Patent ID: 6451645
Filing Date: 2002-09-17
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device having a power semiconductor element and a diode, comprising:preparing a semiconductor substrate having a semiconductor layer of a first conductivity type; forming an insulation film on the semiconductor layer; disposing first and second electrode materials on the insulation film, the first electrode material being disposed in a first area for forming the power semiconductor element, the second electrode material being disposed in a second area for forming the diode; forming a channel-well region of a second conductivity type in a surface portion of the semiconductor layer in the first area; ion-implanting a first conductivity type impurity into a surface portion of the channel-well region to form a source region of the first conductivity type, into the first electrode material to form a gate electrode in the first area, and into a part of the second electrode material to form a first conductivity type region in the second area; performing a heat treatment to form an oxide film by surface oxidation on the first area having the gate electrode and the source region, and on the second electrode material including the first conductivity type region; and ion-implanting a second conductivity type impurity into the channel-well region to form a contact region in the first area, and into the second electrode material to form a second conductivity type region in the second area, through the oxide film serving as a mask.