
Polycrystalline silicon (or `multi-crystalline silicon`, `multi-Si`, `semi-crystalline silicon`, `poly-Si` or polysilicon) is a silicon material consisting of small crystals, also known as crystallites, giving the material its typical metal flake effect. It is used in polycrystalline silicon photovoltaics as the leading material in the pro...
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http://en.wikipedia.org/wiki/Polycrystalline_silicon

A material used to make photovoltaic cells, which consist of many crystals unlike single-crystal silicon.
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http://www.encyclo.co.uk/local/21690
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