Yazar "Kahveci, Osman" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ N/A ]
    Öğe
    Amplifying main physical characteristics of CuO films using ascorbic acid as the reducer and stabilizer agent
    (Springer Heidelberg, 2021) Akkaya, Abdullah; Kahveci, Osman; Aydin, Rasit; Sahin, Bunyamin
    Copper oxide thin films have been grown by successive ionic layer adsorption and reaction technique, which is inexpensive, environmentally friendly and simple onto soda-lime glass substrates from an aqueous copper (II) chloride dehydrate solution with and without the addition of ascorbic acid (AA) at 70 degrees C. Surface morphology, crystalline structure, chemical compositions, optical and electrical properties of thin films were investigated with a focus on the influences of different concentrations of AA. The analysis exhibited that the main physical performances of the CuO films were found to change with AA content. Estimated crystallite sizes decreased from 24.64 to 12.78 nm with the addition of AA in the growth bath solutions. The optical bandgap energy of CuO is found to increase from 1.42 to 1.55 eV as a consequence of the increasing AA content. As the AA concentration in the solution bath increases the transmittance increases from approximate to 5 to approximate to 28%. FTIR transmittance spectra of CuO have a characteristic stretching vibration mode of the metal-oxide bonds and the addition of AA caused the appearance of many peaks of this molecule. Contact resistance values decreased with the AA content from 0.657 x 10(9) to 0.342 x 10(9) omega. It is worth noting that the deposition technique is low cost and very simple; obtained CuO thin films could be appropriate for different technological applications.
  • [ N/A ]
    Öğe
    Growth and characterization of Fe-doped CuO/ZnO binary oxide thin films for possible optoelectronic applications
    (Elsevier, 2024) Sogan, Serra; Yucel, Ersin; Sarikaya, Ebru Karakas; Kahveci, Osman; Aydin, Rasit; Akkaya, Abdullah; Sahin, Buenyamin
    Nanoscale binary oxide thin film structures of pristine and Fe-substituted CuO/ZnO have been produced on sodalime glass substrates by the SILAR method and characterized by different acceptable analytical approaches. The more irregular and lumpy ZnO in the pristine CuO/ZnO binary thin film sample evolved into more regular and hexagonal prismatic structures with the addition of Fe. XRD patterns of the samples indicated that both monoclinic CuO and hexagonal ZnO phases were present without any impurities. Optical analyses by meaning absorbance and transmittance measurements exhibit an important change in the energy band gap and transmittance value with the Fe doping ratio. The energy band edges of the bare sample shift to red with increasing Fe percentage in the starting solution, presumably due to an increase in the carrier concentration. The transfer length method (TLM) is used to define the conductivity properties of the samples, which considers the contact properties and structural features of thin films. The minimum specific contact resistivity of 0.865 x 10 6 Omega square was obtained by 3.0 % Fe-implemented CuO/ZnO binary oxide samples, and the addition of Fe increased the effective transfer length of thin films.