Patent ID: 6534836
Filing Date: 2003-03-18
Classification: H01L

Abstract:
A semiconductor device comprising: a high impurity concentration first conductivity type semiconductor substrate; a low impurity concentration first conductivity type semiconductor layer formed on a surface of the semiconductor substrate; a trench selectively formed in a surface of the low impurity concentration first conductivity type semiconductor layer; first conductivity type polycrystalline silicon filled inside the trench; a low impurity concentration second conductivity type semiconductor diffusion layer formed on a side wall and a bottom wall of the trench; a relatively shallow low impurity concentration second conductivity type semiconductor diffusion layer partially overlapped with the low impurity concentration second conductivity type semiconductor diffusion layer and selectively formed on the surface of the low impurity concentration first conductivity type semiconductor layer; a high impurity concentration first conductivity type semiconductor diffusion layer selectively formed on the relatively shallow low impurity concentration second conductivity type semiconductor diffusion layer; a gate insulation film formed on the low impurity concentration first conductivity type semiconductor layer and the relatively shallow low impurity concentration second conductivity type semiconductor diffusion layer; and a gate electrode selectively formed on the gate insulation film.