Nanotopography removing method
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United States of America Patent
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Apr 5, 2005
Grant Date -
Aug 8, 2002
app pub date -
Feb 5, 2002
filing date -
Feb 5, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To remove nanotopography (unevenness of wavelength: 0.2 mm through 20 mm, wave height: 1 through several hundreds nm) which has already been produced on a surface of a semiconductor wafer which has been regarded as impossible to remove conventionally, a half value width of an etching profile of activated species gas is set to fall in a range equal to or smaller than a wavelength a of nanotopography and equal to or larger than a half thereof. Based on previously measured data of nanotopography, moving speed and locus of injected activated species gas along a surface of a semiconductor wafer are calculated and controlled.
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