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A Fully Non‐fused Ring Acceptor with Planar Backbone and Near‐IR Absorption for High Performance Polymer Solar Cells
Author(s) -
Chen YaNan,
Li Miao,
Wang Yunzhi,
Wang Jing,
Zhang Ming,
Zhou Yuanyuan,
Yang Jianming,
Liu Yahui,
Liu Feng,
Tang Zheng,
Bao Qinye,
Bo Zhishan
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202010856
Subject(s) - organic solar cell , acceptor , energy conversion efficiency , electron acceptor , materials science , ring (chemistry) , absorption (acoustics) , planar , annealing (glass) , solar cell , photochemistry , polymer , chemistry , optoelectronics , organic chemistry , physics , computer graphics (images) , computer science , composite material , condensed matter physics
Fused‐ring electron acceptors have made significant progress in recent years, while the development of fully non‐fused ring acceptors has been unsatisfactory. Here, two fully non‐fused ring acceptors, o‐4TBC‐2F and m‐4TBC‐2F, were designed and synthesized. By regulating the location of the hexyloxy chains, o‐4TBC‐2F formed planar backbones, while m‐4TBC‐2F displayed a twisted backbone. Additionally, the o‐4TBC‐2F film showed a markedly red‐shifted absorption after thermal annealing, which indicated the formation of J‐aggregates. For fabrication of organic solar cells (OSCs), PBDB‐T was used as a donor and blended with the two acceptors. The o‐4TBC‐2F‐based blend films displayed higher charge mobilities, lower energy loss and a higher power conversion efficiency (PCE). The optimized devices based on o‐4TBC‐2F gave a PCE of 10.26 %, which was much higher than those based on m‐4TBC‐2F at 2.63 %, and it is one of the highest reported PCE values for fully non‐fused ring electron acceptors.