Header menu link for other important links
X
Amorphous-crystalline transitional effect on the optical behavior of Se80Te20 thin films
A. V.R.L. Sudha, K. Srinivasa Raghavan
Published in Marcel Dekker Inc, New York
1999
Volume: 14
   
Issue: 4
Pages: 547 - 557
Abstract
Thin films of amorphous Se80Te20 alloys with thickness around 250 nm were prepared by vacuum deposition. The as-grown films were annealed in an Argon atmosphere as a function of temperature and time. Optical characterization of the films through various degrees of crystallinity was done in order to estimate the influence of the heat treatment on the optical properties of the thin films. The optical constants of all films, viz., refractive index (n), extinction coefficient (k), absorption coefficient (α) and band gap (Eg) were calculated from the transmission spectra recorded in the wavelength region 400-1900 nm. For the as-deposited films, Eg is found to be 1.5 eV. It is found that the values of Eg are sensitive to the annealing temperature and it increases with increase in temperature. The reasons for the observed variation of optical properties with annealing temperatures are discussed. Also, the different stages of crystallinity were identified using transmission electron microscopy (TEM). It is evident from the results that the thermal treatment of Se80Te20 films has a significant influence in the variation of structural and optical properties of these films and these variations seem to indicate applications in switching devices.
About the journal
JournalMaterials and Manufacturing Processes
PublisherMarcel Dekker Inc, New York
ISSN10426914
Open AccessNo
Concepts (16)
  •  related image
    Amorphous alloys
  •  related image
    Annealing
  •  related image
    Crystal structure
  •  related image
    Film growth
  •  related image
    Heat treatment
  •  related image
    Metallic films
  •  related image
    Optical properties
  •  related image
    Phase transitions
  •  related image
    Temperature
  •  related image
    Thickness measurement
  •  related image
    Transmission electron microscopy
  •  related image
    AMORPHOUS CRYSTALLINE TRANSLATIONAL EFFECT
  •  related image
    Band gap
  •  related image
    Crystallinity
  •  related image
    SELENIUM TELLURIDE THIN FILMS
  •  related image
    Selenium