Patent ID: 6362079
Filing Date: 2002-03-26
Classification: G01P,H01L,Y10S

Abstract:
A process for anodizing a semiconductor device containing a p-type single crystal silicon substrate, the semiconductor device comprising:a first p-type silicon layer formed on a first side of the substrate over a predetermined area; an n-type silicon layer formed on the first side of the substrate, the first p-type silicon layer being buried under the n-type silicon layer; a second p-type silicon layer for forming an opening defined in the n-type silicon layer; a protecting film formed on the n-type silicon layer with the surface of the second p-type silicon layer being exposed; a silicide formed between the protecting film and the n-type silicon layer, wherein the protecting film and the silicide are formed of metals having a high HF resistance; an insulating film formed on a second side opposing the first side of the substrate; and an electrode layer formed on the insulating film, which has a connecting section formed at a portion aligned with the first p-type silicon layer, and connected electrically via the connecting section to the substrate; the process comprising the steps of: connecting respectively a positive terminal and a negative terminal of a DC power source to the electrode layer and to a counter electrode disposed to oppose the substrate; and applying a voltage between the electrode layer and the counter electrode in an HF solution so as to impart porosity to the first and second p-type silicon layers.