On the conduction mechanism and thermoelectric phenomena in In6S7 layer crystals

Abstract

In the present paper, measurements of the electrical conductivity and Hall coefficient on single crystal of In6S7, grown by a new crystal growth technique, were done. The crystal was found to be of n-type conductivity. The low conductivity sample showed as the most striking feature an exponential increase of the Hall mobility with temperature. This effect was explained by assuming a mixed conduction and different scattering mechanisms for electrons and holes in the same temperature range. Also we have made thermoelectric power measurements to support this assumption. An energy gap of 0.64 eV was found.