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Öğe Donor-acceptor heterojunction solar cells based on perylene dimide and perylene bisbenzimidazole(Cambridge Univ Press, 2006) Erten, S.; Meghdadi, F.; Gunes, S.; Koeppe, R.; Sariciftci, N. S.; Icli, S.We have fabricated heterojunction solar cells comprising active layers of perylene diimide (PDI) or perylene bisbenzimidazole (CONPER, conjugated perylene dye) as electron acceptor and ZnPC as donor. Bilayer solar cells were produced by successive evaporation of zinc phthalocyanine (ZnPC) and perylene diimide (PDI) or perylene bisbenzimidazole (CONPER) on glass substrates coated with indium doped tin oxide. Active layers with different thickness were evaporated. The bilayer cells were characterized under simulated AM 1.5 illumination (100 mW/cm(2)). The best results were obtained for the device structure of ITO/PEDOT/ZnPC (40 nm)/perylene bisbenzimidazole (60 nm)/Al (70 nm).Öğe Dye sensitized solar cell based on 1,8-naphthalene benzimidazole comprising carboxyl group(Edp Sciences S A, 2007) Erten, S.; Eren, E.; Icli, S.We report the characterization of 1,8-naphtha naphthalene benzimidazole comprising carboxyl group.We have fabricated dye-sensitized nanocrystalline TiO2 solar cell (DSSC) based on naphthalene benzimidazole dye. The device structure is FTO/nc-TiO2/Dye/I-/I-3(-)/Pt/ FTO. We calculated the E-HOMO and E-LUMO levels of this new dye by using cyclic voltammetry measurement. The E-LUMO level of naphthalene benzimidazole is 3.2 eV. This value is higher than the conduction band of TiO2. Electrons can be injected to the conduction band of TiO2. The current-voltage (I-V) characteristic of cell was measured under simulated AM 1.5 illumination (100 mW/cm(2)). We obtained the open circuit voltage; V-oc = 0.344 V, short circuit current density; I-sc = 5.93 mA cm(-2), filling factor; FF = 0.45, power conversion efficiency; eta = 0.91%.Öğe Functionalized bay-substituted perylene diimide additives for inverted organic photovoltaic devices based on P3HT/PCBM(Natl Inst Optoelectronics, 2015) Dincalp, H.; Cimen, O.; Saltan, G. Murat; Icli, S.The photovoltaic performances of inverted organic solar cells including P3HT:PCBM active layer with perylene diimides (PDIs) substituted with different subunits at bay positions of perylene ring were investigated. The improvement of photoluminescence intensity for P3HT:PCBM blend was achieved by the increase of PDI1 additive amount from 6.6 to 10 wt%. In P3HT:PDI1 :PCBM ternary blend, preliminary results obtained from cell measurements indicated that PDI1 dopant has improved the cell efficiency by 38% compared to the control cell. Carrier mobility studies revealed that electron or hole mobility capacities of the perylene additives in ternary blends gave a more detailed explanation for efficiencies both binary and ternary systems.Öğe Functionalized bay-substituted perylene diimide additives for inverted organic photovoltaic devices based on P3HT/PCBM(Natl Inst Optoelectronics, 2015) Dincalp, H.; Cimen, O.; Saltan, G. Murat; Icli, S.The photovoltaic performances of inverted organic solar cells including P3HT:PCBM active layer with perylene diimides (PDIs) substituted with different subunits at bay positions of perylene ring were investigated. The improvement of photoluminescence intensity for P3HT:PCBM blend was achieved by the increase of PDI1 additive amount from 6.6 to 10 wt%. In P3HT:PDI1 :PCBM ternary blend, preliminary results obtained from cell measurements indicated that PDI1 dopant has improved the cell efficiency by 38% compared to the control cell. Carrier mobility studies revealed that electron or hole mobility capacities of the perylene additives in ternary blends gave a more detailed explanation for efficiencies both binary and ternary systems.Öğe Functionalized bay-substituted perylene diimide additives for inverted organic photovoltaic devices based on P3HT/PCBM(Natl Inst Optoelectronics, 2015) Dincalp, H.; Cimen, O.; Saltan, G. Murat; Icli, S.The photovoltaic performances of inverted organic solar cells including P3HT:PCBM active layer with perylene diimides (PDIs) substituted with different subunits at bay positions of perylene ring were investigated. The improvement of photoluminescence intensity for P3HT:PCBM blend was achieved by the increase of PDI1 additive amount from 6.6 to 10 wt%. In P3HT:PDI1 :PCBM ternary blend, preliminary results obtained from cell measurements indicated that PDI1 dopant has improved the cell efficiency by 38% compared to the control cell. Carrier mobility studies revealed that electron or hole mobility capacities of the perylene additives in ternary blends gave a more detailed explanation for efficiencies both binary and ternary systems.