Patent ID: 8039964
Filing Date: 2011-10-18
Classification: H01L

Abstract:
1. A metal interconnect structure comprising: a fluorosilicate glass (FSG) layer having a first fluorine atomic concentration and located on a substrate; a fluorine depleted silicate glass layer having a second fluorine atomic concentration and located on a recessed portion of, and on top of, said FSG layer and including an upper horizontal portion contacting a topmost horizontal surface of said FSG layer, wherein said second fluorine atomic concentration is about 10% of, or less than 10% of, said first fluorine atomic concentration; and a metal line abutting and embedded within said fluorine depleted silicate glass layer, wherein said metal line is separated from said FSG layer by said fluorine depleted silicate glass layer, wherein a top surface of said upper horizontal portion is coplanar with a top surface of said metal line.