Researchers from the U.S. Department of Energy's National Renewable Energy Laboratory (NREL) and the University of New South Wales achieved a new world-record efficiency for two-junction solar cells, creating a cell with two light-absorbing layers that converts 32.9% of sunlight into electricity.
source https://phys.org/news/2020-12-quantum-wells-enable-record-efficiency-two-junction.html
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