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Fused Benzothiadiazole: A Building Block for n‐Type Organic Acceptor to Achieve High‐Performance Organic Solar Cells
Author(s) -
Yuan Jun,
Zhang Yunqiang,
Zhou Liuyang,
Zhang Chujun,
Lau TszKi,
Zhang Guichuan,
Lu Xinhui,
Yip HinLap,
So Shu Kong,
Beaupré Serge,
Mainville Mathieu,
Johnson Paul A.,
Leclerc Mario,
Chen Honggang,
Peng Hongjian,
Li Yongfang,
Zou Yingping
Publication year - 2019
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.201807577
Subject(s) - organic solar cell , materials science , acceptor , electron acceptor , absorption (acoustics) , molar absorptivity , band gap , energy conversion efficiency , organic semiconductor , optoelectronics , fullerene , photochemistry , polymer , optics , organic chemistry , chemistry , physics , composite material , condensed matter physics
Narrow bandgap n‐type organic semiconductors (n‐OS) have attracted great attention in recent years as acceptors in organic solar cells (OSCs), due to their easily tuned absorption and electronic energy levels in comparison with fullerene acceptors. Herein, a new n‐OS acceptor, Y5, with an electron‐deficient‐core‐based fused structure is designed and synthesized, which exhibits a strong absorption in the 600–900 nm region with an extinction coefficient of 1.24 × 10 5 cm −1 , and an electron mobility of 2.11 × 10 −4 cm 2 V −1 s −1 . By blending Y5 with three types of common medium‐bandgap polymers (J61, PBDB‐T, and TTFQx‐T1) as donors, all devices exhibit high short‐circuit current densities over 20 mA cm −2 . As a result, the power conversion efficiency of the Y5‐based OSCs with J61, TTFQx‐T1, and PBDB‐T reaches 11.0%, 13.1%, and 14.1%, respectively. This indicates that Y5 is a universal and highly efficient n‐OS acceptor for applications in organic solar cells.