Optoelectronic Properties of CuSbS2 and Cu12Sb4S13 Thin Films for Thermoelectric Applications

Abstract

This work presents a two-step procedure to obtain thin films with a combination of CuSbS 2 and Cu 12 Sb 4 S 13 phases for study in thermoelectric applications. The procedure consisted of the physical evaporation of sulfides layers (Sb 2 S 3 and CuS) on glass substrates and the subsequent annealing of the samples in a N 2 atmosphere. The characterizations by Raman spectroscopy and XRD revealed that the samples presented a varied percentage of Cu 12 Sb 4 S 13 and CuSbS 2 . The results indicated that the percentage of phases depended on the initial thickness of the sulfide layers and the annealing temperature. The lower initial ratio between sulfide thicknesses and annealing temperature above 300 °C favored the formation of Cu 12 Sb 4 S 13 . However, the thermoelectric properties were improved when the phases coexisted in the thin film compared to samples with high percentages of Cu 12 Sb 4 S 13 . In this way, a sample with a power factor of 2.30 μW /cm• K 2 at 60 ºC was identified.