The influence of temperature on p-doping in Zn-diffused InP substrates has been investigated. By cooling the diffused InP samples very slowly after diffusion or subjecting them to heat treatment, significant out-diffusion of Zn has been observed. By heat-treating with rapid cooling, a substantial fraction of the incorporated but electrically inactive Zn atoms can be reactivated, resulting in a drastically increased acceptor concentration.
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Jung et al. (1987) studied this question.