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Understanding energetic disorder in electron-deficient-core-based non-fullerene solar cells

Science China Chemistry 2020年第8期63卷 1159-1168页

作者： Jun Yuan Chujun Zhang Honggang Chen Can Zhu Sin Hang Cheung Beibei Qiu Fangfang Cai Qingya Wei Wei Liu Hang Yin Rui Zhang Jidong Zhang Ye Liu Huotian Zhang Weifang Liu Hongjian Peng Junliang Yang Lei Meng Feng Gao Shukong So Yongfang Li Yingping Zou College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China Department of Physics and Institute of Advanced Materials Hong Kong Baptist UniversityHong KongChina Beijing National Laboratory for molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190China Department of Physics Chemistry and Biology(IFM)Linkoping UniversityLinkdping 58183Sweden State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicChangsha 410083China

Recent advances in material design for organic solar cells(OSCs)are primarily focused on developing near-infrared nonfullerene acceptors,typically A-DA′D-A type acceptors(where A abbreviates an electron-withdrawing moiety and D,an electron-donor moiety),to achieve high external quantum efficiency while maintaining low voltage ***,the charge transport is still constrained by unfavorable molecular conformations,resulting in high energetic disorder and limiting the device ***,a facile design strategy is reported by introducing the"wing"(alkyl chains)at the terminal of the DA′D central core of the A-DA′D-A type acceptor to achieve a favorable and ordered molecular orientation and therefore facilitate charge carrier *** from the reduced disorder,the electron mobilities could be significantly enhanced for the"wing"-containing *** carefully changing the length of alkyl chains,the mobility of acceptor has been tuned to match with that of donor,leading to a minimized charge imbalance factor and a high fill factor(FF).We further provide useful design strategies for highly efficient OSCs with high FF.

关键词： non-fullerene organic solar cells electron-deficient-core energetic disorder molecular design strategy

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