U-GATE TRANSISTORS AND METHODS OF FABRICATION
First Claim
1. A method of forming a semiconductor structure, comprising:
- forming a fin of a semiconductor material on a first insulating layer, wherein a mask layer is on a top surface of the fin;
forming a second insulating layer on the fin leaving a top surface of the mask layer exposed, wherein a protection layer is deposited between the fin and the second insulating layer;
removing the mask layer;
forming spacers on the top surface of the fin adjacent to the protection layer; and
forming a recess in the fin, the recess having a bottom and opposing sidewalls.
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Accused Products
Abstract
A process is described for manufacturing of non-planar multi-corner transistor structures. A fin of a semiconductor material having a mask on a top surface of the fin is formed on a first insulating layer. A second insulating layer is formed on the fin exposing a top surface of the mask, wherein a protection layer is deposited between the fin and the second insulating layer. Next, the mask is removed and spacers are formed on the fin adjacent to the protection layer. A recess having a bottom and opposing sidewalls is formed in the fin. A gate dielectric layer and a gate electrode are formed on the top surface, the opposing sidewalls of the fin and on the bottom and on the opposing sidewalls of the recess in the fin. A source region and a drain region are formed in the fin at the opposite sides of the gate electrode.
86 Citations
37 Claims
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1. A method of forming a semiconductor structure, comprising:
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forming a fin of a semiconductor material on a first insulating layer, wherein a mask layer is on a top surface of the fin;
forming a second insulating layer on the fin leaving a top surface of the mask layer exposed, wherein a protection layer is deposited between the fin and the second insulating layer;
removing the mask layer;
forming spacers on the top surface of the fin adjacent to the protection layer; and
forming a recess in the fin, the recess having a bottom and opposing sidewalls. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of forming a semiconductor transistor structure comprising:
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forming a fin of a semiconductor material on a first insulating layer on a substrate, the fin having a top surface, a first sidewall, and a second sidewall;
forming a recess in the fin, the recess having a bottom and sidewalls, wherein each of the sidewalls includes at least one step;
forming a gate dielectric layer on the top surface of the fin, on the first and the second sidewalls of the fin, on the bottom of the recess and on the sidewalls of the recess;
forming a gate electrode on the dielectric layer; and
forming a drain region and a source region at opposite sides of the gate electrode. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of forming a semiconductor structure, comprising:
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forming a fin of a semiconductor material on a first insulating layer, wherein a buffer layer is deposited between a top surface of the fin and a hard mask layer;
forming a second insulating layer on the fin leaving a top surface of the hard mask layer exposed, wherein a top surface of the second insulating layer is substantially planar with the top surface of the hard mask layer;
removing the hard mask layer to expose the buffer layer;
forming spacers on the buffer layer adjacent to the second insulating layer; and
etching the fin from the exposed portion of the top surface down to the first insulating layer to produce two halved fins. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A method comprising:
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forming a fin of a semiconductor material on a first insulating layer;
forming a second insulating layer on the fin leaving a top surface of the hard mask layer exposed, wherein a top surface of the second insulating layer is substantially planar with the top surface of the hard mask layer;
removing the hard mask layer to expose the buffer layer;
forming spacers on the buffer layer adjacent to a protection layer adjacent to the second insulating layer; and
etching the fin from the exposed portion of the top surface down to a predetermined depth;
depositing a passivation layer on the bottom of the recess;
shrinking the spacers in size to expose portions of the top surface of the fin covered by the buffer layer;
etching away the exposed portions of the top surface of the fin covered by the buffer layer to form the step. - View Dependent Claims (31, 32)
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33. A semiconductor structure, comprising:
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a fin of a semiconductor material on an insulating layer, the fin having a top surface, a first sidewall, a second sidewall, and first set of corners;
a recess in the fin, the recess having a bottom, a third sidewall, a forth sidewall, wherein the third sidewall and the forth sidewall are internal sidewalls of the recess, and second set of corners, wherein a number of the second set of corners are larger than the number of the first set of corners. - View Dependent Claims (34, 35, 36, 37)
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Specification