Space-confined growth of metal halide perovskite crystal films
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Space-confined growth of metal halide perovskite crystal films Linyi Li, Jinxin Liu, Mengqi Zeng, and Lei Fu () Country College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China © Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 20 June 2020 / Revised: 9 August 2020 / Accepted: 10 August 2020
ABSTRACT Metal halide perovskites, as a new generation of optoelectronic materials, have attracted a great deal of interest due to their remarkable intrinsic properties. Due to the excellent optoelectronic properties, the perovskite crystals are widely used in lasers, photodetectors, X-ray detectors and solar cells. Considering the device performance and fabrication requirements, proper thickness of the crystal is required to avoid carrier loss and simultaneously ensure sufficient light absorption, which can realize the full potential of its excellent carrier transport property. Thus, the fabrication of perovskite crystal in a thin film with an adjustable thickness is highly desirable. The space-confined method has been demonstrated to be an effective way of preparing perovskite with controlled thickness. In this method, the thickness of perovskite can be regulated flexibly in a geometric confined space. Moreover, the size, quality and architecture of perovskite crystal films are also major concerns for practical photoelectric devices, which can also be optimized by the space-confined method owing to its good adaptability towards various modified strategies. In a word, the space-confined method is not only a simple and conventional way to adjust the thickness of perovskite crystal films, but also provides a platform to optimize their size, quality and architecture through applying appropriate strategies to the confined space. Herein, we review the space-confined growth of perovskite crystal films. Particularly, various modified strategies based on the space-confined method applied to the optimization of thickness, size, quality and architecture are highlighted. Then the stability investigating and component regulating of perovskite crystal films would be also mentioned. Furthermore, the correlation between the perovskite thickness and the device performance is discussed. Finally, several key challenges and proposed solutions of perovskite thin films based on the space-confined method are discussed.
KEYWORDS space confinement, metal halide perovskite, thickness adjustment, controllable preparation
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Introduction
Metal halide perovskites have received intensive research interest due to their outstanding optoelectronic properties, including wide absorption range [1], high extinction coefficient [2], long electron-hole diffusion length [3], high carrier mobility [4, 5] and so on. Benefitting from these excellent properties, perovskites are promising candidates for constructing highperformance solar cells [6, 7] and photodetectors [8]. Thereinto, the photoelectric conversion efficiency of the device is mainly determined by two steps: light absorption a
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