Effect of Bi Substitution on Thermoelectric Properties of SbSe2-based Layered Compounds NdO${}_{0.8}$F${}_{0.2}$Sb${}_{1-x}$Bi${}_x$Se${}_2$

Abstract

Although SbSe2-based layered compounds have been predicted to be high-performance thermoelectric materials and topological materials, most of these compounds obtained experimentally have been insulators so far. Here, we present the effect of Bi substitution on the thermoelectric properties of SbSe2-based layered compounds NdO0.8F0.2Sb1-xBixSe2 (x = 0-0.4). The room temperature electrical resistivity is decreased to 8.0 * 10^-5 ohmm for x = 0.4. The electrical power factor is calculated to be 1.4 * 10^-4 W/mK^2 at 660 K, which is in reasonable agreement with combined Jonker and Ioffe analysis. The room-temperature lattice thermal conductivity of less than 1 W/mK is almost independent of x, in contrast to the point-defect scattering model for conventional alloys. The present work provides an avenue for exploring SbSe2-based insulating and BiSe2-based conducting systems.

arXiv comment19 pages, 8 figures, 1 table. arXiv admin note: text overlap with arXiv:1805.07850

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Cited by in corpus (4)

• First-principles study of LaOPbBiS${}_3$ and its analogous compounds as thermoelectric materials
• First-principles study of defect formation energies in LaO$X$S${}_2$ ($X=$ Sb, Bi)
• Pressure-induced superconductivity in layered pnictogen diselenide NdO${}_{0.8}$F${}_{0.2}$Sb${}_{1-x}$Bi${}_x$Se${}_2$ (x = 0.3 and 0.7)
• Crystal Structure and Thermoelectric Transport Properties of As-Doped Layered Pnictogen Oxyselenides NdO0.8F0.2Sb1-xAsxSe2