Patent ID: 7901132

Claim:
A method of identifying a crystal defect region, comprising: preparing a sample in the shape of a silicon wafer or a slice of monocrystalline silicon ingot; contaminating at least one side of the sample with metal at a contamination concentration of about 1×10 14 to 5×10 16 atoms/cm 2 , wherein the contaminating of one side of the sample with the metal comprises: HF-cleaning both sides of the sample; mounting the sample on a sample stub; applying a Cu-contaminated solution onto one side of the sample, the Cu-contaminated solution being a mixture of copper and buffered oxide etchant (BOE) solution; leaving the resulting structure as it is for a predetermined period such that one side of the sample is contaminated with the copper; clearing and washing the Cu-contaminated solution from the sample; and drying the sample; heat-treating the contaminated sample; and observing the contaminated side or the opposite side of the heat-treated sample to identify a crystal defect region.