Journal
PHYSICAL REVIEW B
Volume 94, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.094301
Keywords
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
- Northwestern University
- E.I. DuPont de Nemours Co.
- Dow Chemical Company
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
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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.
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