Abstract
The diffusion of Zn in CdTe has been studied in the temperature range 400–900°C by both SEM and radiotracer methods. A simple diffusion model has been used to analyse the results but the variation in diffusion coefficients, 10 -11 to 10 -9 cm 2 s -1, together with further experimental evidence clearly indicates that a complex multi-diffusion process is taking place and needs to be taken into consideration. It has been shown that when one surface of a CdTe slice was prepared for a diffusion anneal with a pure Zn source in the temperature range 550–700°C, the slice took on a curved shape, which did not occur outside this temperature range. This was due to a differential stress set up across the slice which was relieved by brittle fracture at temperatures below 600°C and by ductile slip at temperatures above this value.
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