Alkyl Side-Chain Engineering in Wide-Bandgap Copolymers Leading to Power Conversion Efficiencies over 10.

Liu, Tao; Pan, Xuexue; Meng, Xiangyi; Liu, Yu; Wei, Donghui; Ma, Wei; Huo, Lijun; Sun, Xiaobo et al. · Adv Mater · 2017

basic_science · Level V

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Abstract

A series of wide-bandgap (WBG) copolymers with different alkyl side chains are synthesized. Among them, copolymer PBT1-EH with moderatly bulky side chains on the acceptor unit shows the best photovoltaic performance with power conversion efficiency over 10%. The results suggest that the alkyl side-chain engineering is an effective strategy to further tuning the optoelectronic properties of WBG copolymers.