Development of industrial high-efficiency back-contact czochralski-silicon solar cells

Back‐contact silicon solar cells feature high efficiencies, simpler module assembly, and improved aesthetics. The emitter wrap through (EWT) cell structure is particularly attractive for use with industrial processing (e.g., screen‐printed metallization) and common solar‐grade p‐type Si materials. W...

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Bibliographic Details
Published in:Progress in photovoltaics 2011-11, Vol.19 (7), p.887-893
Main Authors: Gee, James M., Kumar, Prabhat, Howarth, James, Schroeder, Todd, Franklin, Jeff, Dominguez, Jason, Tanner, David
Format: Article
Language:English
Subjects:
Applied sciences
back-contact solar cells
Energy
EWT
Exact sciences and technology
Natural energy
Photovoltaic conversion
silicon solar cells
Solar cells. Photoelectrochemical cells
Solar energy
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Summary:Back‐contact silicon solar cells feature high efficiencies, simpler module assembly, and improved aesthetics. The emitter wrap through (EWT) cell structure is particularly attractive for use with industrial processing (e.g., screen‐printed metallization) and common solar‐grade p‐type Si materials. We report development of a high‐efficiency EWT back‐contact cell using p‐type Cz silicon and only industrial processing techniques such as screen‐printed metallizations, diffusions, and PECVD. An efficiency of 19.0% has been achieved with large area (156‐mm pseudo‐square) cells. Detailed characterization and modeling have been performed to understand the optical and electrical losses, and these results were used to generate a roadmap to improve the efficiency to over 20%. Copyright © 2011 John Wiley & Sons, Ltd. A 19%‐efficient back‐contact silicon solar cell using emitter wrap through (EWT) structure and only industrial processing is demonstrated..
ISSN:1062-7995
1099-159X
1099-159X
DOI:10.1002/pip.1075