Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 39, Pages 43984-43991Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c13085
Keywords
organic solar cells; negative offset; charge transfer; charge generation; chlorination
Funding
- National Natural Science Foundation of China (NSFC) [21734001, 51825301]
- China Postdoctoral Science Foundation [BX20190023]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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The energy offset, considered as the driving force for charge transfer between organic molecules, has significant effects on both charge separation and charge recombination in organic solar cells. Herein, we designed material systems with gradually shifting energy offsets, including both positive and negative values. Time-resolved spectroscopy was used to monitor the charge dynamics within the bulk heterojunction. It is striking to find that there is still charge transfer and charge generation when the energy offset reached -0.10 eV (ultraviolet photoelectron spectroscopy data). This work not only indicates the feasibility of the free carrier generation and the following charge separation under the condition of a negative offset but also elucidates the relationship between the charge transfer and the energy offset in the case of polymer chlorination.
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