It is shown that recently obtained data for the thermal ionisation energy of donors in InP exhibit the usual dependence on the concentration of ionised donor centres. It is suggested that the parameter in the semi-empirical relationship E = E 0 - alpha N 1/3 shows a definite correlation with the static dielectric constant in various semiconductors as predicted by a simple model based on Coulomb interactions.
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B. Pődör (1987) studied this question.