou, Fan-Tai Kong, Wang-Chao Chen, Song-Yuan Dai
Adv. Funct. Mater., May 24, 2016, DOI: 10.1002/adfm.201601305. 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

Easy Access to NO2-Containing Donor–Acceptor–Acceptor Electron Donors for High Efficiency Small-Molecule Organic Solar Cells

Easy Access to NO2‐Containing Donor–Acceptor–Acceptor Electron Donors for High Efficiency Small‐Molecule Organic Solar Cells

Building bridges! Phenylene- and thiophene-bridged donor–acceptor–acceptor (D–A–A) molecules are synthesized using a one-step coupling reaction. The molecules are used as electron donors for small-molecule organic solar cells, which displayed power conversion efficiencies exceeding 5 %.

[Full Paper]
Hao-Chun Ting, Ya-Ting Yang, Chia-Hsun Chen, Jiun-Haw Lee, Jung-Hung Chang, Chih-I Wu, Tien-Lung Chiu, Chi-Feng Lin, Chin-Lung Chung, Ken-Tsung Wong
ChemSusChem, May 23, 2016, DOI: 10.1002/cssc.201600361. Read article

Evaluation of Small Molecules as Front Cell Donor Materials for High-Efficiency Tandem Solar Cells

Evaluation of Small Molecules as Front Cell Donor Materials for High‐Efficiency Tandem Solar Cells

Three small molecules as front cell donors for tandem cells are thoroughly evaluated and a high power conversion efficiency of 11.47% is achieved, which demonstrates that the oligomer-like small molecules offer a good choice for high-performance tandem solar cells.

[Communication]
Qian Zhang, Xiangjian Wan, Feng Liu, Bin Kan, Miaomiao Li, Huanran Feng, Hongtao Zhang, Thomas P. Russell, Yongsheng Chen
Adv. Mater., May 23, 2016, DOI: 10.1002/adma.201601435. Read article

Dithienylthienothiophenebisimide, a Versatile Electron-Deficient Unit for Semiconducting Polymers

Dithienylthienothiophenebisimide, a Versatile Electron‐Deficient Unit for Semiconducting Polymers

A novel electron-deficient building unit, dithienylthienothiophenebisimide, and its polymers (PTBIs) are reported. Organic photovoltaic (OPV) cells based on PTBIs as p-type material exhibit 8.0% efficiencies with open-circuit voltages higher than 1 V. Interestingly, PTBIs also function as n-type material in OPVs depending on the molecular structure. These polymers also exhibit p-channel, n-channel, and ambipolar behaviors in field-effect transistors.

[Communication]
Masahiko Saito, Itaru Osaka, Yosuke Suda, Hiroyuki Yoshida, Kazuo Takimiya
Adv. Mater., May 23, 2016, DOI: 10.1002/adma.201601373. Read article

Dual Effect of ITO-Interlayer on Inverted Top-Illuminated Polymer Solar Cells: Wetting of Polyelectrolyte and Tuning of Cavity

Dual Effect of ITO‐Interlayer on Inverted Top‐Illuminated Polymer Solar Cells: Wetting of Polyelectrolyte and Tuning of Cavity

Flexible inverted top-illuminated polymer solar cells (IT-PSCs) are fabricated on metallic substrate by designing a microcavity structure. The ITO layer allows the wetting of cathode interlayer of polyelectrolyte on Ag reflector. The spectral tuning of absorption spectrum is simultaneously demonstrated by employing the ITO interlayer. The optimized IT-PSCs shows high-efficiency, excellent mechanical flexibility, and air-stability.

