Stock code 834770 Tel:4007-573-002
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inspection

editor:Realization method: Silicon wafer is floated above chemical reagent and oxidized strongly by nitric acid on nitrite surface. │ Release time:2018-06-26 

Purpose: Eliminate abnormal silicon wafers to ensure product quality.

Electrical testing: resistivity; thickness / TTV; conductivity type; minority life.

Optical inspection: size; verticality; chipping; surface stains; cracks; holes