Patent ID: 6806951
Filing Date: 2004-10-19
Classification: G01N,G03F,H01J,H01L,Y10T

Abstract:
A system configured to determine at least one characteristic of defects on at least two sides of a specimen during use, comprising:a stage configured to support the specimen during use, wherein the stage is further configured to move during use, and wherein the specimen comprises a wafer; a measurement device coupled to the stage, comprising: an illumination system configured to direct energy toward a front side an a back side of the specimen during movement of the stage; and a detection system coupled to the illumination system and configured to detect energy propagating along multiple paths from the front side of the specimen during the movement of the stage and to detect energy propagating from the back side of the specimen during the movement of the stage, wherein the measurement device is configure to generate one or more output signals responsive to the detected energy propagating along multiple paths from the front side of the specimen and the detected energy propagating from the back side of the specimen; and a processor coupled to the measurement device and configured to determine a firs characteristic of defects on the front side of the specimen from the one or more output signals during use and a second characteristic of macro defects on the back side of the specimen from the one or more output signals during use.