Patent ID: 7419581
Filing Date: 2008-09-02
Classification: B81B,B81C,C25F,H01L

Abstract:
1. A method for generating optically transparent regions in a silicon substrate, comprising: etching, in a first etching process, at least one specified region of the silicon substrate to be porous; etching, in a second etching process after the first etching process, the silicon substrate to produce a cavity directly underneath the at least one specified porous region, wherein the second etching process is conducted under conditions in which the silicon substrate is completely etched out in the cavity; and oxidizing the at least one specified porous region of the silicon substrate; wherein in the silicon substrate, the cavity is produced bordered by two porous regions that lie opposite to each other, and wherein, after the generation of the cavity, a third etching process is continued under conditions in which the silicon substrate is etched porous.