Patent ID: 7067870
Filing Date: 2006-06-27
Classification: H01L

Abstract:
1. A semiconductor element comprising: a semiconductor substrate of a first conductivity type having a first major surface and a second major surface opposing the first major surface; a drift layer of the first conductivity type formed on the first major surface of said semiconductor substrate; a well layer of a second conductivity type selectively formed in a surface of said drift layer; a first trench formed to reach at least an inside of said drift layer through said well layer; a buried electrode formed in said first trench through a first insulating film; a source layer of the first conductivity type selectively formed in a surface of said well layer between said first trenches; a second trench formed to reach an inside of said drift layer from a surface of said source layer through said well layer; a control electrode formed in said second trench through a second insulating film; a first main electrode formed on the second major surface of said semiconductor substrate; and a second main electrode connected to said source layer and said well layer.