Patent ID: 7303973

Claim:
A method for manufacturing a semiconductor device, comprising a dual-stage deposition step comprising: a first stage for introducing a material gas containing an oxide of a desired metal into a reaction chamber in which a semiconductor substrate on a surface of which a metal film is formed in part or in entirety is placed to thus form an oxide film made of said desired metal by a vapor-phase growth method and, after completion of the first stage, a following second stage for removing from said reaction chamber said material gas introduced into said reaction chamber at said first stage and a byproduct produced at said first stage, wherein said semiconductor substrate has a cylindrical trench on a surface thereof, wherein said metal oxide film as an oxide of said specified metal is formed on said semiconductor substrate including regions on a bottom and an inner side wall of said cylindrical trench, by repeating said dual-stage deposition step two or more times, and wherein when said metal oxide film is completely formed, said semiconductor substrate is annealed.