Kaneka and imec report a large area (6 inch semi-square) heterojunction silicon solar cell with a certified power conversion efficiency of 22.68% (certified by Fraunhofer ISE CalLab) with an electroplated copper contact grid on top of the transparent conductive oxide layer. This breakthrough is achieved at Kaneka Osaka lab using Kaneka’s copper electroplating technology which is based on imec’s state-of-the-art copper electroplating know-how. To realize the top grid electrode in heterojunctio...