The square silicon cores often experience silicon core delamination
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I would like to ask everyone: (1) After each drawing process, silicon core peeling tends to occur at the base of the silicon rod, and there is also more or less earthy-yellowish-black substance on the square silicon core. What exactly is going on? (2) Personally, I think it is amorphous silicon; if it is indeed amorphous silicon, then what is the cause of that? (3) If, on its own, it is the lower temperature that causes this issue, then for square silicon cores compared to round silicon cores, their resistance values are quite similar; so with the same current and the same operating conditions, why do some experience the situation described above while others do not? (4) Is there no way to avoid or solve it?
I would like to ask everyone: (1) After each drawing process, silicon core peeling tends to occur at the base of the silicon rod, and there is also more or less earthy-yellowish-black substance on the square silicon core. What exactly is going on? (2) Personally, I think it is amorphous silicon; if it is indeed amorphous silicon, then what is the cause of that? (3) If, on its own, it is the lower temperature that causes this issue, then for square silicon cores compared to round silicon cores, their resistance values are quite similar; so with the same current and the same operating conditions, why do some experience the situation described above while others do not? (4) Is there no way to avoid or solve it?
Jiangyin Dongsheng – could it be related to silicon cores?
You need to adjust the air-to-fuel molar ratio; Wacker in Germany has also used square silicon cores, and they have a set of adjustment methods
(1) Is the silicon material dense at the location where the silicon core is peeled off? This situation may occur if the lower part is not densely packed; in addition to the mixing ratio mentioned above, it’s also necessary to check whether the nozzle and air intake volume can be adjusted. One possible reason for the earthy-yellow color of the silicon core after it comes out of the furnace is an issue with the cleaning process; another possibility is nitridation that occurs during operation. It is recommended that you examine the relevant steps in the process, particularly the cleaning and furnace-startup replacement processes. (2) There are various reasons for the formation of amorphous silicon, mainly related to the ratio of feed gases and the temperature inside the furnace. (3) Regarding the influence of temperature, I believe that whether amorphous silicon is formed has little to do with whether the silicon core is round or square; this is just my personal opinion. The roundness or squareness of the silicon core has a close relationship with the success rate of starting the furnace.
(1) The location where the silicon material is stripped is at the base of the silicon rod, and the silicon material is very dense； Is the issue with the clear process you mentioned silicon core cleaning? (The square silicon cores we purchased) Also, as you mentioned nitrogenization, but we start the furnace using hydrogen – there is no nitrogen; instead, we use recycled hydrogen, which contains trace amounts of N2. (2) Additionally, there is another type with a grayish substance on the surface of the silicon core, which cannot be corroded by HF solution. (3) Can amorphous silicon be corroded by HF? (4) If there is a small amount of oxygen or water in the furnace before it is started up, can the dew point still be within the acceptable range?
May I ask how to determine whether the blackish-yellow substance on the surface of the silicon core at the root of the silicon rod is amorphous silicon? How do you know it is amorphous silicon? Is the H2 you use pure H2 or recycled H2?
Will HCl in cycle H cause oxidation of the silicon core?
Are there any studies or literature abroad on abnormalities in silicon cores? ? ?