Patent ID: 8399325
Filing Date: 2013-03-19
Classification: H01L

Abstract:
1. A method for producing a semiconductor device with an electrode structure, the method comprising: providing a semiconductor body with a first surface, and with a first sacrificial layer extending in a vertical direction of the semiconductor body from the first surface, the first sacrificial layer including a material different than the semiconductor body that can be removed or etched selectively relative to the semiconductor body; forming a first trench extending from the first surface into the semiconductor body, wherein forming the first trench at least comprises removing the sacrificial layer in a section adjacent to the first surface; forming a second trench by isotropically etching the semiconductor body in the first trench; forming a dielectric layer which covers sidewalls of the second trench; and forming an electrode on the dielectric layer in the second trench, the electrode and the dielectric layer in the second trench forming the electrode structure.