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Vol.38, No.1, 153 ~ 159, 2000

Title

Pesearch Paper / Electronic , Magnetic & Optical Matrials : Effects of the Sb2Se3 Addition on the Electrical and Thermoelectric Properties of the 2 wt % excess Te - doped 25 % Bi2Te3 - 75 % Sb2Te3 Single Crystals

현도빈Dow Bin Hyun,하헌필Heon Phil Ha,황종승Jong Seung Hwang,오태성Tae Sung Oh

Abstract

Electrical and thermoelectric properties of the 2 wt% excess Te-doped (25% Bi₂Te₃-75% Sb₂Te₃)_(1-X) (Sb₂Se₃)_X single crystals have been investigated at temperatures ranging from 77K to 600K. With increasing the Sb₂Se₃ content, the Hall mobility decreased and electrical resistivity increased, which was attributed to the lattice distortion. The thermal conductivity decreased with increasing Sb₂Se₃ content mainly due to the decrease of the electronic thermal conductivity. However, the (κ-κ_(el)) value was not changed with the addition of Sb₂Se₃, and the most plausible explanation for such phenomena appeared to be the existence of the photon thermal conductivity in addition to the electronic and phonon thermal conductivity. The 2 wt% excess Te-doped (25% Bi₂Te₃-75% Sb₂Te₃)_(0.913)(Sb₂Se₃)_(0.087) single crystal exhibited the maximum figure-of-merit of 2.45×10^(-3)/K at 310K.

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