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The correlated couple of electrical and thermal property is the challenge torealize a substantial leap in thermoelectric materials.Synthesis ofsemiconductor and metal composites is a significant and versatile designstrategy to optimize the thermoelectric performance driven by tailoredinterface between nanoinclusions and matrix.In this study, we present thesimultaneous increase of electrical conductivity and Seebeck coefficient, andreduction of thermal conductivity in Sb2Te3-Au system.The enhanced electricalconductivity lies in the incorporated Au nanostructures contributing toinjecting carriers to Sb2Te3 matrix.The appropriate barriers originated fromthe Au-Sb2Te3 interface, which filter low energy carriers, results inenhancement of Seebeck coefficient.The increased boundaries and nanodomainsblock the transport of phonons, subsequently reducing the thermalconductivity.As a consequence, combination of these effects promote double ofZT value in 1% Au@ Sb2Te3 composites with respect to the pristine Sb2Te3.

High Thermoelectric Performance of Au@Sb2Te3 Heterostructure Derived from the Potential Barriers