Abstract
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 ISEâ 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.