Patent ID: 6380106
Filing Date: 2002-04-30
Classification: H01L

Abstract:
A method of fabrication of a conductive line structure having an air gap between the conductive lines; comprising the steps of:a) forming spaced conductive lines over a semiconductor structure; said spaced conductive lines have top surfaces; b) forming a filler material over said spaced conductive lines and said semiconductor structure; said filler material is formed so that said top surfaces of said spaced conductive lines are exposed; said filler material is comprised of a material selected from the group consisting of polypropylene glycol (PPG), polybutadine (PB) polyethylene glycol (PEG), and polycaprolactone diol (PCL) and is formed by a spin on process; c) forming a permeable dielectric layer over said filler material and said top surfaces of said spaced conductive lines; said permeable dielectric layer has a property of allowing said filler material in a vapor phase, to diffuse through; said permeable dielectric layer is deposited using a high density plasma chemical vapor deposition (HDPCVD) process and uses a Si-containing gas and is performed at a temperature between 325 and 375Â° C.; d) vaporizing said filler material changing the filler material into a vapor phase filler material; said vapor phase filler material diffusing through said permeable dielectric layer to form a gap between said spaced conductive lines; and e) depositing an insulating layer over said permeable dielectric layer wherein steps (c) through (e) are performed insitu in a HDPCVD chamber.