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Processing and comprehensive characterisation of screen-printed mc-Si Metal Wrap Through (MWT) solar cells

: Clement, F.; Lutsch, M.; Kubera, T.; Kasemann, M.; Kwapil, W.; Harmel, C.; Mingirulli, N.; Erath, D.; Wirth, H.; Biro, D.; Preu, R.

Volltext urn:nbn:de:0011-n-734607 (425 KByte PDF)
MD5 Fingerprint: 9f8be69e0ed26c85bd62875a3b1e995d
Erstellt am: 29.9.2012

European Commission, Joint Research Centre -JRC-:
The compiled state-of-the-art of PV solar technology and deployment. 22nd European Photovoltaic Solar Energy Conference, EU PVSEC 2007. Proceedings of the international conference. CD-ROM : Held in Milan, Italy, 3 - 7 September 2007
München: WIP-Renewable Energies, 2007
ISBN: 3-936338-22-1
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <22, 2007, Milano>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()

On the way to higher efficiencies, back contact solar cells seem to be a promising alternative to conventional screen-printed solar cells. Especially, the MWT (metal wrap through) solar cell concept with only two additional process steps compared with the conventional cell process is appropriate for a fast transfer to industry. Hence, a pilot-line process based on a new contact design was developed and tested. A batch of 80 mc-Si MWT solar cells was successfully produced at ISE's PV-TEC pilot-line. Cell efficiencies up to 16 % are achieved in this first run. Compared with conventionally processed cells made of the same mc Si-block, an efficiency gain up to 0.4% is observed. The reason for the high efficiency is a high short circuit current due to the absence of the bus bars on the front. Furthermore, a cell interconnection only on the back is possible and thus less serial resistance losses in the tabs. Therefore, a fill factor of almost 77 % and an efficiency of 15 % for a MWT module prototype (16 MWT cells) is reached.