Öğe Investigation of the Electrical Parameters of the Organic Diode Modified with 4-[(3-Methylphenyl)(phenyl)amino] Benzoic Acid(Electrochemical Soc Inc, 2016) Havare, A. Kemal; Can, M.; Yagmurcukardes, N.; Yigit, M. Z.; Aydin, H.; Okur, S.; Demic, S.; Icli, S.4-[(3-Methylphenyl)(phenyl)amino]benzoic acid (MPPBA) self-assembled monolayer (SAM) molecules as hole injection is formed on p and n type Si and on indium-tin oxide (ITO) electrodes to investigate the effect on the electrical parameters of hole only organic device. The hole mobility improvement of organic device was attributed to an intermediate energy level formed between hole transport materials (HTL) (N,N'-Bis(naphthalen-1-yl)-N,N'-bis(phenyl)benzidine -NPB) and ITO when forming an ultrathin MPPBA layer, leading to increase of carrier mobility of the device. Space charge limited current (SCLC) technique is used to estimate the mobility of the NPB formed at the interface metal/organic Ohmic contact. The hole mobility of ITO/NPB/Al and ITO/MPPBA/NPB/Al devices were obtained as 1.80 x 10(-6) and 1.76 x 10(-3) cm(2)/Vs, at 1350 E (V/cm)(1/2) applied electric field, respectively. SAM modified devices has lower barrier height values. The electronic characteristic parameters of the ITO/(with or without MPPBA)/NPB/Al, Au/n-Si(or p-Si)/(with or without MPPBA)/Au contacts were calculated using current-voltage (I-V) measurements by Schottky type carrier injection. (C) The Author(s) 2016. Published by ECS.Öğe Lightning Protection for Buildings Energized by Renewable Energy Sources(Kaunas Univ Technology, 2011) Cetin, E.; Yilanci, A.; Ozturk, H. K.; Uckan, G.; Hekim, M.; Colak, M.; Icli, S.Renewable energy systems are of importance as being modular, nature-friendly and domestic. Among the renewable energy systems, a great deal of research has been conducted especially on photovoltaic, wind energy and fuel cell in the recent years. One of the hybrid renewable energy systems consisting of 5 kWp photovoltaic panels, 800 Wp wind turbines and 2.4 kWp fuel cell modules was installed at Clean Energy House (CEH), Pamukkale University in Denizli, Turkey. To protect this laboratory, a "Lightning Protection System" was installed at the CEH. In this study, design and installation processes of a lightning protection system for the hybrid renewable energy system at the CEH are considered. III. 7, bibl. 15 (in English; abstracts in English and Lithuanian).Öğe Morphological characterizations of ZnO nanostructures synthesized by hydrothermal method(Natl Inst Optoelectronics, 2009) Erten-Ela, S.; Cogal, S.; Icli, S.An efficient hydrothermal method is presented to synthesize ZnO nanostructures. We investigated the effects of reaction conditions by adjusting the amounts of NaOH, growth temperature, surfactant, annealing to control the morphologies of ZnO nanostructures. Critical amount of NaOH in our reaction system has great influence on the formation of ZnO nanorods. The diameter of ZnO nanocrystals decreased with growth temperature and morphology changed from nanorods to flowers when PEG400 was added to the solution.Öğe Preliminary tests of the radiopharmaceutical potential of N-(2,6-diisopropylphenyl)-N'-(4-pyridyl)-perylene-3,4,9,10-tetracarboxylic diimide radiolabeled with I-131(Springer, 2007) Avcibasi, U.; Dincalp, H.; Uenak, T.; Yildirim, Y.; Avcibasi, N.; Duman, Y.; Icli, S.Perylene diimide derivatives are one of the G-quadruplex DNA interactive agents which are thought to be useful in application of cancer treatment Starting from this consideration, N-(2,6-diisopropylphenyl)-N'-(4-pyridyl)-perylene-3,4,9,10-tetracarboxylic diimide (PYPER) was synthesized, radioiodinated with I-131, and its radiopharmaceutical potentials were tested on a male Albino rabbit and male Albino Wistar rats. This compound was successfully radioiodinated with I-131 with a radioiodination yield of about 100%. Scintigraphic imaging with the radiiodinated compound (I-131-PYPER) was performed on a rabbit. Static images were obtained from posterior projection using a Diacan gamma camera at several time intervals. The scintigrams clearly showed that the radioiodinated compound was not quickly cleared from the metabolism, accumulating in the stomach over about 30 minutes. The clearance time of this compound was considerably longer than 5 hours. The results obtained in this study agreed with that of the biodistribution studies and indicated that I-131-PYPER might be used as a scintigraphic agent for examining stomach diseases.