Electrical and Thermal Properties of Bi2 Te3
Abstract
Samples of both n-type and p-type Bi2Te3 containing from 3×1017 to 5×1019 extrinsic carriers were prepared and the phase diagram in the region about Bi2Te3 has been clarified. The Hall mobility parallel to the cleavage planes varies as T-1.5 for holes and T-2.7 for electrons. Room temperature values are μp=420 cm2 v-1 sec-1 and μn=270 cm2 v-1 sec-1. The energy gap is Eg=0.20 electron volts. From thermal conductivity measurements over the temperature range from 77°K to 380°K the lattice conductivity was found to be κL=5.10×10-2T watt-deg-1 cm-1. The sharp rise in the thermal conductivity in the vicinity of room temperature was attributed to transport of energy by ambipolar diffusion of electrons and holes.
- Publication:
-
Physical Review
- Pub Date:
- December 1957
- DOI:
- 10.1103/PhysRev.108.1164
- Bibcode:
- 1957PhRv..108.1164S