1. The nature of dynamic disorder in lead halide perovskite crystals (Conference Presentation)
- Author
-
Jonathan S. Owen, Costas Stoumpos, Andrew M. Rappe, Guilherme Szpak, Tony F. Heinz, Alexander N. Beecher, Yinsheng Guo, David Egger, Mercouri G. Kanatzidis, Liang Z. Tan, Leeor Kronik, Marcos A. Pimenta, Trevor D. Hull, Louis E. Brus, Fan Zheng, Omer Yaffe, and Octavi E. Semonin
- Subjects
010302 applied physics ,Materials science ,Condensed matter physics ,Band gap ,Halide ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Condensed Matter::Materials Science ,symbols.namesake ,Tetragonal crystal system ,Molecular dynamics ,Condensed Matter::Superconductivity ,0103 physical sciences ,symbols ,Condensed Matter::Strongly Correlated Electrons ,Orthorhombic crystal system ,0210 nano-technology ,Raman spectroscopy ,Raman scattering ,Perovskite (structure) - Abstract
We combine low frequency Raman scattering measurements with first-principles molecular dynamics (MD) to study the nature of dynamic disorder in hybrid lead-halide perovskite crystals. We conduct a comparative study between a hybrid (CH3NH3PbBr3) and an all-inorganic lead-halide perovskite (CsPbBr3). Both are of the general ABX3 perovskite formula, and have a similar band gap and structural phase sequence, orthorhombic at low temperature, changing first to tetragonal and then to cubic symmetry as temperature increases. In the high temperature phases, we find that both compounds show a pronounced Raman quasi-elastic central peak, indicating that both are dynamically disordered.
- Published
- 2016
- Full Text
- View/download PDF