Abstract
The diffusion of lithium at 300°C has been studied in CdTe samples in which the native defect concentration was fixed by preliminary heat treatments in Cd and Te vapors. It has been found that at low temperatures lithium diffuses in two forms characterized by two different diffusion mechanisms. The high-concentration, slowly diffusing form depends on the cadmium vacancy concentration (via the nature of heat treatment) whereas the low-concentration, fast-diffusing form is independent of it. The experimental results were analyzed in terms of Kucher's phenomenological theory. This theory supposes the simultaneous diffusion of the diffusing species in two different forms with exchange interaction between them. Whereas the rapid form is likely to be interstitial lithium, the slowly diffusing one is lithium interacting with cadmium vacancies, probably in a nonsimple configuration.
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