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

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


Solar energy materials and solar cells 93 (2009), Nr.6-7, S.1051-1055
ISSN: 0927-0248
International Photovoltaic Science and Engineering Conference (PVSEC) <17, 2007, Fukuoka>
Zeitschriftenaufsatz, Konferenzbeitrag
Fraunhofer ISE ()

On the way to higher efficiencies, back contact solar cells seem to be a promising alternative to the conventional screen-printed solar cells. Especially, the metal wrap through (MWT) 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 the pilot-line of the Photovoltaic Technology Evaluations Center (PV-TEC). A maximum cell efficiency of 16% is achieved. Compared with conventionally processed cells made of the same mc Si-block, an efficiency gain of 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.