I was an engineer who worked in a semiconductor clean room. Wafers check all the impurities. The presence of impurities is equivalent to the low yield per wafer. The wafer will be released after the test is finished. If the wafer is defective, you can go to another factory. If there are many defective wafers in the semiconductor factory, the company will not have many customers.
2020 BRN Discussion, page-7627
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