SEMICONDUCTOR DEVICE WITH TUNABLE WORK FUNCTION
First Claim
1. A metal-oxide semiconductor structure, comprising:
- a substrate with a trench;
a gate dielectric multi-layer overlying the trench, wherein the gate dielectric multi-layer includes a high-k capping layer with a fluorine concentration substantially in a range from 1 at % to 10 at %;
an etch stop layer disposed on the gate dielectric multi-layer;
a work function metallic layer disposed on the etch stop layer;
a barrier layer disposed on the work function metallic layer; and
a silicide layer disposed on the barrier layer.
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Accused Products
Abstract
The metal-oxide semiconductor structure includes a substrate, a gate dielectric multi-layer, an etch stop layer, a work function metallic layer, a barrier layer and a silicide layer. The substrate has a trench. The gate dielectric multi-layer overlies the trench, in which the gate dielectric multi-layer includes a high-k capping layer with a fluorine concentration substantially in a range from 1 at % to 10 at %. The etch stop layer is disposed on the gate dielectric multi-layer. The work function metallic layer is disposed on the etch stop layer. The barrier layer is disposed on the work function metallic layer. The silicide layer is disposed on the barrier layer.
41 Citations
20 Claims
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1. A metal-oxide semiconductor structure, comprising:
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a substrate with a trench; a gate dielectric multi-layer overlying the trench, wherein the gate dielectric multi-layer includes a high-k capping layer with a fluorine concentration substantially in a range from 1 at % to 10 at %; an etch stop layer disposed on the gate dielectric multi-layer; a work function metallic layer disposed on the etch stop layer; a barrier layer disposed on the work function metallic layer; and a silicide layer disposed on the barrier layer. - View Dependent Claims (2, 3, 4)
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5. A semiconductor device, comprising:
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a substrate with a first trench and a second trench; a first metal-oxide semiconductor structure on the substrate, comprising; a first gate dielectric multi-layer overlying the first trench, wherein the first gate dielectric multi-layer includes a first high-k capping layer with a first fluorine concentration substantially in a range from 1 at % to 10 at %; a first etch stop layer disposed on the first gate dielectric multi-layer; a first work function metallic layer disposed on the first etch stop layer; a first barrier layer disposed on the first work function metallic layer; and a first silicide layer disposed on the first barrier layer; and a second metal-oxide semiconductor structure on the substrate, the second metal-oxide semiconductor structure is adjacent to the first metal-oxide semiconductor structure, wherein the second metal-oxide semiconductor structure comprises; a second gate dielectric multi-layer overlying the second trench; a second etch stop layer disposed on the second gate dielectric multi-layer; a second work function metallic layer disposed on the second etch stop layer; a second barrier layer disposed on the second work function metallic layer; and a second silicide layer disposed on the second barrier layer. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method for fabricating a semiconductor device, comprising:
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providing a substrate with a first region and a second region, wherein a first dummy poly gate and a second dummy poly gate are formed in the first region and the second region respectively; removing the first dummy poly gate and the second dummy poly gate to form a first trench and a second trench; forming a gate dielectric multi-layer on the first region and the second region, wherein the gate dielectric multi-layer includes a high-k capping layer; forming an etch stop layer on the gate dielectric multi-layer; forming a sacrificial layer on the etch stop layer, wherein the sacrificial layer is formed from titanium nitride and has a predetermined crystalline orientation ratio of [200] to [111]; performing a thermal treatment using tungsten hexafluoride on the sacrificial layer on the first region, thereby enabling the high-k capping layer on the first region to have a fluorine concentration substantially in a range from 1 at % to 10 at %; removing the sacrificial layer to expose the etch stop layer; forming a first-type work function metallic layer on the etch stop layer on the first region; forming a second-type work function metallic layer on the etch stop layer on the second region and on the first-type work function metallic layer; forming a barrier layer on the second-type work function metallic layer; and forming a silicide layer on the barrier layer. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification