High thermoelectric performance in n-type BiAgSeS due to intrinsically low thermal conductivity

Abstract

BiAgSeS shows intrinsically low thermal conductivity in the temperature range from 300 K (∼0.46 W m⁻¹ K⁻¹) to 823 K (∼0.29 W m⁻¹ K⁻¹). Low thermal conductivity coupling with enhanced electrical transport properties achieved through partially substituting S²⁻ by Cl⁻ leads to a high ZT of ∼1.0 at 823 K for BiAgSeS_0.97Cl_0.03, indicating that the BiAgSeS system is promising for thermoelectric power generation applications.