Patent ID: 6664156
Filing Date: 2003-12-16
Classification: H01L

Abstract:
A method of fabrication of L-shaped spacers in a semiconductor device, comprising the steps of:a) providing a gate structure over a substrate; b) forming a first dielectric layer over said gate structure and said substrate; said first dielectric layer formed using an atomic layer deposition process; c) forming a second dielectric layer over said first dielectric layer; said second dielectric layer formed using an atomic layer deposition process; d) forming a third dielectric layer over said second dielectric layer; said third dielectric layer formed using an atomic layer deposition process; the steps of forming said first dielectric layer, said second dielectric layer and said third dielectric layer are performed in-situ using an atomic layer chemical vapor deposition process; e) etching said third dielectric layer to form a disposable spacer on said second dielectric layer; f) anisotropically etching said second dielectric layer and said first dielectric layer using said disposable spacer as a mask to form a top and a bottom L-shaped spacer; and g) removing said disposable spacer.