The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform
Mohammad Junaebur Rashid - One of the best experts on this subject based on the ideXlab platform.
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A systematic study on chemically deposited Cadmium sulfide (CdS) thin film
Journal of Theoretical and Applied Physics, 2020Co-Authors: Saiful Islam, Tasnia Hossain, Hasan Sarwar, Mohammad Junaebur RashidAbstract:In this work, the conventional chemical bath deposition (CBD) technique and its growth parameters were systematically studied to deposit CdS thin films on the glass substrate. The samples were prepared using a simple aqueous solution containing Cadmium Sulfate (CdSO_4·8H_2O), thiourea [SC(NH_2)_2], ammonium Sulfate [(NH_4)_2SO_4] as a source of Cadmium, sulfur, and a complexing agent, respectively. The deposited films were characterized to study the surface morphology, crystallographic structure, chemical composition, optical and electrical properties. Through this study, the structure was determined to cubic with (111) preferential orientation and the crystallinity of the films was improved with the increase of film thickness. The transmission spectra were recorded in the range of wavelength 300–600 nm. The optical bandgap of the optimized CdS films was varied from 2.43 to 2.74 eV. All the films exhibit n-type of conductivity which was found in the order of 10^–4 to 10^–5 (1/Ω-cm), suggesting that it would be suitable for the buffer layer in thin-film solar cells.
Saiful Islam - One of the best experts on this subject based on the ideXlab platform.
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A systematic study on chemically deposited Cadmium sulfide (CdS) thin film
Journal of Theoretical and Applied Physics, 2020Co-Authors: Saiful Islam, Tasnia Hossain, Hasan Sarwar, Mohammad Junaebur RashidAbstract:In this work, the conventional chemical bath deposition (CBD) technique and its growth parameters were systematically studied to deposit CdS thin films on the glass substrate. The samples were prepared using a simple aqueous solution containing Cadmium Sulfate (CdSO_4·8H_2O), thiourea [SC(NH_2)_2], ammonium Sulfate [(NH_4)_2SO_4] as a source of Cadmium, sulfur, and a complexing agent, respectively. The deposited films were characterized to study the surface morphology, crystallographic structure, chemical composition, optical and electrical properties. Through this study, the structure was determined to cubic with (111) preferential orientation and the crystallinity of the films was improved with the increase of film thickness. The transmission spectra were recorded in the range of wavelength 300–600 nm. The optical bandgap of the optimized CdS films was varied from 2.43 to 2.74 eV. All the films exhibit n-type of conductivity which was found in the order of 10^–4 to 10^–5 (1/Ω-cm), suggesting that it would be suitable for the buffer layer in thin-film solar cells.
Srinivasan Natarajan - One of the best experts on this subject based on the ideXlab platform.
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use of polyazaheterocycles in the assembly of new Cadmium Sulfate frameworks synthesis structure and properties
Crystal Growth & Design, 2010Co-Authors: Avijit Kumar Paul, Udishnu Sanyal, Srinivasan NatarajanAbstract:The reaction of Cadmium Sulfate in the presence of polyazaheterocyclic organic molecules gave rise to a variety of new Cadmium Sulfate phases in water containing solvothermal reaction. The compounds have two- (I) and three-dimensionally (II-VI) extended structures. All the compounds have structures built up by the connectivity involving the Cadmium octahedra and the Sulfate tetrahedra in which the heterocyclic organic molecules act as the ligand. The linkages between the Cd2+ and (SO4)2- ions form one- (II), two- (I, III, and IV), and three- (V and VI) dimensionally extended Cadmium Sulfate phases. The connectivity between Cd2+ ion and the heterocyclic ligand also gives rise to one- and two-dimensional structures. The inter-connectivity between the two units gives rise to the observed structures. The presence of Cd-O-Cd chains and Cd-O-Cd layers in some of the structures is noteworthy. The adsorption/desorption studies suggest that the Cadmium Sulfate phases adsorb/desorb anionic dyes selectively in the presence of water/ethanol, respectively. The photocatalytic degradation studies on cationic dyes under UV-irradiation indicate modest activity. The cyanosilylation of imines using the present compounds as heterogeneous catalyst indicate good catalytic behavior. The various properties exhibited by the Cadmium Sulfate phases suggest that these compounds are versatile. All the compounds were characterized by powder X-ray diffraction, thermogravimetric analysis, infrared (IR) and UV-visible studies.
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Synthesis, structure, transformation studies and catalytic properties of open-framework Cadmium thioSulfate compounds.
