Patent ID: 6784115
Filing Date: 2004-08-31
Classification: H01L,Y10S

Abstract:
A method of forming a semiconductor device comprising:providing a semiconductor substrate having a first region where a first oxide layer thickness is desired and a second region where a second oxide layer thickness is desired, wherein said first oxide layer thickness is greater than said second oxide layer thickness; introducing halogen-containing impurities into an exposed surface of said semiconductor substrate to form a higher halogen concentration in said first region than in said second region; performing an oxidizing process on said semiconductor substrate to simultaneously form said first oxide layer thickness at said first region and said second oxide layer thickness at said second region; and forming a first memory gate electrode on said second oxide layer thickness, said second oxide layer thickness formed on said semiconductor substrate in a memory region; wherein said semiconductor substrate also includes a third region where a third oxide layer thickness is desired, and wherein introducing said halogen-containing impurities also introduces halogen-containing impurities such that a different halogen concentration is formed in said third region than in said first region and in said second region.