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Which bismuth compounds are used in thermoelectric refrigeration devices?

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A labeled periodic table element box for bismuth shows atomic number 83, symbol Bi, atomic weight 208.9804, electron configuration, and properties including solid state, rhombohedral crystal structure, and weakly acidic oxides. — bismuth Properties of bismuth.

Thermoelectric refrigeration devices utilize the bismuth compounds bismuth telluride ( ${Bi}_{2} {Te}_{3}$ ) and bismuth selenide ( ${Bi}_{2} {Se}_{3}$ ). Bismuth telluride, in particular, is recognized as one of the most effective bulk thermoelectric materials available for such applications.12