Patent ID: 6291030
Filing Date: 2001-09-18
Classification: H01L

Abstract:
A method for forming a metal interconnect having a plurality of metal lines and an interlayer dielectric, the method comprising:forming said metal interconnect onto a substrate;forming a first oxide layer over said metal interconnect in a process chamber, said first dielectric layer having a thickness of about 700 angstroms using a high density plasma chemical vapor deposition (HDPCVD) process having a first sputter to deposition (S/D) ratio;forming a second oxide layer in said process chamber over said first oxide layer, said second oxide layer being formed using an HDPCVD process having a second S/D ratio less than said first S/D ratio and such that air gaps are formed between the metal lines of said metal interconnect; andforming a third oxide layer in said process chamber over said second oxide layer resulting in a planar layer.