The US Department of Energy’s National Renewable Energy Laboratory (NREL) has raised the efficiency record for solar cells (under standard one-sun global illumination) to 39.5% (‘Triple-junction solar cells with 39.5% terrestrial and 34.2% space efficiency enabled by thick quantum well superlattices’, Joule vol6, issue5 (18 May 2022), p1121). NREL previously set a record in 2020 with a 39.2%-efficient six-junction solar cell using III-V materials...
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