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Synthesis of Cu(In,Ga)(S,Se)2 thin films using an aqueous spray-pyrolysis approach, and their solar cell efficiency of 10.5%

Publisher : J. Mater. Chem. A

Campus : Coimbatore

Center : Center for Industrial Research and Innovation (ACIRI)

Year : 2015

Abstract : Semiconducting Cu(In{,}Ga)(S{,}Se)2 (CIGSSe) thin-film is prepared by the spray-pyrolysis of aqueous precursor solutions of copper (CuCl2){,} indium (InCl3){,} gallium (GaCl3){,} and sulphur (SC(NH2)2) sources. The non-vacuum approach of making the CIGSSe thin film using environmentally benign halide-based aqueous precursor solutions paves the way for fabricating solar cells at a much cheaper cost. Here{,} gallium (Ga) is incorporated into the host lattice of CuIn(S{,}Se)2 (CISSe) films grown on a Mo-coated soda-lime glass substrate to modify the optoelectronic properties of CIGSSe films. The bandgap engineered{,} Ga-doped CIGSSe film leads to better photovoltaic characteristics and shows one of the highest efficiency for CIGS thin film solar cell made by the non-vacuum deposition of environmentally-friendly precursors. The optimum efficiency of solar cells with the device configuration of glass/Mo/CIGSSe/CdS/i-ZnO/AZO show j-V characteristics of Voc = 0.621 V{,} jsc = 24.29 mA cm-2{,} FF = 69.84%{,} and a power conversion efficiency of 10.54% under simulated AM 1.5{,} 100 mW cm-2 illuminations{,} demonstrating its potential in making a cost-effective thin film solar cell.

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