| Title |
Pesearch Paper / Electronic , Magnetic & Optical Matrials : Thermoelectric Properties of the Hot - pressed n - Type (Bi2Te3)0.9(Sb2Te3)0.05(Sb2Se3)0.05 with Addition of SbI3 and Excess Te |
| Authors |
이준수(Jun Soo Lee),오태성(Tae Sung Oh),현도빈(Dow Bin Hyun),황창원(Chang Won Hwang) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Abstract |
Thermoelectric properties of the n-type (Bi₂Te₃)_(0.9)(Sb₂Te₃)_(0.05)(Sb₂Se₃)_(0.05) alloy prepared by melting/grinding and hot pressing, were investigated with variation of the doping amount of SbI₃and excess Te. With increasing the doping amount of SbI₃ and excess Te, the Seebeck coefficient and electrical resistivity of the hot-pressed (Bi₂Te₃)_(0.9)(Sb₂Te₃)_(0.05)(Sb₂Te₃)_(0.05) alloy were lowered due to the increase in the electron concentration. When SbI₃ and excess Te were doped within 0.1 wt%, SbI₃ exhibited doping effect, i.e., increase in the electron concentration, 2.8 times larger than that of excess Te. The hot-pressed (Bi₂Te3)_(0.9)(Sb₂Te3)_(0.05)(Sb₂Se₃)_(0.05) alloy exhibited maximum figure-of-merits of 2.02×10^(-3)/K and 2.22×10^(-3)/K with doping of 0.025 wt% SbI₃ and 0.2 wt% excess Te, respectively. |