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This paper demonstrates the first reliable and low cost airgap BEOL technology, generated at extremely tight dimensions (48 nm pitch) in Cu/ULK. This provides 20% nested-line capacitance reduction relative to the ungapped Cu/ULK baseline. This result is of critical importance, as it validates that airgaps can be extended down to ultrafine wire levels, such as for the 10 nm technology node. Current...
Electromigration and resistivity of Cu, Co and Ru on-chip interconnection have been investigated. A similar resistivity size effect increase was observed in Cu, Co, and Ru. The effect of liners and cap, e.g. Ta, Co, Ru and SiCxNyHz, on Cu/interface resistivity was not found to be significant. Multilevel Cu, Co or Ru back-end-of-line interconnects were fabricated using 10 nm node technology wafer processing...
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