期刊
CHINESE JOURNAL OF CHEMICAL PHYSICS
卷 34, 期 6, 页码 751-760出版社
CHINESE PHYSICAL SOC
DOI: 10.1063/1674-0068/cjcp2109179
关键词
Electron transfer; Organic solar cells; Charge-transfer interaction
资金
- National Key R&D Program of China [2018YFA0209100, 2017YFA0303703]
- National Natural Science Foundation of China [21922302, 21873047, 91850105, 91833305]
- Fundamental Research Funds for the Central Universities [020414380126]
- Tang Scholar Program
Cyano substitution enhances intermolecular charge-transfer interaction in all-small-molecule blends, promoting ultrafast electron transfer and improving device performance. Delocalized excitations from cyanided donors undergo rapid electron transfer, while locally excited states without cyano substitution are not actively involved in charge separation.
Cyano substitution has been established as a viable approach to optimize the performance of all-small-molecule organic solar cells. However, the effect of cyano substitution on the dynamics of photo-charge generation remains largely unexplored. Here, we report an ultrafast spectroscopic study showing that electron transfer is markedly promoted by enhanced intermolecular charge-transfer interaction in all-small-molecule blends with cyanided donors. The delocalized excitations, arising from intermolecular interaction in the moiety of cyano-substituted donor, undergo ultrafast electron transfer with a lifetime of similar to 3 ps in the blend. In contrast, some locally excited states, surviving in the film of donor without cyano substitution, are not actively involved in the charge separation. These findings well explain the performance improvement of devices with cyanided donors, suggesting that manipulating intermolecular interaction is an efficient strategy for device optimization.
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