Patent ID: 7994036
Filing Date: 2011-08-09
Classification: H01L

Abstract:
1. A fabrication method for a semiconductor device, comprising the steps of: (a) forming an insulating film and a first electrode film sequentially in this order on the entire surface of a semiconductor substrate having a first region and a second region; (b) removing a portion of the first electrode film formed on the first region; (c) forming a first cap film containing a first element over the semiconductor substrate and thereafter subjecting the resultant substrate to heat treatment after the step (b), to allow the first element to diffuse into a portion of the insulating film formed on the first region and at least a top portion of the first electrode film; (d) forming a second electrode film over the semiconductor substrate after the step (c); and (e) etching at least the second electrode film and the insulating film, to form a first gate insulating film including the insulating film with the first element diffused therein and a first gate electrode including the second electrode film on the first region, and form a second gate insulating film including the insulating film and a second gate electrode including the second electrode film on the second region.