Understanding Multi Scale Pad Effects in Chemical Mechanical Planarization

Abstract

A multi-physics model encompassing chemical dissolution and mechanical abrasion effects in CMP is developed. This augments a previously developed multi-scale model accounting for both pad response and slurry behavior evolution. The augmented model is utilized to predict scratch propensity in a CMP process. The pad response delineates the interplay between the local particle level deformation and the cell level bending of the pad. The slurry agglomerates in the diffusion limited agglomeration (DLA) or reaction limited agglomeration (RLA) regime. Various nano-scale slurry properties significantly influence the spatial and temporal modulation of the material removal rate (MRR) and scratch generation characteristics. The model predictions are first validated against experimental observations. A parametric study is then undertaken. Such physically based models can be utilized to optimize slurry and pad designs to control the depth of generated scratches and their frequency of occurrence per unit area.

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Correspondence to Abhijit Chandra.

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Chandra, A., Bastawros, A.F. & Karra, P.K. Understanding Multi Scale Pad Effects in Chemical Mechanical Planarization. MRS Online Proceedings Library 1157, 201 (2008). https://doi.org/10.1557/PROC-1157-E02-01

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