Patent ID: 7332447

Claim:
A fabrication method of a contact, the method comprising: providing a substrate having at least two metal oxide semiconductor devices already formed thereon, wherein the two metal oxide semiconductor devices comprise a gap therebetween; forming a first stress layer over the substrate to cover the two metal oxide semiconductors, wherein the first stress layer is formed by: forming a stress material layer over the substrate to cover the two metal oxide semiconductor devices and to fill the gap, wherein the stress material layer inside the gap comprises a seam; and performing an etching process to remove a portion of the stress material layer inside the gap to expand a width of the seam; forming a second stress layer on the first stress layer; forming a dielectric layer on the second stress layer; removing a portion of the dielectric layer, a portion of the first stress layer and a portion of the second stress layer inside the gap to expose a portion of a surface of the substrate to form a contact opening; and filling a conductive layer in the contact opening.