[Full Paper]
Wan Jae Dong, Jae Yong Park, Juyoung Ham, Gwan Ho Jung, Illhwan Lee, Jong-Lam Lee
Adv. Funct. Mater., May 23, 2016, DOI: 10.1002/adfm.201601764. Read article

Graphdiyne: An Efficient Hole Transporter for Stable High-Performance Colloidal Quantum Dot Solar Cells

Graphdiyne: An Efficient Hole Transporter for Stable High‐Performance Colloidal Quantum Dot Solar Cells

The novel large π-conjugated carbon hole transporting material, graphdiyne (GD) is used as anode buffer layer in PbS CQD solar cells. GD increases carrier lifetime and reduces carrier recombination inside the PbS CQD solar cells. Notably, a high power conversion efficiency of 10.64% is achieved, and the device also shows high long-term stability in ambient air.

[Full Paper]
Zhiwen Jin, Mingjian Yuan, Hui Li, Hui Yang, Qing Zhou, Huibiao Liu, Xinzheng Lan, Mengxia Liu, Jizheng Wang, Edward H. Sargent, Yuliang Li
Adv. Funct. Mater., May 23, 2016, DOI: 10.1002/adfm.201601570. Read article

Stable Organic–Inorganic Perovskite Solar Cells without Hole-Conductor Layer Achieved via Cell Structure Design and Contact Engineering

Stable Organic–Inorganic Perovskite Solar Cells without Hole‐Conductor Layer Achieved via Cell Structure Design and Contact Engineering

To mitigate the instability of perovskite solar cells via device structure design and contact engineering, a hole-conductor layer-free structure of device and a unique bi-layer hybrid carbon back contact are adopted. The cells not only achieve an enhanced efficiency of 13.6% from the initial 11.3% after 100 °C treatment, but also exhibit excellent moist and thermal stability.

[Full Paper]
Zhenhua Yu, Bolei Chen, Pei Liu, Changlei Wang, Chenhao Bu, Nian Cheng, Sihang Bai, Yanfa Yan, Xingzhong Zhao
Adv. Funct. Mater., May 20, 2016, DOI: 10.1002/adfm.201504564. 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

High Efficiency Pb–In Binary Metal Perovskite Solar Cells

High Efficiency Pb–In Binary Metal Perovskite Solar Cells

Mixed Pb–In perovskite solar cells are fabricated by using lead(II) chloride and indium(III) chloride with methylammonium iodide. A maximum power conversion efficiency as high as 17.55% is achieved owing to the high quality of perovskites with multiple ordered crystal orientations.

[Communication]
Zhao-Kui Wang, Meng Li, Ying-Guo Yang, Yun Hu, Heng Ma, Xing-Yu Gao, Liang-Sheng Liao
Adv. Mater., May 17, 2016, DOI: 10.1002/adma.201600626. Read article

Intrinsic Charge Transport across Phase Transitions in Hybrid Organo-Inorganic Perovskites

Intrinsic Charge Transport across Phase Transitions in Hybrid Organo‐Inorganic Perovskites

Hall effect measurements in CH3NH3PbBr3 single crystals reveal that the charge carrier mobility follows an inverse-temperature power law dependence, μTγ, with the power exponent γ = 1.4 ± 0.1 in the cubic phase, indicating an acoustic phonon dominated carrier scattering, and γ = 0.5 ± 0.1 in the tetragonal phase, suggesting another dominant mechanism, such as a piezoelectric or space-charge scattering.

[Communication]
Hee Taek Yi, Xiaoxi Wu, Xiaoyang Zhu, Vitaly Podzorov
Adv. Mater., May 17, 2016, DOI: 10.1002/adma.201600011. 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

A Three-Step Method for the Deposition of Large Cuboids of Organic–Inorganic Perovskite and Application in Solar Cells

A Three‐Step Method for the Deposition of Large Cuboids of Organic–Inorganic Perovskite and Application in Solar Cells

Slowly does it! A new three-step method includes PbI2 deposition, followed by dipping into a solution of C4H9NH3I (BAI), to form (BA)2PbI4 perovskite. In the final step, the poorly thermodynamically stable (BA)2PbI4 perovskite converts into the more stable CH3NH3PbI3 phase through dipping into a solution of CH3NH3I (MAI; see figure). The product CH3NH3PbI3 perovskite films show highly crystalline structure with overlayers composed of large cuboids.

