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Fused Hexacyclic Nonfullerene Acceptor with Strong Near‐Infrared Absorption for Semitransparent Organic Solar Cells with 9.77% Efficiency
Author(s) -
Wang Wei,
Yan Cenqi,
Lau TszKi,
Wang Jiayu,
Liu Kuan,
Fan Yan,
Lu Xinhui,
Zhan Xiaowei
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201701308
Subject(s) - organic solar cell , materials science , energy conversion efficiency , acceptor , electron acceptor , tandem , band gap , absorption (acoustics) , optoelectronics , thiophene , photochemistry , polymer , organic chemistry , chemistry , physics , composite material , condensed matter physics
A fused hexacyclic electron acceptor, IHIC, based on strong electron‐donating group dithienocyclopentathieno[3,2‐ b ]thiophene flanked by strong electron‐withdrawing group 1,1‐dicyanomethylene‐3‐indanone, is designed, synthesized, and applied in semitransparent organic solar cells (ST‐OSCs). IHIC exhibits strong near‐infrared absorption with extinction coefficients of up to 1.6 × 10 5 m −1 cm −1 , a narrow optical bandgap of 1.38 eV, and a high electron mobility of 2.4 × 10 −3 cm 2 V −1 s −1 . The ST‐OSCs based on blends of a narrow‐bandgap polymer donor PTB7‐Th and narrow‐bandgap IHIC acceptor exhibit a champion power conversion efficiency of 9.77% with an average visible transmittance of 36% and excellent device stability; this efficiency is much higher than any single‐junction and tandem ST‐OSCs reported in the literature.