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Hall data on ZnSe, CdS, CdSe, and CdTe have been analyzed to determine the shallow-donor ionization energies Ed and the total donor and acceptor impurity concentrations Nd and Nₐ, respectively. Lowering of the Ed values owing to impurity concentration effects are noted even in the purest samples. When the data are analyzed using linear plots of Ed vs (N_d⁺)1/3, the resulting values of the ionization energy for infinite dilution are in good agreement with optical data and with the hydrogenic model.
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Woodbury et al. (1974) studied this question.
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