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Supramolecular Abrasive-free System for Cu CMP

Published online by Cambridge University Press:  01 February 2011

Jason Keleher ,
Ken Rushing ,
Joe Zhao ,
Bill Wojtczak  and
Yuzhuo Li
Jason Keleher
Affiliation:
Center for Advance Materials Processing, Department of Chemistry, Clarkson University, Potsdam, NY 13699
Ken Rushing
Affiliation:
Center for Advance Materials Processing, Department of Chemistry, Clarkson University, Potsdam, NY 13699
Joe Zhao
Affiliation:
Center for Advance Materials Processing, Department of Chemistry, Clarkson University, Potsdam, NY 13699
Bill Wojtczak
Affiliation:
SACHEM, 821 East Woodward, Austin, Texas 78704
Yuzhuo Li
Affiliation:
Center for Advance Materials Processing, Department of Chemistry, Clarkson University, Potsdam, NY 13699
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Abstract

Key issues in CMP today include reduction of surface defectivity and enhancement of planarization efficiency. More specifically, the polished surface should be free of defects such as scratches, pits, corrosion spots, trench copper loss, and residue particles. For copper/low k CMP, one of the most promising strategies to accomplishing these goals is an Abrasive-Free Process (AFP). By eliminating abrasive particles from the process, either free or fixed to the pad, it has been anticipated and realized that defects such as severe scratching, particle contamination and slurry instability via particle aggregation or settling will be significantly reduced. In addition, with proper formulation, an abrasive free process can also yield an excellent over polishing window and desired step function of pressure for material removal rate. Coupled with a supramolecular design, some of the characteristic advantages seen in abrasive containing system such as step height reduction efficiency can be realized without the side effects often introduced from solid particles. In this presentation, some designing principles for an abrasive free system will be first presented. The potential advantages of a supramolecular design for copper CMP will be illustrated. The CMP performance on a set of testing blanket and patterned wafers will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 767: Symposium F – Chemical-Mechanical Planarization , 2003 , F6.1
Copyright
Copyright © Materials Research Society 2003

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