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Victer Chan
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Proceedings Papers
ISTFA2000, ISTFA 2000: Conference Proceedings from the 26th International Symposium for Testing and Failure Analysis, 107-115, November 12–16, 2000,
Abstract
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Abstract With the increasing complexity of packaging technology, especially Flip-chip, package failure analysts face challenges to identify failure root cause. Due to the complex construction of Flip-chip packages, the conventional failure analysis process flow needs to be enhanced. Thus, generating a bench marked failure analysis process flow specifically for Flip-chip packaged devices becomes necessary. In this paper, the failure analysis process flow for Flip-chip package devices along with different failure mechanisms will be discussed and demonstrated. For instance, even in a simple continuity-open failure, instead of cross-sectioning the device as the initial fault identification step, the process flow details how to start from non-destructive C-SAM, TDR, to destructive die removal, polishing and finally cross-sectioning.
Proceedings Papers
ISTFA2000, ISTFA 2000: Conference Proceedings from the 26th International Symposium for Testing and Failure Analysis, 141-146, November 12–16, 2000,
Abstract
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Abstract This paper describes a novel de-process flow by combining cobalt silicide / nitride wet etch with KOH electrochemical wet etch (ECW) to identify leaky gate in silicided deep sub-micron process technology. Traditionally, leaky gate identification requires direct confirmation by gate level electrical or emission detection technique. Ohtani [1] used KOH electrochemical etch application to identify nonsilicided leaky gate capacitor in DRAM without using the above confirmation. The result of the case study demonstrates the expanded application of ECW etch to both silicided 0.18um logic and SRAM devices. Voltage contrast at metal 1 to assist leaky gate localization is also proposed. By combining both techniques, the possibility for isolating gate related defects are greatly enhanced. Case studies also show the advantages of the proposed technique over conventional poly level voltage contrast in leaky gate identification especially with devices that use local interconnect and nitride liner process.