Abstract
Hall effect and Thermally Stimulated Currents (TSC) measurements have been carried out with the current flowing perpendicular to the c-axis on n-GaS crystals grown both from the melt by the Bridgman-Stockbarger method and from the vapour by chemical transport with iodine. An impurity hopping conduction with an activation energy of 0.2 eV has been evidenced in the range of temperatures between 200 and 300 K. The results of TSC measurements indicate the iodine as being responsible for a donor level at 0.44 eV from the conduction band.
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