Non-contact method for acquiring charge-voltage data on miniature test areas of semiconductor product wafers
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United States of America Patent
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Apr 10, 2007
Grant Date -
Nov 30, 2006
app pub date -
Jul 27, 2005
filing date -
May 31, 2005
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Abstract
A non-contact method is described for acquiring the accurate charge-voltage data on miniature test sites of semiconductor wafer wherein the test sites are smaller than 100 .mu.m times 100 .mu.m. The method includes recognizing the designated test site, properly aligning it, depositing a prescribed dose of ionic charge on the surface of the test site, and precise measuring of the resulting voltage change on the surface of the test site. The method further compromises measuring of the said voltage change in the dark and/or under strong illumination without interference from the laser beam employed in the Kelvin Force probe measurement of the voltage. The method enables acquiring of charge-voltage data without contacting the measured surface of the wafer and without contaminating the wafer. Thus, the measured wafer can be returned to IC fabrication line for further processing.
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