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Industrially feasible multi crystalline metal wrap through (mwt) silicon solar cells exceeding 16% efficiency

: Clement, F.; Lutsch, M.; Kubera, T.; Wirth, H.; Harmel, C.; Wolke, W.; Biro, D.; Preu, R.

Fulltext urn:nbn:de:0011-n-2094984 (1.1 MByte PDF)
MD5 Fingerprint: 5a8243f44b2c8f23effb159435b7ba7f
Created on: 28.11.2012

17th International Photovoltaic Science and Engineering Conference, PVSEC 2007. Technical Digest : December 3-7, 2007, Fukuoka International Congress Center
Fukuoka, 2008
International Photovoltaic Science and Engineering Conference (PVSEC) <17, 2007, Fukuoka>
Conference Paper, Electronic Publication
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 is appropriate for a fast transfer to industry. Hence, an industrially feasible process based on a new contact design was developed and tested at ISEĆ¢ s PV-TEC pilot-line. A maximum cell efficiency of 16.0 % is achieved. Compared with conventionally processed cells made of the same mc Si-block, an efficiency gain of about 0.5 % absolute is observed. Due to a cell interconnection on the back the serial resistance losses in the tabs decrease. Therefore, a fill factor of almost 77 % and an efficiency of 15 % for a MWT module prototype (16 MWT cells) is reached.