Patent ID: 9676193
Date: 2017-06-13
CPC Classifications: B41J,H01L

Claim:
1. A substrate processing method, comprising: forming a first hole from a first surface of a silicon substrate into a silicon part of the silicon substrate so that the first hole has a depth so that the first hole does not extend through the silicon substrate; and forming a second hole from a second surface, which opposes the first surface, into the silicon part of the silicon substrate by performing dry etching so as to reach the first hole and communicate with the first hole, so that a through hole, which is formed of the first hole and the second hole, is formed in the silicon substrate, wherein the through hole has a shape such that at least a portion of an opening end of the first hole is present within the second hole when the second surface is viewed in plan, and wherein the forming of the second hole includes forming a communication portion, which is wider than an opening at the first surface of the first hole, after the second hole has been made to communicate with the first hole by the dry etching, wherein the communication portion replaces a portion of the first hole that is located at a depth range adjacent to the bottom of the first hole where the second hole has been made to communicate with the first hole, and the communication portion is formed by widening said portion of the first hole, wherein, after the second hole is made to communicate with the first hole, original etching conditions for forming the second hole are changed to new etching conditions, so that an edge portion of a side wall of the first hole, which is continuous with the second hole, is removed by etching using the new etching conditions, to form the communication portion.