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Abstract
In this work graphene oxide/cadmium sulphide [GO/CdS]n multilayer films were obtained onto FTO/SLG substrates by cyclic electrophoretic deposition (EPD) and successive ion layer adsorption and reaction (SILAR) methods, with 3, 5, 7 and 10 cycles. The optical characterization for 3 cycles sample exhibits an optical band gap of ∼2.9 eV due the nanocrystalline nature of CdS, from 5 to 10 cycles a blue shift is observed in the band gap around ∼2.15 eV by the electronic disorder induced by graphene oxide intercalation and the mixture of hexagonal/cubic phases of CdS. Raman spectra shows the longitudinal optical modes LO, 2LO and 3LO, the LO peak position shows a blue shift in comparison to the bulk CdS. The multilayer films of 3 and 5 cycles shows a wide range of photoluminescence emission from 350 to 700 eV, for samples of 7 and 10 cycles a quenching and red shift is observed attributed to the CdS crystals growth with a peak emission at 615 eV from bulk CdS, which make the materials suitable for photovoltaic solar cells and UV-Vis diodes for optoelectronic devices.
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1 Instituto Politécnico Nacional, Materiales y Tecnologías para Energía, Salud y Medio Ambiente (GESMAT), CICATA Altamira Km. 14.5 Carretera Tampico-Puerto Industrial Altamira , 89600, Altamira, Tamaulipas , México
2 Instituto Politécnico Nacional, Materiales y Tecnologías para Energía, Salud y Medio Ambiente (GESMAT), CICATA Altamira Km. 14.5 Carretera Tampico-Puerto Industrial Altamira , 89600, Altamira, Tamaulipas , México; Universidad Tecnológica de Altamira, Química Industrial y Nanotecnología, Materiales y Tecnologías para Energía, Salud y Medio Ambiente (GESMAT), Blvd. de los Ríos Km. 3+100, Carretera a Puerto Industrial , 89608 Altamira, Tamaulipas , México
3 Escuela de Ingeniería, Universidad Marista de Mérida , Mérida, Yucatán, 97300 , México