The Millennium Technology Prize trophy, named “Peak,” features a silicon tip. Back in 1991, Professor Michael Graetzel from the Lausanne Polytechnic invented what’s now called the Graetzel Cell , a non-photovoltaic solar cell made of a layer of titanium dioxide, glass and a dye from fruit that absorbs sunlight like the chlorophyll in green leaves. The Swiss professor has since continued deve… Read the full story on TreeHugger
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Unplugged: Organic and Affordable Solar Power
