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C D Lokhande - One of the best experts on this subject based on the ideXlab platform.
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photoelectrochemical studies on electrodeposited indium doped cdse thin films using Aqueous Bath
Journal of Electroanalytical Chemistry, 2017Co-Authors: Vanita S Raut, C D Lokhande, Vilas V KilledarAbstract:Abstract Present investigation describes the photoelectrochemical studies of electrosynthesized CdSe and indium doped CdSe (In:CdSe) thin films deposited on stainless steel (SS) substrates. The photoelectrochemical (PEC) studies of both films are carried out with CdSe and In:CdSe(SS)/1 M Polysulfide/C cell. It is observed that indium doping in CdSe enhances the fill factor from 0.56 to 0.63 and photo-conversion efficiency from 0.80% to 2.01%. In order to study the consequence of doping, undoped and indium doped CdSe thin films are further characterized by capacitance-voltage, electrochemical impedance spectroscopy (EIS), spectral response, transient response, speed of response characterization techniques. By using capacitance-voltage measurement, various physical parameters are estimated and accordingly energy band diagrams have been constructed.
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a chemical method for the deposition of bi2s3 thin films from a non Aqueous Bath
Thin Solid Films, 2000Co-Authors: Rajaram S Mane, Babasaheb R Sankapal, C D LokhandeAbstract:A room temperature chemical method is developed to deposit semiconducting bismuth trisulphide thin films on glass substrates. The method is based on a non-Aqueous Bath containing bismuth nitrate and thioacetamide. The deposited films are characterized by X-ray diffraction, optical absorption, electrical resistivity and IR spectroscopy techniques. The effect of annealing on the structural, optical and electrical properties is studied.
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electrodeposition of cds from non Aqueous Bath
Materials Chemistry and Physics, 1997Co-Authors: S J Lade, C D LokhandeAbstract:Abstract CdS thin films have been prepared from non-Aqueous solvent using electrodeposition technique. Na 2 S 2 O 3 , CdSO 4 and EDTA (ethylene-diaminetetra-acetic acid tetrasodium salt) were dissolved in ethylene glycol (EG) and structural and optical properties of CdS films have been studied. The X-ray diffraction showed that CdS films are polycrystalline in nature, with single hexagonal phase. Optical absorption showed that bandgap of CdS is 2.45 eV.
C H Bhosale - One of the best experts on this subject based on the ideXlab platform.
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photoelectrochemical pec studies on cdse thin films electrodeposited from non Aqueous Bath on different substrates
Bulletin of Materials Science, 2007Co-Authors: Y G Gudage, N G Deshpande, Abhay A Sagade, Ramphal Sharma, S M Pawar, C H BhosaleAbstract:Thin films of CdSe were deposited by potentiostatic mode on different substrates such as stainless steel, titanium and fluorine tin-oxide (FTO) coated glass using non-Aqueous Bath. The preparative parameters were optimized to get good quality CdSe thin films. These films were characterized by X-ray diffraction (XRD), optical absorption and photoelectrochemical (PEC) techniques. XRD study revealed that the films were polycrystalline in nature with hexagonal phase. Optical absorption study showed that CdSe films were of direct band gap type semiconductor with a band gap energy of 1·8 eV. PEC study revealed that CdSe film deposited on FTO coated glass exhibited maximum values of fill factor (FF) and efficiency (η) as compared to the films deposited on stainless steel and titanium substrate.
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structural compositional and optical properties of electrochemically deposited stoichiometric cdse thin films from non Aqueous Bath
Solar Energy, 2006Co-Authors: A V Kokate, U B Suryavanshi, C H BhosaleAbstract:Abstract In the recent years, cadmium chalcogenide compounds have been extensively investigated because of their potential applications in solar energy conversion. Thin films of CdSe have been deposited onto the stainless steel and fluorine doped tin oxide (FTO) coated glass substrates using simple and inexpensive electrodeposition technique. The non-Aqueous solvent ethylene glycol (CH 2 OHCH 2 OH) containing precursors of Cd and Se with ethylenediaminetetraacetic acid (EDTA) tetra sodium salt as a complexing agent is used to obtain stoichiometric deposits. Deposition potential was estimated from polarization curves and other preparative parameters such as Bath temperature and concentration of solution were optimized. X-ray diffraction (XRD) analysis reveals that the films are polycrystalline with cubic structure. PEC study shows the CdSe films are photoactive. Optical absorption study shows the presence of direct transition with band gap energy 1.72 eV. The energy dispersive analysis by X-rays (EDAX) reveals that the substrate is well covered with large number of grains indicating compact structure. The average ratio of the atomic percentage of Cd:Se is 50.31:49.69, showing that the deposited films are almost stoichiometric.
Dhananjay Kumar Singh - One of the best experts on this subject based on the ideXlab platform.
