Reflectivity spectra of structurally pure wurtzite-type ZnS in ultraviolet and vacuum-ultraviolet regions

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Abstract
There has been a significant discrepancy among the reflectivity spectra of wurtzite-type ZnS reported previously. The spectrum measured by Baars with structurally pure wurtzite-type ZnS is different from the other spectra which are very close to that of the cubic phase. In addition, the one by Baars shows a distinct polarization dependence, while the others show a very weak or no polarization dependence. From our reflectivity study on structurally pure wurtzite-type ZnS, we are confident that the discrepancy is caused by the structural difference of the samples. The spectrum measured in this work is in good agreement with that of Baars and appreciably different from that of the cubic phase. The energy positions of peaks in our spectrum are consistent with the values deduced from reflectivity data on ZnS-CdS alloys.
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