期刊
SCIENCE CHINA-CHEMISTRY
卷 63, 期 12, 页码 1785-1792出版社
SCIENCE PRESS
DOI: 10.1007/s11426-020-9826-4
关键词
all-polymer solar cells; polymer acceptors; energy level modulation; photovoltage; energy loss
资金
- Shenzhen Science and Technology Innovation Commission [JCYJ20170817105905899, JCYJ20180504165709042]
- National Natural Science Foundation of China [21801124, 21903017]
- China Scholarship Council Fund [201906010074]
- Center for Computational Science and Engineering of Southern University of Science and Technology (SUSTech)
The open-circuit voltage (V-oc) of all-polymer solar cells (all-PSCs) is typically lower than 0.9 V even for the most efficient ones. Large energy loss is the main reason for limitingV(oc)and efficiency of all-PSCs. Herein, through materials design using electron deficient building blocks based on bithiophene imides, the lowest unoccupied molecular orbital (LUMO) energy levels of polymer acceptors can be effectively tuned, which resulted in a reduced energy loss induced by charge generation and recombination loss due to the suppressed charge-transfer (CT) state absorption. Despite a negligible driving force, all-PSC based on the polymer donor and acceptor combination with well-aligned energy levels exhibited efficient charge transfer and achieved an external quantum efficiency over 10% while maintaining a largeV(oc)of 1.02 V, leading to a 9.21% efficiency. Through various spectroscopy approaches, this work sheds light on the mechanism of energy loss in all-PSCs, which paves an avenue to achieving efficient all-PSCs with largeV(oc)and drives the further development of all-PSCs.
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