Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 6, Pages 3238-3246Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202013053
Keywords
3D networks; chlorination; eco-compatible; non-fullerene acceptors; organic solar cells
Categories
Funding
- National Natural Science Foundation of China [21733005, 51903116, 21975115]
- Shenzhen Fundamental Research program [JCYJ20170817111214740, KQJSCX20180319114442157]
- Shenzhen Nobel Prize Scientists Laboratory Project [C17783101]
- Guangdong Provincial Key Laboratory of Catalysis [2020B121201002]
- Guangdong Innovative and Entrepreneurial Research Team Program [2016ZT06G587]
- Shenzhen Sci-Tech Fund [KYTDPT20181011104007]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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The performance of polymer solar cells processed by non-halogenated solvents was enhanced by designing and synthesizing a dissymmetric fused-ring acceptor BTIC-2Cl-gamma CF3, achieving a PCE of over 17% and showing significant advantages in storage and photo-stability, while extending the absorption peak to 852 nm.
To elevate the performance of polymer solar cells (PSC) processed by non-halogenated solvents, a dissymmetric fused-ring acceptor BTIC-2Cl-gamma CF3 with chlorine and trifluoromethyl end groups has been designed and synthesized. X-ray crystallographic data suggests that BTIC-2Cl-gamma CF3 has a 3D network packing structure as a result of H- and J-aggregations between adjacent molecules, which will strengthen its charge transport as an acceptor material. When PBDB-TF was used as a donor, the toluene-processed binary device realized a high power conversion efficiency (PCE) of 16.31 %, which improved to 17.12 % when PC71ThBM was added as the third component. Its efficiency of over 17 % is currently the highest among polymer solar cells processed by non-halogenated solvents. Compared to its symmetric counterparts BTIC-4Cl and BTIC-CF3-gamma, the dissymmetric BTIC-2Cl-gamma CF3 integrates their merits, and has optimized the molecular aggregations with excellent storage and photo-stability, and also extending the maximum absorption peak in film to 852 nm. The devices exhibit good transparency indicating a potential utilization in semi-transparent building integrated photovoltaics (ST-BIPV).
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