1. 
   Poly-silicon
   Most silicon chips are made of single crystal silicon, which has a very low resistance to electron flow. However, silicon can exist in different forms (just as carbon can exist in the form of diamond, graphite, soot and buckminsterfullerine). As well as single crystal silicon, other forms are Poly-s...
   Found op http://www.encyclo.co.uk/local/20173
   
   
2. 
   Polycrystalline Silicon
   A material used to make photovoltaic cells, which consist of many crystals unlike single-crystal silicon.
   Found op http://www.encyclo.co.uk/local/21690
   
   
3. 
   Polycrystalline silicon
   Polycrystalline silicon, also called polysilicon, is a material consisting of small silicon crystals. It differs from single-crystal silicon, used for electronics and solar cells, and from amorphous silicon, used for thin film devices and solar cells. ==Single crystalline vs polycrystalline silicon...
   Found op http://en.wikipedia.org/wiki/Polycrystalline_silicon
   
   

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