30 Apr '12, 2pm

Blackest Solar Cell to Date Absorbs 99.7% of Light

“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. Th...

Full article: http://cleantechnica.com/2012/04/30/blackest-solar-cell-t...

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