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Stanford Scientists Unveil Solar Panels That Work at Night

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Researchers at Stanford University have unveiled a breakthrough in solar technology: a new type of panel capable of generating electricity after sunset, under moonlight, and in cloudy or rainy conditions.

This innovation, referred to as “moonlight panels,” tackles a long-standing limitation in solar power—its inability to function without sunlight.

Led by Professor Shanhui Fan, the Stanford team developed a method to harness radiative cooling, a natural phenomenon in which heat dissipates from surfaces into the night sky. By integrating thermoelectric generators into standard commercial solar panels, the system captures this outgoing heat and converts it into electricity.

The panels can produce around 50 milliwatts per square meter at night. While this is well below the daytime output of conventional panels—typically 200 watts per square meter—it is enough to run small-scale devices such as LEDs and environmental sensors, especially in off-grid settings.

The technology can also be retrofitted into existing solar systems, offering a cost-effective solution to improve the consistency of renewable power generation.

Importantly, this development may reduce dependence on batteries, thereby lowering the environmental costs tied to battery manufacturing and disposal.

Researchers see strong potential for adoption in regions with inconsistent sunlight, viewing the innovation as a bridge that enables solar systems to function across the full 24-hour cycle.

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