METHODS FOR ACQUIRING PLANAR VIEW STEM IMAGES OF DEVICE STRUCTURES
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United States of America Patent
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Nov 21, 2019
app pub date -
Jul 30, 2019
filing date -
Jul 30, 2019
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Abstract
A method of preparing a sample that includes milling an initial deep lamella within a wafer using a focused ion beam. The initial deep lamella includes at least one internal structure within an upper portion of the initial deep lamella. The method further includes lifting the initial deep lamella out of the wafer, placing the initial deep lamella on an upper surface of the wafer on a lateral side of the initial lamella, milling a planar shallow lamella out of a portion of the initial deep lamella and the wafer beneath the initial deep lamella to include at least substantially an entire length of the at least one internal structure of the initial deep lamella, lifting the planar shallow lamella out of the wafer, and placing the planar shallow lamella on a carbon grid.
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