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Journal Articles Microelectronics Reliability Year : 2015

Electromigration-induced failure in operando characterization of 3D interconnects: microstructure influence

Abstract

An accurate knowledge of the phenomenon is required to develop a predictive modeling of the electromigration failure. Thus, a hitherto unseen SEM in operando observation method is devised. The test structure with “high density” through silicon vias (TSV) is tested at 623 K with an injected current density of 1 MA/cm2. Regular shots of micrographs inform about the voids nucleation, forced in copper lines above the TSV, and about the scenario of their evolution. A clear relation is established between voids evolution and the one of the electrical resistance. The lack of impact of test conditions on the failure mechanism is demonstrated. Finally, the impact of microstructure on the depletion mechanism is discussed. Grain boundaries are preferential voids nucleation sites and influence the voids evolution. A probable effect of grain size and crystallographic orientation is revealed.
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Dates and versions

hal-01166314 , version 1 (22-06-2015)

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Simon Gousseau, Stéphane Moreau, David Bouchu, Alexis Farcy, Pierre Montmitonnet, et al.. Electromigration-induced failure in operando characterization of 3D interconnects: microstructure influence. Microelectronics Reliability, 2015, 55 (8), pp.1205-1213. ⟨10.1016/j.microrel.2015.05.019⟩. ⟨hal-01166314⟩
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