Non-Fullerene Organic Solar Cells Based on Benzo[1,2-b:4,5-b ']difuran-Conjugated Polymer with 14% Efficiency
- Authors
- Li, Xueshan; Weng, Kangkang; Ryu, Hwa Sook; Guo, Jing; Zhang, Xuning; Xia, Tian; Fu, Huiting; Wei, Donghui; Min, Jie; Zhang, Yuan; Woo, Han Young; Sun, Yanming
- Issue Date
- 2월-2020
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- ambient stability; benzo[1; 2-b; 4; 5-b ' ]difuran; copolymer; organic solar cells; power conversion efficiency
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.30, no.6
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 30
- Number
- 6
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/57849
- DOI
- 10.1002/adfm.201906809
- ISSN
- 1616-301X
- Abstract
- The development of high-performance donor polymers is important for obtaining high power conversion efficiencies (PCEs) of non-fullerene polymer solar cells (PSCs). Currently, most high-efficiency PSCs are fabricated with benzo[1,2-b:4,5-b ']dithiophene (BDT)-based conjugated polymers. The photovoltaic performance of benzo[1,2-b:4,5-b ']difuran (BDF)-based copolymers has lagged far behind that of BDT-based counterparts. In this study, a novel BDF-based copolymer L2 is designed and synthesized, in which BDF and benzotriazole (BTz) building blocks have been used as the electron-sufficient and deficient units, respectively. When blending with a non-fullerene small molecule acceptor (SMA), TTPT-T-4F, the L2-based device exhibits a remarkably high PCE of 14.0%, which is higher than that of the device fabricated by its analogue BDT copolymer (12.72%). Moreover, PSCs based on the L2:TTPT-T-4F blend demonstrate excellent ambient stability with 92% of its original PCE remaining after storage in air for 1800 h. Thus, BDF is a promising electron-donating unit, and the BDF-based copolymers can be competitive or even surpass the performance of BDT-based counterparts.
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