1 June 1992 Advanced in-line process control of defects
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A variety of techniques are currently in use for process monitoring and control of wafer quality during production. In general these techniques fall into two categories: (1) particle monitors that provide fast, simple results but are limited in visibility to many defects, and (2) more advanced systems that monitor a much larger class of potential problems but require significant analysis time and interpretation of results. The first category has traditionally been used for in-line monitoring, while the second category has served primarily for engineering analysis and R&D applications. Recent technical developments, in particular the development of advanced systems based on optical pattern filtering, have begun to blur the distinction between in-line and engineering analysis tools. This paper establishes performance guidelines for in-line process monitoring tools, reviews the current techniques utilized against these guidelines, and discusses the potential applications of these methods to in-line process control. Systems based on these new techniques hold the promise of providing sophisticated analysis capability for in-line process control applications, by offering extremely high throughput (in the range of a few minutes per wafer) and high sensitivity (0.20 micrometers and better), combined with intelligent but fully automated analysis of the data to provide `single-number' reports on production wafers.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Michael Slama, Marylyn Hoy Bennett, and Peter W. Fletcher "Advanced in-line process control of defects", Proc. SPIE 1673, Integrated Circuit Metrology, Inspection, and Process Control VI, (1 June 1992); doi: 10.1117/12.59808; https://doi.org/10.1117/12.59808

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