Apparatus and method for controlling implant process
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United States of America Patent
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Aug 22, 2017
Grant Date -
Oct 27, 2016
app pub date -
Apr 18, 2016
filing date -
Apr 23, 2015
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Abstract
An apparatus includes a beam scanner applying, during a non-uniform scanning mode, a plurality of different waveforms generating a scan of an ion beam along a scan direction, wherein a given waveform comprises a plurality of scan segments, wherein a first scan segment comprises a first scan rate and a second scan segment comprises a second scan rate different from the first scan rate; a current detector intercepting the ion beam outside of a substrate region and recording a measured integrated current of the ion beam for a given waveform; and a scan adjustment component coupled to the beam scanner and comprising logic to determine: when a beam width of the ion beam along the scan direction exceeds a threshold; and a plurality of current ratios based on the measured integrated current of the ion beam for at least two different waveforms of the plurality of waveforms.
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