Silicon wafers are the main raw material for solar cell production. At present, they account for nearly 70-80% of the total cost, which belongs to large-scale transactions. Therefore, it is particularly cautious to purchase silicon wafers; if it is inadvertent, it will bring a lot to the company. Big loss. So how can we buy the corresponding grade of qualified silicon, without being deceived? The following is for reference only

The above indicators need to determine the instruments and meters such as low life tester, four-probe tester, etc., if the manufacturers do not have their own, you can commission a number of professional institutions such as the Chinese Academy of Sciences Electrician, 18, measuring institutes and other measurements.

Finally, looking at the electrical indicators, mainly the minority life and resistivity, the level of silicon is mainly determined by these two indicators. For example, the current life expectancy of A-grade single-crystal silicon chips is greater than 10μs and the resistivity is 0-6Ω.cm.

First look at the appearance, must be no cracks, no hard wounds, no holes, no breakage;

Second, look at physical indicators, physical indicators, including crystal orientation, crystal orientation deviation, type, thickness, side length, verticality, and so on. Determine the type, crystal orientation, etc. with the corresponding test equipment; measure 5 thicknesses, tolerances, side lengths and diagonal lengths and tolerances, and verticality with corresponding measuring instruments. Here is the most important aspect for the solar cell process. Silicon wafer thickness and thickness variation (TTV), because many solar cell production lines are required by the thickness of the silicon wafer, and below the minimum thickness for production, the fragmentation rate will increase, and profit will be tossed into the debris. In addition, the carbon and oxygen content is very important for the quality of silicon wafers. It must be tested. Of course, normally, these two indicators will not be a problem. If there is any problem, they will be directly reflected in the electricity mentioned later. Indicators are.

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