Impact of Substrate Temperature on Vibrational and Chemical Properties of Cu2ZnSn0.6Ge0.4S Thin Films

Abstract

In this work, an attempt was made to obtain thin films of Cu2ZnSn0.6Ge0.4S by spray-pyrolysis method with different substrate temperatures (T = 325–425 °C). The micro-Raman spectroscopy, SEM and EDS methods were used to study the impact of substrate temperature on the films growth. SEM analysis showed that the increase in temperature leads to degradation of the sample surface. This process is accompanied by a decrease of the sulfur concentration. Micro-Raman analysis showed the presence of two phases in thin films simultaneously, CZTS and CZTGeS. This indicates an incomplete substitution of Sn-Ge throughout the volume of the film. The change of the deposition temperature affects only for the peaks intensity from phonon modes on the spectra.