Patent ID: 6417069
Filing Date: 2002-07-09
Classification: H01L

Abstract:
A processing method of using an anodizing apparatus in which a conductive partition is inserted between a cathode and an anode and electrically connected to said anode, placing a substrate between said cathode and said conductive partition, and forming a porous layer on the substrate by an anodizing reaction, comprising:the preparation step of bringing said cathode and a substrate to be processed into electrical contact with each other through a first electrolyte and bringing said conductive partition and the substrate into electrical contact with each other through a second electrolyte; and the anodizing step of flowing a current between said cathode and said anode to form a porous layer on a surface of the substrate on said cathode side, wherein an electrolyte capable of forming a porous structure on the substrate is used as the first electrolyte, and an electrolyte substantially incapable of forming a porous structure on said conductive partition is used as the second electrolyte.