CH3NH3PbI3 perovskites: Ferroelasticity revealed
Evgheni Strelcov,Evgheni Strelcov,Qingfeng Dong,Tao Li,Jungseok Chae,Jungseok Chae,Yuchuan Shao,Yehao Deng,Alexei Gruverman,Jinsong Huang,Andrea Centrone +10 more
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TLDR
Experiments show that the configuration of CH3NH3PbI3 ferroelastic domains in single crystals and polycrystalline films can be controlled with applied stress, suggesting that strain engineering may be used to tune the properties of this material.Abstract:
Ferroelectricity has been proposed as a plausible mechanism to explain the high photovoltaic conversion efficiency in organic-inorganic perovskites; however, convincing experimental evidence in support of this hypothesis is still missing. Identifying and distinguishing ferroelectricity from other properties, such as piezoelectricity, ferroelasticity, etc., is typically nontrivial because these phenomena can coexist in many materials. In this work, a combination of microscopic and nanoscale techniques provides solid evidence for the existence of ferroelastic domains in both CH3NH3PbI3 polycrystalline films and single crystals in the pristine state and under applied stress. Experiments show that the configuration of CH3NH3PbI3 ferroelastic domains in single crystals and polycrystalline films can be controlled with applied stress, suggesting that strain engineering may be used to tune the properties of this material. No evidence of concomitant ferroelectricity was observed. Because grain boundaries have an impact on the long-term stability of organic-inorganic perovskite devices, and because the ferroelastic domain boundaries may differ from regular grain boundaries, the discovery of ferroelasticity provides a new variable to consider in the quest for improving their stability and enabling their widespread adoption.read more
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Room-temperature synthesis, growth mechanisms and opto-electronic properties of organic–inorganic halide perovskite CH3NH3PbX3 (X = I, Br, and Cl) single crystals
Maryam Bari,Hua Wu,Hua Wu,Alexei A. Bokov,Rana Faryad Ali,Hamel N. Tailor,Byron D. Gates,Zuo-Guang Ye +7 more
TL;DR: In this paper, the authors developed an effective synthetic technique by which the CH3NH3PbX3 (X = I, Br, and Cl) crystals were grown in polar solvents at room temperature.
Journal ArticleDOI
Thermal, ferroelastic, and structural properties near phase transitions of organic–inorganic perovskite type [NH3(CH2)3NH3]CdBr4 crystals
TL;DR: In this article, the thermal behavior and structural dynamics of organic-inorganic hybrid perovskite (NH3)(CH2)3(NH3)]CdBr4 crystals near phase transition temperatures, TC2 (=328 K) and TC1 (=363 K), were studied.
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Organic molecular dynamics and charge-carrier lifetime in lead iodide perovskite MAPbI <sub>3</sub>
TL;DR: In this article , a muon spin relaxation technique was used to probe the fluctuation of local magnetic fields, and the muon depolarization rate (Δ) of a prototype HOIP methylammonium lead iodide (MAPbI3) showed a sharp decrease with increasing temperature in two steps above 120 K and 190 K across the structural transition from orthorhombic to tetragonal structure at 162 K.
Journal ArticleDOI
Tuning spontaneous polarization and optical absorption by intercalating Sr–Cl-layers in organic–inorganic halide perovskite CH3NH3PbI3 thin films
Xiaodong Yang,Cheng Lu,Xinxin Wang,Baolin Wang,Gui-Xian Ge,Gui-Xian Ge,Guanghou Wang,Jianguo Wan +7 more
TL;DR: In this paper, a phase diagram for designing such a Sr-Cl-layer-inserted CH3NH3PbI3 thin film was designed to improve the photovoltaic properties.
Journal ArticleDOI
Effect of Methylene Chain Length on the Thermodynamic Properties, Ferroelastic Properties, and Molecular Dynamics of the Perovskite-type Layer Crystal [NH 3(CH 2) n NH 3]MnCl 4 ( n = 2, 3, and 4)
TL;DR: In this article, the structures and phase transitions of [NH3(CH2) n NH3]MnCl4 (n = 2, 3, and 4) crystals were confirmed through X-ray diffraction and differential scanning calorimetry (DSC) experiments.
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