Bi2Te0.45Se2.55

Bi₂Te₀.₄₅Se₂.₅₅ is a bismuth telluride–selenide solid solution, a p-type semiconductor belonging to the tetradymite family of thermoelectric materials. This composition represents an optimization within the Bi–Te–Se ternary system, where partial substitution of tellurium with selenium is engineered to enhance thermoelectric performance at mid-range temperatures (typically 300–500 K). The material is primarily investigated for direct thermal-to-electrical energy conversion and is used or under development in thermoelectric generators, waste heat recovery systems, and precision cooling modules where its figure of merit (ZT) and temperature stability offer advantages over unary bismuth telluride.