Patent ID: 6703322
Filing Date: 2004-03-09
Classification: H01L,Y10S

Abstract:
A method of forming multiple oxide layers with different thicknesses comprising:providing a semiconductor substrate comprising a silicon surface with a first region and a second region; forming a sacrificial oxide layer on the silicon surface to cover both the first region and the second region; forming a mask layer comprising a first opening with a first predetermined surface area in portions of the mask layer within the first region, and multiple second openings, each second opening having a second predetermined surface area, in portions of the mask layer within the second region, on the surface of the sacrificial oxide layer to respectively expose portions of the sacrificial oxide layer having a surface area equal to the first predetermined surface area, and portions of the sacrificial oxide layer, each having a surface area equal to the second predetermined surface area; performing a linear nitrogen doping process to simultaneously implant nitrogen ions with a first predetermined concentration and nitrogen ions with a second predetermined concentration into the first region and the second region, respectively, through the first opening and the second opening, respectively; removing the mask layer; removing the sacrificial oxide layer; and performing an oxidation process to form a first silicon oxide layer having a first predetermined thickness, and a second silicon oxide layer having a second predetermined thickness, in the first and second regions, respectively.