Method of making a vertical FET using epitaxial overgrowth
First Claim
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1. A method for fabrication of a vertical field effect transistor, comprising the steps of:
- (a) providing a substrate of a first semiconductor material and first conductivity type with a first epitaxial layer of a second semiconductor material and said first conductivity type on said substrate, said second semiconductor material being different from said first semiconductor material;
(b) forming a plurality of gate fingers of said second semiconductor material and of a second conductivity type on said first epitaxial layer; and
(c) forming a second epitaxial layer on said gate fingers and said first epitaxial layer, said second epitaxial layer of said second semiconductor material and said first conductivity type and forming channels between adjacent ones of said gate fingers and a planar source over said gate fingers and said channels.
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Abstract
A vertical field effect transistor (1700) and fabrication method with buried gates (1704) having spaced apart gate fingers and connecting structure and overgrown with source and channel epilayer followed by a doping connection of the gate fingers and connecting structure is disclosed. The vertical field effect transistor elements (1702, 1704, 1706, 1708, 1720, 1724) are made of III-V semiconductor compound grown on a germanium substrate (1726).
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Citations
6 Claims
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1. A method for fabrication of a vertical field effect transistor, comprising the steps of:
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(a) providing a substrate of a first semiconductor material and first conductivity type with a first epitaxial layer of a second semiconductor material and said first conductivity type on said substrate, said second semiconductor material being different from said first semiconductor material; (b) forming a plurality of gate fingers of said second semiconductor material and of a second conductivity type on said first epitaxial layer; and (c) forming a second epitaxial layer on said gate fingers and said first epitaxial layer, said second epitaxial layer of said second semiconductor material and said first conductivity type and forming channels between adjacent ones of said gate fingers and a planar source over said gate fingers and said channels. - View Dependent Claims (2, 3, 4, 5, 6)
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