SEMICONDUCTING PROPERTIES OF TL2TE3 SINGLE-CRYSTALS

Electrical conductivity and Hall effect measurements were Performed on single crystals of Tl2Te3 to have the general semiconducting behaviour of this compound. The measurements were done at the temperature range 160 - 350 K. All crystals were found to be of p-type conductivity. The values of the Hall coefficient and the electrical conductivity at room temperature were 1.59 x 10(3) cm3/coul and 3.2 x 10(-2) OMEGA-1 cm-1, respectively. The hole concentration at the same temperature was driven as 39.31 X 10(11) cm-3. The energy gap was found to be 0.7 eV where the depth of impurity centers was 0.45 eV. The temperature dependence of the mobility is discussed.