Browsing by Author "Ozkartal, Abdullah"

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Characterization of Cuo/N-si Heterojunction Solar Cells Produced by Thermal Evaporation
(Sciendo, 2018) Ozmentes, Resit; Temirci, Cabir; Ozkartal, Abdullah; Ejderha, Kadir; Yildirim, Nezir
Copper(II) oxide (CuO) in powder form was evaporated thermally on the front surface of an n-Si (1 0 0) single crystal using a vacuum coating unit. Structural investigation of the deposited CuO film was made using X- ray difraction (XRD) and energy dispersive X- ray analysis (EDX) techniques. It was determined from the obtained results that the copper oxide films exhibited single-phase CuO properties in a monoclinic crystal structure. Transmittance measurement of the CuO film was performed by a UV-Vis spectrophotometer. Band gap energy of the film was determined as 1.74 eV under indirect band gap assumption. Current-voltage (I-V) measurements of the CuO/n-Si heterojunctions were performed under illumination and in the dark to reveal the photovoltaic and electrical properties of the produced samples. From the I-V measurements, it was revealed that the CuO/n-Si heterojunctions produced by thermal evaporation exibit excellent rectifying properties in dark and photovoltaic properties under illumination. Conversion efficiencies of the CuO/n-Si solar cells are comparable to those of CuO/n-Si produced by other methods described in the literature.
Design of Novel Substituted Phthalocyanines; Synthesis and Fluorescence, Dft, Photovoltaic Properties
(Tubitak Scientific & Technological Research Council Turkey, 2020) Agirtas, Mehmet Salih; Solgun, Derya Gungordu; Yildiko, Umit; Ozkartal, Abdullah
The 4-(2[3,4-dimethoxyphenoxy] phenoxy) phthalonitrile was synthesized as the starting material of new syntheses. Zinc, copper, and cobalt phthalocyanines were achieved by reaction of starting compound with Zn(CH3 COO)(2), CuCl2, and CoCl2 metal salts. Basic spectroscopic methods such as nuclear magnetic resonance electronic absorption, mass and infrared spectrometry were used in the structural characterization of the compounds. Absorption, excitation, and emission measurements of the fluorescence zinc phthalocyanine compound were also investigated in THE. Then, structural, energy, and electronic properties for synthesized metallophthalocyanines were determined by quantum chemical calculations, including the DFT method. The bandgap of HOMO and LUMO was determined to be chemically active. Global reactivity (I, A, eta, s, mu, chi, omega) and nonlinear properties were studied. In addition, molecular electrostatic potential (MEP) maps were drawn to identify potential reactive regions of metallophthalocyanine (M-Pc) compounds. Photovoltaic performances of phthalocyanine compounds for dye sensitive solar cells were investigated. The solar conversion efficiency of DSSC based on copper, zinc, and cobalt phthalocyanine compounds was 1.69%, 1.35%, and 1.54%, respectively. The compounds have good solubility and show nonlinear optical properties. Zinc phthalocyanine gave fluorescence emission.
Effect of Silver Nanoparticles Prepared by Green Chemistry on the Photovoltaic Properties of Zinc Phthalocyanine
(Springer int Publ Ag, 2024) Odemis, Omer; Agirtas, Mehmet Salih; Solgun, Derya Gungordu; Ozkartal, Abdullah
The use of silver nanoparticles (AgNPs) produced from sustainable resources to improve photovoltaic properties of dye-sensitized solar cells is gaining interest due to the growing demand for clean and green energy sources. In this study, leaf (HY) and flower (HC) extracts of Golden Grass (Helichrysum italicum) were used to produce AgNPs with a low cost and easy method. The enhancement in power conversion efficiency by adding AgNPs phthalocyanine produced from biomaterials was investigated. The formation of AgNPs is indicated by a strong surface plasmon resonance (SPR) at 441 nm for HY-AgNPs and 448 nm for HC-AgNPs. Spherical AgNPs were formed with an estimated diameter of 22.59 +/- 0.71 nm for HY-AgNPs and 21.06 +/- 0.95 nm for HC-AgNs, both with a face center cubic crystal structure. On the other hand, the zinc phthalocyanine complex designed for dye-sensitized solar cells was synthesized and characterized. At the same time, the aggregation and fluorescence properties of zinc phthalocyanine were investigated. The photovoltaic properties of the phthalocyanine compound used in the study were examined without and with silver nanoparticle additives. With this doping, the power conversion efficiency percentage increased from 2.32 to 3.41 for HY-AgNPs and from 2.32 to 2.92 for HC-AgNPs. Evaluation of the results reveals that the phthalocyanine compound gains more efficient photovoltaic properties with the doping of AgNPs for dye-sensitized solar cells.
