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Changes in donor and acceptor states in Au-doped ZnSe samples induced by ageing at room temperature

Photoluminescence (PL) spectra of n-ZnSe single crystals doped with Au are investigated at temperatures between 4.4 and 300 K immediately after doping and after storage for four years at room temperature in darkness in air. The formation of donor-type Aui 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 with the 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 green PL 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 the AuZn atoms into interstitial sites due to deformation forces. When the Au concentration in the Zn + Au melt exceeds 1 at.%, an Aui-donor impurity band is formed and the intensities of all the PL bands are reduced.