Do Solar Panels Work At Night

2025-05-28

Photovoltaic power generation serves as a crucial pillar for global energy transformation, and due to its clean and environmentally friendly properties, it possesses unprecedented development opportunities. Traditional solar energy technology presents important limitations because its power generation is entirely dependent on sunlight conditions. For example, while wind power generation (depending on geographical conditions) has the capability to run day and night, and hydropower generation output can be continuous and stable, solar energy generation (depending on sunlight) cannot - thus these limits have long left solar energy technology unable to scale.

The news is exciting that the research team of the University of New South Wales, Australia recently had a prolific outcome and broke through the disruptive thermal radiation power generation technology. This technology cleverly makes use of the infrared radiation to facilitate electricity generation at night (which is similar to the imaging mechanism of the night vision system). Specifically, as the sun sets, the surface continues to emit the radiant heat energy it absorbed, an important source of infrared rays, even though visible light is now absent.

The thermal radiation diode semiconductor developed by the research team was able to pinpoint selection and collect and convert infrared radiation energy. Project Lead Professor Ned Ekins-Dowkes was clear on how to describe it: "Thermal imagers show the thermal radiation of objects at night, and there is an analogy in converting this invisible radiation as it too is thermal radiation in the form of photons which we can convert to usable electrical energy." What is more significant is that this new technology, unlike previous thermal technology, has broken the temperature limit and the thermoelectric conversion efficiency does not degrade at lower temperatures.

While current night-time generated efficiency is only one-tenth of that experienced during the day, if we think of photovoltaic technologies from 2% efficiencies to improvements to 25% efficiencies, there is a lot of growth for this technology. It is noteworthy that the possible beneficial applications are far larger than just the grid power system. For example, if medical implants can use human infrared radiation for their power sources the onus of battery replacement will be completely eliminated. To have innovation that converts waste thermal radiation to clean energy has undoubtedly opened avenues towards a sustainable future.

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