Author/Authors :
Vassilev، نويسنده , , V. and Boycheva، نويسنده , , S. and Popov، نويسنده , , C. and Petkov، نويسنده , , P. and Aljihmani، نويسنده , , L. and Monchev، نويسنده , , B. and Kolev، نويسنده , , K.، نويسنده ,
Abstract :
Amorphous thin films from the system As2Se3–Ag4SSe–SnTe were prepared by thermal vacuum evaporation from the corresponding bulk glassy samples. The film structure and surface morphology were investigated by scanning electron microscopy and atomic force microscopy; the results revealed uniform, smooth and homogeneous coatings. The amorphous chalcogenide films are transparent in a wide spectral range as shown by transmission and reflection measurements in the VIS and NIR regions. The optical band gap was determined and its compositional dependence is discussed in terms of structural considerations and the formation of charged defect centers.
