Patent ID: 8563423
Filing Date: 2013-10-22
Classification: H01L

Abstract:
1. A method of forming a metal interconnect structure comprising: forming a fluorosilicate glass (FSG) layer having a first fluorine atomic concentration on a substrate; patterning a line trough and a via cavity within said FSG layer; forming a fluorine depleted silicate glass layer having a second fluorine atomic concentration on said fluorosilicate glass (FSG) layer, wherein said second fluorine atomic concentration is about 10% of, or less than 10% of, said first fluorine atomic concentration, and wherein said fluorine depleted silicate glass layer is formed by treating said FSG layer at said line trough and at said via cavity with plasma, wherein exposed portions of said FSG layer is converted into said fluorine depleted silicate glass layer by losing fluorine; and forming a metal line directly on said fluorine depleted silicate glass layer, wherein said metal line is spaced from said FSG layer by said fluorine depleted silicate glass layer and is embedded in said fluorine depleted silicate glass layer.