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    Optical characterization of Cu2ZnSnS4 nanocrystals thin film
    (SPRINGER, 2016) Kisnisci, Z.; Ozel, F.; Yuksel, O. F.; Tugluoglu, N.
    Synthesis of nanostructured powders of tetragonal Cu2ZnSnS4 (CZTS) nanocrystals was carried out based on the hot-injection process. High-quality CZTS thin films were prepared by spin coating method onto the Corning 1737 glass substrates. CZTS nanoparticles were characterized using X-ray diffraction (XRD), small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM) and high resolution TEM. It is observed that a good quality CZTS film can be obtained by spin deposition at room temperature. The optical properties of the film were studied using UV-visible spectra between 300 and 1000 nm wavelength range. The direct optical band gap of the film evolved as 1.49 eV. This value is close to the ideal band gap for highest theoretical conversion efficiency of solar cell. The optical absorption coefficients of the film between 300 and 1000 nm are found to be about 2 and 7.6 x 10(4) cm(-1), respectively. The optical dispersion parameters of the film were also determined by Wemple-DiDomenico single oscillator model.
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    Optical properties of perylene-monoimide (PMI) and perylene-diimide (PDI) organic semiconductor thin films
    (ELSEVIER SCIENCE SA, 2014) Kisnisci, Z.; Yuksel, O. F.; Kus, M.
    The optical properties of thin films of perylene-monoimide (PMI) and perylene-diimide (PDI), which are well known organic semiconductors, were determined using the spectroscopic measurements. For this purpose, optical measurements such as the absorption and reflection of films were performed in near ultraviolet, visible and near infrared spectral regions. Optical band gap of PMI and PDI were determined by means of absorption measurement. In addition, from the absorption and reflection spectra, the dispersion of several optical parameters of materials such as the absorption coefficient and the refractive index were calculated. Single oscillator dispersion analysis was performed based on the Sellmeier equation and some relevant dispersion parameters obtained. (C) 2014 Elsevier B.V. All rights reserved.