Thermal Transport Properties of Phonons in Halide Perovskites

Abstract

Halide perovskites have emerged as promising candidates for various applications, such as photovoltaic, optoelectronic and thermoelectric applications. The knowledge of the thermal transport of halide perovskites is essential for enhancing the device performance for these applications and improving the understanding of heat transport in complicated material systems with atomic disorders. In this work, the current understanding of the experimentally and theoretically obtained thermal transport properties of halide perovskites is reviewed. This study comprehensively examines the reported thermal conductivity of methylammonium lead iodide, which is a prototype material, and provides theoretical frameworks for its lattice vibrational properties. The frameworks and discussions are extended to other halide perovskites and derivative structures. The implications for device applications, such as solar cells and thermoelectrics, are discussed.

Anomalous Correlation between Thermal Conductivity and Elastic Modulus in Two-Dimensional Hybrid Metal Halide Perovskites

“…The cross-plane thermal conductivity is typically lower in the case of parallel orientation, owing to the weaker nonbonded interactions . This explains the lower thermal conductivity in our 2D HOIP thin films (∼0.1–0.25 W m –1 K –1 ), relative to the 3D HOIP thin films Figure c shows the measured coherent length (crystallite size) of six 2D HOIP thin films extracted from the (010) peak near 0.4 Å –1 .…”

“…Moreover, these studies have been confined to achiral organic cations, limiting the scope for tuning interactions at organic–organic interfaces. This limitation, particularly in the choice of organic ligands, restricts the bandwidth available for modulating the organic–organic interface. , Similarly, studies on elastic modulus primarily focus on pure alkyl–alkyl and aryl–aryl type interfaces. ,− While there is a consensus that the stiffness of the organic cation and the organic–organic interaction play crucial roles in determining the elastic modulus in 2D HOIPs, minimal effort has been dedicated to tuning the latter . To advance our understanding and possibly decouple the thermal and mechanical behavior, there is a need for more comprehensive investigations that delve into the nuanced dynamics of organic–organic interfaces, exploring a broader range of organic cations and interfaces.…”

Enhanced Hot‐Phonon Bottleneck Effect on Slowing Hot Carrier Cooling in Metal Halide Perovskite Quantum Dots with Alloyed A‐Site

“…This is related to the low thermal conductivity of perovskite materials arising from strong anharmonic phonon-phonon scattering. [44] Apart from CsPbI 3 QDs, all organic cation-containing PQDs exhibited very similar phonon band dispersions, which could not fully explain the longer second-stage HC cooling lifetime of the alloyed PQDs at moderate excitation intensities (discussed above). Considering that the smaller DOS of the phonon modes was favorable for slowing down HC cooling, [12b] we focused on comparing the DOS of the phonon modes for all PQDs.…”

Accelerating Thermal Transfer in Perovskite Films for High‐Efficiency and Stable Photovoltaics

“…[21] In general, the thermal transport properties of perovskite films are reflected by the lattice vibration and the electron movement; that is, the structural disorder and sluggish carrier transport dynamics within perovskite film will deliver ultralow thermal conductivity. [22,23] Taken them together, it is obvious that the careful control on perovskite film properties will expectedly display unique advantages in determining the final cell temperature, synchronously accompanying the efficiency and durability improvement. By reviewing the reported strategies so far, [24][25][26] only a few studies have tentatively incorporated inorganic nanoparticles with high thermal conductivity, such as aluminum oxide (Al 2 O 3 ), silicon dioxide (SiO 2 ) and hexagonal boron nitride (h-BN), into the hole-transporting materials or perovskite films to accelerate heat transfer, demonstrating great potential in improving the efficiency and stability of PSCs.…”