Quality analysis of polysilicon
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Is there a more precise method for quality analysis of polysilicon raw material TCS? We can only detect 0.1 ppm here
It generally reaches the PPBW level, right? The PPM level is probably produced by specialized TCS manufacturers. The analysis accuracy for polysilicon companies must reach PPBa
What you’re saying is too general; purity should be expressed as a percentage with two decimal places. There are more than a dozen types of impurities such as B, P, Fe, Al, Ca, Cu, Zn, Ni, Mg, Pb, Ti, Cr, Ge, etc., and all of these can be analyzed accurately. Many manufacturers both domestically and internationally have achieved an analysis precision of less than 5 ppt. The original poster measured 0.1 ppm – is he still working with polysilicon? Even if polysilicon is produced, it is likely not on a large scale; more efforts are still needed!
We can all measure in ppb, but the accuracy remains to be confirmed. Hehe.
Reply to 4# qingshuang: For materials used in normal crude and refined distillation as well as those purchased, ICP testing is carried out first; if nothing is detected, then ICP-MS testing is used. The material that goes through reduction after distillation needs to be analyzed using ICP-MS. ICP detects levels above 1 ppb, while ICP-MS detects levels below 1 ppb. . The issue that needs to be resolved at present is the problem of detecting P using ICP-MS; if accurate detection is possible, it will be of great help for process control.
The molecular weight of phosphorus-31 shows a significant error in measurements, and the analysis results are quite ambiguous.
In fact, analysis requires strict regulations regarding sampling and sample preparation; such low concentrations make contamination likely
In fact, analysis requires strict regulations regarding sampling and sample preparation; such low concentrations make contamination likely
Currently, domestic tests usually indicate several ppb levels, but these are all estimates. The most accurate source is a laboratory in the United States, but the process is extensive and very complex.
Ningxia Polysilicon Analysis Technology Group: 119267012
Normally, BBP is used, but due to the high sensitivity of the instruments, impurities can easily be introduced during sampling and injection, resulting in errors