Patent ID: 7276434

Claim:
A method for manufacturing a semiconductor device having a semiconductor substrate with a contact hole filled by an aluminum-containing thin film, comprising the steps of: forming a silicon-containing thin film in a region having a predetermined area including the inner surface of the contact hole on the surface of the semiconductor substrate; forming an aluminum-containing thin film on the surface of the semiconductor substrate on which the silicon-containing thin film is formed; and heating the semiconductor substrate on which the aluminum-containing thin film is formed to such a temperature as to cause silicon to diffuse with respect to aluminum; wherein the semiconductor substrate is provided with a plurality of cells each including the contact hole, and the ratio of the amount of silicon contained in the silicon-containing thin film formed in the region having the predetermined area per unit cell to the amount of aluminum supplied to a unit cell in the step of forming the aluminum thin film is not less than 0.1% and not more than 2% by atomic ratio.