Patent ID: 7811926
Filing Date: 2010-10-12
Classification: H01L,Y10T

Abstract:
1. A process for damage-free patterning of at least one organosilicate glass interlevel dielectric (OSG ILD) comprising: forming a structure comprising a multilayer hardmask on a surface of an OSG ILD, said multilayer hardmask comprising an organic material layer, and a first Si-containing inorganic material layer located atop the organic material layer, wherein said first Si-containing inorganic layer comprises a stack of at least an oxide overlayer and a nitride underlayer; forming a first opening defining a partial line pattern in said oxide overlayer, wherein said first opening exposes a portion of said nitride underlayer; conditioning the exposed portion of said nitride underlayer to prevent resist poisoning; forming a second opening defining a via pattern through said exposed portion of the nitride underlayer, said organic material layer and a portion of said OSG ILD; completing the line pattern by removing said nitride overlayer, said organic material layer, and a portion of said OSG ILD that is adjacent to said via pattern; deepening the via pattern through said OSG ILD; and filling said via and line patterns within said OSG ILD with at least a conductive material.