Patent ID: 6542837
Filing Date: 2003-04-01
Classification: H01L

Abstract:
A wafer processing system in at least one clean room for processing wafers, comprising:an arrangement of a plurality of manufacturing units for performing individual manufacturing operations necessary for the processing of wafers, said manufacturing units including at least one unit applying a layer to a wafer, at least one etching unit, at least one unit performing wet chemical process, and at least one unit performing a cleaning process; a transport system for supplying the wafers to and removing the wafers from the individual manufacturing units; and a monitoring unit for monitoring the quality of wafer processing, the monitoring unit including: measuring devices arranged in respective ones of said manufacturing units for monitoring at least one process parameter on which depends a quality of manufacturing operations performed therein, and computing units associated with respective ones of said manufacturing units for obtaining process data representing the at least one process parameter generated by respective ones of said measuring devices; said measuring devices determining a time charateristic function of the at least one process parameter; said monitoring unit being adapted to derive at least one characteristic quantity from said time characteristic function of the at least one process parameter for evaluating the quality of wafer processing from the process data.