Patent ID: 7518208
Filing Date: 2009-04-14
Classification: H01L

Abstract:
1. A semiconductor device including a MOSFET and a Schottky barrier diode (SBD), comprising: a semiconductor substrate having a first semiconductor layer and a second semiconductor layer on the first semiconductor layer; a first region and a second region on a main surface of the second semiconductor layer; a plurality of first trenches in the first region; a first gate insulating film of the MOSFET formed in each first trench; a first gate electrode of the MOSFET formed in each first trench; a channel forming region of the MOSFET formed between each of adjacent first trenches; a source region of the MOSFET formed on each channel forming region; a plurality of second trenches formed in the second region; a second gate insulating film of the MOSFET formed in each second trench; a second gate electrode of the MOSFET formed in each second trench, all of said first and second gate electrodes being connected to each other; a drain electrode formed over a back surface of the first semiconductor layer; an interlayer insulating film formed over the first and second gate electrodes; and an upper electrode formed over the interlayer insulating film, said upper electrode being electrically connected with each source region, wherein the upper electrode and the second semiconductor layer in the second region between adjacent second gate electrodes form portions of the SBD; and a center-to-center distance between adjacent first gate electrodes is smaller than a center-to-center distance between adjacent second gate electrodes between which the portions of the SBD are formed.