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Fraunhofer ISE, in collaboration with Oxford PV , has developed advanced shingled perovskite-silicon (perovskite-Si) tandem PV modules under Germany’s government-backed HoTSun research initiative. The glass-glass monofacial Matrix Shingled tandem module. (Photo Credit: Fraunhofer ISE) The modules were fabricated at Oxford PV’s pilot production facility in Brandenburg an der Havel, where the company supplied its perovskite-Si tandem cells. These cells feature a perovskite top layer, only a few hundred nanometers thick, deposited on a heterojunction (HJT) silicon bottom cell using thin-film processes. While average tandem cell efficiencies were not disclosed, Fraunhofer ISE highlighted the technology’s theoretical efficiency potential of up to 43.3%, significantly higher than the current 29.4% silicon limit.