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Directory:Black Silicon

Lasted edited by Andrew Munsey, updated on June 14, 2016 at 8:50 pm.

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Flat silicon surfaces are normally highly reflective. This is undesirable when it comes to solar power cells made of silicon. The more light they reflect, the less they convert to electricity.

This page considers methods for turning the surface of silicon black so that it absorbs more solar energy, rather than reflecting it.

Solutions

Etching

Techniques to create nanometer pits and bumps on the silicon which end up helping to absorb light.

Laser Etching
Image:SiOnyxBlackSilicon95x95 byKevn.jpg
Latest: Directory:Solar > Directory:Black Silicon >Directory:SiOnyx' Black Silicon by Mazur - Black silicon is a material that is between 100 and 500 times more sensitive and absorbs nearly twice the visible light of regular silicon and detects infrared light that is normally invisible to silicon based devices. (PESWIki Oct. 16, 2008)
Gold Etching

Technical University of Munich

Nano World: Black silicon for solar power - Silicon surfaces rendered black by pits and bumps only nanometers or billionths of a meter large could in the future help make solar power cells more efficient. (PhysOrg June 23, 2006)

Excerpt:

: Svetoslav Koynov and his colleagues have developed a simple and fast technique that creates these textures using wet chemical processes. Their method works regardless of the crystalline structure of the silicon, its thickness, or what extra chemical additives it possesses. The fact the technique is so flexible could mean it could work on silicon surfaces that cannot handle other kinds of anti-reflection treatments, such as the silicon thin films used in advanced hybrid solar cells, Koynov suggested.

: First the researchers deposit grains of gold only nanometers large onto a flat silicon surface. Next the silicon between the areas covered by the clusters is etched away with a solution of hydrogen peroxide and hydrofluoric acid. The gold nanoparticles exhibit catalytic action, "behaving like drills into the surface," Koynov said. The areas covered by the gold form 50-to-100-nanometer-high pits on the surface while the silicon between the gold makes up the bumps. The nanoparticles are then removed with a solution of iodine and potassium iodide.

: Koynov cautioned the gold nanoparticles could react unfavorably with the semiconductors in solar cells. He added his team has experimented with using other metal nanoparticles as well, with some success.

: The researchers are currently attempting to establish an industrial partner to advance their method forward.

Plasma Etching

Typical techniques are complex, difficult to work over large surfaces and can incur damage, making large-scale production of solar power cells with them a problem.

Anti-reflective Coatings

A traditional approach has been to apply an anti-reflective coating. These reduce the amount of average reflection in the wavelengths of light solar power cells use by 85 percent to 92 percent.

Misc.

Google > Black Silicon

See also

SOLAR GENERAL:

Directory:Solar - index of resources

There was an error working with the wiki: Code[1] | News:2009:Solar | News:2006-2008:Solar

PowerPedia:Solar Energy - Encyclopedic review of history and future

Directory:Solar Energy Research and Development

Videos:Solar

Directory:Solar Problems

SOLAR MODALITIES:

Directory:Concentrated Solar Power

Directory:Solar Infrared Harvesting

Directory:Solar PhotoVoltaics

Directory:Home Generation:Solar PV

Directory:Photovoltaic Research and Development

Directory:Solar Thermal

Directory:Home Generation:Solar Heating

Directory:Thin Film Solar

Directory:Solar:Photosynthesis Imitation

Directory:Solar Paint

Directory:Dye Solar Cells

Directory:Solar Tower

Directory:Floating Solar Chimney

Directory:Space Based Solar Power

Directory:Solar Sails

Directory:Solar Windows

SOLAR INFRASTRUCTURE

Directory:Plastic Solar Cells

Directory:Silicon - more efficient uses, alternatives, methods

Directory:Black Silicon

Directory:Synchronous Solar Heliostat

Directory:Solar:Installation and Consultation

Directory:Solar:Largest

SOLAR APPLICATIONS:

Directory:Solar Applications

Directory:Solar:Chargers

Directory:Solar:Vehicles

Directory:Solar Hydrogen

Directory:Walipini Underground Greenhouses

OS:Solar Ethanol - distiller design

Directory:Energy from Roadways

Directory:Solar Pavement - black-body absorption of the asphalt

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