Patent ID: 9666676
Date: 2017-05-30
CPC Classifications: H01L

Claim:
1. A method for manufacturing a semiconductor device, comprising, in the order recited: (a) forming a device structure on a surface of a semiconductor substrate; (b) forming an interlayer dielectric on the surface of the semiconductor substrate so as to cover the device structure; (c) forming a contact hole that penetrates the interlayer dielectric in a depth direction; (d) forming a transition metal film on a portion of the semiconductor substrate exposed by the contact hole; (e) forming a metal film on a whole of the surface of the semiconductor substrate on a side where the transition metal film has been formed, the metal film being effective to prevent hydrogen radicals and hydrogen atoms from penetrating downward and invading the device structure; (f) forming an oxide film in a surface of the metal film, the oxide film being effective to firmly bound to the metal film and being more chemically stable than the metal film; (g) selectively removing the metal film in which the oxide film has been formed, to thereby expose the transition metal film; and (h) exposing, to a hydrogen plasma atmosphere, the semiconductor substrate in which the transition metal film and the oxide film have been exposed, to thereby cause the transition metal film to generate heat so that the transition metal film and the semiconductor substrate can react with each other due to thermal conduction from the transition metal film and thereby form an ohmic contact there between.