Patent ID: 7858475

Claim:
A method for manufacturing a semiconductor device comprising: preparing a substrate having a first conductive type; forming a plurality of vertical type semiconductor devices having a MOS gate structure in a surface portion of the substrate, wherein the forming the plurality of vertical type semiconductor devices includes forming the MOS gate structure in the surface portion of the substrate; forming a plurality of trenches on a first side of the substrate after the forming the MOS gate structure, wherein each trench is arranged between adjacent two vertical type semiconductor devices; forming a second conductive type semiconductor film in each trench so that the substrate between adjacent two trenches provides a first column, and the second conductive type semiconductor film in each trench provides a second column, wherein the first and second columns are alternately repeated along with a predetermined direction in parallel to the first side of the substrate; and forming an electrode on the first side of the substrate after the forming the second conductive type semiconductor film, wherein each first column provides a drift layer of a corresponding vertical type semiconductor device.