The breakdown method of silicon core

High voltage breakdown, how many phases does it break down?

3-phase, our company is boosting 14kv breakdown, in reverse low-voltage shifting operation

Under what circumstances does low voltage breakdown usually occur? ?

Heated with plasma technology and then pressed with 6000V

The main breakdown of the silicon core of the reduction furnace is: 1. Use plasma high-voltage breakdown (using nitrogen) 2. Use halogen lamp to heat breakdown. 3. Use graphite heating rods for heating breakdown (completed with 1.2)

Regarding the silicon core breakdown method of domestic polysilicon companies, most of them use high-voltage breakdown method. This saves time and has no impact on the quality of polysilicon. Cleaning and other external heating methods will affect product quality to some extent and are troublesome. The higher the temperature of the reduction furnace, the smaller the voltage used during suppression.

Some reactors use external heaters to heat to a certain temperature of about 500°C and breakdown at low voltage (less than 2000V), but this is more troublesome.

Our company adopts high-voltage breakdown, which is very fast, relatively simple and feasible! !

Domestic electrical appliances are designed for high-voltage breakdown and low-voltage operation. Some foreign electrical appliances are designed for low-voltage breakdown, which is also very convenient. I don’t understand what Floor 7 said about using nitrogen plasma for high-voltage breakdown. If nitrogen is used for breakdown, wouldn’t the silicon core be nitrided? What's more, the furnace is usually replaced with hydrogen before pressure. I wonder how you understand the technology you mentioned? Can you explain it in detail?

Sunlight is broken down by plasma, which is different from others

What is the final reason for this post 2009-7-10 13:06 Editor The purpose of breakdown is to reduce the resistance of the silicon core and generate heat energy, which will help silicon grow better on the silicon core from other compounds in the form of reduction or decomposition. In terms of breakdown form, it is mainly divided into high-voltage and low-voltage breakdown. High voltage breakdown: Depending on the thickness and length of the silicon core, the general working voltage is between 10,000-20,000 volts ； Low voltage breakdown: Mainly through various forms of auxiliary heating, the silicon core changes from a cold almost insulator to a relatively low resistance. When the temperature inside and outside the silicon core rises to a predetermined value, low-voltage breakdown is used to make the silicon core a conductive body with resistance, so that pure silicon can better grow on the silicon core. The general operating voltage range of low-voltage breakdown is between 2000 and 6000 volts. The main reason for using such a low voltage is that auxiliary heating can provide a temperature compensation and resistance reduction relationship for the silicon core. There are also individual companies whose applications exceed this range, but generally, after auxiliary heating is used, the silicon core is broken down again, which we can generally refer to as low-voltage breakdown. Heating form: There are various heating methods nowadays. Conventional heating has the following forms:: 1. Resistance heating, but it consumes high energy. Now many companies have gradually phased out this form. ； 2. Plasma heating is a very popular heating method now. ； 3. Microwave heating, or variable frequency microwave heating, is a new form of heating. ； 4. Laser heating should be said to be a heating method with research in the future. Although it has quite good results in many fields of application at this stage, due to the high energy consumption and high initial capital investment and operating costs, it can only be used in some cutting-edge science or research and cannot be popularized in conventional enterprises. The choice of breakdown form is mainly based on their respective technical processes and applications. * Each method has its own advantages and disadvantages, and there is no way to say which one is more advanced, laborious, or complicated. In fact, there are many forms of heating. Due to time constraints, I can only briefly introduce a few for your reference.

It was explained in more detail and gave me more insight, thank you!

Our company uses halogen lamps for heating breakdown.

study* Yes, thank you for sharing

The silicon core preheating method should be determined according to the design requirements of the reactor. Do not blindly advocate this or that startup, otherwise it will be too late to regret an accident!