New shielding covers based on transparent polyimide/ferrous sulfide composites that reduce optical losses in solar cells. (8th February 2022)

• Record Type: Journal Article
• Authors: Barzic, Andreea Irina; Albu, Raluca Marinica; Stoica, Iuliana; Hulubei, Camelia
• Is Part Of: Composites science and technology. Volume 218(2022)
• Publication Date: 2022-02-08
• Subjects: Polymer-matrix composites (PMCs) -- Interface -- Atomic force microscopy (AFM) -- Refractive index; Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2021.109140
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: The protective cover glass is an essential element of solar cells in superstrate configuration, determining their efficiency by means of its lightweight, flexibility, optical, morphological and interfacial properties. In this work, a set of new composites based on a fluorinated polyimide and various contents of ferrous sulfide was prepared and characterized for use as shielding covers. FTIR spectra confirmed the structure of the synthesized samples. The transmittance of the obtained films was above 77% at 500 nm at 10% ferrous sulfide, maintaining a good optical clarity upon reinforcement. The measured refraction index ranges between 1.628 (0% filler) and 1.730 (20% filler), rendering a good match with those of the adjacent ITO transparent conductive oxide, which favors reduction of the optical losses. Here is pointed out for the first time, the temperature effect in refractive index and its impact on diminishment of optical losses at interface. The fluorinated structure of the polyimide enables high hydrophobicity that removes the dew related issues, rendering anti-soiling features to the composite samples. Moreover, diffuse coplanar surface barrier discharge plasma exposure of one side of the prepared films enhances the adhesion with the neighboring conductive layer, hence induces a greater compatibility among the solar cell layers. Graphical abstract: Image 1