The perturbed angular correlation of -rays, using 111In nuclear probes, was applied to the study of phase formation in thin films that were used to prepare CuInS2 by reactive annealing in an H2S atmosphere. The films were made by the successive thermal evaporation of In and Cu in an ultra-high vacuum. It was found possible to obtain accurate images of all of the In-containing phases in the sample. Improved perturbed angular correlation parameters were obtained for Cu7In3, Cu11In9 and In2Cu. The phase compositions of Cu-rich, stoichiometric and In-rich samples were investigated after annealing at temperatures between ambient and 150C. Phase formation in this temperature region was governed by 2 fast diffusion processes which led to the appearance of only Cu11In9 and In2Cu.

C.Dzionk, H.Metzner, H.J.Lewerenz, H.E.Mahnke: Journal of Applied Physics, 1995, 78[4], 2392-7