Patent ID: 6824697
Filing Date: 2004-11-30
Classification: B05B,H01J,Y10S

Abstract:
A method for fabricating a microelectromechanical device, comprising the steps of:a) providing a silicon substrate having first and second opposing surfaces; b) doping said first surface with a dopant of a same conductivity type as a conductivity type of said substrate; c) forming a pad oxide on said first surface; d) forming a silicon nitride film on said pad oxide; e) patterning and etching said silicon nitride film to form at least one silicon nitride contact area on said pad oxide; f) performing, after step (e), at least one intervening process step while said silicon nitride film protects said at least one silicon nitride contact area from said at least one intervening process step, wherein at least one of said at least one intervening process steps provides a thermal oxidation of said silicon substrate; g) removing, after step (f), said silicon nitride from said at least one silicon nitride contact area and removing any of said pad oxide beneath said at least one silicon nitride contact area, wherein said step of removing said silicon nitride and said pad oxide is performed as an unmasked etch by reactive ion etching, thereby forming at least one contact area on said first surface; and h) depositing a metal on said at least one contact area.