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    The secret of the Gr?tzel Cell | Tomorrow Today

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    DW (English)

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    Michael Gr?tzel took a cue from nature and built a solar cell that works according to the principle of photosynthesis. Like chlorophyll in plants, a natural dye helps the Gr?tzel cell capture the energy in sunlight. That makes the cell cheaper than the silicon variety - and enables it to be thinner and more flexible.
    Read more on http://www.dw.de/dw/episode/0,,16026417,00.html