Clean Power solar cell black silicon

Published on April 30th, 2012 | by Zachary Shahan


Blackest Solar Cell to Date Absorbs 99.7% of Light

April 30th, 2012 by  


Natcore Tech and National Renewable Energy Lab (NREL) scientists have created the “blackest” solar cell to date, a black silicon solar cell that absorbs an incredible 99.7% of the light that hits its surface. “Today’s solar cells absorb about 95 percent of the sun’s radiation,” NREL notes.

NREL actually holds the record for a black silicon solar cell — 18.6% — “but they had to make it using a passivation technology that requires thermal oxidation,” Natcore notes. “Natcore will replace that cumbersome step with its LPD oxide process.”

solar cell black silicon

With a very low reflectance (average of 0.3%), Natcore’s black solar cells perform about as well in cloudy weather as sunny weather, a significant advantage. The company has now received signed a Cooperative Research & Development Agreement with NREL, which will investment $150,000 in this project. The goals of the agreement are that Natcore and NREL work together to:

  1. Reduce solar cell costs by 2%-3%, and;
  2. Increase solar panel energy output from 3% to 10% over the course of a day without the aid of a solar tracking mechanism.

“These goals would be accomplished by combining Natcore’s patented liquid phase deposition (LPD) technology with NREL’s technologies for creating a black silicon antireflective layer integrated into high-efficiency solar cells…. The combination of the two technologies could significantly exceed NREL’s record cell efficiency.”

Currently, the agreement is for one year. Hopefully, in that time, or soon after, Natcore and NREL will be able to significantly improve the solar cell efficiency of black silicon cells. That could mean big things in the solar cell industry.

“This technology will play an important role in moving forward the availability of solar technologies,” NREL Vice President for Commercialization & Technology Transfer William Farris said. “It is one more step to help bolster the Department of Energy’s SunShot Initiative to make solar energy cost competitive with other forms of energy by the end of the decade.”

“Our technology will create a new American industry,” says Natcore President and CEO Chuck Provini. “We’ve been trying for two years to get financial support from the Department of Energy. This is a meaningful first step.”

We’ll see.

In the meantime, here’s a little more from Natcore on what “black silicon” is:

“Black silicon” refers to the apparent color of the surface of a silicon wafer after it has been etched with nano-scale pores. The etching takes place in a matter of a few minutes in a liquid solution at room temperature; the black color is not a color at all but results from the absence of reflected light from the porous wafer surface.

A panel made from black silicon solar cells will produce a significantly greater amount of energy (KwHrs) on a daily basis than will a panel made from cells using the industry standard thin film coating, not only because the reflectance is lower but also because the angular dependence of the reflectance from black silicon is much lower as well. The latter fact means a black silicon panel will perform better during the morning and afternoon hours when the sun hits at an angle and will also outperform standard cell panels on cloudy days. The combination of lower cost and higher energy output per kilowatt of installed array peak power should quickly make black silicon the antireflection control technology of choice in the industry.

h/t TreeHugger
Images: © Natcore Technology

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About the Author

is tryin' to help society help itself (and other species) with the power of the typed word. He spends most of his time here on CleanTechnica as its director and chief editor, but he's also the president of Important Media and the director/founder of EV Obsession, Solar Love, and Bikocity. Zach is recognized globally as a solar energy, electric car, and energy storage expert. Zach has long-term investments in TSLA, FSLR, SPWR, SEDG, & ABB — after years of covering solar and EVs, he simply has a lot of faith in these particular companies and feels like they are good cleantech companies to invest in.

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  • Dcard88

    It seems there are dozens of new technology improvements that will all come together and possibly end up with panels close to the 25% efficiency range with lower cost than todays cheapest 15% panels.

    • Yeah, so many approaches being pursued. Costs have been rolling down hill for years now, but it looks like they’re still quite a ways from the bottom.

  • rkt9

    Zach, thanks for publishing this article, I have been following Natcore for a couple of years now, and I am very excited about their technology and patents. They also have plans for tandem solar cells, and eventually quantum dot cells. In case any one is interested, Natcore is a publicly traded company. NTCXF.PK or NTX on the Toronto exchange.

    • Thanks. Yeah, certainly looks like a company to watch.

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