Patent ID: 7482256
Filing Date: 2009-01-27
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising steps of: forming a gate structure in which a gate oxide film, a gate, a first buffer layer and a hard mask layer are sequentially deposited on a semiconductor substrate; forming a second buffer layer of a same material as the first buffer layer on the entire surface of the semiconductor substrate so as to cover a top surface and side surfaces of the gate structure; forming a spacer above the second buffer layer on sides of the gate structure without removing a part of the second buffer layer; forming an insulating layer on the entire surface of the semiconductor substrate including the second buffer layer; planarizing the insulating layer sufficiently to remove a first portion of the second buffer layer and expose the hard mask layer; removing the exposed hard mask layer and a portion of the spacer; selectively removing a portion of the first buffer layer exposed by the removal of the hard mask layer and a second portion of the second buffer layer to expose the top surface and the upper side surface of the gate and form an opening between the gate and the spacer; and forming a metal silicide layer on the exposed top and upper side surfaces of the gate in the opening.