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Enhancement of dielectric barrier layer properties by sol-gel and PECVD stacks

AutorLópez-López, Carmen ; Menéndez, Mari-Fé; Menéndez, Luis Andrés; Menéndez, Armando; Alba, María D. ; Sánchez-Cortezón, Emilio; Delgado-Sánchez, José M.
Fecha de publicación2016
EditorElsevier
CitaciónSurface and Coatings Technology 305: 36- 40 (2016)
ResumenThin-film PV modules grown on flexible, light weight, thermally stable and low cost substrates such as stainless steel foil, are an attractive product for solar market applications. When metal foils are used as substrate, it is essential to deposit a dielectric barrier layer to isolate electrically and chemically the thin-film solar cells front the substrate. In this work, SiOx stacks deposited on ‘rough’ stainless steel by a combination of a new sol-gel formulation and a Plasma Enhanced Chemical Vapor Deposition (PECVD) deposition step are reported as a suitable dielectric barrier layer candidate. Using these SiOx multilayers, a smooth and homogeneous film was achieved. X-ray diffraction (XRD) analysis showed that back contact of the solar cell (based on Molybdenum) is not affected by the presence of the barrier layer. Moreover, according to X-ray photoelectron spectroscopy (XPS) and Secondary Ion Mass Spectrometry (SIMS) measurements, this approach led to excellent barrier layer properties against the diffusion of impurities from the stainless steel. A complete electrical characterization of these dielectric barrier layers was also carried out showing good electrical insulation.
URIhttp://hdl.handle.net/10261/148643
DOI10.1016/j.surfcoat.2016.07.085
Identificadoresdoi: 10.1016/j.surfcoat.2016.07.085
issn: 0257-8972
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