Patent ID: 6143190
Filing Date: 2000-11-07
Classification: B41J,B81B,B81C

Abstract:
A method of producing a through-hole in a silicon substrate, said method comprising the step of:(a) forming a dummy layer on the principal surface of said substrate at a location where the through-hole will be formed, wherein said dummy layer is made of a polycrystalline silicon film, said dummy layer being capable of being selectively etched without etching the material of said substrate;(b) forming a passivation layer having resistance to an etching process on said substrate such that said dummy layer is covered with said passivation layer;(c) forming an etching mask layer on the back surface of said substrate, said etching mask layer having an opening corresponding to said dummy layer;(d) etching the substrate by means of a crystal orientation-dependent anisotropic etching process until said dummy layer is exposed via said opening;(e) removing said dummy layer by etching said dummy layer from the part which has been exposed in said step of etching the substrate; and(f) partially removing said passivation layer so as to form a through-hole.