Patent ID: 7332104

Claim:
A CMP slurry comprising: a first colloidal particle having a primary particle diameter ranging from 5 nm to 30 nm and an average particle diameter of d 1 , the first colloidal particle being incorporated in an amount of w 1 by weight; and a second colloidal particle having a primary particle diameter larger than that of the first colloidal particle and an average particle diameter of d 2 , the second colloidal particle being formed of the same material as that of the first colloidal particle and incorporated in an amount of w 2 by weight; wherein d 1 , d 2 , w 1 and w 2 are selected to concurrently meet following conditions (A) and (B) excluding situations where d 1 , d 2 , w 1 and w 2 concurrently meet following conditions (C) and (D): 3 ≦d 2 /d 1≦8 (A) 0.7 ≦w 1/( w 1 +w 2)≦0.97 (B) 3 ≦d 2 /d 1≦5 (C) 0.7 ≦w 1/( w 1 +w 2)≦0.9 (D).