OPTICAL-PROPERTIES OF WSI2 AND MOSI2 SINGLE-CRYSTALS AS MEASURED BY SPECTROSCOPIC ELLIPSOMETRY AND REFLECTOMETRY

The dielectric functions of monocrystalline MoSi//2 and WSi//2 and their reflectivity have been investigated. A comparison is established between these two silicide and several differences are underlined. Absorption seen from the dielectric function and the reflectivity are suggested to come from sets of d orbitals bands below and above the Fermi level. In the Infra-red, both materials exhibit different transparency windows, at 0. 46 and 0. 6 ev respectively, attributed to partly covalent Si-bonding. These silicide are potential intrinsic solar absorbers.