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    A novel photodiode based on Ruthenium(II) complex containing polydentate pyridine as photocatalyst
    (Pergamon-Elsevier Science Ltd, 2015) Soylu, M.; Orak, I.; Dayan, O.; Serbetci, Z.
    Ruthenium(II)-complex thin film, bearing pyridine-based tridentate was deposited on p-Si substrate by spin coating technique. The I-V measurements across the junction showed rectifying behavior. The reverse bias current of the heterojunction diode increased with increasing illumination intensity. The sensitivity to the light of I-V characteristics was attributed to the photocatalytic effect of Ruthenium(II)-complex. Ruthenium(II)complex thin film exhibited a transparency higher than 70% in the visible part of the spectrum. The band gap of Ruthenium(II)-complex film was calculated to be 4.42 eV. The reflectance data can be analyzed to determine optical constants such as refractive index and dielectric constant. The results indicate that Ruthenium(II)complex can be used in fabrication of high photosensitive diodes. (C) 2015 Elsevier Ltd. All rights reserved.
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    Copper(II) and cobalt(II) complexes of 2,6-diacetylpyridine bis(O-methyloxime): A theoretical investigation
    (Pleiades Publishing Inc, 2012) Ozdemir, N.; Dayan, O.; Dincer, M.; Cetinkaya, B.
    The molecular geometries and vibrational frequencies of the title compounds in the ground state are calculated using the Hartree-Fock (HF) and density functional theory (DFT/B3LYP) methods with the LANL2DZ basis set and compared with the experimental data. The calculated results show that the optimized geometries can well reproduce the crystal structural parameters, and the theoretical vibrational frequencies show good agreement with the experimental values. The energetic behavior of the title compounds in solvent media is examined using the B3LYP method with the LANL2DZ basis set by applying the Onsager and polarizable continuum model (PCM). In addition, molecular electrostatic potential (MEP) and frontier molecular orbital (FMO) analyses of the title compounds are investigated by theoretical calculations.
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    Heteroleptic neutral Ru(II) complexes based photodiodes
    (Elsevier Science Bv, 2017) Elgazzar, Elsayed; Dayan, O.; Serbetci, Z.; Dere, A.; Al-Sehemi, Abdullah G.; Al-Ghamdi, Ahmed A.; El-Tantawy, Farid
    The two complexes Ru(II) containing 2,6-bis(benzimidazol-2-yl) pyridine and 2-pyridine and 2-quinoline carboxylates were synthesized to fabricate organic photodiodes. The electrical properties of Au/Ru(II) complex (I)/n - Si/Al and Au/Ru(II) complex (II)/n - Si/Al diodes were investigated by current-voltage and capacitance-voltage measurements. The fabricated devices give a high rectification behavior with rectification ratio of 2.4 x10(4) - 2.1 x10(3) at +/- 4 V. The diodes exhibited a high photoconductivity based on trap levels within band gap. The series resistance and barrier height were calculated from (C - V) measurements and compared to other of (I - V). The obtained results indicate that the prepared photodiodes can be used as photosensor for optoelectronic applications.
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    Photoelectrical characteristics of novel Ru(II) complexes based photodiode
    (Springer, 2019) Farooq, W. A.; Elgazzar, Elsayed; Dere, A.; Dayan, O.; Serbetci, Z.; Karabulut, Abdulkerim; Atif, M.
    The Ru(II) complex was prepared by the reaction of 4-chloro-N-[(E)-(pyridin-2-yl) methylidene] benzene-1-sulfonamide, [RuCl2(p-cymene)](2) and 2,2-(pyridine-2,6-diyl) bis(1H-benzimidazole) compounds by simple chemical technique. Al/ruthenium(II) complex/p-Si/Al was characterized by electronic devices and its electrical properties were studied as photodiode. In dark, the photodiode parameters such as potential barrier phi and ideality factor n were investigated from current-voltage (I-V) plot and confirmed by using Cheung-Cheung and Norde's models. Under illumination effect, the synthesized device shows high photosensitivity and the charge carriers increased based on the trapped state created under the conduction band. It was observed from conductance-voltage (G-V) and resistance-voltage (R-s-V) measurements that the series resistance Rs of the diode is decreased dramatically and its conductance G is increased by applied electric field.
