Patent ID: 7077727
Filing Date: 2006-07-18
Classification: C09G,C23F,H01L

Abstract:
1. A chemical-mechanical polishing process for substrates used in the microelectronics semiconductors industry comprising at least one metal layer and one insulator layer, optionally separated by a barrier layer, in which the metal layer or layers and the barrier layer or layers are subjected to friction using a polishing pad by moving the substrate with respect to the pad and by pressing the substrate against said pad, and an abrasive composition is deposited on the pad during the polishing, wherein said process is carried out in a single stage, said abrasive composition comprising: an acid aqueous suspension of individualized particles of colloidal silica, not linked to each other by siloxane bonds, having a mean particle diameter of between 5 and 20 nm, and having a concentration by weight of silica of between 1 and 10%, and an oxidizing agent, and in that the metal layer and the optional barrier layer, is or are eliminated from the surface of the insulator in order to obtain a metal and insulator surface not requiring any finishing polishing.