Refractive index, band gap and Optical conductivity of PVP doped K2Cr2O7 thin films

Chalcogenide glasses are good candidates for applications in the infrared (IR) region [1,2].Chalcogenide glasses are vitreous materials having one or more of the chalcogen elements (Group VI): sulfur (S), selenium (Se), and tellurium (Te). The addition of the network formers (Group IV and V) such as silicon (Si), germanium (Ge), tin (Sn), phosphorus (P), arsenic (As), and antimony (Sb) establishes crosslinking between the tetrahedral and pyramidal units which facilitates stable glass formation [3,4]. Depending on the composition, the chalcogenide glasses are stable against crystallization and are chemically inert. They have excellent thermal stability, and are relatively easy to fabricate. In our present work we have taken the SeO2 powder and then solvent (DMF),put on stirrer for 30 min. The mixed deposited on glass substrate by casting method. The optical properties of the thin films of the prepared samples are calculated using the Absorbance spectrum in the range 250- 600nm.