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Structural and Ellipsometric Properties of Gas(X)Se(1-X) Layered Mixed Crystals

BROWSE_DETAIL_CREATION_DATE: 19-12-2017

BROWSE_DETAIL_IDENTIFIER_SECTION

BROWSE_DETAIL_TYPE: Thesis

BROWSE_DETAIL_SUB_TYPE: Masters

BROWSE_DETAIL_PUBLISH_STATE: Unpublished

BROWSE_DETAIL_FORMAT: PDF Document

BROWSE_DETAIL_LANG: English

BROWSE_DETAIL_SUBJECTS: Physics,

BROWSE_DETAIL_CREATORS: Habaibi, Om-Alhana S. Ali (Author),

BROWSE_DETAIL_CONTRIBUTERS: Korkmaz Özkan, Filiz (Advisor),

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GaSe, GaS, Ellipsometry, Layered crystals, Structural properties


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GaSxSe1-x layered mixed crystals were investigated using structural and optical characterization techniques. Structural characterization of samples grown by Bridgman method were accomplished using x-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and fourier transform infrared (FTIR) spectroscopy techniques. Compositional dependence of mixed crystals were obtained from EDS experiments. Results of measurement indicated that used samples correspond to composition of x varying from 0 to 1 by 0.25 intervals. The crystal structures of the samples were revealed using the results of XRD measurements and a software program for analyses. FTIR spectra of the samples indicated the presence of multiphonon absorptions in the samples for compositions of x = 0, 0.25 and 0.50. The results of XRD and FTIR experiments were associated between the used compositions.Optical characterization of the samples were achieved by ellipsometry experiments carried out in the spectral range of 1.2-6.0 eV. The output data of measurement system were converted to data presenting the spectral dependency of optical parameters. Ellipsometric data was used to obtain the band gap energy of the samples. Obtained band gap energy values showed that as sulfur composition is increased in the mixed crystals, band gap energy increases from 2.04 eV (x = 0) toiv2.57 eV (x = 1). According to revealed band gap energy values, a graph presenting the compositional dependence of bang gap energy was plotted.


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