18.42% efficiency polymer solar cells enabled by terpolymer donors with optimal miscibility and energy levels
SCIE
SCOPUS
- Title
- 18.42% efficiency polymer solar cells enabled by terpolymer donors with optimal miscibility and energy levels
- Authors
- Liao, Zhihui; Hu, Dingqin; Tang, Hua; Huang, Peihao; Singh, Ranbir; 정세인; Cho, Kilwon; Kumar, Manish; Hou, Licheng; Chen, Qianqian; Yu, Weiyang; Chen, Haiyan; Yang, Ke; Kan, Zhipeng; Liu, Feng; Xiao, Zeyun; Li, Gang; Lu, Shirong
- Date Issued
- 2022-04
- Publisher
- Royal Society of Chemistry
- Abstract
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/115850
- DOI
- 10.1039/d1ta10644a
- ISSN
- 2050-7488
- Article Type
- Article
- Citation
- Journal of Materials Chemistry A, vol. 10, no. 14, page. 7878 - 7887, 2022-04
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