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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Despite its large ionic radius, ethylammonium can partially replace methylammonium in the widely studied 3D hybrid perovskites CH3NH3PbI3. This partial replacement results in higher crystal symmetry, improved material stability, and markedly enhanced photocarrier lifetime of the alloy perovskites.
Wei Peng, Xiaohe Miao, Valerio Adinolfi, Erkki Alarousu, Omar El Tall, Abdul-Hamid Emwas, Chao Zhao, Grant Walters, Jiakai Liu, Olivier Ouellette, Jun Pan, Banavoth Murali, Edward H. Sargent, Omar F. Mohammed, Osman M. Bakr
Angew. Chem. Int. Ed., July 28, 2016, DOI: 10.1002/anie.201604880. Read article
A novel wide-bandgap conjugated polymer PBTA-FPh based on benzodithiophene-alt-benzo[1,2,3]triazole as the main chain and a polar pentafluorothiophenyl (FPh) group in a side chain has been designed and synthesized as a polymeric additive. The incorporation of PBTA-FPh can lead to improved miscibility and morphology of PBTA-BO:PC71BM blend films, resulting in obviously improved power conversion efficiency of polymer solar cells from 6.46% to 7.91%.
Baobing Fan, Chen Sun, Xiao-Fang Jiang, Guichuan Zhang, Zhiming Chen, Lei Ying, Fei Huang, Yong Cao
Adv. Funct. Mater., July 28, 2016, DOI: 10.1002/adfm.201601625. Read article
New indoline derivatives characterized by good planarity and high molar absorptivity are successfully applied to dye-sensitized solar cells (DSCs). By controlling the hydrocarbon chain length, noticeable photocurrent density is achieved at a very thin TiO2 film, which is traced elementally, guiding the research of organic dyes for thin film-based DSCs.
Ming Yu Jin, Byung-Man Kim, Hyun Sil Jung, Jun-Hyeok Park, Deok-Ho Roh, Dong Guk Nam, Tae-Hyuk Kwon, Do Hyun Ryu
Adv. Funct. Mater., July 28, 2016, DOI: 10.1002/adfm.201600951. Read article
Donor–acceptor–acceptor′ small-molecule donors are synthesized to investigate regioisomeric effects on organic photovoltaic device performance. Cross-conjugation in 2-((7-(N-(2-ethylhexyl)-benzothieno[3,2-b]thieno[3,2-d]pyrrol-2-yl)benzo[c][1,2,5]thiadiazol-4-yl)methylene)malononitrile leads to an increased open circuit voltage compared with its isomer 2-((7-(N-(2-ethylhexyl)-benzothieno[3,2-b]thieno[2,3-d]pyrrol-2-yl)benzo[c][1,2,5]thiadiazol-4-yl)methylene)malononitrile. A correlation is then established between molecular conjugation length and orbital energies, and hence open circuit voltage.
Xiaozhou Che, Chin-Lung Chung, Xiao Liu, Shu-Hua Chou, Yi-Hung Liu, Ken-Tsung Wong, Stephen R. Forrest
Adv. Mater., July 25, 2016, DOI: 10.1002/adma.201601957. Read article
Two novel small molecular materials are explored as the hole-transporting layer in p-i-n perovskite solar cells (PSCs), yielding high efficiencies of 17.4% and 17.6%, respectively, which are ≈40% higher than the standard PSCs.
Yang Li, Zheng Xu, Suling Zhao, Bo Qiao, Di Huang, Ling Zhao, Jiao Zhao, Peng Wang, Youqin Zhu, Xianggao Li, Xicheng Liu, Xurong Xu
Small, July 22, 2016, DOI: 10.1002/smll.201601603. Read article
We study the effect of carboxylate and diethylphosphonate anchoring groups, on the optical properties of cyclometalated iridium(III) complexes and further applied these complexes in Dye-Sensitized Solar Cells. Although the phosphonate-appended iridium complexes present stronger bonding to the TiO2 surface in aqueous solution, the highest power conversion efficiency was obtained from the carboxylate-appended complexes.
