The solubility and diffusion of copper in germanium

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Abstract
From a review of the data on the solubility of copper in germanium, it is concluded that the substitutional and interstitial equilibrium solubilities maybe described by respectively, over the temperature range 450-950°c. From these values it is shown that the activation energy of D 1 (the effective coefficient of inter-stitially limited dissociative diffusion) will be slightly less than the activation energy of true interstitial diffusion. This is shown to be consistent with the difficulty, found earlier, of determining a temperature dependence for the measured high diffusion coefficients for Cu in Ge. It is also shown that the obtained from the above Gs' and the self-diffusion coefficient for germanium, is consistent with the lower diffusion coefficients measured for Cu in Ge. This supports the interpretation of the tracer self-diffusion coefficient of germanium in terms of a monovacancy mechanism.