Researchers from solar manufacturer Hanwha Q CELLS and research institute Helmholtz-Zentrum Berlin (HZB) have announced a power conversion efficiency of 28.7% for a two-terminal perovskite-silicon tandem solar cell.
The device is based on a silicon bottom cell relying on Hanwha Q CELLS' monocrystalline Q.antum half cell technology and a perovskite-based top cell.
'This latest record efficiency result, of 28.7%, is an improvement of almost one percentage point compared with the 2020 record value of 27.8%,' the module maker said in a statement. 'This boost in tandem efficiency has been enabled by improvement of both the perovskite and the silicon subcells.'
'Our experts have achieved several world records for tandem cells combining perovskite top cells with other bottom cells on a laboratory scale,' added HZB researcher Bernd Rech. 'It is remarkable how close the jointly achieved efficiency with a mass-production ready bottom cell already comes to what we can reach at a lab scale.'
No more technical details on the solar cell technology were provided.
In November 2021, HZB researchers produced a perovskite/silicon tandem solar cell with a world record efficiency of 29.80%. That result, which has been certified by Germany's Fraunhofer Institute for Solar Energy Systems' (ISE) CalLab, was also included in the charts of the U.S. Department of Energy's National Renewable Energy Laboratory. It improved upon the previous world record, achieved by perovskite developer Oxford PV in December 2020.