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Hanae Toura,Yousaf Hameed Khattak,Faisal Baig,Bernabe Mari Soucase,Mohamed Ebn Touhami,Bouchaib Hartiti 한국물리학회 2019 Current Applied Physics Vol.19 No.4
Cu2ZnSnS4 kesterite thin films have been electrochemically deposited on indium doped tin oxide (ITO) coated glass substrates from an aqueous electrolyte solution containing CuSo4, ZnSo4, SnSo4 and Na2S2O3 precursors in one step deposition. The purpose of this work is to reduce the cost of fabrication of CZTS thin films with good crystallinity by investigated the effect of complexing agent Na2So4 with Na3C6H5O7 on annealing temperature of CZTS thin film. Based on the results it was found that good crystal structure was achieved at temperature 350 °C, that is below the reported annealing temperature in the literature. The electrodeposition process was maintained at room temperature with a working potential set at −1.05 V vs. Ag/AgCl. The annealed CZTS films were characterized by X-ray diffraction revealed the formation of a crystalline phase CZTS with major and intense peaks. Scanning electron microscopy (SEM) analysis stick to EDS show compact and uniform surface morphology with a spherical crystalline geometry and near stoichiometry metal atomic ratio for the different samples prepared. Atomic force microscopy (AFM) analysis confirms these results. From UV–visible spectroscopy, bandgap of around 1.5 eV was estimated for the kesterite thin films.
Devender Singh,Vijeta Tanwar,Anura Priyajith Samantilleke,Bernabe Mari,Shri Bhagwan,Krishan Chander Singh,Pratap Singh Kadyan,Ishwar Singh 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.3
Eu2+ and Eu2++Ln3+ doped SrAl4O7 nanophosphors were synthesized byrapid gel combustion process. The morphology of prepared phosphorswas examined with scanning and transmission electron microscopy. The phase identification and the crystal structures of nanophosphorswere studied using X-ray powder diffraction techniques. Luminescencecharacteristics of the prepared nanophosphors were analyzed on accountof excitation, emission and phosphorescence decay analysis. Theemission spectra demonstrated the broad green emission attributed to4f65d1→ 4f7 transition of the Eu2+ ions. The effect of codoping of sometrivalent lanthanide (Dy3+, Pr3+ and Y3+) ions were investigated forimproving the emission intensity and phosphorescence decay time ofthe basic lattice of SrAl4O7:Eu2+ phosphors. The synthesized materialshad enhanced bright luminescent properties that could suitably beapplied for display as well as photovoltaic applications.