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- Title
Efficient all-small-molecule organic solar cells processed with non-halogen solvent.
- Authors
Gao, Wei; Ma, Ruijie; Dela Peña, Top Archie; Yan, Cenqi; Li, Hongxiang; Li, Mingjie; Wu, Jiaying; Cheng, Pei; Zhong, Cheng; Wei, Zhanhua; Jen, Alex K.-Y.; Li, Gang
- 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. The development of non-halogen solvent processed all-small-molecule organic solar cells was challenging. Here, the authors employ a small molecule donor with strong aggregation property to improve molecular pre-aggregation in tetrahydrofuran, realizing ternary device with efficiency of 16.1%.
- Subjects
SOLAR cells; PHASE separation; SMALL molecules; SOLVENTS; TETRAHYDROFURAN
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-46144-8