Patent ID: 6861703
Filing Date: 2005-03-01
Classification: H01L

Abstract:
1. A semiconductor device including a MISFET, comprising: a semiconductor substrate having a first conduction type; a first semiconductor region having the first conduction type, formed in the semiconductor substrate; a second semiconductor region having a second conduction type which is opposite to the first conduction type, formed over the first semiconductor region; a third semiconductor region having the first conduction type, formed over the second semiconductor region; an insulating film formed over the third semiconductor region; a first hole reaching the second semiconductor region, formed in the third semiconductor region; a second hole connected to the first hole, formed in the insulating film; and a conductive film formed in the first and the second holes, wherein the conductive film is electrically connected to the second and the third semiconductor regions, a width of the second hole is larger than a width of the first hole, the semiconductor substrate has a main surface and a back surface, a trench reaching the first semiconductor region is formed in the main surface of the semiconductor substrate, a gate insulating film of the MISFET is formed in the trench, and a gate electrode of the MISFET is formed over the gate insulating film.