共查询到20条相似文献，搜索用时 15 毫秒
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Polymer solar cells (PSCs) have attracted great attention in recent years because of their advantages of easy fabrication, low cost, light weight, and potential for flexible devices. However, the power conversion efficiency (PCE) of the PSCs needs to be improved for future commercial applications. Factors limiting the PCE of the PSCs include the low exploitation of sunlight due to the narrow absorption band of conjugated polymers, and the low charge‐transport efficiency in the devices due to the lower charge‐carrier mobility of the polymer photovoltaic materials. In this Research News article, recent progress in new conjugated polymer photovoltaic materials fabricated by our group and others is reviewed, including polythiophene (PT) and poly(thienylene vinylene) derivatives with conjugated side chains for a broad absorption band, crosslinked PT derivatives with conjugated bridges for higher hole mobility, and low‐bandgap donor–acceptor copolymers for broad, red‐shifted absorption to match the solar spectrum. 相似文献
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We report the effect of thermal annealing on the performance of polymer:polymer solar cells with a lithium fluoride (LiF) nanolayer inserted between active layer and electron-collecting electrode. The active layer was prepared using blend films of regioregular poly(3-hexylthiophene) (P3HT) and poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT). Film annealing and device annealing were separately performed at 150 °C for 30 min to understand the influence of the existence of LiF nanolayer during thermal annealing. Results showed that both film and device annealing did considerably improve the power conversion efficiency (PCE) of P3HT:F8BT solar cells though the PCE was higher in the case of device annealing. The surface analysis suggested that the improved device performance by thermal annealing is attributed partly to the formation of planar p-n junction structure in the P3HT:F8BT blend film during thermal annealing. 相似文献
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Cheng‐Hsuan Chou Wei Lek Kwan Ziruo Hong Li‐Min Chen Yang Yang 《Advanced materials (Deerfield Beach, Fla.)》2011,23(10):1282-1286
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Huiliang Sun Han Yu Yongqiang Shi Jianwei Yu Zhongxiang Peng Xianhe Zhang Bin Liu Junwei Wang Ranbir Singh Jaewon Lee Yongchun Li Zixiang Wei Qiaogan Liao Zhipeng Kan Long Ye He Yan Feng Gao Xugang Guo 《Advanced materials (Deerfield Beach, Fla.)》2020,32(43):2004183
Narrow-bandgap polymer semiconductors are essential for advancing the development of organic solar cells. Here, a new narrow-bandgap polymer acceptor L14, featuring an acceptor–acceptor (A–A) type backbone, is synthesized by copolymerizing a dibrominated fused-ring electron acceptor (FREA) with distannylated bithiophene imide. Combining the advantages of both the FREA and the A–A polymer, L14 not only shows a narrow bandgap and high absorption coefficient, but also low-lying frontier molecular orbital (FMO) levels. Such FMO levels yield improved electron transfer character, but unexpectedly, without sacrificing open-circuit voltage (Voc), which is attributed to a small nonradiative recombination loss (Eloss,nr) of 0.22 eV. Benefiting from the improved photocurrent along with the high fill factor and Voc, an excellent efficiency of 14.3% is achieved, which is among the highest values for all-polymer solar cells (all-PSCs). The results demonstrate the superiority of narrow-bandgap A–A type polymers for improving all-PSC performance and pave a way toward developing high-performance polymer acceptors for all-PSCs. 相似文献
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Jean Roncali Philippe Leriche Philippe Blanchard 《Advanced materials (Deerfield Beach, Fla.)》2014,26(23):3821-3838
An overview of some recent developments of the chemistry of molecular donor materials for organic photovoltaics (OPV) is presented. Although molecular materials have been used for the fabrication of OPV cells from the very beginning of the field, the design of molecular donors specifically designed for OPV is a relatively recent research area. In the past few years, molecular donors have been used in both vacuum‐deposited and solution‐processed OPV cells and both fields have witnessed impressive progress with power conversion efficiencies crossing the symbolic limit of 10 %. However, this progress has been achieved at the price of an increasing complexity of the chemistry of active materials and of the technology of device fabrication. This evolution probably inherent to the progress of research is difficult to reconcile with the necessity for OPV to demonstrate a decisive economic advantage over existing silicon technology. In this short review various classes of molecular donors are discussed with the aim of defining possible basic molecular structures that can combine structural simplicity, low molecular weight, synthetic accessibility, scalability and that can represent possible starting points for the development of simple and cost‐effective OPV materials. 相似文献
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High‐Performance Non‐Fullerene Polymer Solar Cells Based on a Pair of Donor–Acceptor Materials with Complementary Absorption Properties 
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下载免费PDF全文 Haoran Lin Shangshang Chen Zhengke Li Joshua Yuk Lin Lai Guofang Yang Terry McAfee Kui Jiang Yunke Li Yuhang Liu Huawei Hu Jingbo Zhao Wei Ma Harald Ade He Yan 《Advanced materials (Deerfield Beach, Fla.)》2015,27(45):7299-7304
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The development of conjugated alternating donor–acceptor (D–A) copolymers with various electron‐rich and electron‐deficient units in polymer backbones has boosted the power conversion efficiency (PCE) over 17% for polymer solar cells (PSCs) over the past two decades. However, further enhancements in PCEs for PSCs are still imperative to compensate their imperfect stability for fulfilling practical applications. Meanwhile development of these alternating D–A copolymers is highly demanding in creative design and syntheses of novel D and/or A monomers. In this regard, when being possible to adopt an existing monomer unit as a third component from its libraries, either a D′ unit or an A′ moiety, to the parent D–A type polymer backbones to afford conjugated D–A terpolymers, it will give a facile and cost‐effective method to improve their light absorption and tune energy levels and also interchain packing synergistically. Moreover, the rationally controlled stoichiometry for these components in such terpolymers also provides access for further fine‐tuning these factors, thus resulting in high‐performance PSCs. Herein, based on their unique features, the recent progress of conjugated D–A terpolymers for efficient PSCs is reviewed and it is discussed how these factors influence their photovoltaic performance, for providing useful guidelines to design new terpolymers toward high‐efficiency PSCs. 相似文献
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Zewdneh Genene Wendimagegn Mammo Ergang Wang Mats R. Andersson 《Advanced materials (Deerfield Beach, Fla.)》2019,31(22)
All‐polymer solar cells (all‐PSCs) based on n‐ and p‐type polymers have emerged as promising alternatives to fullerene‐based solar cells due to their unique advantages such as good chemical and electronic adjustability, and better thermal and photochemical stabilities. Rapid advances have been made in the development of n‐type polymers consisting of various electron acceptor units for all‐PSCs. So far, more than 200 n‐type polymer acceptors have been reported. In the last seven years, the power conversion efficiency (PCE) of all‐PSCs rapidly increased and has now surpassed 10%, meaning they are approaching the performance of state‐of‐the‐art solar cells using fullerene derivatives as acceptors. This review discusses the design criteria, synthesis, and structure–property relationships of n‐type polymers that have been used in all‐PSCs. Additionally, it highlights the recent progress toward photovoltaic performance enhancement of binary, ternary, and tandem all‐PSCs. Finally, the challenges and prospects for further development of all‐PSCs are briefly considered. 相似文献
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Yan Shao Guillermo C. Bazan Alan J. Heeger 《Advanced materials (Deerfield Beach, Fla.)》2008,20(6):1191-1193
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Jeffrey Peet Erin Brocker Yunhua Xu Guillermo C. Bazan 《Advanced materials (Deerfield Beach, Fla.)》2008,20(10):1882-1885