Carrier Lifetimes and Polaronic Mass Enhancement in the Hybrid Halide Perovskite CH3NH3PbI3 from Multiphonon Fröhlich Coupling
(2018) Physical Review Letters — Vol. 121, n° 8, p. 86402 (2018)
Files
Schlipf2018.pdf
Open Access - Adobe PDF
- 963.73 KB
Details
- Authors
- Abstract
- We elucidate the nature of the electron-phonon interaction in the archetypal hybrid perovskite CH3NH3PbI3 using ab initio many-body calculations and an exactly solvable model. We demonstrate that electrons and holes near the band edges primarily interact with three distinct groups of longitudinaloptical vibrations, in order of importance: the stretching of the Pb—I bond, the bending of the Pb—I—Pb bonds, and the libration of the organic cations. These polar phonons induce ultrafast intraband carrier relaxation over timescales of 6–30 fs and yield polaron effective masses 28% heavier than the bare band masses. These findings allow us to rationalize previous experimental observations and provide a key to understanding carrier dynamics in halide perovskites.
- Affiliations
Citations
Schlipf, M., Poncé, S., & Giustino, F. (2018). Carrier Lifetimes and Polaronic Mass Enhancement in the Hybrid Halide Perovskite CH3NH3PbI3 from Multiphonon Fröhlich Coupling. Physical Review Letters, 121(8), 86402. https://doi.org/10.1103/physrevlett.121.086402 (Original work published 2018)