Polycrystalline silicon is the direct raw material for the production of monocrystalline silicon. It is a single crystal of silicon with basically complete lattice structure. So what is the difference between monocrystalline silicon and polycrystalline silicon? Next, let's learn the difference between monocrystalline silicon and polycrystalline silicon.
Polysilicon is a form of monocrystalline silicon. When molten simple silicon solidifies under supercooling conditions, silicon atoms are arranged into many crystal nuclei in the form of diamond lattice. If these crystal nuclei grow into grains with different orientations of crystal planes, these grains combine to form polycrystalline silicon.
A small amount of group IIIA elements are added to the monocrystalline silicon to form a p-type semiconductor. A small amount of Group VA elements are added to form an n-type semiconductor. When n-type and p-type semiconductors are combined, they can be made into solar cells to convert radiant energy into electrical energy. Polycrystalline silicon can be used as raw material for drawing monocrystalline silicon. The difference between polycrystalline silicon and monocrystalline silicon is mainly reflected in Physics
Monocrystalline silicon has two types of isomorphism, crystalline and amorphous. Crystalline silicon is further divided into monocrystalline silicon and polycrystalline silicon, both of which have diamond lattice. The crystal is hard and brittle, has metallic luster, and is conductive, but its conductivity is not as good as that of metal, increases with temperature, and has semiconductor characteristics.
Monocrystalline silicon is an indispensable basic material in modern science and technology, such as electronic computers and automatic control systems in daily life. Televisions, computers, refrigerators, telephones, watches and automobiles are all inseparable from monocrystalline silicon materials. As one of the popular materials for technology application, monocrystalline silicon has penetrated into every corner of people's life.
Polysilicon is a form of elemental silicon. When molten element silicon solidifies under supercooling conditions, silicon atoms are arranged into multiple crystal nuclei in the form of diamond lattice. If the nuclei grow into grains with different crystal orientations, the grains combine and crystallize into polysilicon.
Polycrystalline silicon can be used as raw material for drawing monocrystalline silicon. The difference between polycrystalline silicon and monocrystalline silicon is mainly reflected in physical properties. For example, in terms of anisotropy of mechanical, optical and thermal properties, it is less obvious than monocrystalline silicon; In terms of electrical properties, the conductivity of polysilicon crystal is much lower than that of monocrystalline silicon, and even the conductivity is very poor.
In terms of chemical activity, the difference between the two is very small. Polycrystalline silicon and monocrystalline silicon can be distinguished from each other in appearance, but the real identification must be determined by analyzing the crystal plane orientation, conductivity type and resistivity. Monocrystalline silicon cells have high conversion efficiency and good stability, but the cost is high.