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electrocodeposition and characterization of ni wc composite coating from non Aqueous Bath
International Journal of Materials Science and Applications, 2013Co-Authors: Dhananjay Kumar Singh, Manoj Tripathi, V B SinghAbstract:Composite coating of tungsten carbide (WC) in the matrix of nickel has been achieved by direct current (DC) electrodeposition technique using a non Aqueous Bath. The deposition parameters such as current density, Bath temperature, and stirring rate were maintained at constant levels for all the coating configurations. The composition of the coating and its microstructure were studied using energy dispersive x-ray spectroscopy, uv-vis spectrophotometry and x-ray diffraction, respectively. Surface morphology of the coatings was studied by scanning electron microscopy (SEM and TEM). Effect of heat treatment on the deposits microstructures and microhardness was also investigated. The Ni–WC composites, prepared at optimum conditions, exhibited improved mechanical properties in comparison to pure nickel electrodeposits.
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preparation of ni tic nanocomposites by electrolytic codeposition from a non Aqueous Bath and their characterization
Journal of The Electrochemical Society, 2012Co-Authors: Dhananjay Kumar Singh, Manoj Tripathi, Vijai Bahadur SinghAbstract:Electrodeposition provides a cost-effective means of producing fully dense nanocrystalline metals, alloys, and metal-matrix composites as coatings or freestanding forms (foil, sheet, wire, complex shapes). Fabrication of nanocomposite coating can be achieved by codeposition of nanometer-sized particles during electrodeposition of the matrix material. Since materials that can be electrodeposited include metals, alloys, oxides, semiconductors and electrically conducting polymers, this approach can be used to synthesize a wide range of nanocomposite materials. Electrodeposition of composite coatings, based on second phase hard particles dispersed in a metallic matrix, is gaining importance for potential engineering applications 1 such as wear-resistant coatings, 2‐4 corrosion-resistant coatings, 5 selflubricating films 6 and thermally graded structures. 7 TiC reinforced Cu and Fe based composites have been extensively used in electrical contacts, resistance welding electrodes and electrode for automatic welding. 8 Ni-TiC, finds their main use as cutting tools and in wear resistant applications because of their superior hardness and reasonable fracture toughness. Generally, hard metals are produced by conventionalsinteringmethodswhichareproductiveandproducefullydense parts. However, conventional techniques limit complexity in geometry. Therefore, a very economical and conventional technique is used here for the production of composites of scientific interest in the present investigation. Although TiC reinforced Ni metal matrix composites possess potential applications in cutting tools and as hard materials nevertheless less attention has been paid as very limited work has been reported 9‐12 on the electrodeposition of Ni-TiC. Moreover the nanocomposite of Ni-TiC has scarcely been reported. It is known that the properties of materials significantly change once the materials are transformed into nanomaterials. Therefore the present work focuses on this aspect in view of the interesting results obtained on metal matrix composites using micron sized particles. 13 It has been noticed that the electrodeposition of nano sized particles from Aqueous medium has limitation of agglomeration and low degree of incorporation due to surface hydrophobicity. 10 In an attempt to overcome these problems, in the present investigation an unconventional Bath (organic solvent) has been used. In view of the potential advantages offered by N-methylformamide i.e. very high dielectric constant which permits the highest probability of dissociation of electrolytes and its solubility, allowing high tolerance of electrolyte in the Bath, high boiling point with good chemical stability permitting wide temperature range for Bath operation and comparable viscosity and density to water; electrodeposition of metal matrix composites using N-methylformamide in conjunction with a common and cheap metal salt (nickel acetate) was undertaken for the first time in our laboratory
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electrodeposition of ni sic composite from a non Aqueous Bath
Journal of The Electrochemical Society, 2011Co-Authors: Dhananjay Kumar Singh, V B SinghAbstract:Electrodeposited Ni-SiC composite deposits with 10.5 wt % SiC were produced on copper substrate using a non-Aqueous organic solvent. N-Methylformamide was found to be the most suitable solvent as it has a high dielectric constant (182) that allows high tolerance of the electrolyte in the Bath, which is ordinarily not obtained in other solvents. The optimum condition arrived for deposition was nickel acetate 200 g/l, boric acid 35 g/l, SiC 10 g/l, current density 2.0 A dm -2 , duration of electrolysis 30 min, and Bath temperature 60°C. Satisfactory bright composite deposits were obtained, which were quite adherent to the copper base. Scanning electron microscope, energy-dispersive analysis by x ray, and X-ray diffraction studies have been performed to characterize the composites. Effect of current density on composition and microhardness of the composite deposits was investigated. Also, the effect of annealing on the microhardness of the deposits was studied.
V B Singh - One of the best experts on this subject based on the ideXlab platform.
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electrocodeposition and characterization of ni wc composite coating from non Aqueous Bath
International Journal of Materials Science and Applications, 2013Co-Authors: Dhananjay Kumar Singh, Manoj Tripathi, V B SinghAbstract:Composite coating of tungsten carbide (WC) in the matrix of nickel has been achieved by direct current (DC) electrodeposition technique using a non Aqueous Bath. The deposition parameters such as current density, Bath temperature, and stirring rate were maintained at constant levels for all the coating configurations. The composition of the coating and its microstructure were studied using energy dispersive x-ray spectroscopy, uv-vis spectrophotometry and x-ray diffraction, respectively. Surface morphology of the coatings was studied by scanning electron microscopy (SEM and TEM). Effect of heat treatment on the deposits microstructures and microhardness was also investigated. The Ni–WC composites, prepared at optimum conditions, exhibited improved mechanical properties in comparison to pure nickel electrodeposits.
