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Article Dans Une Revue ACS Energy Letters Année : 2023

Origin of Phase Transitions in Inorganic Lead Halide Perovskites: Interplay between Harmonic and Anharmonic Vibrations

Zhi-Gang Li
  • Fonction : Auteur
Ying Zhang
  • Fonction : Auteur
Fengxia Wei
Yan Qin
  • Fonction : Auteur
Lian-Cai An
  • Fonction : Auteur
Fei-Fei Gao
  • Fonction : Auteur
Wei Li
Xian-He Bu

Résumé

Inorganic lead halide perovskites (ILHPs) exhibit a series of phase transitions, and stabilization of the phases with desirable optoelectronic properties remains a major challenge. However, the intrinsic origins of structural instabilities in CsPbX3 (X = Br, I) are still elusive. Herein, the important role of harmonic and anharmonic vibrations in influencing thermodynamic fluctuations of ILHPs was revealed, through combined lattice dynamics and multiphonon theory calculations, and verified by diffraction experiments. Our results demonstrate that the transition between δ- and γ-CsPbI3 is driven by harmonic vibrations, unveiling the mysterious mechanism for stabilizing γ-CsPbI3 via applying strain. Moreover, the successive transitions from the α- to β- and β- to γ-phases of CsPbX3 are driven by anharmonic vibrations. These structural dynamics are strongly coherent with the phonon diffuse scattering, substantially affecting the thermal conductivity and carrier relaxation. This work provides guidelines for maintaining favorable ILHP phases through delicately manipulating their lattice dynamics.
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Dates et versions

hal-04130843 , version 1 (21-06-2023)

Identifiants

Citer

Zhi-Gang Li, Marios Zacharias, Ying Zhang, Fengxia Wei, Yan Qin, et al.. Origin of Phase Transitions in Inorganic Lead Halide Perovskites: Interplay between Harmonic and Anharmonic Vibrations. ACS Energy Letters, 2023, 8 (7), pp.3016-3024. ⟨10.1021/acsenergylett.3c00881⟩. ⟨hal-04130843⟩
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