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Energy

Laser and solar: the innovation that illuminates the future of energy

A team at NREL has created a mini solar panel that converts laser light into energy. A small turning point from the many possible applications

July 24 2023
Gianluca RiccioGianluca Riccio
⚪ 3 minutes
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In the vast panorama of renewable energies, every now and then it is possible to see a solution that promises to change the way we see things. Today it's a mini solar panel that has a special trick up its sleeve: laser light.

We see photovoltaics seen in a different light

The world of photovoltaic energy is in turmoil. A team of brilliant minds from the National Renewable Energy Laboratory (NREL), an entity of the US Department of Energy, has announced a sea change.

Researchers have developed mini cells capable of operating with laser light: their research, published in the prestigious journal Solar Energy Materials and Solar Cells (I link it to you here), shows a technology that is not only innovative, but also economical. And the icing on the cake? No need for complex processes like lithography. A simple laser pattern does it all. Nice is not it?

The 'secret' ingredient of solar laser? Silicon

Just him: that mineral that we find almost everywhere on our planet. Paul Stradins, the brains behind this invention used silicon as a key component. But let's not stop here. These mini panels, with their extraordinarily low contact resistance, are perfect for operation in the scorching sun.

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And for the more technical among you, they experimented with a very thin layer of silicon dioxide around 1,5 nm (nanometers). Continuous?

Okay. They had these mini solar cells and they found they could combine them into micromodules just by stacking them. In testing, they used ten of these cells, but theoretically they could use as many as they wanted. And it doesn't end there. By exposing the panel to a laser beam of about 10.000 nm, they found that the light-to-energy conversion efficiency exceeds 40%. And the tension? Over 7V. Numbers that might seem abstract to some of you, but believe me, they are great news.

Laser
Schematic of a mini laser solar module. Image: NREL

Yes, but what's the use?

Alright, now that we understand the science behind it, let's get down to business. What is all this for? The enthusiasm of the team is palpable. Imagine being able to transfer 25W of power to a module of just 10cm^2 with a 12kW laser from a kilometer away.

The potential is immense. We're talking about wireless data transmission in special environments or powering and recharging medical implants. The potential of this technology is immense, and we can't wait to see where it takes us.

Science fiction is becoming reality before our eyes.

Tags: solar powerlaser

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