Patent ID: 6358429
Filing Date: 2002-03-19
Classification: H01L,H03H

Abstract:
A method for manufacturing an electronic device, comprising the steps of:providing a piezoelectric material substrate having a base film on a surface thereon, said base film comprising a material capable of reactive-ion etching with a fluorine-based gas, and wherein the base film contains at least one element selected form the group consisting of Si, Mo, W, B, C, S and Ta; forming a cover film comprising a material capable of reactive-ion etching with a chlorine-based gas on the base film, the cover film containing at least one element selected from the group consisting of Al, Cu, Ti, Cr, Ga, As, Sc, Nb, Ru, In, Sn, Sb, Ta and Au; forming a mask having a predetermined pattern on the cover film; etching the cover film by chlorine-based gas reactive ion etching; and etching the base film exposed by etching of the cover film by fluorine-based gas reactive ion etching.