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Kinetics of Light-Induced Effects in Mixed-Phase Hydrogenated Silicon Solar Cells

Published online by Cambridge University Press:  01 February 2011

Guozhen Yuea ,
Baojie Yan ,
Jeffrey Yang ,
Kenneth Lord  and
Subhendu Guha
Guozhen Yuea
Affiliation:
United Solar Systems Corp., 1100 West Maple Rd., Troy, MI 48084, U.S.A.
Baojie Yan
Affiliation:
United Solar Systems Corp., 1100 West Maple Rd., Troy, MI 48084, U.S.A.
Jeffrey Yang
Affiliation:
United Solar Systems Corp., 1100 West Maple Rd., Troy, MI 48084, U.S.A.
Kenneth Lord
Affiliation:
United Solar Systems Corp., 1100 West Maple Rd., Troy, MI 48084, U.S.A.
Subhendu Guha
Affiliation:
United Solar Systems Corp., 1100 West Maple Rd., Troy, MI 48084, U.S.A.
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Abstract

We have observed a significant light-induced increase in the open-circuit voltage (Voc) of mixed-phase hydrogenated silicon solar cells. In this study, we investigate the kinetics of the light-induced effects. The results show that the cells with different initial Voc have different kinetic behavior. For the cells with a low initial Voc (less than 0.8 V), the increase in Voc is slow and does not saturate for light-soaking time of up to 16 hours. For the cells with medium initial Voc (0.8 ∼ 0.95 V), the Voc increases rapidly and then saturates. Cells with high initial Voc (0.95 ∼ 0.98 V) show an initial increase in Voc, followed bya Voc decrease. All light-soaked cells exhibit a degradation in fill factor. The temperature dependence of the kinetics shows that light soaking at high temperatures causes Voc increase to saturate faster than at low temperatures. The observed results can be explained by our recently proposed two-diode equivalent-circuit model for mixed-phase solar cells.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 762: Symposium A – Amorphous and Nanocrystalline Silicon-Based Films – 2003 , 2003 , A12.2
Copyright
Copyright © Materials Research Society 2003

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