Patent ID: 7510977
Filing Date: 2009-03-31
Classification: H01L

Abstract:
1. A method for manufacturing a silicon carbide (SiC) semiconductor device comprising: providing a SiC substrate; forming a well layer of a conductivity type different from the SiC substrate on the SiC substrate; forming selectively an emitter region of the same conductivity type as the SiC substrate in a surface layer of the well layer; forming a selective etch mask in a surface of a SiC laminated semiconductor substrate comprising the SiC substrate, the well layer and the emitter region by using a silicon dioxide film (SiO forming a trench for a trench gate structure by dry etching with the use of high-density inductively-coupled plasma (ICP) from a surface of the emitter region that is exposed to the surface of the SiC laminated semiconductor substrate; wherein the dry etching with the use of the high-density ICP comprises a first dry etching and a second dry etching, wherein the etch conditions for the first and second dry etching are different.