Patent ID: 7294572
Filing Date: 2007-11-13
Classification: H01L

Abstract:
1. A method of forming a contact, comprising: providing a substrate having at least two conductive devices, wherein a spacing is located between the two conductive devices; forming a first dielectric layer over the substrate to cover the two conductive devices and fill the spacing, wherein the first dielectric layer within the spacing has a seam; forming a pothoresist layer over the first dielectric layer; performing a photolithographic process to form a patterned photoresist layer that exposes the seam in the first dielectric layer; etching a portion of the first dielectric layer using the patterned photoresist layer as a mask to form an opening so as to expand the width of the seam; removing the patterned photoresist layer; forming a second dielectric layer over the first dielectric layer to fill the opening; removing a portion of the second dielectric layer and a portion of the first dielectric layer inside the spacing until a portion of the surface of the substrate is exposed so that a contact opening is formed in a location that corresponds to the opening; and filling a conductive layer into the contact opening.