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- W4321597968 abstract "The charge transfer between the donor and acceptor determines the photogenerated carrier density in organic solar cells. However, a fundamental understanding regarding the charge transfer at donor/acceptor interfaces with high-density traps has not been fully addressed. Herein, a general correlation between trap densities and charge transfer dynamics is established by adopting a series of high-efficiency organic photovoltaic blends. It is found that the electron transfer rates are reduced with increased trap densities, while the hole transfer rates are independent of trap states. The local charges captured by traps can induce potential barrier formation around recombination centers, leading to the suppression of electron transfer. For the hole transfer process, the thermal energy provides a sufficient driving force, which ensures an efficient transfer rate. As a result, a 17.18% efficiency is obtained for PM6:BTP-eC9-based devices with the lowest interfacial trap densities. This work highlights the importance of interfacial traps in charge transfer processes and proposes an underlying insight into the charge transfer mechanism at nonideal interfaces in organic heterostructures." @default.
- W4321597968 created "2023-02-24" @default.
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- W4321597968 date "2023-02-22" @default.
- W4321597968 modified "2023-10-16" @default.
- W4321597968 title "Correlating Charge Transfer Dynamics with Interfacial Trap States in High-Efficiency Organic Solar Cells" @default.
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- W4321597968 doi "https://doi.org/10.1021/acsami.2c21470" @default.
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