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Proceedings Paper

Status and future perspective of a-Si:H, a-SiGe:H, and nc-Si:H thin film photovoltaic technology
Author(s): Jeffrey Yang; Subhendu Guha
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Paper Abstract

United Solar Ovonic is world's largest manufacturer of thin film solar laminates that convert sunlight to electricity. In 1997, we attained initial 14.6% and stable 13.0% cell efficiencies using an a-Si:H/a-SiGe:H/a-SiGe:H triple-junction structure, which established the foundation of large volume roll-to-roll production. Since then, the power rating of our standard product has been steadily improving from 128 W to 136 W and 144 W. For future generation high efficiency products, we have investigated the possibility of using nc-Si:H to replace the narrow bandgap a-SiGe:H intrinsic layer in the middle and bottom cells of the triple-junction structure. We have investigated various deposition techniques for improving the nc-Si:H material property, solar cell efficiency, and deposition rate. The triple-junction solar cell efficiency incorporating nc-Si:H in the middle and bottom cells has exceeded the record efficiency previously achieved using the conventional a-Si:H/a-SiGe:H/a-SiGe:H triple-junction structure. However, in order to insert the nc- Si:H technology into large volume production, several important issues need to be addressed and resolved. We are currently focusing on these key technical challenges, including high efficiency, high rate nc-Si:H deposition, and large-area nc-Si:H uniformity. In this paper, we review recent advances in a-Si:H and nc-Si:H based multi-junction solar cells and modules.

Paper Details

Date Published: 20 August 2009
PDF: 14 pages
Proc. SPIE 7409, Thin Film Solar Technology, 74090C (20 August 2009); doi: 10.1117/12.827419
Show Author Affiliations
Jeffrey Yang, United Solar Ovonic, LLC (United States)
Subhendu Guha, United Solar Ovonic, LLC (United States)

Published in SPIE Proceedings Vol. 7409:
Thin Film Solar Technology
Alan E. Delahoy; Louay A. Eldada, Editor(s)

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