Photovoltaic Performance Properties, Dft Studies, and Synthesis of (e)-3 Acrylic Acid Substituted Phthalocyanine Complexes
(Springer int Publ Ag, 2021) Solgun, Derya Gungordu; Yildiko, Umit; Ozkartal, Abdullah; Agirtas, Mehmet Salih
In this study, firstly, a new phthalonitrile derivative was synthesized from the reaction of caffeic acid with phthalonitrile. Then, metal phthalocyanine complexes were obtained from the reaction of this phthalonitrile derivative with metal salts. Compounds were characterized by UV, NMR, IR and Mass spectroscopy methods. In addition, the fluorescence and electronic properties of the diamagnetic zinc phthalocyanine compound were investigated. The performances of dye-sensitized solar cells of compounds were examined. The calculated power conversion efficiencies (eta %) of the complexes using the obtained current density (J)-voltage (V) curves were determined that these compounds can be used as promising sensitizers in solar cell applications. The calculated power conversion efficiencies (% eta) of the complexes were found to be at a reasonable level. Molecular orbital properties such as HOMO-LUMO energy gap, Fermi Energies, state density spectrum, and molecular electrostatic potential surfaces were calculated for each phthalocyanine molecule. In addition, the amount of phthalocyanine required for ideal dye sensitivity was investigated.
Synthesis of (2-(4 Ethoxy)-Substituted Silicon Phthalocyanine and Novel Green Silver Nanoparticles: Dssc Targets
(Taylor & Francis inc, 2024) Agirtas, Mehmet Salih; Odemis, Omer; Ozkartal, Abdullah
In this study, designed as a dye-sensitive solar cell material which, bis-(2-(4-methylthiazol-5-yl) ethoxy) phthalocyaninato silicon (IV) compound (3) was obtained from the chemical reaction of SiPcCl2 and 4-methyl-5-thiazoleethanol. Silver nanoparticles (AgNPs) were synthesized using environmentally friendly and cost-effective green methods using leaf and flower extracts of Corydalis cava(CoV) and Nonea pulla(NP) plants. For the characterization of phthalocyanine compound and silver nanoparticles, Transmission electron microscopy (TEM), 1H NMR, 13C NMR, X-Ray Diffraction (XRD), UV-visible, FT-IR and Mass spectrum devices were used. The power conversion efficiency of without doping compound 3 is 1.20. After doping this compound with CoVAgNPs and NPAgNPs, the power conversion efficiencies increased to 1.74 and 2.10. From this it is clearly seen that silver nanoparticles are effective. It is concluded that better photovoltaic materials can be created by using phthalocyanine and silver nanoparticles together.
Synthesis of Phthalocyanine Complexes Carrying Caffeic Acid Groups: Increasing Photovoltaic Performance by Doping Silver Nanoparticles
(Taylor & Francis inc, 2023) Solgun, Derya Gungordu; Ozkartal, Abdullah; Agirtas, Mehmet Salih
Recently, phthalocyanines with carboxyl group have attracted attention for dye-sensitive solar cells. For this purpose, the caffeic acid unit was first reacted with phthalonitrile. Phthalocyanine complexes bearing carboxyl groups were obtained by reacting the synthesized phthalonitrile compound with different metal salts. The structures of the synthesized compounds were characterized using nukleer manyetik rezonans (NMR), UV-VIS Spektrofotometre(UV-Vis), Fourier-transform infrared spectroscopy (FTIR) and Mass spectroscopy (MS) methods. Fluorescence and aggregation properties were investigated. The efficiencies (%eta) of dye-sensitized solar cells are obtained by measurements of voltage (V) curves-current density (J). In this study, phthalocyanine compounds carrying carboxyl groups were used. Photovoltaic values were measured again by adding silver nanoparticles to the same compounds. It was observed that the power conversion efficiencies increased much more when the same compounds were doped with silver nanoparticles (AgNPs). This shows that the efficacy of phthalocyanine compounds for dye-sensitized solar cells can be significantly improved by AgNP doping. Power conversion efficiency was measured as 1.92, 2.11, and 2.20 for compounds 4,5 and 6, respectively, without doping to phthalocyanine compounds. Doping with silver nanoparticles showed an increase of 58%, 59%, and 56% for the same compounds, respectively. This shows that the power conversion effect of phthalocyanines can be made more efficiently with AgNPs doping.
Synthesis of Silver Nanoparticles Formed by Chaerophyllum Macrospermum and Eremurus Spectabilis Biomaterial and Investigation of Photovoltaic Parameters by Adding Silicon Phthalocyanine
(Taylor & Francis Ltd, 2023) Agirtas, Mehmet Salih; Odemis, Omer; Solgun, Derya Gungordu; Tanriverdi, Aslihan Aycan; Ozkartal, Abdullah
Silver nanoparticles (AgNPs) were obtained by green synthesis using Chaerophyllum macrospermum (CM) and Eremurus spectabilis (ES). These particles were characterized by TEM, XRD, IR, UV, mass, and NMR spectra. TEM images show that the mean particle size of CM-AgNPs was 30 nm and the diameter of ES-AgNPs was 14.2 nm. XRD measurements showed that CM-AgNPs were 30.85 nm and ES-AgNPs 18.80 nm in a perfect face-centered cubic crystal structure. CM-AgNP showed maximum absorption at 453 nm and ES-AgNP at 455 nm; AgNPs exhibited a strong surface plasmon resonance (SPR) and played a role in stabilization. A silicon phthalocyanine compound was synthesized and characterized. The photovoltaic properties of the axial phthalocyanine compound with and without doping of Chaerophyllum macrospermum and Eremurus spectabilis silver nanoparticles were investigated. Better dye-sensitive solar cells were formed by doping silver nanoparticles to phthalocyanine compounds with an increase in the percentage of energy conversion efficiency by 0.26 with ESAgNP doping and 0.76 with CMAgNP doping.