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What is the difference between monocrystalline silicon and polycrystalline silicon for solar panels? solar street light-liters

by:Litel Technology     2022-05-23
In the utilization of solar energy, monocrystalline silicon and polycrystalline silicon play a huge role. Although from the current point of view, in order to make solar power generation have a larger market and be accepted by the majority of consumers, it is necessary to improve the photoelectric conversion efficiency of solar cells and reduce production costs. From the current development process of international solar cells, it can be seen that its development trend is monocrystalline silicon, polycrystalline silicon, ribbon silicon, thin film materials (including microcrystalline silicon-based thin films, compound-based thin films and dye thin films), single crystal silicon, amorphous silicon, The difference between polysilicon 1. Difference between crystalline and amorphous? The solids seen in daily life are divided into two categories: amorphous and crystalline. The internal atomic arrangement of amorphous substances has no certain rules, and the fractures are also random when broken, such as plastics and glass, and substances called crystals, The shape is a natural regular polyhedron with obvious edges and corners and planes. The atoms inside are neatly arranged according to certain rules, so when they break, they are also broken according to certain planes, such as salt, crystal, etc. 2. Differences Some crystals of single crystal and polycrystal are composed of many small crystal grains. If the arrangement of crystal grains is irregular, this crystal is called polycrystal, such as metal copper and iron. But there are also crystals themselves that are a complete large grain, which are called single crystals, such as crystals and diamonds. 3 Comparison of monocrystalline silicon and polycrystalline silicon photovoltaic cells? Monocrystalline silicon cells have high cell conversion efficiency and good stability, but the cost is high. The cost of polycrystalline silicon cells is low, and the conversion efficiency is slightly lower than that of Czochralski monocrystalline silicon solar cells. Various defects in the material, such as grain boundaries, dislocations, micro-defects, and impurities carbon and oxygen in the material, as well as contamination in the process. transition metals. Introduction of monocrystalline silicon and polycrystalline silicon: 1. Monocrystalline silicon can be used for the production and deep processing of diode-level, rectifier device-level, circuit-level and solar cell-level monocrystalline products, and its follow-up products integrated circuits and semiconductor separation devices have been widely used. It is used in various fields and also occupies an important position in military electronic equipment. Today, with the rapid development of photovoltaic technology and micro-miniature semiconductor inverter technology, solar cells produced by using silicon single crystal can directly convert solar energy into light energy, realizing the beginning of the green energy revolution. The Beijing 2008 Olympic Games will take the 'Green Olympics' as an important display to the world, and the utilization of monocrystalline silicon will be a very important part. Now, foreign solar photovoltaic power plants have reached the theoretical maturity stage and are transitioning to the practical application stage. The utilization of solar silicon single crystal will be popularized all over the world, and the market demand is self-evident. Hebei Ningjin Monocrystalline Silicon Industrial Park responds to this international trend and provides monocrystalline silicon products with excellent performance and complete specifications to the world. Monocrystalline silicon products include φ3'----φ6' monocrystalline silicon round rods, sheets and square rods and sheets, which are suitable for the production needs of various semiconductor and electronic products. The product quality has passed the most advanced testing in the world. The instrument is tested to reach the world advanced level. Uses: It is the raw material for the manufacture of semiconductor silicon devices, used to make high-power rectifiers, high-power transistors, diodes, switching devices, etc. 2. Polycrystalline silicon Polycrystalline silicon is the direct raw material for the production of monocrystalline silicon, and is the basic electronic information material for semiconductor devices such as contemporary artificial intelligence, automatic control, information processing, and photoelectric conversion. Known as 'the cornerstone of the microelectronics building'. Polysilicon is a form of elemental silicon. When the molten elemental silicon solidifies under supercooling conditions, the silicon atoms are arranged into many crystal nuclei in the form of diamond lattice. If these crystal nuclei grow into crystal grains with different crystal plane orientations, these crystal grains combine to crystallize into polycrystalline silicon. . Polycrystalline silicon can be used as a raw material for pulling single crystal silicon. The difference between polycrystalline silicon and single crystal silicon is mainly manifested in physical properties. Uses: widely used in the electronics industry to manufacture semiconductor radios, tape recorders, refrigerators, color TVs, video recorders, electronic computers and other basic materials. It is obtained by chlorination of dry silicon powder and dry hydrogen chloride gas under certain conditions, followed by condensation, rectification and reduction.
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