Mr. Richard Tomasco Profile

Richard Tomasco

Senior Development Engineer at Hewlett-Packard Co

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Proceedings Article | 10 May 2005 Paper

Information server test case: the effects of probe current stability on CD-SEM measurement

Susan Redmond, Ron Weller, Richard Tomasco, Bill Keese, Nick Spaniola, Tatsuya Maeda, Kenichi Takenouchi, Lorena Page, Alex Danilevsky, Roger Williams, Daniel Berger, Brandon Ward

Proceedings Volume 5752, (2005) https://doi.org/10.1117/12.599062

KEYWORDS: Scanning electron microscopy, Metrology, Optical alignment, Edge detection, Objectives, Local area networks, Silicon, Modulation, Semiconductor manufacturing, Environmental monitoring

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There are many factors to consider when monitoring the stability of CD-SEM tools in the semiconductor manufacturing environment. With decreasing feature size and high aspect ratio dimensions, metrology tool calibration, stability, monitoring and matching play a more significant role in obtaining consistent CD measurements. It is not easy to separate the cause of outlier CD measurements. Tool owners need to consider all possible factors when matching across toolsets. For example, the tool should demonstrate repeatable electrical beam alignments in order to minimize the contribution of CD-SEM drift to measurement error. In order to overcome error in CD measurement caused by CD-SEM tool drift, it is important to monitor critical tool parameters that can produce shifts in CD measurements. Probe current is a critical CD-SEM parameter that affects CD measurement precision. Drifts in probe current can be the result of instabilities in the emission current, accumulation of contamination on the objective aperture, or misalignment of the SEM optics. Since measurement precision is impacted by drifts in probe current, Hitachi and HP began monitoring probe current on HP’s S9000 CD-SEMs in an effort to understand Ip drift effect on CD measurements. HP and Hitachi utilized an Information Server system, which was developed by Hitachi High Technologies America, Inc., to facilitate data collection. Information server is a web-based program which will archive and monitor many parameters of Hitachi CD-SEM tools. Hitachi Applications Engineers worked with HP Metrology Engineering to put the capability in place. In this paper, we will address probe current instability and its impact on CD measurements. We will explore the relationship between probe current, CD data, and errors in pattern recognition caused by probe current and alignment drift.

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