Patent ID: 6281033
Filing Date: 2001-08-28
Classification: B81B,B81C,G01P

Abstract:
A semiconductor physical quantity sensor manufacturing method using a SOI substrate composed of a silicon substrate as a first layer, an insulating layer as a second sacrifice layer formed on said first layer, and a silicon or polysilicon layer as a third layer formed on said second layer, wherein said third layer is machined to form a sensing element for sensing physical quantities and removing said second layer to form a semiconductor physical quantity sensor, said method comprising the steps of:coating said third layer with protective film;forming a sensing element by using said protective film as a mask;removing said second sacrifice layer by wet etching;substituting an etching liquid used in said wet etching with a displacement liquid;drying said sensing element by removing said displacement liquid sticking on said sensing element in a state wherein an acceleration in an opposite direction to a direction toward said first layer is applied to said sensing element; andremoving said protective film by dry etching.