Patent ID: 6531068
Filing Date: 2003-03-11
Classification: H01L

Abstract:
A method of anisotropic etching of silicon with structures by using a plasma, comprising the steps of:a) applying a polymer, using a polymerization process and an oxygen-free passivation gas, to a lateral border of the structures; b) simultaneously: partially removing the applied polymer using an etching process, the etching process being performed with an etching gas containing sulfur, fluorine, and 3 to 40 vol % oxygen, and redepositing the polymer in deeper portions of a side wall newly formed by the etching process, wherein: a performance of the polymerization process is alternated with a performance of the etching process; and c) oxidizing sulfur atoms in an area of a vacuum pump and in an exhaust gas line, wherein the oxidation of the sulfur atoms prevents an interfering deposition of sulfur in the pump and in the exhaust gas line.