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    Effect of molar concentration on the structural, linear and nonlinear optical properties of CuS (covellite) thin films
    (Pergamon-Elsevier Science Ltd, 2022) Habiboglu, C.; Erken, O.; Gunes, M.; Yilmaz, O.; Cevlik, H. C.; Ulutas, C.; Gumus, C.
    CuS thin films with various molar concentrations at 70 degrees C temperature were deposited by Chemical Bath Deposition. The effect of molar concentration on the structural, linear optic, nonlinear optic and morphological properties of CuS films were deeply investigated. X-ray diffraction (XRD) analysis exhibited that CuS films were formed in polycrystal structure and hexagonal phase. The fundamental optical parameters of films such as energy band gap, reflection and extinction coefficient were determined with the results of optical transmission and optical absorption by UV-vis spectrophotometer. The energy band gap values were reduced with increasing films thickness. Moreover, the dependence of the optical dielectric constants, loss tangent, optical conductivity, surface and volume energy loss function values on the molar concentrations were studied. Furthermore, the third order nonlinear optical susceptibility and nonlinear refractive index, which is considered to be the base of the first order optical susceptibility with nonlinear optical properties were discussed in detail.
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    Öğe
    The influence of trisodium citrate dihydrate complexing agent on the structural, electrical and optical properties of ?-MnS thin films
    (Springer, 2023) Budak, Z.; Ulutas, C.; Yilmaz, O.; Cevlik, H. C.; Gunes, M.; Gumus, C.
    gamma-MnS films were prepared using trisodium citrate (TSC) complexing agents at different molarity values (0.5, 1 and 1.5 M). Characterization techniques such as X-ray Diffraction (XRD), optical absorption spectra, Field Emission-Scanning Electron Microscope (FE-SEM), Energy Dispersive X-ray (EDX) and Hall Effect were used to determine the properties of the films. As a result of XRD analysis, it was observed that the films prepared with 0.5 M TSC were formed in amorphous structure, while the films prepared with 1 M and 1.5 M TSC were formed in polycrystalline structure and hexagonal phase. In addition, it was determined that the crystallization of the films increased with the increase in the molarity of TSC. The optical gaps of the films were determined as 3.77 eV, 3.44 eV and 3.40 eV, respectively, depending on the increase in molarity of TSC. The refractive index values of the MnS films in the visible region (400-700 nm) were calculated as 1.87, 2.02 and 2.10, respectively. Electrical resistivity and mobility values from Hall Effect measurements were measured as 1.01 x 10(6), 9.68 x 10(5), 4.10 x 10(5) ohm cm and 33.01, 36.93, 56.53 cm(2)/Vs, respectively, depending on the increase in TSC molarity value.