Patent ID: 6444138
Filing Date: 2002-09-03
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) forming first and second silicon oxide layers on said first and second surfaces of said substrate, respectively; c) coating a first photoresist layer on said first silicon oxide layer; d) defining a first pattern on said first photoresist layer; e) transferring said first pattern onto said first silicon oxide layer using dry etching; f) removing said first photoresist layer; g) coating a second photoresist layer on said first silicon oxide layer; h) defining a second pattern on said second photoresist layer, wherein said second pattern includes said first pattern as a subset, whereby said first pattern is not occluded by said second photoresist layer; i) dry etching, after the step of defining said second pattern, said first pattern into said silicon substrate for a first period of time; j) transferring said second pattern onto said first silicon oxide layer using dry etching; and k) dry etching simultaneously, after the step of transferring said second pattern, said first and second patterns for a second period of time, such that the planar dimensions of said first pattern and said second pattern are reproduced in said silicon substrate.