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

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 BiAgSeS0.97Cl0.03, indicating that the BiAgSeS system is promising for thermoelectric power generation applications.