“…Sn-Sb-S systems are members of the IV-VI group of semiconductors which attracted some attention because of their interesting properties [2], and their potential applications in many technological fields such as: thermoelectric energy conversion application [4], phase change memory devices [3,5], X-rays detectors [3], and thin film solar cells [3,6]. SnSb 4 S 7 ternary semiconducting material is one of the most promising semiconductor materials which can be used in solar energy conversion and its high absorption coefficients [7]. As well known from the literature, any work providing a detailed explanation of the optical parameters of SnSb 4 S 7 thin films deposited by vacuum evaporation method has been reported so far.…”