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Xu Liu
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Proceedings Papers
ISTFA2011, ISTFA 2011: Conference Proceedings from the 37th International Symposium for Testing and Failure Analysis, 393-395, November 13–17, 2011,
Abstract
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Abstract A NOR-type split gate embedded Flash memory product program marginal fail with odd/even word line failure pattern. Based on cell current comparison, programming cycling tests and voltage drop measurements, the invisible cause of even/odd cells weak program failure mechanism was verified and confirmed visibly by cross sectioning and junction stain treatment. This problem was then solved by tightening photo alignment control and exposure conditions.
Proceedings Papers
ISTFA2002, ISTFA 2002: Conference Proceedings from the 28th International Symposium for Testing and Failure Analysis, 245-249, November 3–7, 2002,
Abstract
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Abstract Locating the defect site in current devices is complicated by their density and size. Voltage contrast (VC) imaging and backscattered electron (BSE) imaging are non-destructive beam-based location techniques. We can locate the defect to single poly line, contact and via by combining EMMI, LC, layout and bit map address information. Some reliability failure analysis cases are presented to demonstrate the effectiveness of the beam-based techniques. VC imaging and BSE imaging are used to locate the defect site precisely. The subsequent steps include deprocess and precision FIB cut for sample preparation. SEM or TEM is then used to identify failures caused by gate oxide pinhole, contact junction leakage, high butted contact resistance or tungsten residue.