TRACER DIFFUSION OF INDIUM IN CUINS2

The tracer diffusion coefficient of In-111 has been investigated in th e chalcopyrite CuInS2 at 650 degrees C for different sulfur partial pr essures p(s2). The unusual shape of the profiles are attributed to two different volume diffusion processes of indium in the compound giving rise to two diffusion coefficients D-1 and D-2*. The observed decrea se of the tracer diffusion coefficients with increasing P-s2 is discus sed in respect to the point defect structure of CuInS2 and the migrati on mechanisms of cations in the chalcopyrite structure.