Title :
Optimization of (Bi,Sb)2(Te,Se)3-based thermoelectrics for low-temperature applications
Author :
Vedernikov, M.V. ; Kutasov, V.A. ; Luk´yanova, L.N. ; Konstantinov, P.P.
Author_Institution :
A.F. Ioffe Physicotech. Inst., Acad. of Sci., St. Petersburg, Russia
Abstract :
General situation with thermoelectric cooling at temperatures below 200 K is discussed. The problem of optimization of (Bi,Sb)2 (Te,Se)3-based thermoelectrics for operation in this temperature range is distinguished as the actual one especially in connection with a possible practical application of high-temperature superconductors. Then detailed results of the first systematic study of n-type Bi2Te3-x-ySexSy and p-type Bi2-xSbxTe3-ySey are presented. The composition of solid solutions and the current carrier concentration were optimized. Thermopower, electrical and thermal conductivity were measured at 80-350 K, and thermoelectric figure of merit was calculated. Figure of merit for both type materials was increased significantly for the temperatures near 100-150 K. These optimized materials were used for the fabrication of the special low-temperature thermoelectric modules. These modules were tested, and temperature 130 K and 124 K on the cold junction of 2 types of 6-stages coolers was achieved
Keywords :
antimony compounds; bismuth compounds; carrier density; semiconductor materials; thermal conductivity; thermoelectric power; (Bi,Sb)2(Te,Se)3-based thermoelectrics; (BiSb)2(TeSe)3; 100 to 150 K; 80 to 350 K; current carrier concentration; electrical conductivity; low-temperature applications; thermal conductivity; thermoelectric cooling; thermopower; Bismuth; Conducting materials; Conductivity measurement; Cooling; High temperature superconductors; Solids; Tellurium; Temperature distribution; Thermal conductivity; Thermoelectricity;
Conference_Titel :
Thermoelectrics, 1997. Proceedings ICT '97. XVI International Conference on
Conference_Location :
Dresden
Print_ISBN :
0-7803-4057-4
DOI :
10.1109/ICT.1997.666974
