Patent ID: 7622351
Filing Date: 2009-11-24
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a first trench region and a second trench region adjacent from each other in a first conductivity type semiconductor base; forming a second conductivity type semiconductor region in said semiconductor base between said first trench region and said second trench region; forming a mask on said second conductivity type semiconductor region, said mask covering a central portion between said first trench region and said second trench region; performing ion implantation of a first conductivity type impurity in said second conductivity type semiconductor region with said mask to form a first conductivity type first region and a first conductivity type second region separated from said first conductivity type first region; and performing heat treatment to diffuse said impurity in said first conductivity type first region and said first conductivity type second region and to form a connection region between said first conductivity type first region and said first conductivity type second region, connection region being shallower than said first conductivity type first region and said first conductivity type second region after said heat treatment.