Kaneka and imec report a large area (6inch semi-square) heterojunction silicon solar cell with a certified power conversion efficiency of 22.68% with an electroplated copper contact grid.
- Cell conversion efficiency of 22.68% was independently certified by Fraunhofer ISE CalLab
This breakthrough is achieved at Solar cell Lab at Kaneka Osaka, using heterojunction technology with Kaneka’s copper electroplating technology which is based on imec’s state-of-the-art copper electroplating knowhow. This development will be presented at Kaneka booth at Intersolar Europe 2012 Munich.
To realize the top grid electrode in heterojunction silicon solar cells, silver screen printing is the preferred technology in the PV (photovoltaic) industry. However, a drawback of this technology is the difficulty to lower resistivity and to thin the metal line in silver screen printed contacts. As a result, efficiencies remain below optimal and cost remains relatively high. Replacing the screen-printed silver with electroplated copper overcomes the disadvantages of silver screen printing, enabling higher efficiencies and reduced fabrication costs.
Kaneka’s Photovoltaics European Laboratory is located at the imec campus in Leuven (Belgium), with access to imec’s state-of-the-art PV infrastructure. The collaboration between Kaneka and imec has helped the improvement of Kaneka’s thin-film solar cells and the development of next-generation heterojunction cells.