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Dual Crystal-Liquid Thermal Transport Behavior in MAPbCl3
Jia-Kai Hu1, Yu-Ju Lee1, Cheng-Chieh Wu1
1Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 70101, Taiwan.
Small (Weinheim an Der Bergstrasse, Germany)
|December 4, 2024
Summary
This study reveals that methylammonium lead chloride (MAPbCl3) exhibits ultralow thermal conductivity due to low phonon velocities and short lifetimes. Its thermal transport transitions from crystal-like to liquid-like during phase changes.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid-State Chemistry
Background:
- Organic-inorganic hybrid perovskites (OIHPs) display complex phonon dynamics.
- Interactions between organic cations and inorganic octahedra, mediated by hydrogen bonding, drive this complexity.
Purpose of the Study:
- Investigate the thermal transport behavior of methylammonium lead chloride (MAPbCl3) as a representative OIHPs.
- Elucidate the mechanisms behind the ultralow thermal conductivity in OIHPs.
Main Methods:
- Analysis of phonon dynamics and thermal conductivity in MAPbCl3.
- Temperature-dependent studies across different crystalline phases.
Main Results:
- MAPbCl3 exhibits ultralow thermal conductivity, approaching the amorphous limit.
- Thermal conductivity is governed by low phonon velocities, short lifetimes, and mean free paths near the Regel-Ioffe limit.
- A transition from crystal-like to liquid-like thermal transport occurs during phase transitions.
Conclusions:
- Phonon scattering mechanisms vary with phase transitions in MAPbCl3.
- Dynamic lattice distortions from MA+ cation rotation significantly impact thermal transport in the cubic phase.
