Patent ID: 7776761
Filing Date: 2010-08-17
Classification: H01L,Y10S

Abstract:
1. A method of fabricating a semiconductor device, comprising: preparing a semiconductor substrate having a first active region, a second active region and a third active region; forming a mask layer formed of an inorganic material on the first, second and third active regions; forming a photoresist pattern on the mask layer on the second and third active regions; forming a mask layer pattern on the second and third active regions by removing the mask layer from the first active region using the photoresist pattern as an etching mask; removing the photoresist pattern; growing a first oxidation retarding layer on the first active region with the mask layer pattern present on the second and third active regions by performing a first nitridation-treating of the first, second and third active regions of the semiconductor substrate; forming a residual mask layer pattern remaining on the third active region by removing the mask layer pattern from the second active region; growing a second oxidation retarding layer on the second active region, and further growing the first oxidation retarding layer, wherein the growing of the second oxidation retarding layer on the second active region and the further growing of the first oxidation retarding layer are performed simultaneously with the residual mask layer pattern present on the third active region by performing a second nitridation-treating of the first, second and third active regions of the semiconductor substrate; removing the residual mask layer pattern from the third active region; and growing a silicon oxide layer on the semiconductor substrate having the first and second oxidation retarding layers to form gate insulating layers having different thicknesses from one another on the first, second and third active regions.