Atomic Layer Deposition of Ruthenium with TiN Interface for Sub-10 nm Advanced Interconnects beyond Copper

Liang Gong Wen, Philippe Roussel, Olalla Varela Pedreira, Basoene Briggs, Benjamin Groven, Shibesh Dutta, Mihaela I. Popovici, Nancy Heylen, Ivan Ciofi, Kris Vanstreels, Frederik Westergaard Østerberg, Ole Hansen, Dirch Hjorth Petersen, Karl Opsomer, Christophe Detavernie, Christopher J. Wilson, Sven Van Elshocht, Kristof Croes, Jürgen Bommels, Zsolt TokeiChristoph Adelmann

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Atomic layer deposition of ruthenium is studied as a barrierless metallization solution for future sub-10 nm interconnect technology nodes. We demonstrate the void-free filling in sub-10 nm wide single damascene lines using an ALD process in combination with 2.5 angstrom of ALD TiN interface and po'stdeposition annealing. At such small dimensions, the ruthenium effective resistance depends less on the scaling than that of Cu/barrier systems. Ruthenium effective resistance potentially crosses the Cu curve at 14 and 10 nm according to the semiempirical interconnect resitance model for advanced technology nodes. These extremely scaled ruthenium lines show excellent electromigration behavior. Time-dependent dielectric breakdown measurements reveal negligible ruthenium ion drift into low-kappa dielectrics up to 200 degrees C, demonstrating that ruthenium can be used as a barrierless metallization in interconnects. These results indicate that ruthenium is highly promising as a replacement to Cu as the metallization solution for future technology nodes.
    Original languageEnglish
    JournalA C S Applied Materials and Interfaces
    Volume8
    Issue number39
    Pages (from-to)26119-26125
    Number of pages7
    ISSN1944-8244
    DOIs
    Publication statusPublished - 2016

    Keywords

    • TiN interface
    • Atomic layer deposition (ALD)
    • Beyond-Cu
    • Reliability
    • Ruthenium

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