HZB achieves 29.8 percent efficiency with tandem solar cell

The world record cell (here in front of the electron storage ring BESSY II) has an area of about one square centimeter, which is usual for research purposes

Helmholtz-Zentrum Berlin (HZB) has announced a new record for a perovskite silicon heterojunction tandem cell. The cell, which has an area of about one square centimeter, achieves an efficiency of 29.80 percent, as certified by Fraunhofer ISE CalLab. The front side of the silicon cell was structured in such a way that it absorbs light particularly efficiently. Improvements were also achieved on the back of the cell, which reflects the infrared light back into the silicon absorber.
The new HZB cell thus surpasses the previous record holder, Oxford PV, which had achieved an efficiency of 29.52 at the end of 2020. HZB's previous best for this technology was 29.15 percent.
The new efficiency is recorded in the U.S. Renewable Energy Research Center's (NREL) ranking list, which provides an overview of the global record values for various cell technologies.
© PHOTON

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