Temperature-dependent evolution of Raman spectra of methylammonium lead halide perovskites, CH 3 NH 3 PbX 3 (X = I, Br)

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

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    14 Citations (Scopus)


    We present a Raman study on the phase transitions of organic/inorganic hybrid perovskite materials, CH 3 NH 3 PbX 3 (X = I, Br), which are used as solar cells with high power conversion efficiency. The temperature dependence of the Raman bands of CH 3 NH 3 PbX 3 (X = I, Br) was measured in the temperature ranges of 290 to 100 K for CH 3 NH 3 PbBr 3 and 340 to 110 K for CH 3 NH 3 PbI 3 . Broad ν 1 bands at ~326 cm 1 for MAPbBr 3 and at ~240 cm 1 for MAPbI 3 were assigned to the MA–PbX 3 cage vibrations. These bands exhibited anomalous temperature dependence, which was attributable to motional narrowing originating from fast changes between the orientational states of CH 3 NH 3 + 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 NH 3 + group.

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


    • 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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