DuPont’s PV Metallization Paste Improves MWT Solar Cell Efficiency

DuPont Microcircuit Materials (MCM) has launched its latest generation of Metal Wrap Through (MWT) technology called the DuPont Solamet PV701 photovoltaic metallization paste for rear interlinked silicon solar cell designs.

DuPont Solamet photovoltaic metallization pastes are one of the products being developed by DuPont Photovoltaic Solutions (DPVS). The sophisticated product composition facilitates the production of rear contact solar cell designs and enhances the conversion efficacy of MWT solar cells by up to 0.4%. This is part of the Dupont’s efforts to achieve a conversion efficacy of crystalline silicon solar cells by more than 20% by 2012.

The MWT is a unique cell structure that shifts the bus bars on the front side to the rear side and thus decreases the front side shading of the solar cell. The connections are done via holes in the silicon with similar composition as the bus bars.

The Solamet PV701 is used as a p-contact metallization and via paste for rear side tabbing interlinks. The paste has high mechanical strength, better electrical contact to front side silver grid, high-line conductivity, low shunting and better soldering ability as a p-contact metallization.