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Title: Lattice dynamics and the nature of structural transitions in organolead halide perovskites

Abstract

Organolead halide perovskites are a family of hybrid organic-inorganic compounds whose remarkable optoelectronic properties have been under intensive scrutiny in recent years. Here we use inelastic x-ray scattering to study low-energy lattice excitations in single crystals of methylammonium lead iodide and bromide perovskites. Our findings confirm the displacive nature of the cubic-to-tetragonal phase transition, which is further shown, using neutron and x-ray diffraction, to be close to a tricritical point. Lastly, we detect quasistatic symmetry-breaking nanodomains persisting well into the high-temperature cubic phase, possibly stabilized by local defects. These findings reveal key structural properties of these materials, and also bear important implications for carrier dynamics across an extended temperature range relevant for photovoltaic applications.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Natural Sciences and Engineering Research Council of Canada (NSERC)
OSTI Identifier:
1340303
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 94; Journal Issue: 9
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Comin, Riccardo, Crawford, Michael K., Said, Ayman H., Herron, Norman, Guise, William E., Wang, Xiaoping, Whitfield, Pamela S., Jain, Ankit, Gong, Xiwen, McGaughey, Alan J. H., and Sargent, Edward H. Lattice dynamics and the nature of structural transitions in organolead halide perovskites. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.094301.
Comin, Riccardo, Crawford, Michael K., Said, Ayman H., Herron, Norman, Guise, William E., Wang, Xiaoping, Whitfield, Pamela S., Jain, Ankit, Gong, Xiwen, McGaughey, Alan J. H., & Sargent, Edward H. Lattice dynamics and the nature of structural transitions in organolead halide perovskites. United States. doi:10.1103/PhysRevB.94.094301.
Comin, Riccardo, Crawford, Michael K., Said, Ayman H., Herron, Norman, Guise, William E., Wang, Xiaoping, Whitfield, Pamela S., Jain, Ankit, Gong, Xiwen, McGaughey, Alan J. H., and Sargent, Edward H. Fri . "Lattice dynamics and the nature of structural transitions in organolead halide perovskites". United States. doi:10.1103/PhysRevB.94.094301.
@article{osti_1340303,
title = {Lattice dynamics and the nature of structural transitions in organolead halide perovskites},
author = {Comin, Riccardo and Crawford, Michael K. and Said, Ayman H. and Herron, Norman and Guise, William E. and Wang, Xiaoping and Whitfield, Pamela S. and Jain, Ankit and Gong, Xiwen and McGaughey, Alan J. H. and Sargent, Edward H.},
abstractNote = {Organolead halide perovskites are a family of hybrid organic-inorganic compounds whose remarkable optoelectronic properties have been under intensive scrutiny in recent years. Here we use inelastic x-ray scattering to study low-energy lattice excitations in single crystals of methylammonium lead iodide and bromide perovskites. Our findings confirm the displacive nature of the cubic-to-tetragonal phase transition, which is further shown, using neutron and x-ray diffraction, to be close to a tricritical point. Lastly, we detect quasistatic symmetry-breaking nanodomains persisting well into the high-temperature cubic phase, possibly stabilized by local defects. These findings reveal key structural properties of these materials, and also bear important implications for carrier dynamics across an extended temperature range relevant for photovoltaic applications.},
doi = {10.1103/PhysRevB.94.094301},
journal = {Physical Review B},
number = 9,
volume = 94,
place = {United States},
year = {Fri Sep 09 00:00:00 EDT 2016},
month = {Fri Sep 09 00:00:00 EDT 2016}
}