ULTRAVIOLET REFLECTIVITY SPECTRA OF CDS1-XSEX SINGLE CRYSTALS

The fundamental reflectivity of single-crystal platelets of CdS1-xSex has been measured at 90°K with linearly polarized light of wavelength longer than 1100. Measurements were performed with the electric vector parallel and perpendicular to the c axis of the crystal. The transitions E1(A1, A2, B), E0′, F1, E2, a shoulder on the low-energy side of E2, and E1′ were followed across the composition range. The structure in the reflectivity curves is interpreted in terms of existing knowledge of the band structure of wurtzite materials. © 1968 The American Physical Society.