Synthesis of benzimidazole moiety heteroleptic ruthenium complex and use as sensitizer in dye-sensitized solar cells

The new benzimidazole functional heteroleptic ruthenium complex dye (BRD) was prepared for dye-sensitized solar cells (DSSCs). The compound was identified by various spectroscopic techniques and photovoltaic performances of this BRD DSSC were investigated and compared with Z907 (cis-diisothiocyanato-(2,2 '-bipyridyl-4,4 '-dicarboxylic acid)-(2,2 '-bipyridyl-4,4 '-dinonyl) ruthenium(II)) DSSCs. It was found that [Ruthenium (4,4 '-dicarboxylic acid-2,2 '-bipyridine) (1-(2-ethoxyethyl)-2-(pyridine-2-yl)benzimidazole) (NCS)(2)] (2) has a thermal stability below 300 degrees C. Two different electrolytes were used to get the effect on photovoltaic parameters. The photovoltaic measurements of the BRD and Z907 DSSCs were carried out under 100 mW/cm(2) (AM1.5) illumination. Short-circuit current density (J(sc)) values were obtained as 8.20 and 7.32 mA/cm(2) for AN50 and HI30 electrolytes, respectively. The photovoltaic efficiencies were obtained as 3.03% and 2.82% for AN50 and HI30 electrolytes, respectively.Duzce University Research FundDuzce University [2019.05.02.1026, 2020.05.02.1136, 2020.05.03.1143]This work is supported by Duzce University Research Fund Project Numbers: 2019.05.02.1026, 2020.05.02.1136, 2020.05.03.1143.WOS:0007188513000032-s2.0-8511905044

Electrical property investigation of the Au/n-Si and Au/PVA plus benzimidazole Co complex/n-Si diodes under ultraviolet illumination

Polyvinyl alcohol (PVA) was doped using the di[1-(2-ethoxyethyl)-5-nitrobenzimidazole] cobalt dichloride and this polymeric composite was used as an interface in Au/n-Si diodes. The basic electrical properties of these fabricated Au/n-Si (MS) and Au/PVA+Co complex/n-Si (MPS) diodes were examined measuring voltage-dependent current (I(V)) data in various ultraviolet illumination intensities and room temperature. Electrical parameters of the MS and MPS diodes were calculated by thermionic emission, Norde, and Card & Rhoderick method. It was found that the ideality factor (n) values of the MS diode increased from 6.7 to 13.4 while the MPS ones increased from 3.4 to 7.5 with increasing illumination. Also, the photo-responsivity (PR) of MPS diode was obtained for P = 50 mW/cm(2) (365 nm UV) as 0.29 A/W at - 5.00 V and 4.01 mA/W at 0 V.WOS:0006146762000012-s2.0-8510048053

Effect of the photoanode fabrication condition, electrolyte type and illumination type on dye-sensitized solar cells performance

The combination of the photoanode fabrication condition, electrolyte type and light source effect on dye-sensitized solar cell (DSSC) performance were investigated. Three different photoanodes (C-1, C-2 and C-3) were used with different fabrication conditions with two different redox concentration electrolytes (30 and 50 mM) for each photoanode. For these six different combinations, DSSC performances were obtained for 12 different situations using two different light sources, AM 1.5 simulated and ultraviolet (UV-365 nm) illumination. It was obtained that the HI30 electrolyte has higher efficiency for UV illumination and the AN50 electrolyte has higher efficiency for AM1.5 simulated illumination. It was also obtained that the C-2 cell with double layer immersed in dye solution has higher efficiency for both two illumination types and two electrolytes.Duzce University Scientific Research ProjectDuzce University [2019.05.02.1026]This study was supported by Duzce University Scientific Research Project (Project Number 2019.05.02.1026). Also we are thankful to Dr Abdullah Yldz and his research groups for experimental support.WOS:0006268259000012-s2.0-8510237638

Synthesis and characterization of novel benzimidazole cobalt and copper complexes and applying in Au/PVA/n-Si diode

A new stable solid di[1-(2-ethoxyethyl)-5-nitrobenzimidazole] cobalt dichloride (2) and di[1-(2-ethoxyethyl)-5nitrobenzimidazole] copper dichloride (3) were prepared by the combination of 1-(2-ethoxyethyl)-5-nitrobenzimidazole (1) with metal salts (CoCl2 center dot 6H(2)O and CuCl2 center dot H2O). Synthesized di[1-(2-ethoxyethyl)-5-nitrobenzimidazole] cobalt dichloride (2) and di[1-(2-ethoxyethyl)-5-nitrobenzimidazole] copper dichloride (3) were identified by H-1 NMR and C-13 NMR spectroscopic techniques and elemental analysis. Poly vinyl alcohol (PVA) polymer with and without novel benzimidazole cobalt and copper complexes dopant interfacial layers were used in Au/n-Si diodes. The basic electrical properties of these fabricated four diodes were examined using currentvoltage (I-V) measurements in dark and room temperature. The n and I0 values of all MPS diodes are smaller than the MS diode and the Phi(B0) values are greater.WOS:0005387908000032-s2.0-8508405401

High photo-responsivity Au/polyvinyl alcohol (PVA)+di[1-(2-ethoxyethyl)-5-nitrobenzimidazole] copper dichloride/n-Si UV photodiode

