December 19, 2022Tandem solar cell achieves 32.5% efficiencyThe current world record of tandem solar cells consisting of a silicon bottom cell and a perovskite top cell has once again been broken at HZB.The certifying institute European Solar Test Installation (ESTI) in Italy measured the tandem cell and officially confirmed this value which is also included in the NREL chart of solar cell technologies, maintained by the National Renewable Energy Lab, U.S..Scientists from HZB could significantly improve on the efficiency of perovskite/silicon tandem solar cells.All the teams involved at HZB, especially the PV Competence Center (PVComB) and the HySPRINT Innovation lab teams have worked together successfully and with passion," says Prof. Steve Albrecht.Fast progressOngoing efficiency development by various research institutes and companies over the last years and especially the last month have been quite exciting for the field: Various teams from HZB achieved a record value in late 2021 with an efficiency of 29.8% that was realized by periodic nanotextures.HZB's scientific director, Prof. Bernd Rech, says, "At 32.5%, the solar cell efficiency of the HZB tandems is now in ranges previously only achieved by expensive III/V semiconductors."