Insulated gate field effect transistor having LDD structure and method of making the same including a channel stop having a peak impurity concentration, the channel stop provided below a channel region
First Claim
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1. A semiconductor device having an Lightly Doped Drain structure comprising:
- a semiconductor substrate of a first conductivity type having a surface;
source and drain regions of a second conductivity type provided in said semiconductor substrate to define a channel region therebetween, one of said source and drain regions having a lightly doped region;
a gate insulating film provided over said channel region;
a gate electrode provided over said gate insulating film; and
a channel stop of said first conductivity type, formed below said channel region, having a peak impurity concentration,a depth of said peak impurity concentration from said surface of said semiconductor substrate being deeper than a bottom surface of one of said source and drain regions, andsaid peak impurity concentration being increased as an effective channel length of said channel region is reduced.
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Abstract
Insulated Gate Field Effect Transitor (IGFET) having a reduced channel length without deteriorating an electric field relief effect includes a channel stop, located below a channel region, having a peak impurity concentration. A depth of the peak impurity concentration from the substrate surface is deeper than a bottom surface of source and drain regions that provides an Lightly Doped Drain structure.
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Citations
3 Claims
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1. A semiconductor device having an Lightly Doped Drain structure comprising:
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a semiconductor substrate of a first conductivity type having a surface; source and drain regions of a second conductivity type provided in said semiconductor substrate to define a channel region therebetween, one of said source and drain regions having a lightly doped region; a gate insulating film provided over said channel region; a gate electrode provided over said gate insulating film; and a channel stop of said first conductivity type, formed below said channel region, having a peak impurity concentration, a depth of said peak impurity concentration from said surface of said semiconductor substrate being deeper than a bottom surface of one of said source and drain regions, and said peak impurity concentration being increased as an effective channel length of said channel region is reduced. - View Dependent Claims (2, 3)
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Specification