The Institute for Solar Energy Research Hamelin (ISFH), a German industry-focused research center, has expanded its calibration capabilities to include large-area perovskite-silicon tandem solar cells. The institute said it will now offer calibration services for perovskite-silicon tandem devices up to the G12 wafer format, with an edge length of 210 mm.

“Tandem solar cells are significantly more complex than conventional silicon cells. Specialized calibration is required to ensure that reported efficiencies are accurate, comparable, and trusted by researchers, manufacturers, and investors,” said Karsten Bothe, head of the ISFH Calibration and Test Center (CalTeC). “We provide the measurement confidence needed to advance tandem photovoltaics from laboratory breakthroughs to commercial products.”

According to ISFH, the new measurement infrastructure addresses several key challenges in tandem solar cell characterization. These include subcell-specific spectral adjustment and precise spectral mismatch correction, compensation for shading effects caused by contacting bars, correction of irradiance non-uniformity across large-area devices, homogeneous temperature control, and measurement protocols that account for device metastability.

“By combining internationally recognized calibration expertise with dedicated tandem photovoltaic metrology, ISFH CalTeC provides reliable and traceable efficiency measurements that support technology development, performance benchmarking, and the commercialization of high-efficiency tandem solar cells worldwide,” the institute said.