Department of Physics and Astronomy: Publications and Other Research

Evgeny Tsymbal Publications
ORCID IDs
Tsymbal http://orcid.org/0000-0002-6728-5549
Paudel https://orcid.org/0000-0002-9952-9435
Document Type
Article
Date of this Version
2016
Citation
Physical Review B (2016) 94: 195309
Abstract
The energetics and the electronic structure of methylammonium lead bromine (CH3NH3PbBr3) perovskite (001) surfaces are studied based on density functional theory. By examining the surface grand potential, we predict that the CH3NH3Br-terminated (001) surface is energetically more favorable than the PbBr2-terminated (001) surface, under thermodynamic equilibrium conditions of bulk CH3NH3PbBr3. The electronic structure of each of these two different surface terminations retains some of the characteristics of the bulk, while new surface states are found near band edges which may affect the photovoltaic performance in the solar cells based on CH3NH3PbBr3. The calculated electron affinity of CH3NH3PbBr3 reveals a sizable difference for the two surface terminations, indicating a possibility of tuning the band offset between the halide perovskite and adjacent electrode with proper interface engineering.
Comments
Copyright © 2016, American Physical Society. Used by permission