Patent ID: 7262103

Claim:
A method for forming salicide in a semiconductor device, the method comprising the steps of: (1) forming a first gate oxide film and a second gate oxide film in a non-salicide region and a salicide region of a silicon substrate, respectively, the first gate oxide film being thicker than the second gate oxide film; (2) forming a conductive layer on an upper surface of a first resultant structure obtained through step (1), and then selectively removing the conductive layer, the first gate oxide film, and the second gate oxide film, thereby forming gate electrodes respectively in the non-salicide region and the salicide region and simultaneously exposing an active region of the salicide region; (3) forming an ONO thin film and a nitride film on an upper surface of a second resultant structure which has been obtained through steps (1) to (2) and includes the gate electrodes; (4) selectively removing the ONO thin film and the nitride film located in the salicide region; (5) removing the nitride film remaining in the salicide region and forming a spacer on one side of each of the gate electrodes; and (6) forming a salicide film on the upper surfaces of the gate electrodes in the non-salicide region and the salicide region and on the surface of the active region in the salicide region.