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PHOTOINDUCED OPTICAL CHANGES IN VACUUM DEPOSITED NANOCRYSTALLINE As2S3 FILMS

J. Dikova1,* , Tz. Babeva1, Tz. Iliev2

Affiliation

  1. Central Laboratory of Photoprocesses “Acad. J. Malinowski”, Bulgarian Academy of Sciences, “Acad. G. Bonchev”str. bl. 109, 1113 Sofia, Bulgaria
  2. Geological Institute, Bulgarian Academy of Sciences, “Acad. G. Bonchev” str. bl. 24, 1113 Sofia, Bulgaria

Abstract

The optical properties of as-deposited and illuminated till saturation As2S3 films with amorphous and nanocrystalline structure are followed. It is established that within the spectral range l = 400‚1000 nm the crystalline samples are characterized by lower refractive index n and higher absorption coefficient k than the n, k values of the amorphous films. Besides, the optical band gap energy Eg for indirect allowed transitions in nanocrystalline samples is considerably smaller than this for amorphous ones. It is found that the photoinduced changes in the optical parameters and band gap energy are more pronounced in c-As2S3 films. On the basis of the results obtained the effect of granular microstructure on the optical behaviour of nanocrystalline As2S3 films is discussed..

Keywords

Amorphous chalcogenides, Thin films, Nanocrystalline structure, Optical properties.

Submitted at: April 19, 2005
Accepted at: May 26, 2005

Citation

J. Dikova, Tz. Babeva, Tz. Iliev, PHOTOINDUCED OPTICAL CHANGES IN VACUUM DEPOSITED NANOCRYSTALLINE As2S3 FILMS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 3, pp. 1281-1286 (2005)