Doping with organic halogen-containing compounds: the Bi2Te3-Bi2Se3 solid solutions

Presently, Bi₂(Te,Se)₃ solid solutions used as an n-type legs for thermoelectric devices, are doped with inorganic halogen-containing compounds. However, most of these compounds are liable to dissociation when exposed to light, they are hygroscopic and tend to electrisation when poured from one place to another. These factors often give rise to wrong dosing of dopants in conditions of commercial production. This paper describes opportunities for doping of Bi₂(Te,Se)₃ solid solutions with organic halogen-containing compounds. For practical application it is proposed to use hexachlorethane (C₂Cl₆), hexachlorbenzol (C₆Cl₆), dibrombenzol (C₆H₄Br₂) hexabrombenzol (C₆Br₆) and iodoform (CHI₃). The advantages of the latter are shown as compared to inorganic halogen-containing compounds.