期刊
ADVANCED MATERIALS
卷 32, 期 46, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202004080
关键词
exciton transport; layered perovskites; organic cations; transient photoluminescence mapping
类别
资金
- National Science Foundation [DMR-1523617]
- Center for Hybrid Organic Inorganic Semiconductors for Energy (CHOISE), an Energy Frontier Research Center - DOE Office of Basic Energy Sciences, Office of Science
- UNC Research Opportunities Initiative (ROI) through Center of Hybrid Materials Enabled Electronic Technology (CH-MEET)
Layered perovskites have been employed for various optoelectronic devices including solar cells and light-emitting diodes for improved stability, which need exciton transport along both the in-plane and the out-of-plane directions. However, it is not clear yet what determines the exciton transport along the in-plane direction, which is important to understand its impact toward electronic devices. Here, by employing both steady-state and transient photoluminescence mapping, it is found that in-plane exciton diffusivities in layered perovskites are sensitive to both the number of layers and organic cations. Apart from exciton-phonon coupling, the octahedral distortion is revealed to significantly affect the exciton diffusion process, determined by temperature-dependent photoluminescence, light-intensity-dependent time-resolved photoluminescence, and density function theory calculations. A simple fluorine substitution to phenethylammonium for the organic cations to tune the structural rigidity and octahedral distortion yields a record exciton diffusivity of 1.91 cm(2) s(-1) and a diffusion length of 405 nm along the in-plane direction. This study provides guidance to manipulate exciton diffusion by modifying organic cations in layered perovskites.
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