1. Dynamic disorder in ABX3 (A=3D CH3NH3, Cs; B=3D Pb; X=3D Br3, CI3) perovskites
- Author
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Omer Yaffe, Marcos A. Pimenta, Jonathan S. Owen, Louis E. Brus, Driele von Dreifus, Octavi E. Semonin, Guilherme Szpak, Alexander N. Beecher, Yinsheng Guo, and Trevor D. Hull
- Subjects
0301 basic medicine ,Materials science ,Band gap ,Energy conversion efficiency ,02 engineering and technology ,computer.file_format ,021001 nanoscience & nanotechnology ,03 medical and health sciences ,Tetragonal crystal system ,symbols.namesake ,Crystallography ,030104 developmental biology ,Octahedron ,symbols ,Orthorhombic crystal system ,ABX test ,0210 nano-technology ,computer ,Raman scattering ,Perovskite (structure) - Abstract
Lead-halide hybrid perovskite crystals have emerged as potentially materials for solar cells due to their power conversion efficiency over 20% [1]. In this work we conduct a comparative study between two hybrids (CH 3 NH 3 PbBr 3 and CH 3 NH 3 Pba 3 ) and an all-inorganic lead-halide perovskite (CsPbBr 3 ). Both have the general ABX 3 perovskite formula, with similar band gap (2.2 eV) and similar structural phase sequence, orthorhombic at low temperature, changing to tetragonal and then to cubic as temperature is increased [2]. Theoretical studies suggested that dynamic disorder, imposed by the rotation of anisotropic organic molecules in the inorganic octahedral network, plays an important role in the high photovoltaic activity presented by this perovskites [3,4].
- Published
- 2017
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