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    Ruthenium(II) Complex Based Photodiode for Organic Electronic Applications
    (Springer, 2018) Tataroglu, A.; Ocaya, R.; Dere, A.; Dayan, O.; Serbetci, Z.; Al-Sehemi, Abdullah G.; Soylu, M.
    In this study, the electrical and photoresponse properties of a photovoltaic device with Ruthenium(II) complex interfacial thin film were investigated. Heteroleptic Ru(II) complex including bidentate and tridentate ligands thin film was coated on n-Si substrate by the spin coating technique. From current-voltage (I-V) measurements of an Au/Ru(II)/n-Si photodiode, it is observed that the reverse bias current under light is higher than that of the current in the dark. This indicates that the photodiode exhibits a photoconducting characteristic. The transient measurements such as photocurrent, photocapacitance and photoconductance were performed under various illumination conditions. These measurements indicate that the photodiode has a high photoresponsivity. The electrical parameters such as barrier height (I broken vertical bar(b)), ideality factor (n) and series resistance (R (s)) of the photodiode were determined from the analysis of I-V characteristics. Moreover, the capacitance/conductance-voltage characteristics of the photodiode highly depend on both voltage and frequency. Results show that the heterojunction can be used for various optoelectronic applications.
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    Single crystal ruthenium(II) complex dye based photodiode
    (Elsevier Sci Ltd, 2016) Tataroglu, A.; Dayan, O.; Ozdemir, N.; Serbetci, Z.; A-Ghamdi, Ahmed A.; Dere, A.; El-Tantawy, Farid
    The electrical and photoresponse properties of Ruthenium(II) complex dye based on photodiode were analyzed by current, capacitance and conductance measurements performed in a wide illumination intensity and frequency range. It was observed that the reverse current increases with increasing illumination intensity. The results confirm that the photodiode exhibits a photoconducting behavior. Also, the transient photocurrent, photocapacitance and photoconductance of the photodiode were investigated as a function of time. It was observed that the values of these parameters increase after illuminating and reach back to original value after turning off the illumination. In addition, the interface states and series resistance of the photodiode were determined from capacitance/conductance voltage measurements. The value of these parameters decreases with increasing frequency. The obtained experimental results suggest that the photodiode with Ruthenium/Ru(II) complex thin film could be used in various optoelectronic devices and applications. (C) 2016 Elsevier Ltd. All rights reserved.
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    SYNTHESIS, SPECTROSCOPY, X-RAY CRYSTALLOGRAPHY, AND DFT CALCULATIONS OF (E)-4-{[(2-HYDROXYPHENYL) IMINO]METHYL}PHENYL BENZENESULFONATE
    (Pleiades Publishing Inc, 2020) Ozdemi, N.; Dayan, O.
    The title molecule is prepared by the Schiff base reaction. The structural properties of the compound are described using FTIR, H-1 and C-13 NMR, and absorption spectroscopies and single-crystal X-ray diffraction. Some quantum chemical calculations of the compound (molecular structure, vibrational wavenumbers and gauge including atomic orbital, H-1 and C-13 NMR chemical shifts) are executed using the density functional theory method at the B3LYP/6-311++G(d,p) level of theory. Additionally, electronic spectra of the compound are computed using the time-dependent density functional theory (TDDFT) method under the above conditions. A comparison of the experimental and theoretical findings reveals that a good correlation between them is acquired.
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    Thermal study of ruthenium(II) complexes containing pyridine-2,6-diimines
    (Springer, 2008) Dogan, F.; Dayan, O.; Yurekli, M.; Cetinkaya, B.
    Thermal behaviors of mono- and binuclear Ru(II)-pydim complexes: [PydimCl(2)RuL] (Pydim: pyridine-2,6-diimine; 2: L=NCMe; 3: L=PPh3) and [PydiMCl(2)Ru(L-L)RuCl(2)Pydim] (4: L-L=pyrazine; 5: L-L=4,4'-bipyridine) have been studied in nitrogen atmosphere using TG/DTG and DTA techniques. The decompositions of complexes occur in stepwise. The values of activation energy, Ea, and reaction order, n of the thermal decomposition were calculated by means of several methods such as Coats-Redfern (CR), MacCallum-Tanner (MT), Horowitz-Metzger (HM), van Krevelen (vK), Madhusudanan-Krishnan-Ninan (MKN) and Wanjun-Yuwen-Hen-Cunxin (WYHC) based on the single beating rate. Most appropriate method was determined for each decomposition step according to the least-squares linear regression.