Au/n-Si metal/semiconductor (MS) type diode was transformed into a metal/polymer/semiconductor (MPS) type diode by polyvinyl alcohol (PVA)+benzimidazole Cu complex interfacial layer to achieve better photodiode properties. Au/PVA + benzimidazole Cu complex/n-Si MPS diode's electronic and photo-responsivity (PR) properties were investigated by current-voltage (I-V) measurements under various ultraviolet (UV) (365 nm wavelength) illumination intensities (from 50 to 250 mW/cm(2)) and at room temperature. It was found that the difference between the dark and high UV illumination I(V) plots of the MPS diode exceeds 10(5) times. Thus, this higher response to UV illumination has caused the reverse region current of the diode exceeds the forward region current since the first UV illumination level (50 mW/cm(2)). This ensures both the MPS diode has a very high PR value and allows that the diode working direction can be adjusted with UV exposure. The remarkably high PR values were obtained for P = 100 mW/cm(2) as 11.01 A/W at -4.84 V, and 2.14 mA/W at 0 V. Also, main electronic parameters of the MPS diode were calculated by thermionic emission, Ohm law, Cheung&Cheung and Card&Rhoderick methods. The series resistance (Rs) values calculated for each Cheung&Cheung function are compatible each other and there is an acceptable coherence with obtained values by ohmic approach. For the surface states density (N-ss) of the MPS diode obtained for each UV illumination, it was found that they are higher than the dark ones and they shifted to lower energy region. (c) 2020 Elsevier B.V. All rights reserved.WOS:0005882606000062-s2.0-8509191656

Annealing effects of photoanode on dye sensitized solar cell performance

Photoanode annealing effects on dye sensitized solar cell (DSSC) performance were investigated. Four different temperatures (300, 400, 500 and 600 degrees C) were used to annealing of the photoanodes. Morphologic properties of the photoanodes were investigated by a field emission scanning electron microscope (FESEM) and atomic force microscope (AFM). The photovoltaic properties of these DSSCs were obtained for these temperatures using a solar simulator for two different type electrolyte with different redox concentration and additive. Also, the series and charge transfer resistances were obtained from the electrochemical impedance spectroscopy (EIS) Nyquist plots of DSSCs.Duzce UniversityDuzce University [2020.05.02.1136, 2019.05.02.1026]This work is supported by Duzce University Research Fund Project Numbers: 2020.05.02.1136; 2019.05.02.1026.WOS:0006680128000012-s2.0-8511089566

Kronik tromboembolik pulmoner hipertansiyon tedavisinde çıtayı ultradisipliner iş birliğine yükseltmek

Chronic thromboembolic pulmonary hypertension is an underdiagnosed and potentially fatal subgroup of pulmonary hypertension, if left untreated. Clinical signs include exertional dyspnea and non-specific symptoms. Diagnosis requires multimodality imaging and heart catheterization. Pulmonary endarterectomy, an open heart surgery, is the gold standard treatment of choice in selected patients in specialized centers. Targeted medical therapy and balloon pulmonary angioplasty can be effective in high-risk patients with significant comorbidities, distal pulmonary vascular obstructions, or recurrent/persistent pulmonary hypertension after pulmonary endarterectomy. Currently, there is a limited number of data regarding novel coronavirus-2019 infection in patients with chronic thromboembolic pulmonary hypertension and the changing spectrum of the disease during the pandemic. Challenging times during this outbreak due to healthcare crisis and relatively higher case-fatality rates require convergence; that is an ultradisciplinary collaboration, which crosses disciplinary and sectorial boundaries to develop integrated knowledge and new paradigms. Management strategies for the new normal such as virtual care, preparedness for further threats, redesigned standards and working conditions, reevaluation of specific recommendations, and online collaborations for optimal decisions for chronic thromboembolic pulmonary hypertension patients may change the poor outcomes

Synthesis, characterization and antioxidant activity of new dibasic tridentate ligands: X-ray crystal structures of DMSO adducts of 1,3-dimethyl-5-acetyl-barbituric acid o-hydroxybenzoyl hydrazone copper(II) complex

o-Hydroxybenzoyl hydrazine and p-hydroxybenzoyl hydrazine react with 1,3-dimethyl-5-acetyl-barbituric acid in ethanol to give H2L1 (85% yield) and H2L2 (91% yield) respectively. The copper(II) complexes with DMSO adducts, [Cu(L-1)(DMSO)] and [Cu(L-2)(DMSO)], were prepared by the stoichiometric reaction of the CuCl2 center dot 5H(2)O with the H2L1 and H2L2 in a molar ratio (M:L) of 1:1 in DMSO/water mixture. All compounds have been fully characterized using conventional spectroscopic techniques. X-ray structure analysis was carried out on the [Cu(L-1)(DMSO)] which crystallizes in the triclinic P-1 space group. In addition, both ligands were applied several antioxidant assays including total antioxidant activity by phosphomolybdate, ferric reducing antioxidant power (FRAP) and scavenging activity on 1,1-diphenyl-2-picrylhydrazyl (DPPH). The results from antioxidant assays have shown that both ligands have excellent activities. (C) 2013 Elsevier B.V. All rights reserved