There are basically 3 types of silicon going into current solar energy systems being installed today;

Silicon Crystals: A silicon atom has a positively charged nucleus that is surrounded by negatively charged electrons. The important factor in silicon is that it has 4 outer electrons. The 4 orbiting electrons can bond to the other electrons rotating around different elements. Each silicon atom connects with 4 more silicon atoms to construct a perfect pattern, a repeating crystalline structure.

Monocrystalline Silicon: The silicon is grown as large cylinders, which are sliced into wafers that become individual solar cells.
Polycrystalline Silicon: Liquid silicon is poured into thin containers and cooled.

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