Temperature-dependent evolution of Raman spectra of methylammonium lead halide perovskites, CH3NH3PbX3 (X = I, Br)

Kousuke Nakada, Yuki Matsumoto, Yukihiro Shimoi, Koji Yamada, Yukio Furukawa

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29 Citations (Scopus)

Abstract

We present a Raman study on the phase transitions of organic/inorganic hybrid perovskite materials, CH3NH3PbX3 (X = I, Br), which are used as solar cells with high power conversion efficiency. The temperature dependence of the Raman bands of CH3NH3PbX3 (X = I, Br) was measured in the temperature ranges of 290 to 100 K for CH3NH3PbBr3 and 340 to 110 K for CH3NH3PbI3. Broad ν1 bands at ~326 cm1 for MAPbBr3 and at ~240 cm1 for MAPbI3 were assigned to the MA–PbX3 cage vibrations. These bands exhibited anomalous temperature dependence, which was attributable to motional narrowing originating from fast changes between the orientational states of CH3NH3+ in the cage. Phase transitions were characterized by changes in the bandwidths and peak positions of the MA–cage vibration and some bands associated with the NH3+ group.

Original languageEnglish
Article number626
JournalMolecules
Volume24
Issue number3
DOIs
Publication statusPublished - 2019 Feb 11

Keywords

  • Bandwidth
  • Methylammonium lead halide perovskites
  • Motional narrowing
  • Organic/inorganic hybrid perovskites
  • Phase transition
  • Raman spectroscopy

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemistry (miscellaneous)
  • Molecular Medicine
  • Pharmaceutical Science
  • Drug Discovery
  • Physical and Theoretical Chemistry
  • Organic Chemistry

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