Optical Properties and Band gap tuning by co-doping of Sb in Fe doped SnTe bulk alloys

Abstract

SnTe is being widely used as a thermoelectric material after bringing about improvement in its performance due to doping. In this study, SnTe bulk alloys are prepared by doping Fe (0.05) and then co-doping with Sb. XRD pattern confirms single phase formation. There is no presence of any additional impurity peaks. We observe unusual variations in the band gap values. The FTIR spectra also revealed shifting in the vibration modes of SnTe due to the effects of dopant materials. Raman studies have shown splitting of characteristic peaks with the introduction of Sb into Fe SnTe matrix.