Patent ID: 6596576
Filing Date: 2003-07-22
Classification: H01L

Abstract:
A method for fabricating a semiconductor device having a gate structure comprising SiO2 and Si3N4, the method comprising:defining an active region on a substrate; forming an oxide layer on the substrate; forming a polysilicon layer on said oxide layer; forming a silicide layer on said polysilicon layer; defining the gate structure by etching the oxide layer, the polysilicon layer and the silicide layer; implanting ions into the substrate using the gate structure as a mask; depositing a first deposition layer on the substrate; positioning the substrate in a reaction chamber; providing in the reaction chamber, an energized gas comprising a nitrogen component that reacts with a portion of the first deposition layer to form a silicon oxynitride layer on the first deposition layer; providing in the reaction chamber, a deposition gas comprising a hydrogen containing gas to deposit a second deposition layer on the silicon oxynitride layer, wherein the diffusion of hydrogen into the oxide layer is substantially reduced by the silicon oxynitride layer; and etching the first and second deposition layers and the silicon oxynitride layer to form multiple spacer layers against the gate structure.