Patent ID: 6960525
Filing Date: 2005-11-01
Classification: H01L

Abstract:
1. A method of forming a metal plug, comprising: providing a semiconductor substrate; forming a dielectric layer on the semiconductor substrate; forming a patterned hard mask on the dielectric layer; etching the dielectric layer to form a contact hole in the dielectric layer using the patterned hard mask as a shield so as to expose parts of the semiconductor substrate; forming an isolated layer on the patterned hard mask, wherein the isolated layer prevents the patterned hard mask from siliciding; conformally forming a barrier layer on the isolated layer and the exposed substrate of the contact hole; forming a metal layer to fill the contact hole and cover the barrier layer; performing a thermal treatment to form a product between the metal barrier layer and the semiconductor substrate; and removing parts of the metal layer, barrier layer, isolated layer, and patterned hard mask so as to form a metal plug in the contact holes.