Ainara Telleria, B. S. Emerson C. Kohlrausch, Rodrigo da C. Duarte , Fabiano S. Rodembusch, Jairton Dupont, Zoraida Freixa , Marcos J. L. Santos
ChemistrySelect, July 22, 2016, DOI: 10.1002/slct.201600700. Read article
The application of cobalt sulfide as counter electrodes in a p-type dye sensitized solar cell, using I-/I3- as redox electrolyte and erythrosine B as photosensitizer anchored to p-type nickel oxide. The charge separation happens at the interface erythrosine//electrolyte after the absorption of a photon. In our configuration, the reduced redox mediator (I-) have been regenerated at the anode: a conducting transparent oxide (TCO) covered with a thin layer of CoS.
Mirko Congiu, Matteo Bonomo, Maria Letizia De Marco, Denis P. Dowling, Aldo Di Carlo, Danilo Dini, Carlos F. O. Graeff
ChemistrySelect, July 22, 2016, DOI: 10.1002/slct.201600297. Read article
Thermoelectric NaCo2O4/TiO2 coaxial nanofibers are prepared and distributed in the perovskite solar cells. Under illumination, p-type NaCo2O4 can convert unwanted heat to thermal voltage, and thus promote the electron extraction and transport with the action of electrostatic force. These advantages collectively contribute to an overall power conversion efficiency improvement of ≈20% (15.14% vs 12.65%).
Tao Liu, Cheng Wang, Juan Hou, Chuanbo Zhang, Haijun Chen, Hongcai He, Ning Wang, Hui Wu, Guozhong Cao
Small, July 21, 2016, DOI: 10.1002/smll.201601616. Read article
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.
Lara Tejerina, M. Victoria Martínez-Díaz, Mohammad K. Nazeeruddin, Michael Grätzel, Tomas Torres
ChemPlusChem, July 20, 2016, DOI: 10.1002/cplu.201600325. Read article
2D phosphorene, a phosphorus analog of graphene, has drawn significant attention for a wide range of applications due to its outstanding properties. The development of phosphorene and phosphorene-based materials is comprehensively reviewed.
Munkhbayar Batmunkh, Munkhjargal Bat-Erdene, Joseph G. Shapter
Adv. Mater., July 20, 2016, DOI: 10.1002/adma.201602254. Read article
Benzimidazole-branched di-anchoring organic dyes containing triphenylamine or phenothiazine donor, 2-cyanoacrylic acid acceptor and various π-linkers have been synthesized and examined as sensitizers for dye sensitized solar cells. The structure-property relationship in these dyes is systematically investigated by absorption spectral, cyclic voltammetric and DFT studies. The absorption peak is dramatically affected by the nature of the π-linker rather than the donor strength. For a donor, the absorption maximum (λmax) is red-shifted on changing the π-linker from phenyl to 2,2'-bithiophene. However, the dyes bearing triphenylamine unit displayed high molar extinction coefficients (ε) than their analogues phenothiazine-based dyes hence high light-harvesting propensity for the former dyes. Electrochemical data for the dyes indicate that the triphenylamine-based dyes possess relatively low-lying HOMO values which can be beneficial to suppress the back electron transfer from conduction band of TiO2¬ to oxidized dyes due to facile regeneration of oxidized dye by electrolyte. Best performance in DSSC was observed for a dye possessing triphenylamine and 2,2'-bithiophene as a π-linker. Electron impedance spectroscopy (EIS) studies revealed that use of triphenylamine donor and phenyl or 2,2'-bithiophene as a π-linkers is beneficial to jeopardize the dark current and charge recombination kinetics, whichled to high electron life time of injected electrons in the CB of TiO2.
K R Justin Thomas, Govardhana Babu Bodedla, Miao-Syuan Fan, Kuo-Chuan Ho
Chem. Asian J., July 19, 2016, DOI: 10.1002/asia.201600766. Read article
For the PTB7-Th:PC71BM blend system, the binary solvent additives of 1,8-diiodooctane and N-methyl pyrrolidone are used to enhance the domain purity, so that a power conversion efficiency of 10.8% is achieved with the conventional device structure, which is much higher than that of the devices without or with single solvent additive treatment.
