Anisotropy of thermal diffusivity in lead halide perovskite layers revealed by thermal grating technique

P. Ščajev, R. Aleksieju Nas, S. Terakawa, C. Qin, T. Fujihara, T. Matsushima, C. Adachi, S. Juršenas

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Heat management of optoelectronic devices is of critical significance in lead halide perovskites due to the intrinsically low thermal conductivity of this material. Despite its importance, thermal conductivity remains understudied, particularly in polycrystalline perovskite layers with different halides. Here, we employ a novel method for investigation of thermal properties in perovskite layers, which is based on a light-induced transient diffraction grating technique. We demonstrate the applicability of thermal grating technique by determining in an all-optical way the thermo-optic coefficient, speed of sound, and thermal conductivity in vapor-deposited polycrystalline layers of MAPbX3 (X = Cl, Br, I), MAPbBr2I, and MAPbCl2Br perovskites. We reveal the spatial anisotropy of thermal conductivity, which is noticeably lower in the direction along the layer surface (0.2-0.5 W/(m K)) if compared to that across the layer (0.3-1.1 W/(m K)). Finally, we demonstrate that for both directions the thermal conductivity scales linearly with the average speed of sound in the perovskite layers.

元の言語英語
ページ(範囲)14914-14920
ページ数7
ジャーナルJournal of Physical Chemistry C
123
発行部数24
DOI
出版物ステータス出版済み - 6 20 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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