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DS: Dünne Schichten

DS 24: Poster presentation

DS 24.49: Poster

Tuesday, March 28, 2006, 15:00–17:30, P2

Effect of the Heat Treatment on the Structural and Optical Characteristics of Polycrystalline ZnTe Thin Films — •Rusu Gheorghe and Prepelita Petronela — Faculty of Physics Al. I. Cuza University, Iassy, R-700506, Romania

ZnTe thin films have been intensively studied in the last years. ZnTe thin films (d =230 - 2150 nm) were deposited onto glass substrates by the quasi-closed volume technique under vacuum. It was established that the films with stable structure can be obtained if they, after deposition, are subjected to a heat treatment. The structure analysis of the films was performed by X-ray diffraction (XRD) technique and atomic force microscopy (AFM). The structural investigations performed by means of XRD technique showed that the films have a polycrystalline and blende (cubic) structure. They are highly oriented with the (111) planes parallel to the substrate. AFM images showed that have a grain like surface morphology. The values of the optical parameters (refractive index and absorption coefficient) were determined from transmission spectra (in the spectral range 500-1400nm) using Swanepoels method. The effect of heat treatment on the shape of the transmission and absorption spectra is studied for samples with different thickness. Optical energy gap, calculated from the absorption spectra was in the range 1.9eV-2.4eV.