Energy of an Interstitial Donor in ZnSe from Pair Spectra

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Abstract
We report donor-acceptor-pair line luminescence from Na-doped ZnSe. The luminescence is "type II," and analysis gives an energy of 20 ±2 meV for the donor. From the spectrum type and the energy value we conclude that the donor must be an alkali-metal (Na or Li) interstitial ion. Prior evidence for such species in II-VI compounds has been circumstantial, and no reliable energy values have been available. Moreover, the magnitude of the energy value raises serious questions on the theory of shallow levels in compound semiconductors.