Polycrystalline silicon

Polycrystalline silicon is a form of elemental silicon. When molten elemental silicon solidifies under
supercooling conditions, the silicon atoms are arranged in the form of a diamond lattice to form many
crystal nuclei. If these crystal nuclei grow into crystal grains with different crystal plane orientations,these
crystal grains combine to form polycrystalline silicon. . Utilization value: The development trend of solar
cells can be seen from the current development process of international solar cells.

Polycrystalline silicon can be used as raw material for pulling single crystal silicon. The difference between
polycrystalline silicon and single crystal silicon is mainly reflected in the physical properties. For example,
the anisotropy of mechanical properties, optical properties and thermal properties is far less obvious than
that of single crystal silicon; in terms of electrical properties, the conductivity of polycrystalline silicon
crystal is also far less significant than that of single crystal silicon, and even has almost no conductivity.
In terms of chemical activity, the difference between the two is minimal. Polycrystalline silicon and
monocrystalline silicon can be distinguished by their appearance, but the real identification requires
analysis to determine the crystal plane direction, conductivity type and resistivity of the crystal.