Abstract
The quenching mechanism of the self-activated (SA) and Cu-Cl photoluminescence (PL) bands and 1.05 eV PL band in Zn(SeTe) solid solutions are investigated. It is supposed that SA and Cu-Cl PL bands in ZnTe-rich Zn(SeTe) solid solutions are quenched due to the complex defects TeiClTe and Tei2ClTe, which formation decrease the VZnClTe and single ClTe concentration. This assumption is confirmed experimentally. By annealing under Zn vapour pressure the intensity of SA and Cu-Cl PL bands in ZnTe-rich Zn(SeTe) solid solutions are restored. It is supposed that 1.05 eV PL band in ZnTe is formed due to a Te excess in ZnTe and the VTe-Tei pair is proposed for this band.
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