18 Facts About Polycrystalline silicon

Polycrystalline silicon, or multicrystalline silicon, called polysilicon, 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.

PolyPolycrystalline silicon is produced from metallurgical grade Polycrystalline silicon by a chemical purification process, called the Siemens process.

The photovoltaic industry produces upgraded metallurgical-grade Polycrystalline silicon, using metallurgical instead of chemical purification processes.

About 5 tons of polyPolycrystalline silicon is required to manufacture one 1 megawatt conventional solar modules.

In single-crystal Polycrystalline silicon, known as monocrystalline Polycrystalline silicon, the crystalline framework is homogeneous, which can be recognized by an even external colouring.

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Polycrystalline silicon is a material consisting of multiple small silicon crystals.

Semiconductor grade polycrystalline silicon is converted to single-crystal silicon – meaning that the randomly associated crystallites of silicon in polycrystalline silicon are converted to a large single crystal.

Single-crystal Polycrystalline silicon is used to manufacture most Si-based microelectronic devices.

At the component level, polyPolycrystalline silicon has long been used as the conducting gate material in MOSFET and CMOS processing technologies.

Polycrystalline silicon is the key feedstock in the crystalline silicon based photovoltaic industry and used for the production of conventional solar cells.

Monocrystalline silicon is higher priced and a more efficient semiconductor than polycrystalline as it has undergone additional recrystallization via the Czochralski method.

Critical process variables for polyPolycrystalline silicon deposition include temperature, pressure, silane concentration, and dopant concentration.

Currently, polyPolycrystalline silicon is commonly used for the conducting gate materials in semiconductor devices such as MOSFETs; however, it has potential for large-scale photovoltaic devices.

The abundance, stability, and low toxicity of Polycrystalline silicon, combined with the low cost of polyPolycrystalline silicon relative to single crystals makes this variety of material attractive for photovoltaic production.

Resistivity, mobility, and free-carrier concentration in monocrystalline Polycrystalline silicon vary with doping concentration of the single crystal Polycrystalline silicon.

Whereas the doping of polycrystalline silicon does have an effect on the resistivity, mobility, and free-carrier concentration, these properties strongly depend on the polycrystalline grain size, which is a physical parameter that the material scientist can manipulate.

Prices of polyPolycrystalline silicon are often divided into two categories, contract and spot prices, and higher purity commands higher prices.

The solar PV price survey and market research firm, PVinsights, reported that the prices of polyPolycrystalline silicon might be dragged down by lack of installation in the second half of 2011.