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Modelling of dishing for metal chemical mechanical polishing

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5 Author(s)
Nguyen, V.H. ; MESA+Res. Inst., Twente Univ., Enschede, Netherlands ; Van Der Velden, P. ; Daamen, R. ; Van Kranenburg, H.
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In this paper, a physical model for the development of dishing during metal chemical mechanical polishing (CMP) is proposed. The main assumption of the model is that material removal occurs predominantly at the pad/wafer contacts. The distribution of pad/wafer contact size is studied first. This distribution is used as an input for a model of the dependence for the material removal rate on the line width. A relation that describes the development of dishing as a function of overpolish time will be presented. The model describes to a great accuracy the observed dishing effects, using one free parameter.

Published in:

Electron Devices Meeting, 2000. IEDM '00. Technical Digest. International

Date of Conference:

10-13 Dec. 2000

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