Regensburg 2002 – wissenschaftliches Programm
HL 35.5: Vortrag
Donnerstag, 14. März 2002, 13:00–13:15, H13
Optical properties of thin Ag containing chalcogenide films — •R. Kirov1, P. Petkov1, and U. Kreibig2 — 1University of Chemical Technology, Department of Physics, 1756 Sofia, Bulgaria — 2Aachen University of Technology, Department of Physics, 52074 Aachen, Germany
The present work deals with optical investigations of thin films from the Ag-Se-Te system. The bulk glasses have been synthesised from the initial elements with Ag content 0-25 at.%. Thin films from the bulk glasses have been prepared by vacuum evaporation. Film’s composition has been checked by Auger electron spectroscopy and the identity of the film’s and bulk’s composition has been confirmed.
Transmission electron microscope analysis and electron diffraction have been used for morphology investigation. As a result, the films are amorphous. Spectra of the optical constants (n and k) were determined from the ellipsometric investigations.
Tauc’s procedure has been used for band gap calculation of the films.
The compositional relation of the band gap will be discussed as a result of the structural alternations due to the silver concentration in the glass matrix.