Generation of Coherent Optical Phonons in Methylammonium Lead Iodide Thin Films

Chengbin Fei, Julio S. Sarmiento, He Wang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A long-lived hot carrier in organic-inorganic hybrid perovskite materials is possibly assisted by the large polaron and hot phonon bottleneck. The phonon plays a significant role in the properties of hybrid perovskites. Coherent phonon refers to the in-phase vibration of the crystal lattice. Here, temperature-dependent, fluence-dependent, and polarization-dependent transient absorption spectroscopy is utilized to study the coherent phonon in methylammonium lead iodide. A coherent optical phonon is observed due to the existence of Pb-I-Pb angular distortion at 24-33 cm-1 in both tetragonal and orthorhombic phases. Oscillation from the excited-state absorption is also observed, suggesting coupling between the coherent phonon and photoexcited state. Oscillation of the coherent phonon attenuates with increasing environmental temperature. The dependence of the coherent phonon on polarization of the pulse and quantitative analysis indicates that the generation mechanism is impulsive stimulated Raman scattering and transient depletion field screening.

Original languageEnglish (US)
Pages (from-to)17035-17041
Number of pages7
JournalJournal of Physical Chemistry C
Volume122
Issue number30
DOIs
StatePublished - Aug 2 2018

Fingerprint

Iodides
Phonons
iodides
phonons
Lead
Polarization
Stimulated Raman scattering
Gene Conversion
Thin films
oscillations
Hot carriers
polarization
perovskites
thin films
Absorption spectroscopy
Excited states
crystal lattices
Crystal lattices
Perovskite
quantitative analysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Generation of Coherent Optical Phonons in Methylammonium Lead Iodide Thin Films. / Fei, Chengbin; Sarmiento, Julio S.; Wang, He.

In: Journal of Physical Chemistry C, Vol. 122, No. 30, 02.08.2018, p. 17035-17041.

Research output: Contribution to journalArticle

Fei, Chengbin ; Sarmiento, Julio S. ; Wang, He. / Generation of Coherent Optical Phonons in Methylammonium Lead Iodide Thin Films. In: Journal of Physical Chemistry C. 2018 ; Vol. 122, No. 30. pp. 17035-17041.
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