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Photo- and thermally induced property change in Ag diffusion into Ag/As2Se3 thin films

Aparimita, Adyasha and Sripan, C and Ganesan, R and Naik, Ramakanta (2018) Photo- and thermally induced property change in Ag diffusion into Ag/As2Se3 thin films. In: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 124 (3).

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Official URL: http://dx.doi.org/10.1007/s00339-018-1692-4

Abstract

In the present report, we have prepared As2Se3 and bilayer Ag/As2Se3 chalcogenide thin films prepared by thermal evaporation process. The top Ag layer is being diffused into the bottom As2Se3 layer by 532 nm laser irradiation and thermal annealing process. The photo and thermal energy drives the Ag+ ions into the As2Se3 matrix that enhances the formation of As-Se-Ag solid solution which shows the changes of optical properties such as transmission, absorption power, refractive index, and optical band gap. The transmission power drastically decreased for the thermal-induced film than the laser induced one; and the reverse effect is seen for the absorption coefficient. The non-linear refractive index is found to be increased due to the Ag diffusion into -As2Se3 film. The indirect allowed optical band gap is being reduced by a significant amount of 0.17 eV (thermal diffusion) and 0.03 eV (photo diffusion) from the Ag/As2Se3 film. The Ag diffusion creates chemical disorderness in the film observed from the two parameters which measures the degree of disorder such as Urbach energy and Tauc parameter. The structural change is not noticed in the studied film as seen from the X-ray diffraction pattern. Scanning electron microscopy and atomic force microscopy investigations showed that the surface morphology was influenced by the diffusion phenomena. The change in optical constants in such type of film can be used in optical waveguides and optical devices.

Item Type: Journal Article
Additional Information: Copy right for the article belong toSPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 03 Apr 2018 18:27
Last Modified: 03 Apr 2018 18:27
URI: http://eprints.iisc.ac.in/id/eprint/59457

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