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Title: Anti-reflection coatings applied by acid-leaching process. Final report

Abstract

The Magicote C process developed by S.M. Thompsen was evaluated for use in applying an antireflective coating to the cover plates of solar cell panels. The process uses a fluosilicic acid solution supersaturated with silica at elevated temperature to selectively attack the surface of soda-lime glass cover plates and alter the physical and chemical composition of a thin layer of glass. The altered glass layer constitutes an antireflective coating. The process produces coatings of excellent optical quality which possess outstanding resistance to soiling and staining. The coatings produced are not resistant to mechanical abrasion and are attacked to some extent by glass cleansers. Control of the filming process was found to be difficult.

Authors:
Publication Date:
Research Org.:
Motorola, Inc., Phoenix, AZ (USA). Semiconductor Group
OSTI Identifier:
6618040
Alternate Identifier(s):
OSTI ID: 6618040
Report Number(s):
DOE/JPL/955387-80/4
DOE Contract Number:
NA-7-100-955387
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; ANTIREFLECTION COATINGS; FABRICATION; PERFORMANCE; SOLAR CELL ARRAYS; SOLAR CELLS; ABRASION; CHEMICAL PROPERTIES; COVERINGS; ETCHING; GLASS; LIGHT TRANSMISSION; OPTICAL PROPERTIES; SILICA; SILICATES; SILICIC ACID; STAINS; TEMPERATURE EFFECTS; WAVELENGTHS; WEATHERING; CHALCOGENIDES; COATINGS; DIRECT ENERGY CONVERTERS; EQUIPMENT; HYDROGEN COMPOUNDS; INORGANIC ACIDS; MINERALS; OXIDES; OXYGEN COMPOUNDS; PHOTOELECTRIC CELLS; PHOTOVOLTAIC CELLS; PHYSICAL PROPERTIES; SILICON COMPOUNDS; SILICON OXIDES; SOLAR EQUIPMENT; SURFACE FINISHING 140501* -- Solar Energy Conversion-- Photovoltaic Conversion

Citation Formats

Pastirik, E. Anti-reflection coatings applied by acid-leaching process. Final report. United States: N. p., 1980. Web. doi:10.2172/6618040.
Pastirik, E. Anti-reflection coatings applied by acid-leaching process. Final report. United States. doi:10.2172/6618040.
Pastirik, E. Mon . "Anti-reflection coatings applied by acid-leaching process. Final report". United States. doi:10.2172/6618040. https://www.osti.gov/servlets/purl/6618040.
@article{osti_6618040,
title = {Anti-reflection coatings applied by acid-leaching process. Final report},
author = {Pastirik, E.},
abstractNote = {The Magicote C process developed by S.M. Thompsen was evaluated for use in applying an antireflective coating to the cover plates of solar cell panels. The process uses a fluosilicic acid solution supersaturated with silica at elevated temperature to selectively attack the surface of soda-lime glass cover plates and alter the physical and chemical composition of a thin layer of glass. The altered glass layer constitutes an antireflective coating. The process produces coatings of excellent optical quality which possess outstanding resistance to soiling and staining. The coatings produced are not resistant to mechanical abrasion and are attacked to some extent by glass cleansers. Control of the filming process was found to be difficult.},
doi = {10.2172/6618040},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 1980},
month = {Mon Sep 01 00:00:00 EDT 1980}
}

Technical Report:

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  • The Magicote C process developed by S.M. Thompsen was evaluated for use in applying an antireflective coating to the cover plates of solar panels. The process uses a fluosilicic acid solution supersaturated with silica at elevated temperature to selectively attack the surface of soda-lime glass cover plates and alter the physical and chemical composition of a thin layer of glass. The altered glass layer constitutes an antireflective coating. The process produces coatings of excellent optical quality which possess outstanding resistance to soiling and staining. The coatings produced are not resistant to mechanical abrasion and are attacked to some extent bymore » glass cleansers. Control of the filming process was found to be difficult.« less
  • This report covers the second third of a nine-month program to study the production of anti-reflective coatings for glass solar module covers by means of a silica-saturated fluosilicic acid etch. The efforts of the program during this second quarterly period have been to evaluate the effects of process variations on the production of coated glass samples, to test the abrasion resistance of coated samples, and to test the chemical durability of samples. Progress is reported.
  • Progress during the first three months of a nine-month program to study the production of anti-reflective coatings for glass solar module covers by means of a silica-saturated fluosilicic acid etch is reported. The efforts of the program during this first quarterly period have been to set up the process and begin production of filmed sample glass plates. To this end, a temperature-controlled bath has been prepared, large quantities of the filming solution have been formulated, and production of samples has begun using empirically determined processes. (WHK)
  • Antireflective coatings which may be suitable for use on the covers of photovoltaic solar modules can be easily produced by a dipping process. The coatings are applied to glass by drawing sheets of glass vertically out of dilute aqueous sodium silicate solutions at a constant speed, allowing the adherent liquid film to dry, then exposing the dried film to concentrated sulfuric acid, followed by a water rinse and dry. The process produces coatings of good optical performance (96.7% peak transmission at 0.540 ..mu..M wavelength) combined with excellent stain and soil resistance, and good resistance to abrasion. The process is reproduceablemore » and easily controlled.« less
  • Two materials used as antireflection coatings for GaAs solar cells, Al sub Ga sub (1-x)As and a native anodically grown oxide were examined. The justification for treating Al sub Ga(1-x)As as a material for antireflection coatings may be found in an examination of the heteroface cell. So few carriers are generated in the wide band gap window that it may simply be treated as a component of the antireflection system. To characterization of a material for use in an antireflection coating demands the knowledge of both the refractive index, n, and the extinction coefficient, k, over the solar spectrum.