Two-dimensional Overdamped Fluctuations of the Soft Perovskite Lattice in CsPbBr3
![Two-dimensional Overdamped Fluctuations of the Soft Perovskite Lattice in CsPbBr3 Two-dimensional Overdamped Fluctuations of the Soft Perovskite Lattice in CsPbBr3](https://neutrons.ornl.gov/sites/default/files/styles/rhpage640/public/SoftPerovskiteLattice.png?itok=wQz50AKh)
Scientific Achievement
Highly overdamped phonon modes are observed in CsPbBr3 extending across entire Brillouin zone edges, corresponding to correlated atomic motions in two-dimensional sheets.
Significance and Impact
The newly understood atomic motions directly impact electronic gap-edge states and hence the opto-electronic and thermal properties that are relevant for possible thermoelectric and photovoltaic applications of CsPbBr3 and related materials.
Research Details
- X-ray diffuse scattering also shows rod-like diffuse scattering features at the zone boundaries.
- ensity functional theory and ab initio molecular dynamics calculations corroborate the experimental observations.
“Two-dimensional overdamped fluctuations of the soft perovskite lattice in CsPbBr3,”
Tyson Lanigan-Atkins1,8, Xing He, Matthew Krogstad2, Daniel Pajerowski, Doug Abernathy, Guangyong N. M. N. Xu, Zhijun Xu Duck-Y. Chung, Mercouri Kanatzidis, Stephan Rosenkranz, Raymond Osborn and Olivier Delaire,
Nature Materials (2021).
DOI: https://doi.org/10.1038/s41563-021-00947-y