Method of fabricating field effect transistor having polycrystalline silicon gate junction
First Claim
1. A method of forming a field effect transistor comprising the steps of:
- providing a semiconductor substrate having an insulating layer on a face thereof;
forming a single polycrystalline silicon layer of first conductivity type on said insulating layer, said single polycrystalline silicon layer including a pair of opposing ends;
simultaneously doping a portion of said single polycrystalline silicon layer, and portions of said semiconductor substrate adjacent said pair of opposing ends, with dopant ions of a second conductivity type, to simultaneously form a semiconductor junction in said single polycrystalline silicon layer extending parallel to said substrate face, and spaced apart source and drain regions in said substrate at said opposing ends of said single polycrystalline silicon layer.
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Accused Products
Abstract
A field effect transistor includes a polycrystalline silicon gate having a semiconductor junction therein. The semiconductor junction is formed of first and second oppositely doped polycrystalline silicon layers, and extends parallel to the substrate face. The polycrystalline silicon gate including the semiconductor junction therein is perfectly formed by implanting ions into the top of the polycrystalline silicon gate simultaneous with implantation of the source and drain regions. The semiconductor junction thus formed does not adversely impact the performance of the field effect transistor, and provides a low resistance ohmic gate contact. The gate need not be masked during source and drain implant, resulting in simplified fabrication.
97 Citations
7 Claims
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1. A method of forming a field effect transistor comprising the steps of:
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providing a semiconductor substrate having an insulating layer on a face thereof; forming a single polycrystalline silicon layer of first conductivity type on said insulating layer, said single polycrystalline silicon layer including a pair of opposing ends; simultaneously doping a portion of said single polycrystalline silicon layer, and portions of said semiconductor substrate adjacent said pair of opposing ends, with dopant ions of a second conductivity type, to simultaneously form a semiconductor junction in said single polycrystalline silicon layer extending parallel to said substrate face, and spaced apart source and drain regions in said substrate at said opposing ends of said single polycrystalline silicon layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification