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New Solar Cells Capture Double the Amount of Energy from the Sun

Scientists at GW School of Engineering and Applied Science develop a prototype solar panel that captures nearly double the amount of energy from light.

(CLIVE VARLEY)

A lot of people are excited about solar energy, and with good reason: It's clean, renewable, and as manufacturing capabilities ramp up, an increasingly realistic way to power our world. On April 30th, 2017, Germany met 85% of its power needs from renewable energy sources including solar panels. Still, solar cells currently capture only about 25% of the available solar energy. Now a team from GW School of Engineering and Applied Science has produced a remarkably designed solar cell that collects nearly half of it. It's been believed that the upper limit for the efficiency of conventional solar cells is about 30%, so this could be a big deal.

Scientists at GW School of Engineering and Applied Science have designed a multi-layered, stacked cell that operates as a sort of “solar sieve." Each layer grabs a portion of the light spectrum as sunlight passes through on its way to the next layer down.

As lead author of the just-published research Matthew Lumb explains, “Around 99 percent of the power contained in direct sunlight reaching the surface of Earth falls between wavelengths of 250nm (Editor's note: nm = nanometers) and 2500nm, but conventional materials for high-efficiency multi-junction solar cells cannot capture this entire spectral range. Our new device is able to unlock the energy stored in the long-wavelength photons, which are lost in conventional solar cells, and therefore provides a pathway to realizing the ultimate multi-junction solar cell."

The GW team's solar cell works with concentrator photovoltaic panels that focus sunlight onto micro-scale solar cells of about one millimeter square. Being so small opens up the possibilities for using them in sophisticated structures that can eventually be manufactured at a reasonable cost.

Aside from its stacking aspect, the GW solar cell incorporates a couple of other innovative touches.

What allows a GW panel to collect longer wavelengths is a material more commonly used with infrared lasers and photodetectors called gallium antimonide (GaSb). Cells made of this complement standard high-efficiency solar cells grown on conventional substrates.

The manner in which the GW solar cell is constructed is also a bit different. Its layers are stacked with extreme precision using a method called “transfer printing" that allows tiny three-dimensional structures to be assembled.

The GW solar cell is a one-off built to demonstrate the potential for far greater efficiency in solar energy collection. The technology it introduces is currently too expensive for cost-effective manufacture. But solar cells that are twice as effective at capturing energy from the sun? Sign us up for that.

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Map of the World's Countries Rearranged by Population

China moves to Russia and India takes over Canada. The Swiss get Bangladesh, the Bangladeshi India. And the U.S.? It stays where it is. 

Strange Maps

What if the world were rearranged so that the inhabitants of the country with the largest population would move to the country with the largest area? And the second-largest population would migrate to the second-largest country, and so on?

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Virgin Galactic uses space tech to create new supersonic jet

The space tourism company Virgin Galactic teams up with Rolls Royce to create a new Mach 3 supersonic aircraft.

New supersonic aircraft from Virgin Galactic.

Credit: Virgin Galactic
Technology & Innovation
  • Richard Branson's Virgin Galactic announces a partnership with Rolls Royce.
  • The space tourism company will create a new supersonic jet for super-fast travel on Earth.
  • The aircraft will travel at Mach 3 – three times the speed of sound.
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Hulu's original movie "Palm Springs" is the comedy we needed this summer

Andy Samberg and Cristin Milioti get stuck in an infinite wedding time loop.

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  • Two wedding guests discover they're trapped in an infinite time loop, waking up in Palm Springs over and over and over.
  • As the reality of their situation sets in, Nyles and Sarah decide to enjoy the repetitive awakenings.
  • The film is perfectly timed for a world sheltering at home during a pandemic.
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