By means of deep-level transient spectroscopy, an irreversible electromigration of ions was observed in the space-charge region of Schottky contacts on Se-doped Cd0.7Hg0.3Te crystals. The amplitudes of the observed deep-level transient spectroscopic lines changed when a reverse bias was applied at temperatures higher than room temperature. Two of the lines (H2, H4) were found to be related; in that the amplitude of H2 increased, with applied reverse bias time, as that of H4 decreased. This was explained in terms of a model that was based upon the dissociation of an acceptor-donor complex in the space-charge region.

B.O.Wartlick, J.F.Barbot, W.Schroeter, C.Blanchard: Physica Status Solidi A, 1995, 148[1], 111-21