Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 4, Pages 1384-1389Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c00025
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Funding
- National Key R&D Program of China [2018YFA0209100, 2017YFA0303703]
- National Natural Science Foundation of China [21922302, 21873047, 11574140, 91850105, 91833305, 11904168]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Fundamental Research Funds for the Central Universities
- Tang Scholar program
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Viscosity modifiers are widely applied to improve the mechanical compliance of organic optoelectronic devices. However, the effect of the viscosity additives on the charge dynamics remains poorly understood. Here, we report the observation of markedly different effects of a high-viscosity polymeric additive on the electron- and hole-transfer dynamics in all-polymer organic photovoltaic blends. By using ultrafast transient absorption spectroscopy, we determine that hole transfer from charge-transfer excitations in the acceptor is markedly promoted while the electron transfer from local excitations in the donor remains nearly unchanged upon introduction of viscosity additives into the blends. We argue that the modification of dielectric screening is the mechanism underlying the effect of the additive on the charge dynamics. This finding suggests a new strategy for designing high-performance flexible organic photovoltaic devices by manipulating the dielectric environment.
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