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organic solar cell

Riccardo Volpi, Mathieu Linares
Charge transfer (CT) state separation is one of the most critical processes in the functioning of an organic solar cell. In this article, we study a bilayer of TQ1 and PC71 BM molecules presenting disorder at the interface, obtained by means of Molecular Dynamics. The study of the CT state splitting can be first analyzed through the CT state splitting diagram, introduced in a previous work. Through this analysis, we identify the possibility of CT state splitting within Marcus Theory in function of the electric field...
March 20, 2017: Journal of Computational Chemistry
Raquel Rondão, Ana Frias, Sandra Correia, Lianshe Fu, Verónica de Zea Bermudez, Paulo André, Rute A S Ferreira, Luis D Carlos
Luminescent solar concentrators (LSCs) appear as candidates to enhance the performance of photovoltaic (PV) cells and contribute to reduce the size of PV systems, decreasing, therefore, the amount of material needed, and thus the cost associated with energy conversion. One way to maximize the devices performance is to explore near infrared (NIR)-emitting centers, resonant with the maximum optical response of the most common Si-based PV cells. Nevertheless, very few examples in the literature demonstrate the feasibility of fabricating LSCs emitting in the NIR region...
March 20, 2017: ACS Applied Materials & Interfaces
Yongguang Tu, Jihuai Wu, Zhang Lan, Xin He, Jia Dong, Jinbiao Jia, Panfeng Guo, Jianming Lin, Miaoliang Huang, Yunfang Huang
The organic-inorganic lead halide perovskite layer is a crucial factor for the high performance perovskite solar cell (PSC). We introduce CH3NH3Br in the precursor solution to prepare CH3NH3PbI3-xBrx hybrid perovskite, and an uniform perovskite layer with improved crystallinity and apparent grain contour is obtained, resulting in the significant improvement of photovoltaic performance of PSCs. The effects of CH3NH3Br on the perovskite morphology, crystallinity, absorption property, charge carrier dynamics and device characteristics are discussed, and the improvement of open circuit voltage of the device depended on Br doping is confirmed...
March 17, 2017: Scientific Reports
Yoon-Ho Nam, Jae-Won Song, Min-Joon Park, Abdul Sami, Jung-Ho Lee
Hybrid organic-inorganic photovoltaic devices consisting of poly(3,4-etyhlenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and n-type silicon have recently been investigated for their cost-efficiency and ease of fabrication. We demonstrate that the insertion of an ultrathin Al2O3 layer between n-Si and PEDOT:PSS significantly improves photovoltaic performance in comparison to the conventional interfacial oxide employing SiO2. A power-conversion efficiency of 11.46% was recorded at the optimal Al2O3 thickness of 2...
April 18, 2017: Nanotechnology
Sumit Chaurasia, Chun Ting Li, Mulu Berhe Desta, Jen Shyang Ni, Jiann T Lin
A new series of benzimidazole (BIm) based dyes (SC32 and SC33) and pyridoimidazole (PIm) based dyes (SC35 and SC36) were synthesized as the sensitizers for dye-sensitized solar cells. The N-substituent and C-substituent at the BIm and PIm cores was found to be the dominating factor in deciding the electronic properties of the dyes and their DSSCs performance. The efficiency of BIm-based dyes (SC35 and SC36) was found higher than the BIm-based dyes (SC32 and SC33) due to better light harvesting. The C-substituent in SC36, 4-hexylloxybenzene, is beneficial to dark current suppression, and hence SC36 achieves the best efficiency of 7...
March 16, 2017: Chemistry, An Asian Journal
Bin Kan, Huanran Feng, Xiangjian Wan, Feng Liu, Xin Ke, Yanbo Wang, Yunchuang Wang, Hongtao Zhang, Chenxi Li, Jianhui Hou, Yongsheng Chen
A new acceptor-donor-acceptor (A-D-A) type small molecule, namely NFBDT, with a heptacyclic benzodi(cyclopentadithiophene) (FBDT) unit based on BDT as the central building block, was designed and synthesized. Its optical, electrical, thermal properties and photovoltaic performances were systematically investigated. NFBDT exhibits a low optical bandgap of 1.56 eV resulting in wide and efficient absorption in the range from 600 to 800 nm, and suitable energy levels as an electron acceptor. With the widely used and successful wide bandgap polymer PBDB-T selected as the donor material, an optimized PCE of 10...
