Automatic defect classification (adc) reclassification engine

Abstract

A method of determining classification codes for defects occurring in semiconductor manufacturing processes and for storing the information used to determine the classification codes. A wafer is selected from a production lot after the lot is sent through a first manufacturing process. The selected wafer is scanned to determine if there are defects on the wafer. Images of selected defects are examined and a numerical value is assigned to each of N elemental descriptor terms describing each defect. A classification code is determined for each defect based upon the numerical values assigned to the N elemental descriptor terms. The classification code and numerical values assigned to the N elemental descriptor terms are stored in a database. The wafer is sent through each sequential process and classification codes are assigned to additional defects selected after each sequential process. The classification codes and numerical values assigned to the N elemental descriptor terms for the additional selected defects are stored in the database. The stored numerical values assigned to the N elemental descriptor terms to modify the classification code. All of the defects stored in the database are assigned new classification codes in accordance with the modified classification code. A new classification code can be generated and all of the stored defects are assigned new classification codes in accordance with the new database.