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Effect of Gamma Irradiation on Structural and optical properties of Thin Films of a-Cd5Se95-xZnx |
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PP: 103-109 |
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Author(s) |
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Shabir Ahmad,
K. Asokan,
M. Zulfequar,
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Abstract |
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| We report the gamma irradiation effect on the structural and optical properties of a-Cd5Se95xZnx (x=0, 2, 4) thin films. Thin films were prepared by thermal evaporation technique at a base pressure of 10-5 torr. The investigated thin films of ~ 200 nm thickness are then irradiated by 25-100 kGy doses of 60co gamma rays. The elemental composition of as-deposited thin films of Cd5Se95-xZnx (x=0, 2, 4) were verified by RBS spectrometry shows good agreement with the actual elemental composition. XRD, PL and FT-IR study confirms the crystallinity of the investigated thin films increases after gamma irradiation. The optical parameters were estimated from optical absorption spectra data measured from UV-vis-spectrophotometer. It was found that the value of optical band gap of investigated thin films decreases and the corresponding absorption coefficient increases up to 75 kGy dose of gamma irradiation. This post irradiation change in the values of optical band gap and absorption coefficient were interpreted in terms of increase in crystallinity of the material after gamma irradiation. |
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