Abstract
Photoluminescence (PL) spectra of n-ZnSe single crystals doped with Au are investigatedat temperatures between 4.4 and 300 K immediately after doping and after storage forfour years at room temperature in darkness in air. The formation of donor-typeAui interstitial defects stimulated by time is found in ZnSe for the first time.Changes in the structure of the edge and long-wavelength PL spectra withthe course of time are observed. The long-wavelength band attributed to(AuZn-DIII,VII) acceptors is not found in the PL spectra of the stored samples. At the same time, a greenPL band with maximum at 527 nm (2.35 eV) appears. This band is ascribed to(VZn–Aui) acceptors formed as a result of displacement of theAuZn atoms into interstitial sites due to deformation forces. When the Au concentration in theZn + Au meltexceeds 1 at.%, an Aui-donor impurity band is formed and the intensities of all the PL bands are reduced.
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