Abstract
ZnS epilayers were grown on (1 0 0) semi-insulating GaAs substrates using an atmospheric pressure metal-organic chemical vapor deposition (CVD) technique under the atomic-layer epitaxy (ALE) mode. Atomic force microscopy (AFM) and photoluminescence (PL) measurements were carried out to find the effect of the II–VI ratio of the 30-nm thick ZnS epilayers and to investigate the thickness-dependent characteristics of ZnS epilayers with the thicknesses of 30 and 100 nm. While the II–VI ratio-dependent ZnS quality is consistent regardless of the measurement, the thickness-dependent epilayer quality is quite contrary depending on the measurement. This difference demonstrates the non-uniform distribution of the strain–relaxation in the ZnS epilayer along the depth.
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