Abstract
The recent re‐emergence of halide perovskites has received escalating interest for optoelectronic applications. In addition to photovoltaics, the multifunctional nature of halide perovskites has led to diverse applications. The ultralow thermal conductivity coupled with decent mobility and charge carrier tunability led to the prediction of halide perovskites as a possible contender for future thermoelectrics. Herein, recent advances in thermal transport of halide perovskites and their potentials and challenges for thermoelectrics are reviewed. An overview of the phonon behavior in halide perovskites, as well as the compositional dependency is analyzed. Understanding thermal transport and knowing the thermal conductivity value is crucial for creating effective heat dissipation schemes and determining other thermal‐related properties like thermo‐optic coefficients, hot‐carrier cooling, and thermoelectric efficiency. Recent works on halide perovskite‐based thermoelectrics together with theoretical predictions for their future viability are highlighted. Also, progress on modulating halide perovskite‐based thermoelectric properties using light and chemical doping is discussed. Finally, strategies to overcome the limiting factors in halide perovskite thermoelectrics and their prospects are emphasized.
Highlights
The ultralow thermal conductivity coupled with decent mobility and charge carrier tunability led to the prediction of halide perovskites as a possible contender for future thermoelectrics
We highlighted the recent progress on thermal transport and phonon behaviors in halide perovskites as well as its nascent thermoelectric research
Their inherent ultralow κ and high Seebeck coefficient at room temperature are promising, but their low electrical conductivity has hindered the progress of halide perovskite thermoelectrics
Summary
The thermal transport behavior of materials is generally quantified by the thermal conductivity (κ) parameter which, in turn, is governed by the Fourier’s law. There are a number of experimental techniques available to determine the total κ of a material such as the laser flash method,[47] steady-state method,[48] time-domain or frequency-domain thermoreflectance,[49] 3ω method,[50] and so forth Details of these individual methods can be found in the cited references as well as in other excellent reviews on thermal conductivity measurement techniques.[51] On the other hand, κ can be estimated theoretically. Where S, σ, κ, and T are the Seebeck coefficient, electrical conductivity, thermal conductivity, and absolute temperature, respectively.[44] For a high-performance thermoelectric material (i.e., high ZT), it is imperative to have a high electrical conductivity, low thermal conductivity, and large Seebeck coefficient concurrently The interdependency of these various parameters in ZT makes the material selection and optimization challenging
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