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Polycrystalline Silicon, or multicrystalline silicon, also called polysilicon, poly-Si, electronic grade (eg) polysilicon, silicon polycrystal, poly-Si, or mc-Si,  is a high purity, polycrystalline form of silicon, used as a raw material by the solar photovoltaic and electronics industry.
Polysilicon consists of small crystals, also known as crystallites, giving the material its typical metal flake effect. While polysilicon and multisilicon are often used as synonyms, multicrystalline usually refers to crystals larger than one millimetre.
The polysilicon feedstock – large rods, usually broken into chunks of specific sizes and packaged in clean rooms before shipment – is directly cast into multicrystalline ingots or submitted to a recrystallization process to grow single crystal boules. The boules are then sliced into thin silicon wafers and used for the production of solar cells, integrated circuits and other semiconductor devices.
Polycrystalline Silicon for solar energy applications includes p-type and n-type silicon. Most silicon-based PV solar cells are produced from polycrystalline silicon with single crystal systems the next most common. Silicon Metal is also available as single crystal, amorphous silicon, disc, granules, ingot, pellets, pieces, powder , rod, sputtering target, wire, and other forms and custom shapes. Ultra high purity and high purity forms also include submicron powder and nanoscale powder.
Single-crystal silicon (also called monocrystalline) is the most common type of silicon. Single-crystal silicon has no grain boundaries and a homogeneous structure.

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