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Proceedings Paper

Investigation of smart inspection of critical layer reticles using additional designer data to determine defect significance
Author(s): William Waters Volk; Carl Hess; Wayne Ruch; Zongchang Yu; Weimin Ma; Lisa Fisher; Carl Vickery; Z. Mark Ma
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Paper Abstract

With expected implementation of low k1 lithography on 193nm scanners for 65nm node wafer production, high resolution defect inspection will be needed to insure reticle quality and reticle manufacture process monitoring. Reticle cost and reticle defectivity are both increasing with each shrink to the next node. Simultaneously, system on chip (SoC) designs are increasing in which a large area of the exposure field typically contains dummy patterns and other features which are not electrically active. Knowing which defects will electrically impact device yield and performance can improve reticle manufacturing yield and cycle time -- resulting in lower reticle costs. This investigation examines the feasibility of using additional design data layers for die-to-database reticle inspection to determine in real time the relevance of a reticle defect by its location in the device (Smart InspectionTM). The impact to data preparation and inspection throughput is evaluated. The current prototype algorithm is built on the XPA and XPE die-to-database algorithms for chrome-on-glass and EPSM reticles, respectively. The algorithms implement variable sensitivity based on the additional design data regions. During defect review the defects are intelligently binned into the different predetermined design regions. Tests show the new Smart Inspection algorithm provides the capability of using higher than normal sensitivity in critical regions while reducing sensitivity in less critical regions to filter total defect counts and allow for the review of just defects that matter. Performance characterization of a variable sensitivity Smart Inspection algorithm is discussed in addition to the filtering of the total defect count during review to show the defects that matter to device performance. Using seven critical layer production reticles from a system on chip device we examine the applications of Smart Inspection by layer including active, poly, contact, metal and via layers. Data volume for additional data layers show little impact to inspection data prep time. The total area of the reticle where defects do not matter is as high as 70% on some layers. Review capabilities will be examined for various applications such as reviewing defects in the various regions such as SRAM, dummy pattern, and redundant contact/via specified regions. Lastly, the economics of Smart Inspection will be modeled using the collected knowledge of the applications from the production reticle characterized in this investigation.

Paper Details

Date Published: 17 December 2003
PDF: 11 pages
Proc. SPIE 5256, 23rd Annual BACUS Symposium on Photomask Technology, (17 December 2003); doi: 10.1117/12.518071
Show Author Affiliations
William Waters Volk, KLA-Tencor Corp. (United States)
Carl Hess, KLA-Tencor Corp. (United States)
Wayne Ruch, KLA-Tencor Corp. (United States)
Zongchang Yu, KLA-Tencor Corp. (United States)
Weimin Ma, KLA-Tencor Corp. (United States)
Lisa Fisher, Texas Instruments Inc. (United States)
Carl Vickery, Texas Instruments Inc. (United States)
Z. Mark Ma, Texas Instruments Inc. (United States)

Published in SPIE Proceedings Vol. 5256:
23rd Annual BACUS Symposium on Photomask Technology
Kurt R. Kimmel; Wolfgang Staud, Editor(s)

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