13 Feb '12, 1pm

Nanoshell "Whispering Galleries" Trap Light in Solar Cells

Nanoshell "Whispering Galleries" Trap Light in Solar Cells

A whispering gallery is a specially-designed round room that allows a whisper from a person on one end to be carried around and heard clearly by a person on the other end. Researchers at Stanford University have used that premise to create photovoltaic nanoshell structures that cause light to resonate much like sound in a whispering gallery, and let solar cells absorb more light. The researchers made these nanoshells from tiny balls of silica coated with a layer of silicon. They hollowed out the center with acid, creating an optical shell design that is not only great at letting light in, but holding it there. Associate professor of material sciences at Stanford, Yi Cui said , "The light gets trapped inside the nanoshells. It circulates round and round rather than passing through and this is very desirable for solar applications." Jie Yao /Promo image As the light circulat...

Full article: http://www.treehugger.com/solar-technology/nanoshell-whis...

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