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Crystals 2018, 8(5), 216;

Twin Domains in Organometallic Halide Perovskite Thin-Films

State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
Author to whom correspondence should be addressed.
Received: 30 March 2018 / Revised: 25 April 2018 / Accepted: 11 May 2018 / Published: 16 May 2018
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The perovskite is a class of material with crystalline structure similar to CaTiO3. In recent years, the organic-inorganic hybrid metallic halide perovskite has been widely investigated as a promising material for a new generation photovoltaic device, whose power conversion efficiency (PCE) record reaches 22.7%. One of its underlying morphological characteristics is the twin domain within those sub-micron sized crystal grains in perovskite thin films. This is important for discussion since it could be the key for understanding the fundamental mechanism of the device’s high performance, such as long diffusion distance and low recombination rate. This review aims to summarize studies on twin domains in perovskite thin films, in order to figure out its importance, guide the current studies on mechanism, and design new devices. Firstly, we introduce the research history and characteristics of widely known twin domains in inorganic perovskite BaTiO3. We then focus on the impact of the domain structure emerging in hybrid metallic halide perovskite thin films, including the observation and discussion on ferroelectricity/ferroelasity. The theoretical analysis is also presented in this review. Finally, we present a spectroscopic method, which can reveal the generality of twin domains within perovskite thin films. We anticipate that this summary on the structural and physical properties of organometallic halide perovskite will help to understand and improve the high-performance of photovoltaic devices. View Full-Text
Keywords: perovskite; twin domains; ferroelectricity; ferroelasity perovskite; twin domains; ferroelectricity; ferroelasity

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Liu, W.; Liu, Y.; Wang, J.; Wu, C.; Liu, C.; Xiao, L.; Chen, Z.; Wang, S.; Gong, Q. Twin Domains in Organometallic Halide Perovskite Thin-Films. Crystals 2018, 8, 216.

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