[Article]
Saeed Shahbazi, Mahdi Malekshahi Byranvand, Fariba Tajabadi, Shahrara Afshar, Nima Taghavinia
ChemPhysChem, May 11, 2016, DOI: 10.1002/cphc.201600229. 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

Metal-Free Sensitizers for Dye-Sensitized Solar Cells

Metal‐Free Sensitizers for Dye‐Sensitized Solar Cells

Sensitive architecture: This review focuses on work on metal-free sensitizers for dye-sensitized solar cells (DSSCs). Sensitizers based on D−A′−π−A (D is a donor, A is an acceptor, A′ is an electron-deficient entity) architecture exhibit better light harvesting than D−π−A-type sensitizers. The introduction of an additional acceptor group has several advantages and leads to excellent cell performance. Novel high-performance aqueous-based DSSCs were developed with a dual redox couple comprised of imidazolium iodide and 2,2,6,6-tetramethylpiperidin-N-oxyl.

[Personal Account]
Sumit Chaurasia, Jiann T. Lin
The Chemical Record, April 26, 2016, DOI: 10.1002/tcr.201500288. Read article

Metal-Free Indeno[2,1-b]thiophene-Based Sensitizers for Dye-Sensitized Solar Cells

Metal‐Free Indeno[2,1‐b]thiophene‐Based Sensitizers for Dye‐Sensitized Solar Cells

Anchoring thiophenes: A series of indeno[2,1-b]thiophene-containing organic dyes (IDT1IDT5) has been employed as sensitizers for dye-sensitized solar cells, and the UV/Vis spectra are measured beyond 700 nm. Among them, dyes IDT3IDT5 with the thiophene unit conjugated with an anchor have better light harvesting and higher JSC values. Furthermore, IDT5 with chenodeoxycholic acid (CDCA) as the co-adsorbent has the highest power conversion efficiency (5.06 %), which is 68 % of the standard device based on N719 dye.

[Full Paper]
Chia-Jung Liang, Yu-Ju Lin, Yung-Sheng Yen, Jiann T. Lin, Ming-Chang P. Yeh
Asian J. Org. Chem., April 26, 2016, DOI: 10.1002/ajoc.201600100. Read article

Our Expedition in Linear Neutral Platinum-Acetylide Complexes: The Preparation of Micro/nanostructure Materials, Complicated Topologies, and Dye-Sensitized Solar Cells

Our Expedition in Linear Neutral Platinum‐Acetylide Complexes: The Preparation of Micro/nanostructure Materials, Complicated Topologies, and Dye‐Sensitized Solar Cells

The construction of linear neutral platinum-acetylide complexes has attracted considerable attention because of their attractive properties such as well-defined linear geometry, synthetic accessibility, and intriguing photoproperties. This personal account reviews the recent progress of our group on construction of new linear neutral platinum-acetylide complexes and their applications in the areas of micro/nanostructure materials, complicated topologies, and dye-sensitized solar cells.

[Personal Account]
Lin Xu, Hai-Bo Yang
The Chemical Record, April 21, 2016, DOI: 10.1002/tcr.201500271. Read article

Opposite Anisotropy Effects of Singlet and Triplet Exciton Diffusion in Tetracene Crystal

Opposite Anisotropy Effects of Singlet and Triplet Exciton Diffusion in Tetracene Crystal

Some exciton news! Anisotropy difference for singlet and triplet excitons is shown to occur in organic crystals, ascribed to their distinct excitonic coupling mechanisms (Coulomb Förster vs. exchange Dexter). Such a finding provides a new framework to understand a vast range of photophysical problems and optimize the energy transfer efficiency of organic optoelectronic materials.

[Communication]
Xiaoyu Xie, Haibo Ma
ChemistryOpen, February 18, 2016, DOI: 10.1002/open.201500214. 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

Thumbnail image of graphical abstract

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

Thumbnail image of graphical abstract

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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