Patent ID: 7074635
Filing Date: 2006-07-11
Classification: B81C

Abstract:
1. A method for fabricating a MEMS structure having a movable portion movable relative to a stationary portion, comprising the steps of: providing a wafer substrate having an oxide film disposed between upper and lower silicon layers thereof; patterning a photoresist mask on the upper surface of the wafer substrate; first dry etching the wafer substrate by using a first dry etching gas to expose the oxide film so as to form a plurality of etched holes on the upper silicon layer; removing the oxide film externally exposed at the bottom surface of the etched holes by a second dry etching using a second dry etching gas while vapor depositing polymer protective layers on the inner circumferences of the etched holes; forming a floating space in which floatable movement of the movable portion is permitted, by third dry etching the lower silicon layer exposed through the bottom surface of the etched holes from which the oxide film was removed, using a third dry etching gas; and removing the photoresist mask remaining on the upper surface of the wafer substrate and the polymer protective layers vapor deposited on the etched holes.