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Electronic and Lattice Thermal Conductivity Switching by 3D−2D Crystal Structure Transition in Nonequilibrium (Pb 1− x Sn x )Se

2022; Wiley; Volume: 8; Issue: 9 Linguagem: Inglês

10.1002/aelm.202200024

2199-160X

Yusaku Nishimura, Xinyi He, Takayoshi Katase, Terumasa Tadano, Keisuke Ide, Suguru Kitani, Kota Hanzawa, Shigenori Ueda, Hidenori Hiramatsu, Hitoshi Kawaji, Hideo Hosono, Toshio Kamiya,

Thermal Radiation and Cooling Technologies

Abstract Dynamic control of thermal transport in solid materials is highly desired for thermal management technology. However, the development of a material exhibiting large modulation of thermal conductivity (κ) by external stimuli remains a major challenge. Here, the large κ modulation is reported by the reversible 3D to 2D crystal structure transition in a nonequilibrium solid solution of (Pb 1− x Sn x )Se, where Pb 2+ stabilizes a 3D cubic structure while Sn 2+ does a 2D layered structure. The phase boundary of these phases is induced in (Pb 0.5 Sn 0.5 )Se bulk polycrystals by thermally quenching the high‐temperature solid solution phase. Through the 3D–2D phase transition, the 1/2.9‐times decrease of lattice κ (κ lat. ) is achieved by strong phonon scattering in the 2D layered structure, and the electronic κ (κ ele. ) is also decreased by 5 orders of magnitude due to the electronic phase transition from a 3D high conductivity state to a 2D semiconducting state. The total κ ( = κ lat. + κ ele. ) modulation ratio κ 3D phase /κ 2D phase = 3.6 is attained at 373 K. The present strategy will lead to a novel concept for designing thermal management materials through crystal‐structure dimensionality switch using nonequilibrium phase boundaries.