Qun Wan, Xia Guo, Zaiyu Wang, Wanbin Li, Bing Guo, Wei Ma, Maojie Zhang, Yongfang Li
Adv. Funct. Mater., July 19, 2016, DOI: 10.1002/adfm.201602181. Read article
Uniform perovskite films are achieved by HCl-assisted one-step spin-coating at room temperature. By this method, a highest power conversion efficiency of 17.9% is obtained for perovskite solar cells. The devices retain ≈95% of their original efficiency after storage in air for two months. The highest efficiency obtained of large area PSCs (0.86 cm2) is 15.7%.
Jinlong Pan, Cheng Mu, Qi Li, Weizhen Li, Ding Ma, Dongsheng Xu
Adv. Mater., July 15, 2016, DOI: 10.1002/adma.201601881. Read article
Highly efficient electron extraction is achieved by using photoconductive cathode interlayer in inverted ternary organic solar cells (OSCs) where a near-IR absorbing porphyrin molecule is used as the sensitizer. The OSCs show improved device performance when the ratio of the two donors varies in a large region and the maximum power conversion efficiency up to 11.03% is demonstrated.
Li Nian, Ke Gao, Feng Liu, Yuanyuan Kan, Xiaofang Jiang, Linlin Liu, Zengqi Xie, Xiaobin Peng, Thomas P. Russell, Yuguang Ma
Adv. Mater., July 14, 2016, DOI: 10.1002/adma.201602834. Read article
Nanostructured silicon used in flexible photovoltaics, thermoelectric generators and piezoelectric devices for electricity generation is reviewed with regard to the unique optical and electrical properties of nanostructured silicon. Organic–silicon heterojunction photovoltaic devices, silicon-nanowire thermoelectric generators, and core/shell silicon/silicon oxide nanowire piezoelectric devices for electricity generation are discussed considering their potential applications in flexible, light-weight, and portable devices.
Baoquan Sun, Mingwang Shao, Shuitong Lee
Adv. Mater., July 14, 2016, DOI: 10.1002/adma.201601012. Read article
LEGO-like multilevel multiscale patterns prepared by multiplex lithography are imprinted on the photoelectrode of mesoscopic solar cells. Enhanced light harvesting by superposition of diffraction grating and scattering are achieved by z-axis integration of nano- and micropatterns, respectively, and this leads to significant increase in energy conversion efficiency.
Segeun Jang, Jin Soo Kang, Jong-Kwon Lee, Sang Moon Kim, Yoon Jun Son, Ahyoun Lim, Hyesung Cho, Jin Kim, Juwon Jeong, Gunhee Lee, Yung-Eun Sung, Mansoo Choi
Adv. Funct. Mater., July 14, 2016, DOI: 10.1002/adfm.201601586. Read article
A new world record efficiency for thin film solar cells of 22.6% has been achieved with a rubidium fluoride post-deposition treatment. The authors compare treatments using lighter and heavier alkali elements as applied to the Cu(In,Ga)Se2 absorber. An interesting competitive behaviour of the various alkali elements in this functional layer of the solar cell is described.
Philip Jackson, Roland Wuerz, Dimitrios Hariskos, Erwin Lotter, Wolfram Witte, Michael Powalla
Phys. Status Solidi RRL, July 12, 2016, DOI: 10.1002/pssr.201600199. Read article
Coordination needed: Structural defects are created during crystallization of perovskite materials depending on coordination ability of the solvents.
Sara Rahimnejad, Alexander Kovalenko, Sergio Martí Forés, Clara Aranda, Antonio Guerrero
ChemPhysChem, July 12, 2016, DOI: 10.1002/cphc.201600575. Read article
Adding a whole new layer: Inverted perovskite solar cells (PSCs) based on dopant-free QCAPZ as an electron-transport layer (ETL) material display a power conversion efficiency up to 10.26 %.
Pei-Yang Gu, Ning Wang, Anyang Wu, Zilong Wang, Miaomiao Tian, Zhisheng Fu, Xiao Wei Sun, Qichun Zhang
Chem. Asian J., July 12, 2016, DOI: 10.1002/asia.201600856. Read article
A lattice-matched and current-matched three-terminal GaAsP/SiGe tandem solar cell on Si substrate has been further fabricated using light trapping techniques. The Jsc of the bottom cell has been increased by relative 7.4%. This current improvement leads to a predicted efficiency of near 21% for this tandem device.
