Abstract
Abstract Nuclear radiation detectors made from high resistivity CdTe have a solid state ionisation chamber structure, with a nearly ohmic contact. Gold contacts were formed by electroless or electrolytic deposition. In order to understand the mechanisms involved at the interface between gold and semi-insulating p-type CdTe, a systematic investigation has been undertaken with different types of thermal cycling, including annealing in various atmospheres (hydrogen, argon, vacuum) at temperatures up to 250°C. The effects of these treatments have been investigated by current-voltage ( I–V ) curves, thermally stimulated current measurements (TSC). nuclear radiation detection and Rutherford backscattering (RBS) measurements. The results of these investigations on the variations in the barrier height with different treatments will be discussed.
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