Patent ID: 7736530
Filing Date: 2010-06-15
Classification: C09G,H01L

Abstract:
1. A CMP slurry comprising: a CMP mixture containing abrasive particles, water, and an anionically charged graft-type polymer acid having a weight-average molecular weight of 3,000-15,000 and comprising a backbone and a side chain, or a mixture of an anionically charged linear polymer acid having a weight-average molecular weight of 2,000-50,000 and an anionically charged graft-type polymer acid having a weight-average molecular weight of 1,000-20,000 and comprising a backbone and a side chain, as an additive, wherein the CMP mixture has a first viscosity; and a viscosity decreasing compound having a weight-average molecular weight of 30-500 and containing a hydroxyl group (OH), a carboxyl group (COOH), or both, wherein the viscosity decreasing compound is added to the CMP mixture, such that the CMP slurry has a viscosity 5-30% lower than the first viscosity and is in a range of 1.1-1.9 cPs.