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Effect of Alkylsilyl Side‐Chain Structure on Photovoltaic Properties of Conjugated Polymer Donors
Author(s) -
Bin Haijun,
Yang Yankang,
Peng Zhengxing,
Ye Long,
Yao Jia,
Zhong Lian,
Sun Chenkai,
Gao Liang,
Huang He,
Li Xiaojun,
Qiu Beibei,
Xue Lingwei,
Zhang ZhiGuo,
Ade Harald,
Li Yongfang
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201702324
Subject(s) - side chain , materials science , polymer , conjugated system , photovoltaic system , polymer solar cell , alkyl , acceptor , energy conversion efficiency , band gap , homo/lumo , chemical engineering , polymer chemistry , organic chemistry , optoelectronics , molecule , chemistry , composite material , ecology , physics , engineering , biology , condensed matter physics
Side‐chain engineering is an important strategy for optimizing photovoltaic properties of organic photovoltaic materials. In this work, the effect of alkylsilyl side‐chain structure on the photovoltaic properties of medium bandgap conjugated polymer donors is studied by synthesizing four new polymers J70 , J72 , J73 , and J74 on the basis of highly efficient polymer donor J71 by changing alkyl substituents of the alkylsilyl side chains of the polymers. And the photovoltaic properties of the five polymers are studied by fabricating polymer solar cells (PSCs) with the polymers as donor and an n‐type organic semiconductor (n‐OS) m ‐ITIC as acceptor. It is found that the shorter and linear alkylsilyl side chain could afford ordered molecular packing, stronger absorption coefficient, higher charge carrier mobility, thus results in higher J sc and fill factor values in the corresponding PSCs. While the polymers with longer or branched alkyl substituents in the trialkylsilyl group show lower‐lying highest occupied molecular orbital energy levels which leads to higher V oc of the PSCs. The PSCs based on J70 : m ‐ITIC and J71 : m ‐ITIC achieve power conversion efficiency (PCE) of 11.62 and 12.05%, respectively, which are among the top values of the PSCs reported in the literatures so far.