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Title: Dynamic behavior of CH3NH3PbI3 perovskite twin domains

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5041256· OSTI ID:1474602
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [3]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [3]; ORCiD logo [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS); Univ. of Tennessee, Knoxville, TN (United States). Department of Materials Science and Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
  3. Univ. of Tennessee, Knoxville, TN (United States). Department of Materials Science and Engineering

We report the recent discovery of twin domains in MAPbI3 perovskites has initiated contentious discussion on the ferroic nature of hybrid perovskites. Ferroelectric polarization is thought to facilitate the dissociation of photoinduced electron-hole pairs, helping to explain the extraordinary photovoltaic performance exhibited by this class of materials. Alternate to ferroelectricity, which has yet to be unambiguously established despite considerable efforts to do so, ferroelasticity was also proposed in these materials. Meanwhile, given the coupling of ionic states and ferroelectricity and the interconnected nature of defect chemistry and ferroelasticity, the electrochemical reactivity can no longer be ignored. In this work, using band excitation piezoresponse force microscopy, we reveal the variation in elasticity between adjacent domains, indicating the ferroelasticity and the difference in the crystallographic states of the twin domain. Moreover, using band excitation contact Kelvin probe force microscopy, we dynamically map the evolution of the twinning structure under electric bias. These results help decipher the effect of the twin domains on ionic mobility and ion diffusion pathways. Combining these results, we reveal the interaction of twin domains and ionic activity in this material. Furthermore, this work provides insights into the twinning structure in MAPbI3 and its potential effects on the hybrid perovskite optoelectronics.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1474602
Alternate ID(s):
OSTI ID: 1464317
Journal Information:
Applied Physics Letters, Vol. 113, Issue 7; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (11)

Ferroelectric Properties of Perovskite Thin Films and Their Implications for Solar Energy Conversion journal February 2019
Light‐Ferroic Interaction in Hybrid Organic–Inorganic Perovskites journal September 2019
Strain–Chemical Gradient and Polarization in Metal Halide Perovskites journal April 2020
Zur Rolle der Iodid‐Methylammonium‐Interaktion in der Ferroelektrizität in CH 3 NH 3 PbI 3 journal November 2019
Role of the Iodide–Methylammonium Interaction in the Ferroelectricity of CH 3 NH 3 PbI 3 journal November 2019
Probing the Microstructure of Methylammonium Lead Iodide Perovskite Solar Cells journal March 2019
Ferroelastic domains drive charge separation and suppress electron–hole recombination in all-inorganic halide perovskites: time-domain ab initio analysis journal January 2020
Dielectric and ferroic properties of metal halide perovskites journal January 2019
Twin domains modulate light-matter interactions in metal halide perovskites journal January 2020
Role of the iodide–methylammonium interaction in the ferroelectricity of CH3NH3PbI3 text January 2019
Ferroelectric Properties of Perovskite Thin Films and Their Implications for Solar Energy Conversion text January 2019

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