Variation of Optical Constants in Ge10se60te30 Thin Film

Abstract

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 cross-linking 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 a-Ge10Se90 system and then replace the Se by 30 at. % of Te. The optical properties of the thin films of the prepared samples are calculated using the transmission spectrum in the range 400-1200 nm.