March 16, 2017: Journal of the American Chemical Society
Fuwen Zhao, Shuixing Dai, Yang Wu, Qianqian Zhang, Jiayu Wang, Li Jiang, Qidan Ling, Zhixiang Wei, Wei Ma, Wei You, Chunru Wang, Xiaowei Zhan
A new fluorinated nonfullerene acceptor, ITIC-Th1, has been designed and synthesized by introducing fluorine (F) atoms onto the end-capping group 1,1-dicyanomethylene-3-indanone (IC). On the one hand, incorporation of F would improve intramolecular interaction, enhance the push-pull effect between the donor unit indacenodithieno[3,2-b]thiophene and the acceptor unit IC due to electron-withdrawing effect of F, and finally adjust energy levels and reduce bandgap, which is beneficial to light harvesting and enhancing short-circuit current density (JSC )...
March 10, 2017: Advanced Materials
Jiang Huang, Hanyu Wang, Kangrong Yan, Xiaohua Zhang, Hongzheng Chen, Chang-Zhi Li, Junsheng Yu
An organic solar cell (OSCs) containing double bulk heterojunction (BHJ) layers, namely, double-BHJ OSCs is constructed via stamp transferring of low bandgap BHJ atop of mediate bandgap active layers. Such devices allow a large gain in photocurrent to be obtained due to enhanced photoharvest, without suffering much from the fill factor drop usually seen in thick-layer-based devices. Overall, double-BHJ OSC with optimal ≈50 nm near-infrared PDPP3T:PC71 BM layer atop of ≈200 nm PTB7-Th:PC71 BM BHJ results in high power conversion efficiencies over 12%...
March 15, 2017: Advanced Materials
Deying Luo, Lichen Zhao, Jiang Wu, Qin Hu, Yifei Zhang, Zhaojian Xu, Yi Liu, Tanghao Liu, Ke Chen, Wenqiang Yang, Wei Zhang, Rui Zhu, Qihuang Gong
The highest efficiencies reported for perovskite solar cells so far have been obtained mainly with methylammonium and formamidinium mixed cations. Currently, high-quality mixed-cation perovskite thin films are normally made by use of antisolvent protocols. However, the widely used "antisolvent"-assisted fabrication route suffers from challenges such as poor device reproducibility, toxic and hazardous organic solvent, and incompatibility with scalable fabrication process. Here, a simple dual-source precursor approach is developed to fabricate high-quality and mirror-like mixed-cation perovskite thin films without involving additional antisolvent process...
March 15, 2017: Advanced Materials
Tobias Schnier, Jennifer Emara, Selina Olthof, Klaus Meerholz
Hybrid organic/inorganic halide perovskites have lately been a topic of great interest in the field of solar cell applications, with the potential to achieve device efficiencies exceeding other thin film device technologies. Yet, large variations in device efficiency and basic physical properties are reported. This is due to unintentional variations during film processing, which have not been sufficiently investigated so far. We therefore conducted an extensive study of the morphology and electronic structure of a large number of CH3NH3PbI3 perovskite where we show how the preparation method as well as the mixing ratio of educts methylammonium iodide and lead(II) iodide impact properties like film formation, crystal structure, density of states, energy levels, and ultimately the solar cell performance...