Dalton Transactions, 2010Co-Authors: Avijit Kumar Paul, Giridhar Madras, Srinivasan NatarajanAbstract:Five new thioSulfate based inorganic–organic hybrid open-framework compounds have been synthesized employing mild reaction conditions. Of the five compounds, [Na2(H2O)8][Cd(C10H8N2)(S2O3)2]·2H2O, I and [Cd2(C10H8N2)2(HS2O3)2(S2O3)2][(C10H9N2)2(C10H8N2)2]·8H2O, II have one-dimensional (1D) structures and [Cd(C10H8N2)(H2O)2(S2O3)]·2H2O, III, [Cd2(C10H8N2)3(S2O3)2], IV and [Cd2(C10H8N2)2.5(S2O3)2], V have three-dimensional (3D) structures. The 1D structures are somewhat related, formed by the bonding between tetrahedral Cd centers (CdN2S2) and 4,4′-bipyridine (bpy) units. The inter-chain spaces are occupied by the hanging thioSulfate units in both the cases along with Na(H2O)6 chains in I and free bpy units in II. The three 3D structures have one-dimensional Cadmium thioSulfate chains linked by bpy units. Interpenetration has been observed in all the 3D structures. The 3D structures appear to be related and can be derived from fgs net. Transformation studies on the 1D compound, [Na2(H2O)8][Cd(C10H8N2)(S2O3)2]·2H2O, I, indicated a facile formation of [Cd(C10H8N2)(H2O)2(S2O3)]·2H2O, III. Prolonged heating of I gave rise to a 3D Cadmium Sulfate phase, [Cd2(C10H8N2)2(H2O)3(SO4)2]·2H2O, VI. Compound VI has one-dimensional Cadmium Sulfate chains formed by six-membered rings connected by bpy units to form a 3D structure, which appears to resemble the topological arrangement of III. Transformation studies of III indicates the formation of IV and V, and at a higher temperature a new 3D Cadmium Sulfate, [Cd(C10H8N2)(SO4)], VII. Compound VII has a 4 × 4 grid Cadmium Sulfate layers pillared by bpy units. All the compounds were characterized by PXRD, TGA, IR and UV-visible studies. Preliminary studies on the possible use of the 3D compounds (III–VII) in heterogeneous cyanosilylation of imines appear to be promising.
Qibing Pei - One of the best experts on this subject based on the ideXlab platform.
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Electrochemical synthesis and photovoltaic property of Cadmium sulfide-polybithiophene interdigitated nanohybrid thin films
Journal of Physical Chemistry C, 2008Co-Authors: Dongjuan Xi, Stephen Furst, Bin Chen, Han Zhang, Qibing PeiAbstract:Interdigitated hybrid films consisting of Cadmium sulfide (CdS) nanorod arrays and interpenetrating polybithiophene have been synthesized by electrochemical depositions. The vertically aligned CdS nanorods were self-assembled on gold-coated glass substrates through a simple cathodic process of an electrolyte solution containing Cadmium Sulfate and potassium thiocyanate, without the use of any templates. The conjugated polymer polybithiophene was deposited into the nanorod arrays by in situ electrochemical polymerization. The resulting interdigitated nanohybrid films showed dense packing of the polymer in the nanorod arrays with a filling ratio estimated to be 76%. Raman spectroscopy and Fourier transform infrared revealed charge-transfer between the polymer and the CdS nanorods, consistent with the high filling ratio and improved polymer-CdS interface. Solar cells based on these hybrid films with vapor-deposited aluminum cathode exhibited a diode characteristic with a rectification ratio of 10(3) at +/- 1 V. The measured open-circuit voltage was 0.84 V, and the short-circuit current was 0.52 mA/cm(2). The overall power conversion efficiency was 0.38%.
Hasan Sarwar - One of the best experts on this subject based on the ideXlab platform.
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A systematic study on chemically deposited Cadmium sulfide (CdS) thin film
Journal of Theoretical and Applied Physics, 2020Co-Authors: Saiful Islam, Tasnia Hossain, Hasan Sarwar, Mohammad Junaebur RashidAbstract:In this work, the conventional chemical bath deposition (CBD) technique and its growth parameters were systematically studied to deposit CdS thin films on the glass substrate. The samples were prepared using a simple aqueous solution containing Cadmium Sulfate (CdSO_4·8H_2O), thiourea [SC(NH_2)_2], ammonium Sulfate [(NH_4)_2SO_4] as a source of Cadmium, sulfur, and a complexing agent, respectively. The deposited films were characterized to study the surface morphology, crystallographic structure, chemical composition, optical and electrical properties. Through this study, the structure was determined to cubic with (111) preferential orientation and the crystallinity of the films was improved with the increase of film thickness. The transmission spectra were recorded in the range of wavelength 300–600 nm. The optical bandgap of the optimized CdS films was varied from 2.43 to 2.74 eV. All the films exhibit n-type of conductivity which was found in the order of 10^–4 to 10^–5 (1/Ω-cm), suggesting that it would be suitable for the buffer layer in thin-film solar cells.
