Patent ID: 8642420
Filing Date: 2014-02-04
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device structure, the method comprising: forming a first gate structure and a second gate structure overlying a semiconductor material, the first gate structure having a first silicon nitride cap overlying a first polysilicon gate element, and the second gate structure having a second silicon nitride cap overlying a second polysilicon gate element; forming a layer of oxide material overlying the first gate structure and the second gate structure, resulting in a first covered gate structure and a second covered gate structure; forming an ion implantation mask overlying the second covered gate structure, while the first covered gate structure remains exposed; subjecting the first covered gate structure to a tilted ion implantation procedure, while the ion implantation mask inhibits ion implantation at the second covered gate structure, resulting in an implanted device structure; after completing the tilted ion implantation procedure, removing the ion implantation mask, wherein the layer of oxide material protects the first gate structure and the second gate structure during removal of the ion implantation mask; after removing the ion implantation mask, completely removing the layer of oxide material to expose the first gate structure and the second gate structure; thereafter, preparing the implanted device structure for epitaxial material formation by forming a layer of silicon nitride material overlying the exposed first gate structure and the exposed second gate structure, and by creating sidewall spacers for the first gate structure, the sidewall spacers created by etching the layer of silicon nitride material; and thereafter, forming regions of epitaxial semiconductor material corresponding to source and drain regions for the first gate structure.