Determining instantaneous removal rates in metal chemical mechanical planarization

Ricky Philipossian, Yasa Sampurno, Ara Philipossian

Research output: Contribution to journalArticle

Abstract

We define a new scientific method, based on experimental and simulation data, for accurately determining instantaneous removal rates (i-RRs) during tungsten and copper chemical mechanical planarization. We show that i-RR changes tremendously depending on how different factors that account for RR are affected by key process parameters that change due to depth-dependent non-uniformities in film morphology, density and elemental composition. After experimentally determining how pad temperature, coefficient of friction (COF), sliding velocity and polishing pressure affect overall RRs, we use a modified Langmuir-Hinshelwood model and show that i-RR for tungsten is governed by COF and not by temperature, while i-RR for copper is a strong function of temperature, and to a lesser extent, a function of COF.

Original languageEnglish (US)
Article numberSL0803
JournalJapanese Journal of Applied Physics
Volume59
Issue numberSL
DOIs
StatePublished - Jul 1 2020

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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