Interactions between In donors and Ag, Cu and acceptor-like native defects were studied, in p-type and n-type monocrystals, by means of the perturbed angular correlation spectroscopy of 111In probe atoms. The diffusion of Ag into the p-type samples at room temperature resulted in the formation of a distinct complex which was characterized by an interaction frequency of 60.1MHz and an asymmetry parameter of 0.15. At room temperature, the relative fraction of this complex increased within a few hours and decreased with a significantly longer time constant. After doping with Cu, a similar complex (with parameters of 57.5MHz and 0.16) was observed. However, this did not exhibit any decrease. The observed behavior was explained by the rapid diffusion of Ag (or Cu) via an interstitial mechanism, and by interactions with cation vacancies. Finally, In-Ag (or In-Cu) complexes were formed.

M.Rüb, N.Achtziger, J.Meier, U.Reislöhner, P.Rudolph, M.Wienecke, W.Witthuhn: Journal of Crystal Growth, 1994, 138[1-4], 285-9