Patent ID: 6117741
Filing Date: 2000-09-12
Classification: H01L

Abstract:
A method of forming a sidewall gate structure, comprising the steps of:forming a primary insulation layer adjacent a semiconductor substrate, the semiconductor substrate comprising a first and second doped region separated by a channel region;forming a disposable gate covering a portion of the primary insulation layer proximate the channel region of the semiconductor substrate;forming a sidewall insulation body adjacent to the disposable gate, the sidewall insulation body comprising a silicon oxynitride material;removing the primary insulation layer proximate the first and second doped regions of the semiconductor substrate to expose a portion of the semiconductor substrate;forming an epitaxial layer on the exposed portion of the semiconductor substrate;forming a buffer layer adjacent the epitaxial layer, at least a portion of the disposable gate exposed in the buffer layer;removing the disposable gate to expose a portion of the primary insulation layer proximate the channel region of the semiconductor substrate;removing the exposed portion of the primary insulation layer to expose a channel portion of the semiconductor substrate, the primary insulation layer selectively removable relative to the buffer layer;forming a gate insulator on the exposed channel portion of the semiconductor substrate; andforming a gate adjacent the gate insulator.