Nano Archive

Kinetics and chemical analysis of photoinduced interdiffusion in nanolayered Se/As2S3 films

Adarsh, K. V. and Naik, Ramakanta and Sangunni, K. S. and Kokenyesi, S. and Jain, H. and Miller, Alfred C. (2008) Kinetics and chemical analysis of photoinduced interdiffusion in nanolayered Se/As2S3 films. Journal of Applied Physics, 104 (5). 053501. ISSN 0021-8979

Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.

Official URL: http://scitation.aip.org/getabs/servlet/GetabsServ...

Abstract

We have studied the kinetics of photoinduced effects in nanolayered Se/As2S3 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 As2S3 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:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:5030
Deposited By:JNCASR
Deposited On:27 May 2009 11:02
Last Modified:27 May 2009 11:02

Repository Staff Only: item control page