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From the results of first-principles pseudopotential calculations we identify a new type of low energy lattice instability that is most effective in acceptor passivation in II-VI semiconductors. The instability occurs in the presence of free holes and involves the breaking of two host bonds and the creation of a VI-VI dimer bond. The model provides a satisfactory explanation for persistent photoconductivity, its optical threshold, and for the observation of a deep ``donor'' level in photoluminescence measurements on p-doped samples.
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Park et al. (1995) studied this question.
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