Variation of the Lifetime of Interconnections Due to the Crystallinity of Grain Boundaries in Thin-Film Interconnections

Ryota Mizuno, Yutaro Nakoshi, Ken Suzuki, Hideo Miura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The crystallinity of the fine interconnections was evaluated quantitatively by using electron back-scatter diffraction (EBSD) analysis The image quality (IQ) value, the average sharpness of Kikuchi pattern obtained from the analysis was applied to the quantitative evaluation of the quality of grains and grain boundaries in polycrystalline metalic thin-film interconnections. It was found that the main degradation path under high current density was along porous grain bundaries in the polycrystalline materials, and therefore, the effective lifetime due to electromigration varied drastivally depending on the volume ratio of the grain boundaries with low crystallinity in the interconnections. The crystallinity of fine interconnections varied depending on their fabrication process and their thermal hystory after the fabrication. In the case of electroplating, it was found to be important to control the lattice mismatch between the electroplated thin film and the substrate material used for the electroplating. The effective lifetime of copper interconnection varied about 100 times as a strong function of the crystallinity.

Original languageEnglish
Title of host publicationEMAP 2018 - 2018 20th International Conference on Electronic Materials and Packaging
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538656426
DOIs
Publication statusPublished - 2019 Mar 5
Event20th International Conference on Electronic Materials and Packaging, EMAP 2018 - Clear Water Bay, Hong Kong
Duration: 2018 Dec 172018 Dec 20

Publication series

NameEMAP 2018 - 2018 20th International Conference on Electronic Materials and Packaging

Conference

Conference20th International Conference on Electronic Materials and Packaging, EMAP 2018
Country/TerritoryHong Kong
CityClear Water Bay
Period18/12/1718/12/20

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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