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Title: High temperature stability of broadband Anti-Reflection coatings on soda lime glass for solar modules
Authors: Womack, Gerald
Kaminski, Piotr M.
Walls, Michael
Keywords: Anti-reflective
Heat treatment
Issue Date: 2015
Publisher: © IEEE
Citation: WOMACK, G., KAMINSKI, P.M. and WALLS, M., 2015. High temperature stability of broadband Anti-Reflection coatings on soda lime glass for solar modules. Presented at the IEEE 42nd Photovoltaic Specialists Conference (PVSC), New Orleans, 14-19th June 2015.
Abstract: Reflections from glass surfaces reduce the efficiency of photovoltaic devices. Reflections can be reduced using a broadband Multi-layer Anti-Reflection (MAR) coating. For thin film CdTe modules, the glass is also the substrate. Manufacturers would prefer to use pre-MAR coated glass, so it is essential to establish if the MAR coating can withstand the module production process conditions. Thin film CdTe module fabrication requires temperatures up to ~500°C. Crazing may occur due to mismatch of the thermal expansion coefficients between the glass and the coating materials. The resilience of MAR coatings on soda lime glass, Eagle 2000™ Glass, and NSG TECTM 7 has been tested by exposure to increasing temperatures up to 800°C to establish the point of failure. SEM imaging and reflection measurements were used to observe the damage caused. Surprisingly, the MAR coating is unaffected up to a temperature of 590°C on soda lime glass substrates and up to 800°C on Eagle Glass. This provides confidence that thin film CdTe module manufacturers can use existing processes with pre-MAR coated glass.
Description: © 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Sponsor: The authors are grateful to UKERC for funding through the EPSRC Supergen SuperSolar Hub.
Version: Accepted for publication
DOI: 10.1109/PVSC.2015.7356265
URI: https://dspace.lboro.ac.uk/2134/20082
Publisher Link: http://dx.doi.org/10.1109/PVSC.2015.7356265
ISBN: 9781479979448
ISSN: 0160-8371
Appears in Collections:Conference Papers and Presentations (Mechanical, Electrical and Manufacturing Engineering)

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