Patent ID: 8492281
Filing Date: 2013-07-23
Classification: B41J,C09K,H01L

Abstract:
1. A method of producing a silicon substrate, the method comprising: preparing a silicon substrate on which a silicon oxide film formed with an opening is formed on at least one surface of the substrate; and etching the substrate from the opening by using a liquid composition containing cesium hydroxide, an alkaline organic compound including tetramethylammonium hydroxide, and water as an etching solution and using the oxide film as a mask to form a through-port penetrating through the substrate, wherein a ratio by weight of the cesium hydroxide to the weight of the liquid composition is 1% by weight to 10% by weight inclusive, wherein a ratio by weight of the tetramethylammonium hydroxide to the weight of the liquid composition is 5% by weight to 25% by weight inclusive.