Room Temperature Thermoelectric Properties of Isostructural Selenides Ta2PdS6 and Ta2PdSe6

TL;DR

This study measures the thermoelectric properties of isostructural Ta2PdS6 and Ta2PdSe6 at room temperature, highlighting Ta2PdSe6's high power factor and potential for thermoelectric applications.

Contribution

It provides the first detailed thermoelectric characterization of Ta2PdX6 (X=S, Se) single crystals near room temperature, identifying Ta2PdSe6 as a promising thermoelectric material.

Findings

Ta2PdSe6 exhibits the highest power factor among studied materials.

Ta2PdS6 could be a candidate for Peltier cooling after reducing thermal conductivity.

Both materials show relatively high power factors at room temperature.

Abstract

We have measured thermoelectric properties of Ta2PdX6 (X=S, Se) around room temperature using single crystal samples. We find that the power factor of Ta2PdX6 is relatively high from middle-low to room temperatures, and notably Ta2PdSe6 shows the largest power factor among thermoelectric materials with an electrical conductivity of 10-2 {\Omega}cm at 300 K. Ta2PdS6 will be a possible candidate for a Peltier cooling material if the lattice thermal conductivity is reduced by chemical substitution.