Patent ID: 6507071
Filing Date: 2003-01-14
Classification: H01L

Abstract:
A lateral high-voltage sidewall transistor configuration, comprising:a low-doped semiconductor substrate of a first conductivity type; a low-doped epitaxial layer of a second conductivity type disposed on said semiconductor substrate; first semiconductor layers of the first conductivity type and second semiconductor layers of the second conductivity type, said first and second semiconductor layers being disposed in an alternating configuration in said epitaxial layer; a source region of the second conductivity type extending through said first and second semiconductor layers as far as said semiconductor substrate; a drain region of the second conductivity type extending through said first and second semiconductor layers as far as said semiconductor substrate; said epitaxial layer being formed with a gate trench; a gate electrode including a gate insulating layer lining said gate trench and including a conductive material filling said gate trench, said gate electrode extending through said first and second semiconductor layers as far as said semiconductor substrate and being disposed adjacent to said source region in a direction toward said drain region; said source region and said gate trench each having at least one side; and a semiconductor region of the first conductivity type disposed on said at least one side of said source region and said gate trench, said semiconductor region extending as far as said semiconductor substrate and extending under said source region and extending partially under said gate insulating layer.