期刊
ORGANIC ELECTRONICS
卷 92, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.orgel.2021.106130
关键词
Polymer solar cells; Wide bandgap polymer donors; Backbone structure regulation
资金
- National Key Research and Development Program of China - MOST [2019YFA0705900]
- National Natural Science Foundation of China [51820105003, 21734008, 61904181]
- Basic and Applied Basic Research Major Program of Guangdong Province [2019B030302007]
- ACAP fellowship - Australian government through the Australian Renewable Energy Agency (ARENA)
The miscibility and morphology of the active layers significantly affect the photovoltaic performance of polymer solar cells (PSCs). Chemical strategies, especially molecular design, are crucial for polymer donor materials. In this study, two wide bandgap D-A copolymer donors were designed and synthesized, leading to a significant increase in power conversion efficiency with m-ITIC as the acceptor by manipulating molecular distortion.
Miscibility and morphology of the active layers have significant influence on the photovoltaic performance of polymer solar cells (PSCs). Chemical strategies, especially molecular structure design, have been proven to be crucial for polymer donor materials. In this work, two wide bandgap D-A copolymer donors composed of tripropylsilyl substituted bithienyl-benzodithiophene as donor (D) unit and dialkyl substituted bithiazole as acceptor (A) unit were designed and synthesized. By introducing thiophene ?-bridges into the backbone, the miscibility and morphological properties of the materials are effectively tuned, leading to tremendous progress in power conversion efficiency from 0.95% to 10.73% with m-ITIC as the acceptor. The results demonstrate that manipulating molecular distortion can be an effective strategy to regulate molecular self-assembly behavior of the polymer donors and achieve excellent aggregation properties, blend miscibility, and photovoltaic performance of the PSCs.
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