The difference between amorphous silicon, monocrystalline silicon and polycrystalline silicon:
1. Structural composition:
1. Fundamentally complete lattice structure of the crystal. Different directions have different properties and are good semiconductor material.
2. Polycrystalline silicon is a form of elemental silicon. When molten elemental silicon solidifies under supercooled conditions, the silicon atoms are arranged in the shape of a diamond lattice to form numerous crystal nuclei. If these crystal nuclei transform into crystal grains with different crystal plane orientations, these crystal grains combine to form polycrystalline silicon. , it is a good semiconductor material. Polycrystalline silicon can be used as a raw material to extract monocrystalline silicon. The difference between polycrystalline silicon and mon siliconocrystalline is mainly reflected in physical properties. ?
3. Amorphous silicon is a semiconductor. It is a non-crystallized product during the silicon preparation process. There are many "dangling connections" within its structure, that is, there is no environment. silicon atoms. Bound electrons can generate electric current under the action of an electric field.
2. Physical properties:
In terms of mechanical properties, electrical properties, etc., the properties of amorphous silicon, polycrystalline silicon and monocrystalline silicon have in turn improved.
3. Application performance of photovoltaic cells: Under strong sunlight, crystalline solar panels can convert more than twice as much solar energy into electrical energy than amorphous solar panels, but crystalline solar panels price is more than two or tThree times more expensive than the amorphous type, and on cloudy days, the amorphous type can collect almost as much solar energy as the crystalline type.
Baidu Encyclopedia - Amorphous Silicon
Baidu Encyclopedia - Polycrystalline Silicon
Baidu Encyclopedia - Monocrystalline Silicon
I think polycrystalline silicon and monocrystalline silicon solar panels are better than polycrystalline silicon.
1. Low cost
The speed of polycrystalline silicon solar panels is generally two to three times that of monocrystalline silicon, and the voltage is more stable. The manufacturing process of polycrystalline silicon solar cells is similar to that of monocrystalline silicon solar cells. Its photoelectric conversion efficiency is about 12%, which is slightly lower than that of monocrystalline silicon solar cells. However, the material is easy to manufacturer, saves energy. and the overall production cost is low, so there is a lot of development.
2. Beautiful craftsmanship
Single crystals are arranged in an orderly manner, while polycrystalline crystals are arranged in a disorderly manner. This is mainly determined by their processing technology. produced by casting methods, which means directly pouring silicon into a crucible to melt and shape it, while single crystal adopts Siemens method to improve Czochralski. The Czochralski process is a process of reorganization of the atomic structure. To our naked eyes, the surface of monocrystalline silicon looks the same, while the surface of polycrystalline silicon appears to contain a lot of broken glass, making it sparkle.