Kirchartz, Thomas and Markvart, Tom and Rau, Uwe and Egger, David A. (2018) Impact of Small Phonon Energies on the Charge-Carrier Lifetimes in Metal-Halide Perovskites. JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 9 (5). 939-+. ISSN 1948-7185,
Full text not available from this repository. (Request a copy)Abstract
Metal-halide perovskite (MHP) solar cells exhibit long nonradiative lifetimes as a crucial feature enabling high efficiencies. Long nonradiative lifetimes occur if the transfer of electronic into vibrational energy is slow due to, e.g., a low trap density, weak electron phonon coupling, or the requirement to release many phonons in the electronic transition. Here, we combine known material properties of MHPs with basic models for electron phonon coupling and multiphonon-transition rates in polar semiconductors. We find that the low phonon energies of MAPbI(3) lead to a strong dependence of recombination rates on trap position, which we deduce from the underlying physical effects determining nonradiative transitions. This is important for nonradiative recombination in MHPs, as it implies that they are rather insensitive to defects that are not at midgap energy, which can lead to long lifetimes. Therefore, the low phonon energies of MHPs are likely an important factor for their optoelectronic performance.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRON-HOLE RECOMBINATION; SOLAR-CELLS; VIBRATIONAL-RELAXATION; GAP LAW; MU-S; SEMICONDUCTORS; EFFICIENCY; INTERPLAY; CAPTURE; CATIONS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group David Egger |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 19 Mar 2020 10:14 |
| Last Modified: | 19 Mar 2020 10:14 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14984 |
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