Patent ID: 7227225

Claim:
A semiconductor device comprising: a first semiconductor region of a first conductivity type; a second semiconductor region of a second conductivity type formed on the first semiconductor region; a third semiconductor region of the first conductivity type formed on a part of the second semiconductor region; a trench formed to range from a surface of the third semiconductor region to the third semiconductor region and the second semiconductor region, the trench penetrating the third semiconductor region, a depth of the trench being shorter than a depth of a deepest bottom portion of the second semiconductor region; a gate insulating film formed on both facing side surfaces of the trench; first and second gate electrodes formed on the gate insulating film and opposed to the facing side surfaces of the trench, the first and second gate electrodes being separated from each other, the separated first and second gate electrodes including, in a cross sectional cut in a depth direction of the trench and including the first and second gate electrodes, at least one portion to which the first and second gate electrodes are not connected; a first conductive material formed between the first and second gate electrodes on the side surfaces of the trench, with an insulating film intervened between the first conductive material and the first and second gate electrodes, wherein a boundary portion between the first semiconductor region and the second semiconductor region and a bottom portion of the trench cross each other; and a fifth semiconductor region of the second conductivity type formed on a part of the second semiconductor region, the fifth semiconductor region having an impurity concentration higher than an impurity concentration of the second semiconductor region; and a source electrode formed on the fifth semiconductor region and the third semiconductor region.