Occupied Outer Cationic Orbitals in Dimeric MX₂-Type BaSe₂ Compound Lead to Reduced Thermal Conductivity and High Thermoelectric Performance

Abstract

Decoupling electrical and thermal properties to enhance the figure of merit of thermoelectric materials underscores an in-depth understanding of the mechanisms that govern the transfer of charge carriers. Typically, a factor that contributes to the optimization of thermal conductivity is often found to be detrimental to the electrical transport properties. Here, we systematically investigated 26 dimeric MX₂-type compounds (where M represents a metal and X represents a nonmetal element) to explore the influence of the electronic configurations of metal cations on lattice thermal transport and thermoelectric performance using first-principles calculations. A principled scheme has been identified that the filled outer orbitals of the cation lead to a significantly lower lattice thermal conductivity compared to that of the partly occupied case for MX₂, due to the much weakened bonds manifested by the shallow potential well, smaller interatomic force constants, and higher atomic displacement parameters. Based on these findings, we propose two ionic compounds, BaAs and BaSe₂, to realize reasonable high electrical conductivities through the structural anisotropy caused by the inserted covalent X₂ dimers while still maintaining the large lattice anharmonicity. The combined superior electrical and thermal properties of BaSe₂ lead to a high n-type thermoelectric ZT value of 2.3 at 500 K. This work clarifies the structural origin of the heat transport properties of dimeric MX₂-type compounds and provides an insightful strategy for developing promising thermoelectric materials.

Keywords

anisotropic electrical and thermal transport / density functional theory / dimeric MX ₂-type compounds / energy materials / ionic compound BaSe ₂ and BaAs / simulation / thermoelectrics

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2024 The Author(s). Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.