Patent ID: 7161209
Filing Date: 2007-01-09
Classification: H01L

Abstract:
1. A power semiconductor device comprising: a drain layer of a first conductive type; first pillar layers of the first conductive type and second pillar layers of a second conductive type which constitute a super-junction structure on said drain layer of a device section, each of which has a column-shaped sectional structure by stacking and integrated unit first pillar layers of the first conductive type and unit second pillar layers of the second conductive type, respectively, and which are alternately disposed in a horizontal direction; base layers of the second conductive type which are formed on surface portions of said second pillar layers; source layers of the first conductive type formed on a surface portion of said base layers; gate electrodes, each formed through a gate insulating film over a region from one of said source layers formed on the surface portion of one of said base layers to the other of said source layers formed on the surface portion of the other of said base layers adjacent to the one of said base layer via one of said first pillar layers; an outermost pillar layer which has a column-shaped sectional structure by stacking and integrated outermost unit pillar layers formed with a density lower than that of said unit first pillar layers and said unit second pillar layers constituting each of said first pillar layers and said second pillar layers and which is additionally formed at an outermost portion of the super-junction structure of the device section nearest to a device termination section; a high resistance layer of the first conductive type which is formed on said drain layer of the device termination section adjacent to the device section and which has a resistance value higher than that of each of said first pillar layers, said second pillar layers and said base layers; and a source electrode which is formed to be electrically connected with said base layers and said source layers; and a drain electrode which is formed on a back face of said drain layer.