Two-way Halo Implant
First Claim
Patent Images
1. A semiconductor device comprising:
- a silicon layer; and
a first field-effect transistor, including;
a transistor gate disposed on the silicon layer,a pair of source/drain regions, anda channel region in the silicon layer,wherein the silicon layer is doped with ions, such that a portion of the channel region is implanted with a same non-zero concentration of a particular type of ion as a portion of the silicon layer adjacent to the channel region.
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Abstract
A system and method for ion implantation during semiconductor fabrication. An integrated circuit may be designed with proximately located one-directional transistor gates. A two-way halo ion implantation is performed perpendicularly to the transistor gates in order to embed the dopant into the silicon body on the surface of the semiconductor wafer. The two-way halo both reduces the channeling effect by allowing ion implantation beneath the transistor gate, and reduces the halo shadowing effect resulting from halo implanting which is done parallel to the transistor gates.
11 Citations
16 Claims
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1. A semiconductor device comprising:
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a silicon layer; and a first field-effect transistor, including; a transistor gate disposed on the silicon layer, a pair of source/drain regions, and a channel region in the silicon layer, wherein the silicon layer is doped with ions, such that a portion of the channel region is implanted with a same non-zero concentration of a particular type of ion as a portion of the silicon layer adjacent to the channel region. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for manufacturing a semiconductor device, comprising:
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forming a conductive layer on a top surface of a silicon layer, the conductive layer having a width and a length, wherein the length of the conductive layer extends along an axis and is longer than the respective width; forming a layer of resist on said conductive layer; directing a first ion stream toward the silicon layer at a first angle not normal to the top surface of the silicon layer, said first angle being perpendicular to the axis; directing a second ion stream toward the silicon layer at a second angle not normal to the top surface of the silicon layer, said second angle being perpendicular to the axis, wherein said second ion stream originates from an opposite side of the axis from which the first ion stream originates; and removing at least some of said layer of resist from said conductive layer, wherein only two ion streams are directed toward the silicon layer between steps of forming said layer of resist and removing at least of the said layer of resist. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A semiconductor device comprising:
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a silicon layer; and a polysilicon layer disposed on the silicon layer, the polysilicon layer being divided into a plurality of distinct polysilicon regions, wherein, for each polysilicon region, a first region of the silicon layer underlying the polysilicon region has a same non-zero concentration of a particular type of ion as a second region of the silicon layer not underlying the polysilicon region and immediately adjacent the first region. - View Dependent Claims (14, 15, 16)
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Specification