February 27, 2017: Journal of Visualized Experiments: JoVE
Victor A Brotsman, Vitaliy A Ioutsi, Alexey V Rybalchenko, Vitaliy Yu Markov, Nikita M Belov, Natalia S Lukonina, Sergey I Troyanov, Ilya N Ioffe, Vasiliy A Trukhanov, Galina K Galimova, Artur A Mannanov, Dmitry N Zubov, Erhard Kemnitz, Lev N Sidorov, Tatiana V Magdesieva, Dmitry Yu Paraschuk, Alexey A Goryunkov
A series of novel highly soluble double-caged [60]fullerene derivatives were prepared by means of lithium salt-assisted [2+3]-cycloaddition. The bispheric molecules feature rigid linking of the fullerene spheres via a four-membered cycle and a pyrrolizidine bridge with an ester function CO2R (R=n-decyl, n-octadecyl, benzyl, and n-butyl: compounds 1a-d, respectively), as demonstrated by NMR spectroscopy and X-ray diffraction. Cyclic voltammetry studies revealed three closely overlapping pairs of reversible peaks due to consecutive one-electron reductions of fullerene cages, as well as an irreversible oxidation peak attributed to abstraction of an electron from the nitrogen lone electron pair...
March 9, 2017: Chemistry, An Asian Journal
Qiang Guo, Yingxue Xu, Bo Xiao, Bing Zhang, Erjun Zhou, Fuzhi Wang, Yiming Bai, Tasawar Hayat, Ahmed Alsaedi, Zhan'ao Tan
For organic-inorganic perovskite solar cells (PerSCs), the electron transport layer (ETL) plays a crucial role in efficient electron extraction and transport for high performance PerSCs. Fullerene and its derivatives are commonly used as ETL for p-i-n structured PerSCs. However, these spherical small molecules are easy to aggregate with high annealing temperature and thus induce morphology stability problems. N-type conjugated polymers are promising candidates to overcome these problems due to the tunable energy levels, controllable aggregation behaviors, and good film formation abilities...
March 15, 2017: ACS Applied Materials & Interfaces
Tohru Setoyama, Takahiko Takewaki, Kazunari Domen, Takashi Tatsumi
Curbing anthropogenic CO2 emissions is one of the most important issues in the 21st century in order to mitigate climate change. Although the installation of solar cells for energy supply is in progress and these are becoming popular as an efficient use of sunlight, they are mostly used by energy-related industrial sectors. In the common chemical industry, various fossil resources are used to emit a huge amount of CO2. We believe that the chemical industry can make an effort to curb CO2 emissions by changing its resources to more environmentally benign ones...
March 9, 2017: Faraday Discussions
Robertas Tiazkis, Sanghyun Paek, Maryte Daskeviciene, Tadas Malinauskas, Michael Saliba, Jonas Nekrasovas, Vygintas Jankauskas, Shahzada Ahmad, Vytautas Getautis, Mohammad Khaja Nazeeruddin
The molecular structure of the hole transporting material (HTM) play an important role in hole extraction in a perovskite solar cells. It has a significant influence on the molecular planarity, energy level, and charge transport properties. Understanding the relationship between the chemical structure of the HTM's and perovskite solar cells (PSCs) performance is crucial for the continued development of the efficient organic charge transporting materials. Using molecular engineering approach we have constructed a series of the hole transporting materials with strategically placed aliphatic substituents to investigate the relationship between the chemical structure of the HTMs and the photovoltaic performance...
December 2017: Scientific Reports
Songbo Wang, Xiangwen Zhang, Shuai Li, Yuan Fang, Lun Pan, Ji-Jun Zou
ZnO is an important semiconductor and has been widely used in the field of photocatalysis, solar cell and environmental remediation. Herein, we fabricated C-doped ZnO ball-in-ball hollow microspheres (BHMs) by a facile solvothermal treatment of zinc acetate in ethylene glycol-ethanol mixture. The presence of ethylene glycol (EG) leads to the formation of initial single-layered hollow spheres and then a time-dependent evolution transforms them into uniform BHMs with tunable shell thickness and void space. XPS characterizations reveal that C-dopants are introduced into the lattice of ZnO BHMs, with its concentration increasing with solvothermal time and then becoming saturated in 12h...
