|
Document Type |
: |
Project |
|
Document Title |
: |
Study of Optical Constants of vacuum evaporated amorphous and annealed chalcogenide thin films دراسة الثوابت الضوئيه لاغشية رقيقة مصنفة من مواد امورفية بتقنية التبخير الحراري لمواد شالكوجينية ملدنة |
|
Subject |
: |
Study of Optical Constants of vacuum evaporated amorphous and annealed chalcogenide thin films |
|
Document Language |
: |
Arabic |
|
Abstract |
: |
Chalcogenide semiconductors have truly emerged as multipurpose materials and have been used to fabricate technologically important devices: IR detector, electronic and optical switches inorganic resist and optical recording media. Such wide ranging applications are possible due to some unique phenomena like photo induced structural transformations, photo darkening/bleaching and columnar collapsing etc., observed in these materials. In recent years, efforts are being made to develop chalcogenide based erasable optical storage media. Recently, thin films of amorphous chalcogenide glasses have been studied as materials for phase change optical storage. Optical properties of amorphous semiconductors have been investigated to understand how the energy band diagram, the shape of the band edges, the density and character of the energy states, the nature of the optical transitions, the transition probability between localized and non-localized states, selection rules, the nature, density and distribution of traps, photoconductivity mechanism and related transport properties and miscellaneous electro-optical effects are affected on going from crystalline to the amorphous phase of the same material.
The optical constants of thin films will be calculated by using optical absorption, reflection and transmission spectra of the thin films. On the basis of the values of optical parameters, one can use these materials as medium for data storage devices. Still the efforts are to develop the optical materials having large absorption coefficient and highly compositional dependence of reflection. These materials may be suitable for optical disk material. |
|
Publishing Year |
: |
1428 AH
2007 AD |
|
Added Date |
: |
Tuesday, July 13, 2010 |
|
Researchers
| شمشاد احمد خان | Khan, Shamshad Ahmad | Investigator | Doctorate | |
|