We have performed open-tube diffusion of Zn into n-type InP over the temperature range 525–675 °C. For heavily doped InP, the observed diffusion profiles are consistent with an interstitial-substitutional model where the interstitial Zn is doubly ionized. However, for undoped InP the profiles have a significantly different shape and the diffusion is deeper. Assumption of neutral interstitial Zn is able to account for these two changes. A tentative model is proposed to explain the dependence of the interstitial Zn ionization state on the starting substrate dopant concentration.
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Serreze et al. (1986) studied this question.
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