Öğe Role of side groups in pyridine and bipyridine ruthenium dye complexes for modulated surface photovoltage in nanoporous TiO2(Elsevier Science Bv, 2010) Sahin, C.; Dittrich, Th.; Varlikli, C.; Icli, S.; Lux-Steiner, M. Ch.The influence of molecular side groups on the electron backtransfer into ruthenium-dye molecules adsorbed on ultra-thin nanoporous TiO2 layers has been investigated by modulated surface photovoltage spectroscopy in argon atmosphere. All ruthenium-dye molecules contained one bipyridine (bpy) ligand with two carboxylic groups for anchoring at the TiO2 surface. Ruthenium (II) complexes with a second bpy ligand with branching and non-branching side groups containing C and H only and ruthenium (II) complexes with a second pyridine (py) ligand with side groups containing different numbers of -C-O-C- sequences were synthesized. The electron backtransfer was practically not affected by branching or non-branching side groups in the bpy-bpy complexes. In contrast, electron backtransfer was much less for bpy-py complexes in comparison to bpy-bpy complexes and increased strongly with increasing number of -C-O-C- sequences in the side groups. (C) 2009 Elsevier B.V. All rights reserved.Öğe Soluble derivatives of perylene and naphthalene diimide for n-channel organic field-effect transistors(Elsevier Science Bv, 2006) Singh, Th. B.; Erten, S.; Guenes, S.; Zafer, C.; Turkmen, G.; Kuban, B.; Teoman, Y.; Sariciftci, N. S.; Icli, S.Solution-processed n-type organic field-effect transistors (OFETs) have been fabricated using soluble derivatives of perylene diimide and naphthalene diimide. We report the synthesis of the organic semiconductors and the fabrication of bottom gate OFET devices using solution-processed organic dielectrics. Surface morphology studies reveal films with layered textures and liquid crystalline-like structure. Devices show field-effect electron mobilities of 10(-2) cm(2)/V s and 10(-3) cm(2)/V s for N,N'-bis-n-butyl-1,4,5,8-naphthalenediimide-NDI under inert conditions and in air, respectively. N,N'-bis-(1-pentyl)hexyl-3,4,9,10-perylene diimide-PDI-4 shows mobility of 5 x 10(-4) cm(2)/V s. Organic field-effect transistors based on N,N'-bis(dehydroabietyl)-3,4,9,10-perylene diimide-PDI-1 derivative exhibit ambipolar transport. (c) 2006 Elsevier B.V. All rights reserved.Öğe Spectrophotochemical and electrochemical characterization of perylene derivatives adsorbed on nanoporous metaloxide films(Edp Sciences S A, 2007) Kus, M.; Demic, S.; Zafer, C.; Saygili, G.; Bilgili, H.; Icli, S.Electrochemistry of perylene imide and anhydride derivatives adsorbed on semiconductor TiO2 (NT) and insulator Al2O3 (NA) metal oxide films were presented. Adsorption rates on metal oxide surface are observed to be strongly depending on molecular structure. Monoanhydride-monoimide derivatives show two reversible reductions in solution and one reversible reduction in films. Color change from red to blue and violet is observed indicating the formation of monoanion and dianion radicals. Spectroelectrochemical measurements support this interpretation. The color reversal is quite stable in NA films in comparison with NT films.Öğe Structural and Vibrational Spectroscopy Investigation of the 5-[(diphenyl) amino] Isophthalic Acid Molecule(Amer Inst Physics, 2014) Kurt, M.; Sas, E. Babur; Can, M.; Okur, S.; Icli, S.; Demic, S.; Simos, TE; Kalogiratou, Z; Monovasilis, TThe molecular structure and vibrations of 5-(diphenyl) amino] isophthalic acid (DPIFA) were investigated by different spectroscopic techniques (such as infrared and Raman). FT-IR, FT-Raman and dispersive Raman spectra were recorded in the solid phase. HOMO-LUMO analyses were performed. The theoretical calculations for the molecular structure and spectroscopic studies were performed with DFT (B3LYP) and 6-311G (d,p) basis set calculations using the Gaussian 09 program. After optimizing the geometry of the molecule, vibration wavenumbers and fundamental vibrations wavenumbers were assigned on the basis of the potential energy distribution (PED) of the vibrational modes calculated with VEDA 4 program. The results of theoretical calculations for the spectra of the title compound were compared with the observed spectra.