Ultrafast acoustic phonon scattering in CH3NH3PbI3 revealed by femtosecond four-wave mixing
Abstract
Carrier scattering processes are studied in CH3NH3PbI3 using temperature-dependent four-wave mixing experiments. Our results indicate that scattering by ionized impurities limits the interband dephasing time (T2) below 30 K, with strong electron-phonon scattering dominating at higher temperatures (with a time scale of 125 fs at 100 K). Our theoretical simulations provide quantitative agreement with the measured carrier scattering rate and show that the rate of acoustic phonon scattering is enhanced by strong spin-orbit coupling, which modifies the band-edge density of states. The Rashba coefficient extracted from fitting the experimental results (γc = 2 eV Å) is in agreement with calculations of the surface Rashba effect and recent experiments using the photogalvanic effect on thin films.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 08, 2019
- Source ID
- 10.1063/1.5120385
Entities
People
- Charlotte Clegg
- Daniel Webber
- Drew B. Riley
- Ian G. Hill
- Kimberley C Hall
- Samuel A. March
- Zhi-Gang
Organizations
- Army Research Office
- Dalhousie University
- Natural Sciences and Engineering Research Council
- Washington State University