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Temperature-Dependent Evolution of Raman Spectra of Methylammonium Lead Halide Perovskites, CH₃NH₃PbX₃ (X = I, Br).

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 cm-1 for MAPbBr₃ and at ~240 cm-1 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.

SUBMITTER: Nakada K 

PROVIDER: S-EPMC6384565 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature

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Temperature-Dependent Evolution of Raman Spectra of Methylammonium Lead Halide Perovskites, CH₃NH₃PbX₃ (X = I, Br).

Nakada Kousuke K   Matsumoto Yuki Y   Shimoi Yukihiro Y   Yamada Koji K   Furukawa Yukio Y  

Molecules (Basel, Switzerland) 20190211 3

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 cm<sup>-1</sup> for MAPbBr₃ and at ~240 cm<sup>-1</sup> for MAPbI₃ were assigned to the MA⁻PbX₃ cage vibrati  ...[more]

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