What are the preparation processes of Zzolab pull monocrystalline silicon?

The preparation process of Zorgi-pull monocrystalline silicon generally includes the preparation of raw materials, and the selection of crucibles should be used in the selection of additives. The seed crystals and seed crystals are oriented, and the molten silicon seeds in the furnace are reduced and put in the room. Equal diameter closing and decommissioning phases.

On March 12, the 50GW Zhila monocrystalline silicon rod project of Qinghai Gaojing Photovoltaic Technology Industrial Park started in Nanchuan Industrial Park, Xining. The total investment of 18 billion yuan in Nanchuan Industrial Park, Qinghai Gaojing Solar Energy Technology **** Photovoltaic Technology Industrial Park 50GW Straight Pull Monocrystalline Silicon Rod Project is the province's largest industrial single investment in recent years, the most advanced technology of high-quality industrial projects, after the project is fully put into production, in terms of technology, quality, scale, cost and other aspects are the world's leading level, compared with the existing counterparts with all-round strength into the first echelon, will effectively drive the whole industrial chain of photovoltaic new energy, Help Qinghai accelerate the cultivation of a 100-billion-level new energy industrial cluster, and inject new momentum into the accelerated development of the photovoltaic industry.

The Management Committee of Nanchuan Industrial Park will take this start as an opportunity to do a good job in attracting investment to strengthen, supplement and extend the chain with the advantages of the province's rich "green electricity" and the construction of the power LAN in Nanchuan Industrial Park. At the same time, the park management committee will continue to enhance Qinghai's strategic position in the national new energy industry layout with the goal of "carbon peak in 2030 and carbon neutrality in 2060", as well as the target task of reaching more than 1.2 billion kilowatts in wind and solar power generation by 2030, and inject new vitality into Qinghai's real economy to become bigger, better and stronger.

The person in charge of the Management Committee of Nanchuan Industrial Park said that the park will continue to implement the major requirements of "four solid", vigorously implement the strategy of "one excellent and two high", strive to create "five demonstration provinces", and strive to build two tens of millions of kilowatts of renewable new energy development bases, understand the new discovery stage, implement the new development concept, build a new development pattern, promote high-quality development, continue to enhance the service awareness of the park, carry forward the spirit of "three cows", and be willing to serve the "second shop" of the enterprise. At the same time, the management committee of the park will continue to deepen the new industrial development idea of "3+2+1" in the park with the goal of building a modern industrial system and new urbanization. Among them, "3" is:

Play the three cards of Qinghai's "source", Qinghai's "light", and Qinghai's "green"; "2" is: "two excellent", continue to optimize and reorganize the Tibetan carpet velvet textile industry, and continue to give preferential treatment to consolidate small and micro enterprises; "1" means: vigorously develop the modern service industry, and forge ahead in the direction of building a new type of urbanization with industry-city integration.

In addition, the management committee of the park will implement the mechanism of key projects to ensure key projects, promote development with high quality, high speed and high efficiency, make a good start for the economic development of the park during the "14th Five-Year Plan", take a good step, and present the 100th anniversary of the founding of the Communist Party of China with the strong aura and excellent achievements of "Thanksgiving and Forge Ahead, Strive to Catch Up", and make new and greater contributions to the construction of a modern, beautiful and happy Xining.

The Straight-pull method uses the principle of condensation and crystallization driving of the melt, and at the solid-liquid interface, the melt temperature drops, which will produce a phase change from liquid to solid.

First of all, we should understand the four basic concepts, crystalline, amorphous, monocrystalline, and polycrystalline. The principle of preparing monocrystalline silicon by the straight-pull method: the polycrystalline silicon is heated by the thermal field and melted into a molten state, the liquid surface temperature is controlled at the critical point of crystallization by controlling the thermal field, and the monocrystalline seed crystal above the liquid surface is lifted upward from the liquid surface, and the dissolved silicon rises with the lifting of the seed crystal and grows a monocrystalline silicon wafer according to the crystal direction of the seed crystal.

A single crystal of silicon. A crystal with a largely intact lattice structure. Different directions have the property of non-dissipation, and it is a good semiconducting material.

Purity is required to be almost 100 percent, or even more. It is used in the manufacture of semiconductor devices, solar cells, etc. It is made of high-purity polysilicon drawn in a monocrystalline furnace.

First of all, we should understand the four basic concepts, crystalline, amorphous, monocrystalline, and polycrystalline. The principle of preparing monocrystalline silicon by the straight-pull method: the polycrystalline silicon is heated by the thermal field and melted into a molten state, the liquid surface temperature is controlled at the critical point of crystallization by controlling the thermal field, and the spinal cultivation is lifted from the liquid surface through the single crystal seed crystal of the liquid surface, and the dissolved silicon rises with the lifting of the seed crystal and grows a single crystal silicon wafer according to the crystal direction of the seed crystal.

A single crystal of silicon. A crystal with a largely intact lattice structure. Different directions have different properties, and it is the only good semiconducting material next to the good cherry blossom.

Purity is required to be almost 100 percent, or even more. It is used in the manufacture of semiconductor devices, solar cells, etc. It is made of high-purity polysilicon drawn in a monocrystalline furnace.

1. Stone processing.

At the beginning is the stone, (the stone contains silicon), the stone is heated, it becomes a liquid state, and it becomes a gaseous state in the heating, and the gas passes through a sealed box, and there are n more than n crystals in the box to heat, and the two ends are sandwiched with graphite.

2. Pickling.

Of course, there are still a lot of waste gases or something, (silicon tetrachloride) is produced in the production process, it seems that it is not possible to deal with this thing very well, not much nonsense, the original polycrystalline has it, and it starts pickling, hydrogen acid, nitric acid, acetic acid or something to clean the things outside the original polycrystalline, and dry it in the drying room, and check and pack it without dust.

3. Crystal pulling. Sent to the crystal pulling, the crystal pulling is to use the crystal pulling furnace to heat and melt the polysilicon, in the use of the subcrystalline crystal upward pull, the worker first put the polysilicon into the quartz pot, (in order to reduce the cost, the factory will also use some washed cells, broken silicon wafers melt together) close the furnace heating, the melting point of the quartz pot is 1700 degrees, the melting point of the silicon is only about 1410 degrees, after melting the silicon, the quartz pot slowly turns up, the subcrystals descend from above, point to the center of the liquid surface point of the pot, and slowly turn in the opposite direction, the bottom of the pot is heated by electricity at the same time, and the liquid surface is cooled. When the sub-crystal point reaches the liquid surface, there will be a point of light, slowly rotate, pull upward, put the shoulder, turn the shoulder, pull the rod normally, and finish, about a day and a half, a single crystal rod will come out.

4. Cut squares. The single crystal rod is generally made of 6 inches, p-type, resistivity ohms (one inch is equal to about centimeters) cut off the four sides of the rod, make a chamfered square, in the slicing, millimeter piece.