期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 35, 页码 8644-8651出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c01909
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资金
- MEXT JSPS [19H02550, 18H05205, 20A201]
- JSPS KAKENHI [JP20H05831, JP20H05832]
- Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials
- Photoexcitonix Program
- Hokkaido University Nanotechnology PLATFORM
- MEXT
- Grants-in-Aid for Scientific Research [20A201, 18H05205] Funding Source: KAKEN
This study reveals the distance-dependent and diffusion-controlled interfacial electron transfer across perovskite-electron acceptor heterojunction films. Perovskite nanocrystals exhibit long-range carrier migration in self-assembled films, while acceptors quench photoluminescence intensity without affecting lifetime. The research underscores the importance of interfacial electron transfer in perovskite films.
Interfacial electron transfer across perovskite-electron acceptor heterojunctions plays a significant role in the power-conversion efficiency of perovskite solar cells. Thus, electron donor-acceptor thin films of halide perovskite nanocrystals receive considerable attention. Nevertheless, understanding and optimizing distance- and thickness-dependent electron transfer in perovskite-electron acceptor heterojunctions are important. We reveal the distance-dependent and diffusion-controlled interfacial electron transfer across donor-acceptor heterojunction films formed by formamidinium or cesium lead bromide (FAPbBr(3)/CsPbBr3) perovskite nanocrystals with TiO2/C-60. Self-assembled nanocrystal films prepared from FAPbBr(3) show a longer photoluminescence lifetime than a solution, showing a long-range carrier migration. The acceptors quench the photoluminescence intensity but not the lifetime in a solution, revealing a static electron transfer. Conversely, the electron transfer in the films changes from dynamic to static by moving toward the donor-acceptor interface. While radiative recombination dominates the electron transfer at 800 mu m or farther, the acceptors scavenge the photogenerated carriers within 100 mu m. This research highlights the significance of interfacial electron transfer in perovskite films.
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