期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 19, 页码 11734-11740出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta02075g
关键词
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资金
- National Natural Science Foundation of China [51873177, 21875204]
- group of Advanced Photoelectricity and Supramolecular Functional Materials of the Ministry of Education [IRT-17R90]
- Hunan 2011 Collaborative Innovation Centre of Chemical Engineering & Technology with Environmental Benignity and Effective Resource Utilization
A large-bandgap donor, BTBR-2F, has been designed and synthesized based on noncovalent conformational locking to achieve more complementary absorption with a PM6:Y6 blend in the near-ultraviolet region. The ternary blend film with 20% BTBR-2F achieves the best morphology and highest efficiency.
A large-bandgap donor, BTBR-2F, based on noncovalent conformational locking has been designed and synthesized to achieve more complementary absorption with a PM6:Y6 blend in the near-ultraviolet region. The ternary blend film with 20% BTBR-2F achieves the best morphology with a nanofibrous network structure and small domain size, which results in the most efficient exciton dissociation, highest charge mobilities, and lowest charge recombination. Moreover, BTBR-2F possesses lower HOMO and LUMO energy levels than PM6, which leads to more efficient energy/charge transfer and higher V-oc in ternary OSCs. Therefore, the ternary device with 20% BTBR-2F achieves the highest efficiency of 17.38%, with a V-oc of 0.859 V, J(sc) of 27.30 mA cm(-2), and FF of 74.11%. The study presents an efficient noncovalent conformational locking strategy to tune the energy levels, absorption band and molecular aggregation of a small molecular donor for high-performance ternary organic solar cells with comprehensively improved photovoltaic parameters.
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