Patent ID: 8287747
Filing Date: 2012-10-16
Classification: B41J

Abstract:
1. A method of processing a substrate comprising the steps of: providing a silicon substrate that has an etching mask layer with an opening portion at a first surface thereof and has a plane orientation of {100} with the surface of the silicon being exposed from the opening portion; preparing a recessed portion from the first surface to a second surface, which is an opposite surface of the first surface, in the opening portion of the silicon substrate; and forming a penetration port that passes through the first surface and the second surface of the silicon substrate by executing crystalline anisotropic etching in the silicon substrate using an aqueous solution containing tetramethyl ammonium hydroxide at a ratio equal to or greater than 6 wt % and equal to or less than 14 wt %, from the recessed portion of the silicon substrate toward the second surface.