Experimental Device Generates Electricity from the Coldness of the Universe
WASHINGTON, D.C., May 6, 2019 -- The obvious drawback of solar panels is that they require sunlight to generate electricity. Some have observed that for a device on Earth facing space, which has a frigid temperature, the chilling outflow of energy from the device can be harvested using the same kind of optoelectronic physics we have used to harness solar energy.
New work, in a recent issue of Applied Physics Letters, from AIP Publishing, looks to provide a potential path to generating electricity like solar cells but that can power electronics at night.
An international team of scientists has demonstrated for the first time that it is possible to generate a measurable amount of electricity in a diode directly from the coldness of the universe. The infrared semiconductor device faces the sky and uses the temperature difference between Earth and space to produce the electricity.
"The vastness of the universe is a thermodynamic resource," said Shanhui Fan, an author on the paper. "In terms of optoelectronic physics, there is really this very beautiful symmetry between harvesting incoming radiation and harvesting outgoing radiation."
In contrast to leveraging incoming energy as a normal solar cell would, the negative illumination effect allows electrical energy to be harvested as heat leaves a surface. Today's technology, though, does not capture energy over these negative temperature differences as efficiently.
By pointing their device toward space, whose temperature approaches mere degrees from absolute zero, the group was able to find a great enough temperature difference to generate power through an early design.
"The amount of power that we can generate with this experiment, at the moment, is far below what the theoretical limit is," said Masashi Ono, another author on the paper.
The group found that their negative illumination diode generated about 64 nanowatts per square meter, a tiny amount of electricity, but an important proof of concept, that the authors can improve on by enhancing the quantum optoelectronic properties of the materials they use.
Calculations made after the diode created electricity showed that, when atmospheric effects are taken into consideration, the current device can theoretically generate almost 4 watts per square meter, roughly one million times what the group's device generated and enough to help power machinery that is required to run at night.
By comparison, today's solar panels generate 100 to 200 watts per square meter.
While the results show promise for ground-based devices directed to the sky, Fan said the same principle could be used to recover waste heat from machines. For now, he and his group are focusing on improving their device's performance.
MORE IN ITECHPOST
How Scars are Formed and How to Remove It
Scar formation is a result of a biological process in skin after an injury or trauma. It is formed when the dermis layer of the skin is damaged. It is our body's way to repair tissues and organs and is a natural part of the healing process. A scar tissue is composed of the same type of collagen it is replacing with. Scars lacks elasticity compared to normal tissue. There are different degrees of scarring depending on the injury the tissue is subjected to.
Top 5 Best Business Gadgets
Most businesses are investing in business tech gadgets and other business accessories to improve efficiency and productivity. That’s why companies are furnishing their modern offices with business tools and devices.
NASA's Hubble Telescope Captures Mesmerizing Images of Spiral Galaxies and Interstellar Comet Borisov
NASA's Hubble has done it again as it captured amazing images of spiral galaxies and the first comet outside of our solar system.
Ghostbusters: The Video Game Remastered Review: A Flop or A Hit?
A couple of days ago, Ghostbusters: The Video Game Remastered was finally released, promising a better and improved version of the original video game. Was it able to deliver its promise or not?