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    Experimental study and numerical simulation for the development of critical performance parameters of eco-friendly Cu2ZnSnS4-based solar cells
    (Elsevier Sci Ltd, 2023) Belarbi, F.; Matur, U. C.; Tamin, C.; Rahal, W.; Benghabrit, S.; Baydogan, N.; Adnane, M.
    This work aims to study the basic Characteristics of CZTS thin films produced by chemical solution process in addition to a numerical study of the CZTS-based solar cells. In this context, eco-friendly and cost effective thin films of CZTS were coated on glass substrates by sol-gel dip-coating method. This method is used to grow crystalline CZTS thin films without sulfidation processes. The structural and optical properties have been carried out by X-ray Diffraction (XRD) and UV/Visible spectroscopy. The oxidation states of CZTS thin film have been studied by, X-ray photoelectron spectroscopy XPS analysis. The performance of CZTS solar cells has been investigated with the simulator SCAPS-1 D. The impact of different parameters like the CZTS absorber layer thickness, the carrier doping density and the operation temperature has been studied to get better understanding of the properties of our cells.
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    Tracking optical properties of ZnO:Mg thin films: Experimental and first principles calculations
    (Elsevier Sci Ltd, 2022) Matur, U. C.; Duru, I. P.; Akcan, D.
    As low-cost transparent conducting oxides (TCO), ZnO based materials have been widely used in flat panels, sensors, glasses and transparent electronic systems. ZnO based thin films are preferable instead of other TCO materials such as Indium Tin Oxides (ITO) due to electrochemical stability, non-toxicity, low cost. The physical and chemical properties of ZnO based devices depend on the stoichiometry, amount of impurity (dopant), and deposition method. In this study Mg doped zinc oxide (MZO) thin films with doping ratio varying from 1% to 5% were deposited by sol-gel dip coating method to improve the physical characters by forming the grain size. Structural and optical properties were investigated by means of XRD analysis, ultraviolet-visible (UV-VIS) and photoluminescence (PL) spectroscopy. Moreover, DFTB + method was preferred to determine electronic properties based on structural information obtained from XRD analysis. Experimentally determined band-gaps were compared with theoretically calculated gap values in which oxygen vacancies are considered.