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    Electrical Characterization of 6H-SiC/MEH-PPV/Al Schottky Diode by CurrentVoltage Measurements in A Wide Temperature Range
    (2021) Güzel, Tamer
    In this paper, the 6H-SiC/MEH-PPV/Al Schottky diode with polymer interface was fabricated and characterized using current-voltage data in the temperature range 80-400 K. Important parameters of the fabricated diode such as ideality factor, barrier height was calculated from current-voltage measurements. The saturation current also was determined from the plots obtained from experimental results. In addition, the series resistance of the diode was calculated by using Cheung and Norde methods. On the other hand, the calculated diode characteristics were discussed by comparing with the each other and literature. Strong dependence of the calculated characteristics on temperature has been determined.
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    Morphological and Thermal Characterization of Low-Cost Graphene Produced by Electrochemical Exfoliation Method
    (2024) Güzel, Tamer; İşlek, Yasemin; Yıldız, Oğuzhan
    The low-cost and mass production of graphene has gained importance in recent years. The electrochemical exfoliation method, one of the graphene production methods, is an efficient technique used to obtain low-cost-effective and large quantities of graphene nanosheets. Exfoliation parameters affect the properties of exfoliated graphene nanosheets. In this study, graphene production is fabricated by the method of exfoliation using electrolyte and voltage parameters. For this, a pen tip was used instead of pure platinum, which is very expensive, at the cathode. The structural research was done by X-ray diffraction spectroscopy (XRD), Raman spectroscopy and Fourier Transform Infrared Spectrometer (F-TIR). Morphological analyses were carried out by Scanning Electron Microscopy (SEM). The number of layers and crystallite of graphene layers were estimated. The obtained results were compared with the results of the other similar studies. Analysis results show that low-cost multilayer graphene can be produced by the electrochemical exfoliation method with the electrical parameters.