Patent ID: 6835640
Filing Date: 2004-12-28
Classification: H01L

Abstract:
A method of forming composite insulator spacers on the sides of conductive gate structures, on a semiconductor substrate, comprising the steps of:growing a gate insulator layer on said semiconductor substrate; forming conductive gate structures on said gate insulator layer; depositing a first insulator layer; depositing a second insulator layer; performing a first phase of an anisotropic dry etch procedure to form second insulator spacer components on said first insulator layer, with said first phase of said anisotropic dry etching procedure selectively terminating on said first insulator layer; and performing a second phase of said anisotropic dry etch procedure wherein the etch rate ratio of said first insulator layer to said second insulator layer is between about 1.5 to 1, to 20 to 1, and the etch rate ratio of said first insulator layer to said semiconductor substrate is between about 3 to 1, to 100 to 1, to form first insulator spacer components, resulting in definition of said composite insulator spacers located on sides of said conductive gate structure with said composite insulator spacers comprised of said second insulator spacer components overlying said first insulator spacer components.