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    First principle calculations of structural, electronic, and optical properties of XSnO3 (X: Ca, Mg, Sr) perovskite oxides
    (Iop Publishing Ltd, 2025) Larbi, Rekia; Candan, Ilhan; Cakmak, Azad; Sahnoun, Omar; Sahnoun, Mohamed
    The perovskite oxides XSnO3 have garnered significant attention due to their potential applications in various fields, including electronics, photonics, and renewable energy technologies. This study presents a comprehensive theoretical investigation of the structural, electronic, and optical properties of XSnO3 (X: Ca, Mg, Sr) compounds with density functional theory based on the full potential linearized augmented plane wave method. Our analysis begins with thoroughly examining the structural stability and lattice parameters of XSnO3 compounds, revealing their robust perovskite crystal structures. These compounds' lattice constants, total energy, bulk modulus, and cohesive energy were determined. Subsequently, we delve into the electronic properties of XSnO3, elucidating their electronic band structures, density of states, and charge densities. The studied compounds are indirect bandgap semiconductors having band gaps in the visible range. Furthermore, our investigation extends to the optical properties of XSnO3, encompassing absorption spectra, refractive indices, energy loss function, reflectivity, extinction coefficient, and dielectric functions across a wide range of wavelengths. Overall, the excellent optical properties of these compounds make them suitable for optoelectronic applications.
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    Modeling of Ti doped CuO/ZnO/AZO thin film solar cell
    (Nova Science Publishers, Inc., 2024) Candan, Ilhan; Baturay, Silan; Gezgin, Serap Yigit; Kilic, Hamdi Sukur
    The CuO thin film in the IV group was grown on a glass substrate using a spin coating technique by doping 2% Ti. The optical properties of these films were characterized using ultraviolet-visible (UV-Vis) spectrophotometry. UV-Vis measurements show that the absorption and energy band gap value of Ti: CuO thin films change due to the different crystal structures of the films. Solar cells based on undoped CuO and Tidoped CuO thin films were modeled using the SCAPS-1D simulation program. Depending on the interface defect density, the values of photovoltaic parameters of the solar cells decreased. An increase in the efficiency of the Ti-doped CuO solar cell was observed with the increase in the hole mobility, but it showed lower performance compared to the undoped CuO solar cell. While the undoped CuO solar cell showed quantum efficiency in the narrow visible region close to the UV region, the Ti-doped CuO solar cell contributed to the quantum efficiency in the wider visible region. As a result of the calculations carried out with the simulation program, it was observed that the Ti atom caused a decrease in the efficiency of the CuO solar cell.. © 2024 Nova Science Publishers, Inc. All rights reserved.
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    Production of Cu2SnS3 thin films depending on the sulphur flow rate and annealing temperature time
    (Natl Inst Optoelectronics, 2023) Candan, Ilhan; Gezgin, Serap Yigit; Baturay, Silan; Kilic, Hamdi Sukur
    Cu2SnS3 thin films have been produced using spin coating method for 30 and 40 sccm sulphur flux rate during three annealing times of 15, 30 and 60 minutes at 550 degrees C. Crystal properties, morphological structure, phase structure, elemental contents and optical properties of Cu2SnS3 thin films have comprehensively been studied by XRD, SEM, Raman, EDX, UV-vis, and photoluminescence analysis, respectively. The crystalline size, dislocation density, microstrain and crystalline number of Cu2SnS3 thin films have been calculated. Cu2SnS3-A2 thin film annealed for 30 minutes has the best crystal structure. Cu2SnS3 thin films contain four different phases depending on sulphur flux rate and the annealing temperature duration. In addition, their band gaps, extinction coefficients and Urbach energies were determined. The refractive index and high frequency dielectric constant of Cu2SnS3 thin film were calculated using Herve and Vandamme, Moss and Ravindra relations and the values found were found to be compatible with one another. The skin depth and optical conductivity of Cu2SnS3 thin films were obtained. While the photon energy increased, their skin depth decreased and the optical conductivity considerably increased.
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    Sensor properties of plasmonic silver and gold nanoparticles produced by pulsed laser deposition
    (Natl Inst Optoelectronics, 2024) Candan, Ilhan; Gezgin, Serap yigit; Gumgum, Hadice budak; Kilic, Hamdi sukur
    In this study, 20-100 nm Au and Ag noble metal nanoparticles were produced using the Pulse Laser Deposition technique, and very sensitive optical properties of nanoparticles were investigated using the LSPR technique. The morphology of the produced nanoparticles was determined and characterized using scanning electron microscopy (SEM). The chemical bond structure of the Biotin molecule was investigated by Fourier Transform Infrared Spectroscopy (FTIR). In addition, the UV-Vis spectroscopy technique was used to determine LSPR absorption peaks of nanoparticles. Au and Ag Nanoparticles were deposited on the glass substrate depending on the laser deposition times. As the laser deposition time of the produced nanoparticles increased, both the size of the formed nanoparticles and the number of nanoparticles per unit surface increased. It was observed that the shape of Au and Ag nanoparticles produced based on SEM images was spherical. When UV-Vis spectra of Au and Ag nanoparticles were examined, it was observed that LSPR peaks shifted to longer wavelengths (redshift) as the laser deposition times increased. We have observed, to our knowledge, that the highest LSPR peak appeared at 1065 nm in the near-infrared region for plasmonic Au nanoparticles produced by Pulsed Laser Deposition. Once LSPR peaks of the plasmonic nanoparticles were characterized, Biotin molecules with different concentrations were attached to Ag and Au NPs to detect the sensor properties. LSPR peak shifts of bound nanoparticles could be observed and a blueshift of peaks was demonstrated as the concentration increased.