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18.42% efficiency polymer solar cells enabled by terpolymer donors with optimal miscibility and energy levels
Liao, Zhihui1,2; Hu, Dingqin1,2; Tang, Hua1,2,3; Huang, Peihao1,2; Singh, Ranbir4; Chung, Sein5; Cho, Kilwon5; Kumar, Manish6; Hou, Licheng1,2; Chen, Qianqian2
2022-02-26
摘要The rapid development of non-fullerene acceptors (NFAs) has placed increasing demands on polymer donors and there is still room for optimization of the currently available top-performing polymer donors to work perfectly with the state-of-the-art NFAs. To further develop and fine-tune the best-performing polymer donors, random ternary copolymerization is a simple and powerful strategy, in which the search for a suitable and easily accessible third component is the challenge. Herein, a series of terpolymer donors OPz11, OPz12, OPz13 and OPz14 are synthesized by incorporating varying fractions of the ester-substituted thiazole (E-Tz) unit into the D18 polymer. Notably, the subtle E-Tz content brings optimization in the energy levels, electrostatic potentials (ESPs), molecular aggregation, miscibility and morphology, as revealed by the open circuit voltage (V-OC) improvement from 856.1 to 865.3 mV, and fill-factor (FF) enhancement from 74.34% to 78.71%. Finally, an exciting power conversion efficiency (PCE) of 18.42% is obtained from OPz11:Y6 devices, and is among the highest values reported for PSCs. This work illustrates that the accessible E-Tz unit is a promising building block to construct terpolymer donors for high-performance organic photovoltaic cells, and random ternary copolymerization is a flexible and promising strategy for photovoltaic materials development.
DOI10.1039/d1ta10644a
发表期刊JOURNAL OF MATERIALS CHEMISTRY A
ISSN2050-7488
页码10
通讯作者Xiao, Zeyun(xiao.z@cigit.ac.cn) ; Li, Gang(gang.w.li@polyu.edu.hk) ; Lu, Shirong(lushirong@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000765847500001
语种英语