Title :
Transport properties of the skutterudite CoSb3
Author :
Fess, K. ; Arushanov, E. ; Kafer, W. ; Kloc, Ch. ; Friemelt, K. ; Bucher, E.
Author_Institution :
Konstanz Univ., Germany
Abstract :
We prepared single crystals of CoSb3 by chemical vapor transport and from Sb-rich melt. We performed measurements of the resistivity, the Hall-effect and thermoelectric power over a large temperature range. The observed temperature dependence of the Hall-coefficient can be explained on the basis of an acceptor impurity band and an additional deep acceptor level. The values of the activation energies of the shallow and deep accepters, concentrations, as well as the concentrations compensating donors were calculated. The contributions of different scattering mechanisms were determined on the basis of many available parameters from the literature and our own measurements. It is shown, that the scattering due to polar and nonpolar optical phonons is the dominant process at high temperatures. The value of the valence band deformation potential is estimated
Keywords :
Hall effect; cobalt compounds; deep levels; electrical resistivity; electron-phonon interactions; impurity states; semiconductor materials; thermoelectric power; CoSb3; Hall-effect; Sb-rich melt; acceptor impurity band; activation energies; chemical vapor transport; deep acceptor level; nonpolar optical phonons; polar optical phonons; resistivity; scattering mechanisms; skutterudite; temperature dependence; thermoelectric power; valence band deformation potential; Chemicals; Conductivity; Crystals; Impurities; Optical scattering; Performance evaluation; Power measurement; Temperature dependence; Temperature distribution; 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.1997.667150