Elastic Softness of Hybrid Lead Halide Perovskites

A. C. Ferreira; A. Létoublon; S. Paofai; S. Raymond; C. Ecolivet; B. Rufflé; S. Cordier; C. Katan; M. I. Saidaminov; A. A. Zhumekenov; O. M. Bakr; J. Even; P. Bourges

doi:10.1103/PhysRevLett.121.085502

Elastic Softness of Hybrid Lead Halide Perovskites

A. C. Ferreira, A. Létoublon, S. Paofai, S. Raymond, C. Ecolivet, B. Rufflé, S. Cordier, C. Katan, M. I. Saidaminov, A. A. Zhumekenov, O. M. Bakr, J. Even, P. Bourges

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Abstract

Much recent attention has been devoted towards unraveling the microscopic optoelectronic properties of hybrid organic-inorganic perovskites. Here we investigate by coherent inelastic neutron scattering spectroscopy and Brillouin light scattering, low frequency acoustic phonons in four different hybrid perovskite single crystals: MAPbBr3, FAPbBr3, MAPbI3, and α-FAPbI3 (MA: methylammonium, FA: formamidinium). We report a complete set of elastic constants characterized by a very soft shear modulus C44. Further, a tendency towards an incipient ferroelastic transition is observed in FAPbBr3. We observe a systematic lower sound group velocity in the technologically important iodide-based compounds compared to the bromide-based ones. The findings suggest that low thermal conductivity and hot phonon bottleneck phenomena are expected to be enhanced by low elastic stiffness, particularly in the case of the ultrasoft α-FAPbI3.

Original language	English (US)
Article number	085502
Journal	Physical Review Letters
Volume	121
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.121.085502
State	Published - Aug 22 2018

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General Physics and Astronomy

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title = "Elastic Softness of Hybrid Lead Halide Perovskites",

abstract = "Much recent attention has been devoted towards unraveling the microscopic optoelectronic properties of hybrid organic-inorganic perovskites. Here we investigate by coherent inelastic neutron scattering spectroscopy and Brillouin light scattering, low frequency acoustic phonons in four different hybrid perovskite single crystals: MAPbBr3, FAPbBr3, MAPbI3, and α-FAPbI3 (MA: methylammonium, FA: formamidinium). We report a complete set of elastic constants characterized by a very soft shear modulus C44. Further, a tendency towards an incipient ferroelastic transition is observed in FAPbBr3. We observe a systematic lower sound group velocity in the technologically important iodide-based compounds compared to the bromide-based ones. The findings suggest that low thermal conductivity and hot phonon bottleneck phenomena are expected to be enhanced by low elastic stiffness, particularly in the case of the ultrasoft α-FAPbI3.",

author = "Ferreira, {A. C.} and A. L{\'e}toublon and S. Paofai and S. Raymond and C. Ecolivet and B. Ruffl{\'e} and S. Cordier and C. Katan and Saidaminov, {M. I.} and Zhumekenov, {A. A.} and Bakr, {O. M.} and J. Even and P. Bourges",

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doi = "10.1103/PhysRevLett.121.085502",

language = "English (US)",

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T1 - Elastic Softness of Hybrid Lead Halide Perovskites

AU - Ferreira, A. C.

AU - Létoublon, A.

AU - Paofai, S.

AU - Raymond, S.

AU - Ecolivet, C.

AU - Rufflé, B.

AU - Cordier, S.

AU - Katan, C.

AU - Saidaminov, M. I.

AU - Zhumekenov, A. A.

AU - Bakr, O. M.

AU - Even, J.

AU - Bourges, P.

PY - 2018/8/22

Y1 - 2018/8/22

N2 - Much recent attention has been devoted towards unraveling the microscopic optoelectronic properties of hybrid organic-inorganic perovskites. Here we investigate by coherent inelastic neutron scattering spectroscopy and Brillouin light scattering, low frequency acoustic phonons in four different hybrid perovskite single crystals: MAPbBr3, FAPbBr3, MAPbI3, and α-FAPbI3 (MA: methylammonium, FA: formamidinium). We report a complete set of elastic constants characterized by a very soft shear modulus C44. Further, a tendency towards an incipient ferroelastic transition is observed in FAPbBr3. We observe a systematic lower sound group velocity in the technologically important iodide-based compounds compared to the bromide-based ones. The findings suggest that low thermal conductivity and hot phonon bottleneck phenomena are expected to be enhanced by low elastic stiffness, particularly in the case of the ultrasoft α-FAPbI3.

AB - Much recent attention has been devoted towards unraveling the microscopic optoelectronic properties of hybrid organic-inorganic perovskites. Here we investigate by coherent inelastic neutron scattering spectroscopy and Brillouin light scattering, low frequency acoustic phonons in four different hybrid perovskite single crystals: MAPbBr3, FAPbBr3, MAPbI3, and α-FAPbI3 (MA: methylammonium, FA: formamidinium). We report a complete set of elastic constants characterized by a very soft shear modulus C44. Further, a tendency towards an incipient ferroelastic transition is observed in FAPbBr3. We observe a systematic lower sound group velocity in the technologically important iodide-based compounds compared to the bromide-based ones. The findings suggest that low thermal conductivity and hot phonon bottleneck phenomena are expected to be enhanced by low elastic stiffness, particularly in the case of the ultrasoft α-FAPbI3.

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JO - Physical Review Letters

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Elastic Softness of Hybrid Lead Halide Perovskites

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