Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201906809
Keywords
ambient stability; benzo[1; 2-b; 4; 5-b ']difuran; copolymer; organic solar cells; power conversion efficiency
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Funding
- National Natural Science Foundation of China (NSFC) [21674007, 51825301, 21734001]
- National Research Foundation (NRF) of Korea [NRF-2016M1A2A2940911, 2019R1A6A1A11044070]
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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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