Adarsh, KV and Sangunni, KS (2006) Photoinduced interdiffusion in nanolayered $Se/As{_2}S{_3}$ films: Optical and x-ray photoelectron spectroscopic studies. In: Journal Of Applied Physics, 99 (9). 094301-1-094301-6.
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Abstract
Photoinduced interdiffusion was observed with above band gap light in nanolayered Se/As2S3 films. It is discussed in terms of the optical parameters such as band gap, Urbach edge (E-e) [F. Urbach, Phys. Rev. 92, 1324 (1953)], and B-1/2 (Tauc's parameter) [J. Tauc , Phys. Status Solidi 15, 627 (1966)]. Experimental data of B-1/2 and E-e for as-prepared samples do not show clear correlation implied by the Mott-Davis model [N. F. Mott and E. A. Davis, Electronic Process in Non-crystalline Materials (Clarendon, Oxford 1979), p. 287]. It is also shown that the optical parameters can be changed with a change in the Se sublayer thickness. Variations of these optical parameters as a function of modulation period and photoinduced interdiffusion were discussed in terms of the quantum confinement effect and changes in the valence and conduction bands. We proposed a model to explain the mechanism of Se diffusion in As2S3, which suggests that diffusion takes place through the wrong bonds. X-ray photoelectron spectroscopy (XPS) is used to investigate the chemical alternations in the bonding. The proposed model was supported by the XPS data.
Item Type: | Journal Article |
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Publication: | Journal Of Applied Physics |
Publisher: | American Institute of Physics |
Additional Information: | Copyright of this artcle belongs to American Institute of Physics. |
Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
Date Deposited: | 06 Apr 2009 07:22 |
Last Modified: | 29 Feb 2012 05:22 |
URI: | http://eprints.iisc.ac.in/id/eprint/17758 |
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