Single-Crystal Thin Films of Cesium Lead Bromide Perovskite Epitaxially Grown on Metal Oxide Perovskite (SrTiO<sub>3</sub>)

Published on 2017-09-14T04:29:35Z (GMT) by
High-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 (CsPbBr<sub>3</sub>) continuous SCTFs with controllable micrometer thickness, as well as nanoplate arrays, on traditional oxide perovskite SrTiO<sub>3</sub>(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 CsPbBr<sub>3</sub> epitaxial thin film has a slow charge carrier recombination rate, low surface recombination velocity (10<sup>4</sup> cm s<sup>–1</sup>), and low defect density of 10<sup>12</sup> cm<sup>–3</sup>, which are comparable to those of CsPbBr<sub>3</sub> 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.

Cite this collection

Chen, Jie; Morrow, Darien J.; Fu, Yongping; Zheng, Weihao; Zhao, Yuzhou; Dang, Lianna; Stolt, Matthew J.; Kohler, Daniel D.; Wang, Xiaoxia; Czech, Kyle J.; Hautzinger, Matthew P.; Shen, Shaohua; Guo, Liejin; Pan, Anlian; Wright, John C.; Jin, Song (2017): Single-Crystal

Thin Films of Cesium Lead Bromide Perovskite

Epitaxially Grown on Metal Oxide Perovskite (SrTiO3). ACS Publications.

https://doi.org/10.1021/jacs.7b07506

Retrieved: 17:24, Nov 17, 2017 (GMT)