February 27, 2017: Journal of Hazardous Materials
Bohee Hwang, Chungwan Gu, Donghwa Lee, Jang-Sik Lee
Mixed halide perovskite materials are actively researched for solar cells with high efficiency. Their hysteresis which originates from the movement of defects make perovskite a candidate for resistive switching memory devices. We demonstrate the resistive switching device based on mixed-halide organic-inorganic hybrid perovskite CH3NH3PbI3-xBrx (x = 0, 1, 2, 3). Solvent engineering is used to deposit the homogeneous CH3NH3PbI3-xBrx layer on the indium-tin oxide-coated glass substrates. The memory device based on CH3NH3PbI3-xBrx exhibits write endurance and long retention, which indicate reproducible and reliable memory properties...
March 8, 2017: Scientific Reports
Yan-Syun Ciou, Po-Han Lin, Wei-Ming Li, Kun-Mu Lee, Ching-Yuan Liu
A variety of push-pull type organic dyes are facilely synthesized through the most atom-economical C-H/C-H dehydrogenative coupling reactions. After comprehensive synthetic optimizations, a broad substrate scope is achieved and functional groups such as ester, ketone, nitrile, nitro, and triazene are well tolerated. The sensitive aldehyde group required for the conversion into anchoring groups for DSSCs applications is also compatible under present oxidant-containing reaction conditions. Based on this optimum C-H/C-H coupling approach, three new organic sensitizers are readily prepared and submitted to solar cell device fabrications, giving the power conversion efficiency (PCE) up to 4...
March 7, 2017: Journal of Organic Chemistry
Xudong Jiang, Yunhua Xu, Xiaohui Wang, Yang Wu, Guitao Feng, Cheng Li, Wei Ma, Weiwei Li
In this work, we provide systematic studies on the non-fullerene solar cells based on diketopyrrolopyrrole (DPP) polymers as electron donors and a well-known electron acceptor ITIC. ITIC has been widely reported in non-fullerene solar cells with high power conversion efficiencies (PCEs) above 10%, when it is combined with a wide band gap conjugated polymer, while its application in small band gap DPP polymers has never been reported. Herein, we select four DPP polymers containing different thienyl linkers, resulting in distinct absorption spectra, energy levels and crystalline properties...
March 7, 2017: Physical Chemistry Chemical Physics: PCCP
Simon A Dowland, Michael Salvador, Jose Dario Perea, Nicola Gasparini, Stefan Langner, Sambatra Rajoelson, Hasina Harimino Ramanitra, Benjamin D Lindner, Andres Osvet, Christoph J Brabec, Roger C Hiorns, Hans-Joachim Egelhaaf
A novel main-chain poly(fullerene) poly{(fullerene)-alt-[2,5-bis(octyloxy)terephthalaldehyde]} (PPC4) is investigated for its hypothesized superior morphological stability as an electron accepting material in organic photovoltaics relative to the widely used fullerene phenyl-C61-butyric acid methyl ester (PCBM). When mixed with poly(3-hexylthiophene-2,5-diyl) (P3HT) PPC4 affords low charge generation yields due to poor intermixing within the blend. The adoption of a multi-acceptor system, by introducing PCBM into the P3HT:poly(fullerene) blend, was found to lead to a threefold enhancement in charge generation, affording power conversion efficiencies very close to the prototypical P3HT:PCBM binary control...
March 6, 2017: ACS Applied Materials & Interfaces
Fiona A Black, Charlotte A Clark, Gareth H Summers, Ian P Clark, Michael Towrie, Thomas Penfold, Michael W George, Elizabeth A Gibson
Understanding what influences the formation and lifetime of charge-separated states is key to developing photoelectrochemical devices. This paper describes the use of time-resolved infrared absorption spectroscopy (TRIR) to determine the structure and lifetime of the intermediates formed on photoexcitation of two organic donor-π-acceptor dyes adsorbed to the surface of NiO. The donor and π-linker of both dyes is triphenylamine and thiophene but the acceptors differ, maleonitrile (1) and bodipy (2). Despite their structural similarities, dye 1 outperforms 2 significantly in devices...
March 6, 2017: Physical Chemistry Chemical Physics: PCCP
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