Selenium-Substitution Asymmetric Acceptor Enables Efficient Binary Organic Solar Cells over 18.3 via Regulating Molecular Stacking and Phase Separation

Jingyu Shi; Zhenyu Chen; Hui LiuYi QiuShuncheng YangWei SongZiyi Ge

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Selenium-Substitution Asymmetric Acceptor Enables Efficient Binary Organic Solar Cells over 18.3 via Regulating Molecular Stacking and Phase Separation

机译：Selenium-Substitution Asymmetric Acceptor Enables Efficient Binary Organic Solar Cells over 18.3 via Regulating Molecular Stacking and Phase Separation

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Substantial efforts of A-DA′D-A type non-fullerene acceptors (NFAs)molecular design have impelled power conversion efficiency (PCE) of singlejunction organic solar cells (OSCs) to exceed 19. Asymmetric geometrystrategy, selenium-substitution, and end-group engineering are proven to beeffective modification methods. Here, two novel selenium substitutionasymmetric NFAs, AsymSSe-2F, and AsymSSe-2Cl, are synthesized toinvestigate the synergistic modification effects on device performancecompared with symmetric Y6. When blending AsymSSe-2F with thewide-bandgap and high crystallinity polymer D18, a remarkable PCE of18.31 is yielded, and an excellent fill factor of 79.46 is achieved, which isattributed to the broadened absorption, enhanced - stacking, balancedcarrier mobilities, and fine phase-separation morphology. Notably, among thereported selenium-substituted asymmetric NFAs based OSCs, especiallycombined with the seldom-reported D18, this PCE is top-ranked in binary bulkheterojunction organic solar cells. This work indicates that the combinedmodification of asymmetric geometry and selenium substitution in NFAs is apromising strategy for fabricating high performance OSCs.

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来源
《Advanced energy materials》 |2023年第29期|2301292.1-2301292.10|共10页
作者
Jingyu Shi; Zhenyu Chen; Hui LiuYi QiuShuncheng YangWei SongZiyi Ge;
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作者单位

Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Zhejiang P. R. China,Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049, P. R. China;

Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Zhejiang P. R. China;

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正文语种英语
中图分类能源与动力工程;
关键词
asymmetry strategies; non-fullerene acceptors; organic solar cells; selenium-substitution;

Selenium-Substitution Asymmetric Acceptor Enables Efficient Binary Organic Solar Cells over 18.3 via Regulating Molecular Stacking and Phase Separation

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