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Pad printed front contacts for c-Si solar cells - a technological and economical evaluation

: Huljic, D.M.; Thormann, S.; Preu, R.; Lüdemann, R.; Willeke, G.

Fulltext urn:nbn:de:0011-n-148603 (1.1 MByte PDF)
MD5 Fingerprint: 1f6c032bfa148c889843c265948fcc6b
Created on: 27.10.2012

IEEE Electron Devices Society:
29th IEEE Photovoltaic Specialists Conference 2002. Proceedings : May 20-24, 2002 Hyatt Regency New Orleans New Orleans, Louisiana
New York, NY: IEEE, 2002
ISBN: 0-7803-7471-1
Photovoltaic Specialists Conference <29, 2002, New Orleans/La.>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Silziumsolarzellen; Metallisierung; Dickfilm-Kontakte; Tampondruck

Transfer pad printing is a promising technique that allows to overcome restrictions of conventional screen printing regarding front side metallisation of c-Si solar cells. Within this work a pad printed front grid in an industrial process scenario is evaluated. Technological as well as economical aspects are addressed. Regarding technological evaluation, contact lines of 45 µm printed on 10x10 cm² wafers demonstrate the fine line printing ability of pad printing on large areas. The ability to print on uneven and fragile substrates like EFG material is proven. However, low paste transfer limits the line resistance and, thus, fill factor. Nevertheless, based on an extensive optimization of printing parameters including different pad types, values > 75 % are achieved for double printing. Economical analysis reveals above 3% cost reduction per watt peak compared to state-of-the-art screen printing, taking into account the benefits of pad printing.