Öğe Structural investigation of a self-assembled monolayer material 5-[(3-methylphenyl) (phenyl) amino] isophthalic acid for organic light-emitting devices(Pergamon-Elsevier Science Ltd, 2014) Sas, E. Babur; Kurt, M.; Can, M.; Okur, S.; Icli, S.; Demic, S.The molecular structure and vibrations of 5-[(3-methylphenyl) (phenyl) amino] isophthalic acid (MePIFA) were investigated by infrared and Raman spectroscopies, UV-Vis, H-1 and C-13 NMR spectroscopic techniques and NBO analysis. FT-IR, FT-Raman and dispersive Raman spectra were recorded in the solid phase. H-1 and C-13 NMR spectra and UV-Vis spectrum were recorded in DMSO solution. HOMO-LUMO analysis and molecular electrostatic potential (MEP) analysis were performed. The theoretical calculations for the molecular structure and spectroscopies were performed with DFT (B3LYP) and 6-311G(d,p) basis set calculations using the Gaussian 09 program. After the geometry of the molecule was optimized, vibration wavenumbers and fundamental vibration wavenumbers were assigned on the basis of the potential energy distribution (PED) of the vibrational modes calculated with VEDA 4 program. The total (TDOS), partial (PDOS) density of state and overlap population density of state (OPDOS) diagrams analysis were made using GaussSum 2.2 program. The results of theoretical calculations for the spectra of the title compound were compared with the observed spectra. (C) 2014 Elsevier B.V. All rights reserved.Öğe Synthesis and spectroscopic characterization on 4-(2,5-di-2-thienyl-1H-pyrrol-1-yl) benzoic acid: A DFT approach(Pergamon-Elsevier Science Ltd, 2016) Kurt, M.; Sas, E. Babur; Can, M.; Okur, S.; Icli, S.; Demic, S.; Karabacak, M.; Jayavarthanan, T.; Sundaraganesan, N.A complete structural and vibrational analysis of the 4-(2,5-di-2-thienyl-1H-pyrrol-1-yl) benzoic acid (TPBA), was carried out by ab initio calculations, at the density functional theory (DFT) method. Molecular geometry, vibrational wavenumbers and gauge including atomic orbital (CIAO) C-13 NMR and H-1 NMR chemical shift values of (TPBA), in the ground state have been calculated by using ab initio density functional theory (DFT/B3LYP) method with 6-311G(d,p) as basis set for the first time. Comparison of the observed fundamental vibrational modes of (TPBA) and calculated results by DFT/B3LYP method indicates that B3LYP level of theory giving yield good results for quantum chemical studies. Vibrational wavenumbers obtained by the DFT/B3LYP method are in good agreement with the experimental data. The study was complemented with a natural bond orbital (NBO) analysis, to evaluate the significance of hyperconjugative interactions and electrostatic effects on such molecular structure. By using TD-DFF method, electronic absorption spectra of the title compound have been predicted and a good agreement with the TD-DFF method and the experimental one is determined. In addition, the molecular electrostatic potential (MEP), frontier molecular orbitals analysis and thermodynamic properties of TPBA were investigated using theoretical calculations. (C) 2015 Elsevier B.V. All rights reserved.Öğe Synthesis of two tri-arylamine derivatives as sensitizers in dye-sensitized solar cells: Electron injection studies and photovoltaic characterization(Elsevier Science Sa, 2014) Can, M.; Yigit, M. Z.; Seintis, K.; Karageorgopoulos, D.; Demic, S.; Icli, S.; Giannetas, V.; Fakis, M.; Stathatos, E.Two organic sensitizers with the structure donor-pi-acceptor, having tri-arylamine as electron donor, cyano-acetic acid as electron acceptor and a phenyl or thiophene ring as pi-bridge, are synthesized. The synthetic procedure, the photophysical and electrochemical properties of both dyes are described in detail. In particular, cyclic voltammetry and spectroscopic measurements were performed while the energy gap between highest occupied and lowest unoccupied molecular orbital for both dyes was calculated. Besides, electron injection dynamics on a series of titanium dioxide nanostructured films sensitized with the two dyes were investigated with time resolved fluorescence spectroscopy using femtosecond temporal resolution, while nanostructured alumina films were used as reference. The photovoltaic performances of both dyes in quasi-solid state dye sensitized solar cells were also investigated. A maximum overall conversion efficiency of 3.8% was monitored for two micrometer thin titanium dioxide films and quasi-solid state electrolyte. The performances of the solar cells are explained in terms of photophysical properties and electron injection dynamics of both dyes. (C) 2013 Elsevier B.V. All rights reserved.
