Patent ID: 7084965
Filing Date: 2006-08-01
Classification: G01N

Abstract:
1. An arrangement for inspecting wafers and recognizing epitaxial defects on unpatterned wafers, comprising: a first optical inspection device, arranged outside a production line, for examining unpatterned reference wafers, which operates using image data processing methods and serves to recognize defects on the reference wafers, wherein the reference wafers are wafers out of a production process; a scattered-light measuring instrument, arranged in the production line, that is calibrated on the basis of the reference wafers by defining at least one threshold value serving for the recognition of defects on unpatterned wafers to be inspected, and that comprises a recording device for recording the locations at which the threshold values are exceeded on a wafer to be inspected; and a second optical inspection device, arranged in the production line, which is provided for examination, only at the locations at which a threshold value exceedance was identified, of the unpatterned wafers to be inspected, and which comprises a classification device that classifies the threshold value exceedances using image data processing methods.