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Laser micro-sintering as a new metallization technique for silicon solar cells

: Aleman, M.; Streek, A.; Regenfuß, P.; Mette, A.; Ebert, R.; Exner, H.; Glunz, S.W.; Willeke, G.

Preprint urn:nbn:de:0011-n-664906 (376 KByte PDF)
MD5 Fingerprint: 827ccee50358ca750653639d6a07ef4d
Erstellt am: 24.1.2009

Poortmans, J. ; European Commission, Joint Research Centre -JRC-:
21st European Photovoltaic Solar Energy Conference 2006. Proceedings. CD-ROM : Proceedings of the international conference held in Dresden, Germany, 4 - 8 September 2006
München: WIP-Renewable Energies, 2006
ISBN: 3-936338-20-5
European Photovoltaic Solar Energy Conference <21, 2006, Dresden>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()

A laser-enhanced process to manufacture front side electrical contacts of silicon solar cells has been developed. A metallic powder is spread on top of a silicon wafer. The energy supplied by a laser beam sinters the powder according to a defined pattern, allowing the formation of thin electrical contacts to the silicon wafer. The rest of powder is removed and can be reused. To increase the conductivity of the contacts a light induced silver electroplating step has been performed. Different contacting metals have been tested (silver, molybdenum and tungsten). The first cells achieved fficiencies about 14.5% and a fill factor of 73.5%. Analysis of the cells was made by light microscopy, SEM and AFM. Characterization has been done by I-V and Suns-Voc measurements.