Kinetics and chemical analysis of photoinduced interdiffusion in nanolayered $Se/As_2S_3$ films

Adarsh, KV and Naik, Ramakanta and Sangunni, KS and Kokenyesi, S and Jain, H and Miller, Alfred C (2008) Kinetics and chemical analysis of photoinduced interdiffusion in nanolayered $Se/As_2S_3$ films. In: Journal of Applied Physics, 104 (5). 053501-1-053501-7.

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Abstract

We have studied the kinetics of photoinduced effects in nanolayered $Se/As_2S_3$ film by in situ optical absorption measurements, which reveal that photodarkening in these films is followed by photoinduced diffusion. An increase in disorder during photodarkening and its. subsequent decrease during photoinduced diffusion were also observed. The observation of photodarkening of Se at room temperature when confined between $As_2S_3$ layers suggests that the glass transition temperature of Se shifts to higher energy. The analysis shows that the atoms which take part in photodarkening play a vital role in photoinduced diffusion. The x-ray photoelectron spectroscopy measurements show the atomic movements during photoinduced diffusion. It also shows that some of the As-S bonds are converted into As-Se bonds. Since it is energetically difficult to break an As-S bond to form an As-Se bond, we assume that the new bond formations are taking place by the bond rearrangement mechanism.

Item Type:	Journal Article
Publication:	Journal of Applied Physics
Publisher:	American Institute of Physics
Additional Information:	Copyright for this article belongs to American Institute of Physics.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	31 Dec 2008 07:27
Last Modified:	29 Feb 2012 05:14
URI:	http://eprints.iisc.ac.in/id/eprint/16411

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