Gehrmann, Christian and Egger, David A. (2019) Dynamic shortening of disorder potentials in anharmonic halide perovskites. NATURE COMMUNICATIONS, 10: 3141. ISSN 2041-1723,
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Halide perovskites are semiconductors that exhibit sharp optical absorption edges and small Urbach energies allowing for efficient collection of sunlight in thin-film photovoltaic devices. However, halide perovskites also exhibit large nuclear anharmonic effects and disorder, which is unusual for efficient optoelectronic materials and difficult to rationalize in view of the small Urbach energies that indicate a low amount of disorder. To address this important issue, the disorder potential induced for electronic states by the nuclear dynamics in various paradigmatic halide perovskites is studied with molecular dynamics and density functional theory. We find that the disorder potential is dynamically shortened due to the nuclear motions in the perovskite, such that it is short-range correlated, which is shown to lead to favorable distributions of band edge energies. This dynamic mechanism allows for sharp optical absorption edges and small Urbach energies, which are highly desired properties of any solar absorber material.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LEAD IODIDE PEROVSKITES; SOLAR-CELLS; TRANSPORT; FLUCTUATIONS; CRYSTAL; TIN; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group David Egger |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Apr 2020 08:22 |
| Last Modified: | 07 Apr 2020 08:22 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26627 |
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