While there have been several theoretical proposals and experimental demonstrations of energy harvesting from the radiative cooling of a PV cell at night, the achieved power density is very low. Standard photovoltaic (PV) cells can provide a renewable off-grid source of electricity but only produce power from daytime solar irradiance and do not produce power at night. “A large fraction of the world’s population lacks access to the electric grid. Department of Energy and the Strategic Energy Alliance program at Stanford University. New research paper “Nighttime electric power generation at a density of 50 mW/m2 via radiative cooling of a photovoltaic cell” from Stanford, supported by U.S.
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