Phonon, thermal, and thermo-optical properties of halide perovskites

Metal halide perovskites are semiconductors with many fascinating characteristics and their widespread use in optoelectronic devices has been expected. High-quality thin films and single crystals can be fabricated by simple chemical solution processes and their fundamental electrical, optical, and t...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2020-11, Vol.22 (45), p.2669-2687
Main Authors: Handa, Taketo, Yamada, Takumi, Nagai, Masaya, Kanemitsu, Yoshihiko
Format: Article
Language:English
Subjects:
Material properties
Metal halides
Optical properties
Optoelectronic devices
Perovskites
Phonons
Single crystals
Thermal energy
Thermal expansion
Thermodynamic properties
Thin films
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Summary:Metal halide perovskites are semiconductors with many fascinating characteristics and their widespread use in optoelectronic devices has been expected. High-quality thin films and single crystals can be fabricated by simple chemical solution processes and their fundamental electrical, optical, and thermal properties can be changed significantly by compositional substitution, in particular halogen ions. In this perspective, we provide an overview of phonon and thermal properties of metal halide perovskites, which play a decisive role in determining device performance. After a brief introduction to fundamental material properties, longitudinal-optical phonons and unusual thermal properties of metal halide perovskites are discussed. Remarkably, they possess very low thermal conductivities and very large thermal expansion coefficients despite their crystalline nature. In line with these discussions, we present optical properties governed by the strong electron-phonon interactions and the unusual thermal properties. By showing their unique thermo-optic responses and novel application examples, we highlight some aspects of the unusual thermal properties. Halide perovskites possess unusual phonon and thermal properties, which lead to unique thermo-optical responses very different from those of conventional inorganic semiconductors.
ISSN:1463-9076
1463-9084
DOI:10.1039/d0cp04426a