Photoinduced absorption edge shift of As20Se60Tl20 films |
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Authors: | A El-Denglawey M Dongol |
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Institution: | a Physics Department, Faculty of Science, South Valley University, Qena 83523, Egypt b Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt |
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Abstract: | As20Se60Tl20 bulk material was prepared firstly then thermal evaporation method was used to prepare As20Se60Tl20 films. Illumination effect at room temperature for the mentioned films has been studied within the homogeneous glass-forming region. The prepared film samples were amorphous, this is depicted by X-ray chart. Optical properties have been studied using spectrophotometric measurements. The absorption edge was shifted to shorter wavelengths due to light exposure or photobleaching effect. It was found that the extinction coefficient and the optical band gap have opposite character after illumination. |
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Keywords: | Chalcogenide glasses Photoinduced phenomena Amorphous films Band gap light illumination Photobleaching |
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