
Solar cell development has been a key research topic at Fraunhofer ISE since its founding forty years ago with the aim of increasing efficiencies, reducing costs and saving valuable material resources. Our competence in the tandem technology is based on decades of research on the development of monolithic concentrator solar cells which have reached peak conversion efficiencies of 46.1%. Largely promising are the newest approaches of tandem cell architectures where we focus on the development of both III-V-silicon and perovskite-silicon tandem solar cells.