| 摘要 |
A lateral power MISFET comprising a semiconductor substrate (40) of a first conductivity type, eg. p-type; a semiconductor layer (50) of said first conductivity type having a higher resistance than that of said semiconductor substrate and provided on a top surface of said semiconductor substrate; an insulated gate electrode (10,60) provided on the top surface of said semiconductor layer; a drain layer (70) of a second conductivity type, eg. n-type, provided in a surface portion of said semiconductor layer on one side of said gate electrode; a drain electrode (20); a source layer (80) of the second conductivity type provided in a further surface portion of said semiconductor layer on another side of said gate electrode; a first connecting portion (100) of the first conductivity type provided in said semiconductor layer adjoining said source layer, which does not reach said semiconductor substrate, and which has lower resistance than that of said semiconductor layer; a second connecting portion (110,112) provided in said semiconductor layer and extending to said semiconductor substrate; a source electrode (30) connecting said first connecting portion and said second connecting portion; and a bottom electrode (31) provided on the bottom surface of said semiconductor substrate. A further lateral power MISFET having a second connecting portion (114) adjoining the drain region (70) and extending to a semiconductor substrate (40) of the second conductivity type having a drain electrode (20) provided on the bottom surface thereof is also disclosed.
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