Efficient all-small-molecule organic solar cells processed with non-halogen solvent

Wei Gao, Ruijie Ma (), Top Archie Dela Peña, Cenqi Yan, Hongxiang Li (), Mingjie Li, Jiaying Wu, Pei Cheng, Cheng Zhong, Zhanhua Wei, Alex K.-Y. Jen () and Gang Li ()
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Wei Gao: Huaqiao University
Ruijie Ma: The Hong Kong Polytechnic University
Top Archie Dela Peña: The Hong Kong Polytechnic University
Cenqi Yan: Sichuan University
Hongxiang Li: Sichuan University
Mingjie Li: The Hong Kong Polytechnic University
Jiaying Wu: The Hong Kong University of Science and Technology
Pei Cheng: Sichuan University
Cheng Zhong: Wuhan University
Zhanhua Wei: Huaqiao University
Alex K.-Y. Jen: City University of Hong Kong
Gang Li: The Hong Kong Polytechnic University

Nature Communications, 2024, vol. 15, issue 1, 1-14

Abstract: Abstract All-small-molecule organic solar cells with good batch-to-batch reproducibility combined with non-halogen solvent processing show great potential for commercialization. However, non-halogen solvent processing of all-small-molecule organic solar cells are rarely reported and its power conversion efficiencies are very difficult to improve. Herein, we designed and synthesized a small molecule donor BM-ClEH that can take advantage of strong aggregation property induced by intramolecular chlorine-sulfur non-covalent interaction to improve molecular pre-aggregation in tetrahydrofuran and corresponding micromorphology after film formation. Tetrahydrofuran-fabricated all-small-molecule organic solar cells based on BM-ClEH:BO-4Cl achieved high power conversion efficiencies of 15.0% in binary device and 16.1% in ternary device under thermal annealing treatment. In contrast, weakly aggregated BM-HEH without chlorine-sulfur non-covalent bond is almost inefficient under same processing conditions due to poor pre-aggregation induced disordered π-π stacking, indistinct phase separation and exciton dissociation. This work promotes the development of non-halogen solvent processing of all-small-molecule organic solar cells and provides further guidance.

Date: 2024
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DOI: 10.1038/s41467-024-46144-8

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