Bi2Te0.4Se2.6

Bi₂Te₀.₄Se₂.₆ is a bismuth telluride-selenide solid solution, a narrow-bandgap semiconductor belonging to the V-VI compound family used primarily in thermoelectric applications. This material is engineered to optimize the Seebeck coefficient and thermal conductivity balance for intermediate-temperature thermoelectric devices, offering tunable performance between binary BiTe and BiSe end members. It is typically employed in research and specialized thermoelectric generators and coolers operating in the 300–500 K range, where its bandgap and carrier concentration can be optimized through composition control.