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    Understanding the effect of N2200 on performance of J71: ITIC bulk heterojunction in ternary non-fullerene solar cells

    Year: 2019

    Journal: Org. Electron., Volume 71, AUG, page 65–71

    Authors: Guo, Xuewen; Li, Danqin; Zhang, Yuexing; Jan, Ming; Xu, Jinqiu; Wang, Zhiquan; Li, Bo; Xiong, Shaobing; Li, Yanqing; Liu, Feng; Tang, Jianxin; Duan, Chungang; Fahlman, Mats; Bao, Qinye

    Organizations: National Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [11604099, 21875067, 51873138, 51811530011]; Shanghai Rising -Star [19QA1403100]; Shanghai Science and Technology Innovation Action Plan [17JC1402500]; National Key Project for Basic Research of ChinaNational Basic Research Program of China [2017YFA0303403]; Swedish Research CouncilSwedish Research CouncilEuropean Commission [2016-05498]; Swedish Government Strategic Research Area in Materials Science on Advanced Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]; STINT grant [CH2017-7163]

    Keywords: None-fullerene; Interface; Charge recombination; Efficiency; Ternary organic solar cells

    None-fullerene solar cells with ternary architecture have attracted much attention because it is an effective approach for boosting the device power conversion efficiency. Here, the crystalline polymer N2200 as the third component is integrated into J71: ITIC bulk heterojunction. A series of characterizations indicate that N2200 could increase photo-harvesting, balanced hole and electron mobilities, enhanced exciton dissociation, and suppressed charge recombination, which result in the comprehensive improvement of open circuit voltage, short circuit current and fill factor in the device. Moreover, after introduction of N2200, the morphology of the ternary active layer is optimized, and the film crystallinity is improved. This work demonstrates that adding a small quantity of high crystallization acceptor into non-fullerene donor: acceptor mixture is a promising strategy toward developing high-performance organic solar cells.
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