Nocturnal solar cells introduced

People often use solar panels to absorb clean energy (solar energy), but it has certain limitations. Solar panels absorb best in a well-lit environment with direct sunlight, while cloudy and rainy weather can limit their energy efficiency. As it stands, it cannot continue to work when night falls and there is no direct or indirect light.

A team of researchers from the School of Photovoltaic and Renewable Energy Engineering at UNSW Sydney and the School's Research Centre have come together to make a key breakthrough in infrared technology, and the new technology will enable the development of solar panels that work at night.

Researchers have successfully tested a thermal radiation diode device that converts infrared heat into electrical energy. The researchers say that this thermal radiation diode technology is similar to that used for night vision goggles.

Nicholas Ekins-Daukes, lead researcher at the research centre, said in a press interview that thermodynamics was born in the late 18th and early 19th centuries when it was discovered that the efficiency of a steam engine depended on the temperature difference across the engine. The same principle applies to solar energy, where the sun can provide the heat source and the relatively cool solar panels on the Earth's surface act as cold absorbers so that electricity can be generated.

However, if infrared radiation is emitted from the Earth into outer space, the Earth is a relatively warm celestial body and space is extremely cold. According to the same thermodynamic principles, this would also allow electricity to be generated using the temperature difference and emitting infrared light into space.

Currently, the energy generated by the test device is very small compared to the energy efficiency of solar panels - about 0.001%. But this does bode well for the future, as solar panels that can be used at night will likely be developed. The team is currently conducting research on a large scale and looking to establish industry partnerships.

We normally think that light also consumes a certain amount of energy when it is emitted, but we can emit light with radiant energy in the mid-infrared band, and the method has now been shown to have the potential to successfully extract electricity," says Dawkes. Current technology is not yet sufficient to bring thermal radiation diode devices into millions of homes, but we have demonstrated the feasibility of this method and hope that more progress will be made in the coming years.

There is also a lot of support from scientists for the development of solar panels that operate 24/7, with Norwegian researcher Rune Strandberg having been the first to explore this possibility. Researchers at Stanford University are also currently exploring ways of harnessing thermal energy in the dark.