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Jaeheum Baek
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Proceedings Papers
Automated Cell Layer Counting and Marking at Target Layer of 3D NAND TEM Samples by Focused Ion Beam
ISTFA2021, ISTFA 2021: Conference Proceedings from the 47th International Symposium for Testing and Failure Analysis, 347-351, October 31–November 4, 2021,
Abstract
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This paper discusses the development of an automated cell layer counting process for preparing 3D NAND flash memory samples for TEM analysis. In an initial proof-of-concept, several line markings were inscribed on the test device in evenly spaced intervals in order to evaluate its helpfulness for a human operator. A more automated procedure was then developed in which cell layers were counted to a desired target layer starting from a reference layer set by the operator. At that point, the operator could begin preparing the TEM sample.