Ultrafast THz Probe of Photoinduced Polarons in Lead-Halide Perovskites

Research output: Contribution to journalArticle

Abstract

We study the nature of photoexcited charge carriers in CsPbBr3 nanocrystal thin films by ultrafast optical pump-THz probe spectroscopy. We observe a deviation from a pure Drude dispersion of the THz dielectric response that is ascribed to the polaronic nature of carriers; a transient blueshift of observed phonon frequencies is indicative of the coupling between photogenerated charges and stretching-bending modes of the deformed inorganic sublattice, as confirmed by DFT calculations.

Details

Authors
  • Eugenio Cinquanta
  • Daniele Meggiolaro
  • Silvia G. Motti
  • Marina Gandini
  • Marcelo J.P. Alcocer
  • Quinten A. Akkerman
  • Caterina Vozzi
  • Liberato Manna
  • Filippo De Angelis
  • Annamaria Petrozza
  • Salvatore Stagira
Organisations
External organisations
  • Polytechnic University of Milan
  • CNR Institute for Photonics and Nanotechnologies, Rome (IFN)
  • Italian Institute of Technology
  • University of Genoa
  • University of Perugia
  • CNR Institute of Molecular Science and Technologies (ISTM-CNR)
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Condensed Matter Physics
Original languageEnglish
Article number166601
JournalPhysical Review Letters
Volume122
Issue number16
Publication statusPublished - 2019
Publication categoryResearch
Peer-reviewedYes