Li Wang, Dun Li, Xin Zhao, Brianna Conrad, Martin Diaz, Anastasia Soeriyadi, Anthony Lochtefeld, Andrew Gerger, Ivan Perez-Wurfl, Allen Barnett
Phys. Status Solidi RRL, July 11, 2016, DOI: 10.1002/pssr.201600157. Read article
The modulation of optical absorption by using an optical spacer layer is a unique method to enhance the efficiency of perovskite solar cells. The authors demonstrate the application of a thin ZnO layer that acts as an optical spacer enhancing the power conversion efficiency of perovskite devices from 8.92% to 10.7%, which is mainly due to the increment in short-circuit current density by 16% compared to the reference solar cell.
Kangmin Kim, Buyoung Jung, Neetesh Kumar, Yoomin Eom, Woochul Kim
Phys. Status Solidi RRL, July 08, 2016, DOI: 10.1002/pssr.201600037. Read article
The material composition in a bulk heterojunction (BHJ) of an all-polymer solar cell is analyzed down to the bottom surface by Kelvin probe force microscopy. The phase separation of the composites both on the top and at the bottom of a BHJ can be measured and reconstructed with this easy-to-use approach in a nondestructive way.
Zequn Cui, Jianxia Sun, Dominik Landerer, Christian Sprau, Richard Thelen, Alexander Colsmann, Hendrik Hölscher, Wanli Ma, Lifeng Chi
Adv. Mater. Interfaces, July 08, 2016, DOI: 10.1002/admi.201600446. Read article
A nonfullerene polymer solar cell with a high efficiency of 9.26% is realized by using benzodithiophene–alt–fluorobenzotriazole copolymer J51 as a medium bandgap polymer donor and the low bandgap organic semiconductor ITIC with high extinction coefficients as acceptor.
Liang Gao, Zhi-Guo Zhang, Haijun Bin, Lingwei Xue, Yankang Yang, Cheng Wang, Feng Liu, Thomas P. Russell, Yongfang Li
Adv. Mater., July 07, 2016, DOI: 10.1002/adma.201601595. Read article
From both sides: Poly(3,4-ethylene- dioxythiophene) (PEDOT)/polypyrrole films with hollow micro-/nanohorn arrays are fabricated by using electrochemical methods. Electrolytes can access both the ouside and inside surfaces of the horns (see figure), and the composite film shows comparable catalytic activity to platinum as a counter electrode for dye-sensitized solar cells.
Yang Bai, Youlong Xu, Jie Wang, Mingqi Gao, Jianbo Zhu, Wasif ur Rehman
ChemElectroChem, July 06, 2016, DOI: 10.1002/celc.201600191. Read article
In the formamidinium (FA) lead iodide/titania heterostructure the organic layer-mediated interface, i.e., FAI/titania interface, can induce photovoltaic diode effect via positive bias poling due to combined effects of ion diffusion, rotation of organic moieties, and ferroelectric redistribution.
Hong-Jian Feng, Jinsong Huang, Xiao Cheng Zeng
Adv. Mater. Interfaces, July 06, 2016, DOI: 10.1002/admi.201600267. Read article
To extend the understanding of alkaline treatments, we have shown these treatments are responsible for differences in surface chemistry, a feature of Cu(In1–xGax)Se2 (CIGS). It is observed that the CIGS/CdS heterojunction is affected by the treatment and the differences in copper enrichment are pronounced. This finding demonstrates how leading alkali chemical treatments can have dramatic effects on CIGS.
Jeffery A. Aguiar, Adam Stokes, Chun-Sheng Jiang, Toshihiro Aoki, Paul G. Kotula, Maulik K. Patel, Brian Gorman, Mowafak Al-Jassim
Adv. Mater. Interfaces, July 06, 2016, DOI: 10.1002/admi.201600013. Read article
Donor selection: Three n-type alternating donor–acceptor type naphthalenediimide (NDI)–arylene copolymers, constructed from donor units with varied electron-donating strength were synthesized for the application as acceptor materials in all-polymer solar cells (all-PSCs). The results indicate that a larger conjugated fused molecular plane with more thiophene rings as donor units is beneficial to reduce the band gap, broaden the absorption, and enhance the photovoltaic performance of the copolymer acceptors.
