Conductivity improvements for III-V semiconductor devices
First Claim
1. A method of forming a transistor, comprising:
- forming a III-V semiconductor stack by epitaxially forming a first III-V layer directly on a III-V channel layer, said III-V channel layer epitaxially formed directly on a III-V buffer layer;
etching said first III-V layer where said transistor'"'"'s gate electrode is to be placed, said etching creating a void within said first III-V layer, said III-V buffer layer not acting as an etch stop for said etch;
epitaxially forming a barrier layer in said void that fills said void;
forming a gate electrode over said barrier layer wherein an end of said gate electrode that is closest to said III-V channel layer extends into said barrier layer; and
,forming source and drain electrodes over said first III-V layer.
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Abstract
Conductivity improvements in III-V semiconductor devices are described. A first improvement includes a barrier layer that is not coextensively planar with a channel layer. A second improvement includes an anneal of a metal/Si, Ge or SiliconGermanium/III-V stack to form a metal-Silicon, metal-Germanium or metal-SiliconGermanium layer over a Si and/or Germanium doped III-V layer. Then, removing the metal layer and forming a source/drain electrode on the metal-Silicon, metal-Germanium or metal-SiliconGermanium layer. A third improvement includes forming a layer of a Group IV and/or Group VI element over a III-V channel layer, and, annealing to dope the III-V channel layer with Group IV and/or Group VI species. A fourth improvement includes a passivation and/or dipole layer formed over an access region of a III-V device.
47 Citations
20 Claims
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1. A method of forming a transistor, comprising:
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forming a III-V semiconductor stack by epitaxially forming a first III-V layer directly on a III-V channel layer, said III-V channel layer epitaxially formed directly on a III-V buffer layer; etching said first III-V layer where said transistor'"'"'s gate electrode is to be placed, said etching creating a void within said first III-V layer, said III-V buffer layer not acting as an etch stop for said etch; epitaxially forming a barrier layer in said void that fills said void; forming a gate electrode over said barrier layer wherein an end of said gate electrode that is closest to said III-V channel layer extends into said barrier layer; and
,forming source and drain electrodes over said first III-V layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, comprising:
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forming a first layer composed of Si and/or Ge on an undoped III-V material; forming a second metal layer on the first layer, said second metal layer composed of any of the following;
Ni, Ti, Al, Hf, Zr and W;annealing said first layer, said second metal layer and said III-V material to; i) provide respective Si and/or Ge dopants into said III-V material; ii) provide metal of said second layer into said first layer; removing said second layer; and
,forming an electrode on said first layer. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of forming a transistor, comprising:
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forming a layer of material composed of a Group IV element and a Group VI element on an exposed undoped region of a channel layer, said channel layer composed of a III-V material; doping said exposed region of said channel layer by driving said Group IV element and said Group VI element into said exposed region of said channel layer with any of the following; spike anneal; flash anneal; laser anneal; and
,forming an electrode over said doped channel layer region. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method of forming a transistor, comprising:
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forming a layer of material composed of a Group IV element on an exposed undoped region of a channel layer, said channel layer composed of a III-V material; doping said exposed region of said channel layer by driving said Group IV element into said exposed region of said channel layer in an environment that promotes said Group IV element'"'"'s occupation of a Group III lattice site of said channel layer and not a Group V lattice site of said channel layer, wherein said environment includes overpressure of a Group V element, said driving accomplished with any of the following; spike anneal; flash anneal; laser anneal; and
,forming an electrode over said doped channel layer region.
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20. A method of forming a transistor, comprising:
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forming a layer of material composed of a Group IV element on an exposed undoped region of a channel layer, said channel layer composed of a III-V material; doping said exposed region of said channel layer by driving said Group IV element into said exposed region of said channel layer in an environment that promotes said Group IV element'"'"'s occupation of a Group III lattice site of said channel layer and not a Group V lattice site of said channel layer, wherein said environment includes overpressure of a Group V element and wherein said Group V element is selected from the group consisting of; As; Sb; said driving accomplished with any of the following; spike anneal; flash anneal; laser anneal; and
,forming an electrode over said doped channel layer region.
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Specification