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Investigation of the effect of oxygen on the cathodoluminescence spectra and band gap of the ZnSxSe1-x alloy

Abstract:

The cathodoluminescence spectra of polycrystalline CVD ZnSxSe1−x alloy layers grown with the Zn excess are investigated. The dependence E g(x) is refined taking into account the location of exciton bands at 300 K. It is confirmed that the spectra are reconstructed on dissolving oxygen in the lattice under the effect of high pressures and temperatures of the gas-static treatment. The dependence of the self-activated emission on the alloy composition is observed for the accepted conditions of the gas-static treatment. For the compositions close to ZnSe (x < 0.5), the self-activated SAL band emerges. In contrast with this, only the short-wavelength shift of the SA band is observed for the compositions close to ZnS (x > 0.7), which is also most typical of the compounds themselves. These specific features are interpreted based on the calculations of the equilibrium of intrinsic point …