Silicon cored square ingot manufacturing process capable of preventing pot sticking and ingot breakage

Abstract

The invention relates to a silicon cored square ingot manufacturing process capable of preventing pot sticking and ingot breakage. The process comprises the following steps: step I, spraying onto a crucible; step II, preparing a material and then loading the well prepared silicon material into the strip-shaped crucible; step III, carrying out vacuum-pumping operation to a furnace body before ingotheating, and continuously introducing argon gas into the furnace body for protection in heating and crystal growing processes, wherein the argon gas admission velocity in silicon material heating andmelting process is 30L / min, and the argon gas admission velocity in the crystal growing process is 20 L / min; step IV, annealing; step 5, discharging and demoulding. According to the silicon cored square ingot manufacturing process provided by the invention, a liquid level position of the molten silicon material inside the crucible is coated with a first silicon nitride coating through a hairbrush, the compactness of the coating is improved greatly by compared with that of a heat spraying way, silicon material melting heat convection impact can be effectively resisted, and coating falling offwhich causes silicon ingot sticking pot and ingot breakage can be effectively prevented.

Description

technical field [0001] The invention relates to a silicon core square ingot manufacturing process for breaking an ingot in an anti-stick pot, and belongs to the technical field of polysilicon production. Background technique [0002] In recent years, with the increasing maturity of solar power generation technology, solar cells have been widely used in many fields such as industry, agriculture and aerospace. At present, according to the different materials used, solar cells can be divided into: silicon solar cells, compound thin film solar cells and polymer multilayer modified electrode solar cells, organic solar cells and nanocrystalline solar cells. Among them, the development of silicon solar cells is the most mature and occupies a dominant position in the application. Crystalline silicon solar cells are further divided into monocrystalline silicon solar cells and polycrystalline silicon solar cells. Compared with monocrystalline silicon solar cells, the preparation pro...

AI Technical Summary

Problems solved by technology

The above reaction between silica and molten silicon causes the silicon to adhere to the crucible, and due to the difference in thermal expansion coefficient between the two materials, silica and silicon, the ingot is prone to cracking as it cools

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