Effects of post-CMP cleaning on time dependent dielectric breakdown and electro-migration in porous low-kCu interconnects

Chia Lin Hsu, Dung Ching Perng, Wen Chin Lin, Kuan Ting Lu, Teng Chun Tsai, Climbing Huang, J. Y. Wu

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The influences of post Cu chemical-mechanical-polish cleaning time on time dependent dielectric breakdown (TDDB) and electro-migration (EM) are reported. Cu residue remaining on the porous-low-k (pLK) film surface between Cu lines is a significant factor in TDDB lifetime when the cleaning time is short. In contrast, a longer cleaning time generates low Cu residue on the pLK surface but results in high Cu surface roughness, which leads to TDDB degradation. For EM performance, slightly higher roughness could improve the adhesion of the dielectric barrier layer to the Cu surface, thus increasing its mean time to failure. Further increases in Cu surface roughness, caused by extended cleaning, may generate a seam in the dielectric barrier layer at the deep-recessed trench area. The seam degrades the adhesion strength of the dielectric barrier to Cu and is the initiating site of Cu migration. As a result, it significantly degrades the EM lifetime.

Original languageEnglish
Pages (from-to)H1133-H1137
JournalJournal of the Electrochemical Society
Volume158
Issue number11
DOIs
Publication statusPublished - 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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