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Journal of Photonics for Energy

Thermal endurance study of polymers used in low concentration photovoltaic modules
Author(s): Shuying Yang; Kent Whitfield
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Paper Abstract

Thermal endurance studies were performed on the major polymeric components used in a Low concentration photovoltaic (LCPV) module using a thermal gravimetric analysis (TGA) method. Activation energy of the various polymers was obtained, and lifetimes were predicted based on the assumption of 5% weight loss for 30 years. Oven aging was used to verify the TGA thermal endurance prediction. Reasonable agreement between TGA prediction and oven baking results were reached, with the exception of ethylene-vinyl acetate (EVA) encapsulant that demonstrated a second-order reaction inconsistent with TGA assumptions. As a result, a more LCPV-relevant way to characterize the degradation of EVA was developed and demonstrated a linear relationship between PV device short-circuit current degradation and yellowness index. For the purpose of this EVA degradation analysis, a 20% reduction in PV device short circuit current was selected as the failure criteria.

Paper Details

Date Published: 4 October 2012
PDF: 13 pages
J. Photon. Energy 2(1) 021803 doi: 10.1117/1.JPE.2.021803
Published in: Journal of Photonics for Energy Volume 2, Issue 1
Show Author Affiliations
Shuying Yang, Solaria Corp. (United States)
Kent Whitfield, Solaria Corp. (United States)

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