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Using the inelastic x-ray scattering (IXS) technique, we investigate the lattice dynamics of
inorganic–organic hybrid iodide perovskites FAPbI3 and FASnI3 (FA ≡ CH(NH2)2, formamidinium)
in their cubic α phase and tetragonal β phase. We find that the IXS spectra of FASnI3 are highly
broad at all momentum points, as has been widely observed in the Pb-based halide perovskites. The speeds of sound (phonon group velocities) and absolute values of elastic constants of FASnI3 are smaller than those of FAPbI3 in both phases. In addition, no significant difference in the phonon lifetimes of FAPbI3 and FASnI3 is observed. These results correlate better with the reported ten-dency that the lattice thermal conductivity of ASnX3 is lower than that of APbX3. We discuss that our results also favor the up-conversion mechanism by acoustic phonons in the phonon bottleneck effect for the long lifetime of hot carriers.

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• In Copyright
  ©2024 American Physical Society

Keyword: CH(NH2)2PbI3, CH(NH2)2SnI3, inelastic x-ray scattering, phonon

Date published: 2024-07-01

Publisher: American Physical Society (APS)

Journal:

• Physical Review B (ISSN: 24699969) vol. 110 issue. 2 024301

Funding:

• Ministry of Education, Culture, Sports, Science and Technology JPMXP0112101001
• Japan Society for the Promotion of Science 21K04646

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4650

First published URL: https://doi.org/10.1103/physrevb.110.024301

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Updated at: 2024-08-10 08:30:26 +0900

Published on MDR: 2024-08-10 08:30:26 +0900