Lingwei Xue, Yankang Yang, Zhi-Guo Zhang, Jing Zhang, Liang Gao, Haijun Bin, YunXu Yang, Yongfang Li
Chem. Asian J., July 05, 2016, DOI: 10.1002/asia.201600450. Read article
The photovoltaic efficiency in perovskite films with various thicknesses has been investigated. It is shown that the photovoltaic efficiency of perovskite films can be significantly changed by the absorber layer thickness. By the analysis of the electron transfer mechanisms, a strong correlation between the internal structure factors of the perovskite layer and the photoelectric performance is revealed.
Bo Zhang, Ming-Jia Zhang, Shu-Ping Pang, Chang-Shui Huang, Zhong-Min Zhou, Dong Wang, Ning Wang, Guang-Lei Cui
Adv. Mater. Interfaces, July 04, 2016, DOI: 10.1002/admi.201600327. Read article
The interfacial charge transfer state energy of a crystalline rubrene/C60 solar cell is over 300 meV lower than that of an amorphous rubrene/C60 device. Despite that both amorphous and crystalline rubrene undergo singlet fission, this shift means that only the crystalline device can dissociate the low energy triplets generated by singlet fission and operate as a singlet fission solar cell.
YunHui L. Lin, Michael A. Fusella, Oleg V. Kozlov, Xin Lin, Antoine Kahn, Maxim S. Pshenichnikov, Barry P. Rand
Adv. Funct. Mater., July 04, 2016, DOI: 10.1002/adfm.201601125. Read article
Three n-type conjugated polymers are synthesized to achieve the most efficient acceptor–acceptor type polymer-based all-polymer photovoltaic cells with an efficiency of 2.68% and the first all-polymer photodetectors with high responsivity (0.12 A W−1) and detectivity (1.2 × 1012 Jones). This contribution provides a strategy of tuning the polymeric structures to achieve high performance all-polymer photoresponse devices.
Xiaofen Wang, Lei Lv, Lingliang Li, Yusheng Chen, Kai Zhang, Haoran Chen, Huanli Dong, Jinsong Huang, Guozhen Shen, Zhou Yang, Hui Huang
Adv. Funct. Mater., July 01, 2016, DOI: 10.1002/adfm.201601745. Read article
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%.
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
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.
Sheng Zhang, Zijian Zhang, Jun Liu, Lixiang Wang
Adv. Funct. Mater., June 29, 2016, DOI: 10.1002/adfm.201600350. Read article
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.
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
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.
Xinliang Zhang, Jiannian Yao, Chuanlang Zhan
Adv. Mater. Interfaces, June 28, 2016, DOI: 10.1002/admi.201600323. Read article
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.
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
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.
Yuxia Chen, Chuanlang Zhan, Jiannian Yao
Chem. Asian J., June 02, 2016, DOI: 10.1002/asia.201600374. Read article
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.
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
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.
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
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.
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.
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.
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.
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.
Georgios Rotas, Nikos Tagmatarchis
Chem. Eur. J., November 26, 2015, DOI: 10.1002/chem.201502190. Read article.
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.
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
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.
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
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.
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
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.
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
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.
Yehao Deng, Zhengguo Xiao, Jinsong Huang
Adv. Energy Mater., August 07, 2015, DOI: 10.1002/aenm.201500721. Read article
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.
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
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.
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
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.
Christian J. Mueller, Michael Brendel, Pia Ruckdeschel, Jens Pflaum, Mukundan Thelakkat
Adv. Energy Mater., July 27, 2015, DOI: 10.1002/aenm.201500914. Read article
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.
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
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.
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
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.
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
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.
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
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.
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
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.
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
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.
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
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.
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
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.
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 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.
Jae Woong Jung, Chu-Chen Chueh, Alex K.-Y. Jen
Adv. Energy Mater., July 06, 2015, DOI: 10.1002/aenm.201500486. Read article
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.
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
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.
Dewei Zhao, Cheng Zhang, Hyunsoo Kim, L. Jay Guo
Adv. Energy Mater., June 25, 2015, DOI: 10.1002/aenm.201500768. Read article