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Single-Crystal Thin Films of Cesium Lead Bromide Perovskite Epitaxially Grown on Metal Oxide Perovskite (SrTiO3)
journal contribution
posted on 2017-09-05, 00:00 authored by Jie Chen, Darien J. Morrow, Yongping Fu, Weihao Zheng, Yuzhou Zhao, Lianna Dang, Matthew J. Stolt, Daniel D. Kohler, Xiaoxia Wang, Kyle J. Czech, Matthew P. Hautzinger, Shaohua Shen, Liejin Guo, Anlian Pan, John C. Wright, Song JinHigh-quality metal halide perovskite
single crystals have low defect
densities and excellent photophysical properties, yet thin films are
the most sought after material geometry for optoelectronic devices.
Perovskite single-crystal thin films (SCTFs) would be highly desirable
for high-performance devices, but their growth remains challenging,
particularly for inorganic metal halide perovskites. Herein, we report
the facile vapor-phase epitaxial growth of cesium lead bromide perovskite
(CsPbBr3) continuous SCTFs with controllable micrometer
thickness, as well as nanoplate arrays, on traditional oxide perovskite
SrTiO3(100) substrates. Heteroepitaxial single-crystal
growth is enabled by the serendipitous incommensurate lattice match
between these two perovskites, and overcoming the limitation of island-forming
Volmer–Weber crystal growth is critical for growing large-area
continuous thin films. Time-resolved photoluminescence, transient
reflection spectroscopy, and electrical transport measurements show
that the CsPbBr3 epitaxial thin film has a slow charge
carrier recombination rate, low surface recombination velocity (104 cm s–1), and low defect density of 1012 cm–3, which are comparable to those of
CsPbBr3 single crystals. This work suggests a general approach
using oxide perovskites as substrates for heteroepitaxial growth of
halide perovskites. The high-quality halide perovskite SCTFs epitaxially
integrated with multifunctional oxide perovskites could open up opportunities
for a variety of high-performance optoelectronics devices.
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High-quality metal halide perovskitemultifunctional oxide perovskiteshalide perovskite SCTFs epitaxiallyHeteroepitaxial single-crystal growthtransport measurements showserendipitous incommensurate latticemetal halide perovskitesvapor-phase epitaxial growthBromide Perovskite Epitaxially GrownCsPbBr 3CsPbBr 3 epitaxialMetal Oxide Perovskitefilmcharge carrier recombination rate
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