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Physical method solar cell polysilicon
Crystal cutting-inner circle cutting process and multi-wire cutting of single crystal silicon
Yanmo Kaifang lays the foundation for the in-depth cutting of crystals, and crystal cutting is to use special equipment such as internal slicers or wire cutting to cut silicon crystals into thin slices that meet the requirements. At the same time, the silicon single crystal wafer used for device production also has certain requirements on … Read More
Physical method solar cell polysilicon
How does the grinding and squaring of crystals work?
Silicon wafer is the basic material for making crystalline silicon solar cells, and it is also the most expensive part of crystalline silicon solar cells. Wafer cutting is a key process in solar cell manufacturing. This process is used to process solid silicon ingots of monocrystalline or polycrystalline silicon. At present, a wire saw is … Read More
Physical method solar cell polysilicon
What are the problems with solar grade polysilicon?
The rapid development of solar cells has led to a tight supply of polysilicon raw materials, which makes the quality of raw materials entering the market different. Some fake and shoddy products flow into the market, and commercial disputes occur from time to time. As a result, the quality of products produced by downstream solar … Read More
Physical method solar cell polysilicon
What is magnetic field division?
It is a method to separate impurities (mainly non-metallic) by using the action of electromagnetic field. Constant magnetic field method Liquid silicon is placed in a uniform magnetic field. The electromagnetic field induction intensity B acts outward in the plane direction, and a current is applied in the direction perpendicular to the magnetic field. The … Read More
Physical method solar cell polysilicon
What is the composition of the plasma induction furnace?
(1) Induction coil and crucibleThe induction coil of the plasma induction furnace includes a heating coil and a stirring coil. Small-capacity stoves only have heating coils, while large-capacity stoves are equipped with stirring coils in addition to heating coils. The structure of the induction coil is the same as that of an ordinary induction furnace. … Read More
Physical method solar cell polysilicon
What is the plasma induction furnace melting method?
Plasma induction furnace is a combination of ordinary induction furnace and plasma arc heating device. It avoids the shortcomings of cold slag and unprotected atmosphere of ordinary induction furnace, thereby significantly improving the purification capacity of induction furnace. Plasma smelting can flexibly change the working gas, Therefore, during smelting, protective gas and reactive gas beams … Read More
Physical method solar cell polysilicon
What is the basic principle of electron beam vacuum melting?
Electron beam vacuum melting is to use the huge local energy of the electron beam (103~106W/cm3) to volatilize impurities (such as phosphorus and aluminum) whose vapor pressure is higher than that of silicon (the vapor pressure of 1700K silicon is 0.0689Pa). Additionally, localized overheating can remove oxides. The basic principle of the electron beam melting … Read More
Physical method solar cell polysilicon
What is the Czochralski method for preparing single crystal silicon?
1. Czochralski monocrystalline silicon processThe technique of growing crystals by the Czochralski method was invented by J.Czchralksi of Poland in 1917, so it is also called the Czchralksi method. In 1950, Teal and others used this technology to grow semiconductor germanium single crystal, and then he used this method to grow Czochralski monocrystalline silicon. On … Read More
Physical method solar cell polysilicon
What is a polysilicon ingot furnace?
(1) Structural composition of polysilicon ingot furnaceThe polysilicon ingot furnace is mainly composed of graphite heater, heat insulation layer, crucible and silicon material. The polysilicon production process is mainly temperature control, therefore, the structural design of the heating system of the polysilicon ingot furnace is very important. The heating methods are divided into induction heating … Read More
Physical method solar cell polysilicon
What are the main problems that need to be solved in the ingot casting method?
(1) The material of the crucibleWhen preparing cast polysilicon, in the process of raw material melting and crystalline silicon crystallization, the silicon melt and the quartz crucible are in contact for a long time, which will cause viscous effect. Due to the different thermal expansion coefficients of the two, the volume of silicon increases by … Read More