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electrodeposition of ni sic composite from a non Aqueous Bath
Journal of The Electrochemical Society, 2011Co-Authors: Dhananjay Kumar Singh, V B SinghAbstract:Electrodeposited Ni-SiC composite deposits with 10.5 wt % SiC were produced on copper substrate using a non-Aqueous organic solvent. N-Methylformamide was found to be the most suitable solvent as it has a high dielectric constant (182) that allows high tolerance of the electrolyte in the Bath, which is ordinarily not obtained in other solvents. The optimum condition arrived for deposition was nickel acetate 200 g/l, boric acid 35 g/l, SiC 10 g/l, current density 2.0 A dm -2 , duration of electrolysis 30 min, and Bath temperature 60°C. Satisfactory bright composite deposits were obtained, which were quite adherent to the copper base. Scanning electron microscope, energy-dispersive analysis by x ray, and X-ray diffraction studies have been performed to characterize the composites. Effect of current density on composition and microhardness of the composite deposits was investigated. Also, the effect of annealing on the microhardness of the deposits was studied.
N B Chaure - One of the best experts on this subject based on the ideXlab platform.
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investigation of the effect of annealing conditions on electrodeposited cdte thin films from non Aqueous Bath
Applied Physics A, 2021Co-Authors: Dipmala P Sali, N B ChaureAbstract:We have investigated the effect of annealing conditions onto the cadmium telluride (CdTe) layers obtained using potentiostatic electrodeposition from non-Aqueous electrolyte. A conventional three-electrode geometry consisting; working (FTO), counter (Platinum) and reference (Ag/AgCl) electrodes were employed. The samples electrodeposited at − 0.625 V were annealed at 420 °C and cooled down with different procedures. The samples were characterized to study the structural, optical, morphological, compositional and transport properties. Quenched sample is found better as compared to naturally cooled and as-deposited samples. Growth of cubic polycrystalline crystal structure with improved crystallinity of CdTe is revealed from annealed samples. Highly stoichiometric CdTe layers with densely packed globular surface morphology of particle size ~ 2 μm obtained upon annealing the samples is proposed to be suitable for high efficiency thin film solar cells (TFSCs). The micro-structural Raman analysis supports the increased crystallinity and stoichiometric growth of sample after annealing. Highly ohmic behavior with higher carrier concentration and ideality factor measured for quenched samples is reported to be associated to sink in grain boundaries due to grain growth results the densification of sample leads to less defective layers. The results imply that annealing conditions have significant impact on the properties of CdTe samples and the quenched films may be most appropriate as an absorber layer for TFSC applications.
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cuinse2 thin film solar cells prepared by low cost electrodeposition techniques from a non Aqueous Bath
RSC Advances, 2015Co-Authors: Priyanka U Londhe, Ashwini B Rohom, N B ChaureAbstract:Polycrystalline CuInSe2 (CIS) thin films have been prepared by low-cost electrochemical method from non-Aqueous ethylene glycol solvent onto cadmium sulfide (CdS) thin films. The co-deposition potential for Cu, In and Se was optimized with cyclic voltammetry measurements. CIS layers were electrodeposited at −1.1, −1.3 and −1.5 V versus Ag/AgCl references in an air-tight custom made electrodeposition cell. The films were selenized at 400 °C for 20 minutes. The optical, structural, morphological, compositional and optoelectronic properties of as-prepared and selenized samples were studied using UV-Vis spectrophotometery, X-ray diffractometery, transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX) and current–voltage (I–V) measurements. Three prominent sharp peaks of tetragonal CIS, (112), (204)/(220), and (312/116) were revealed in all as-prepared and selenized samples. Upon selenization the crystallinity of the samples was found to be improved remarkably. Compact, void free, and nearly uniform thin films of grain size ∼1 μm were deposited. The as-deposited and selenized CIS samples were Cu-rich whereas the content of Se was ∼50% obtained by EDAX analysis. The value of inter-planer distance, d = 3.339 A, measured by HRTEM corresponds to the (112) plane of a tetragonal CIS crystal structure. The circular spotted rings observed in the selected area diffraction (SAD) pattern were confirmed as (112), (204)/(220) and (312)/(116) reflections of CIS. The solar cell parameters, Voc, Jsc, FF and efficiency (η) were found to be 303 mV, 28 mA cm−2, FF ∼ 53% and η = 4.5% for the CIS film deposited at −1.5 V. The values of shunt conductance, GD = 2.5 mS cm−2 and GL = 7.9 mS cm−2 and series resistance, RD = 0.81 Ω cm2 and RL = 0.19 Ω cm2 were calculated for dark and illuminated conditions. Mott–Schottky analysis was also carried out on the final solar cell in dark and illuminated conditions to study the carrier concentration and defects in the CdS/CIS interface.