Semiconductor structure having low resistance and method of manufacturing same
First Claim
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1. A semiconductor device comprising:
- a dielectric layer formed on a semiconductor substrate;
a polysilicon layer formed on the dielectric layer;
an interface-reaction preventing layer formed on the polysilicon layer, the interface-reaction preventing layer structured to prevent a reaction between the polysilicon layer and a material layer subsequently formed on the interface-reaction preventing layer;
a barrier layer formed on the interface-reaction preventing layer; and
a metal layer formed on the barrier layer.
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Abstract
Embodiments of the present invention include semiconductor devices that can be made with relatively low resistance, and methods of forming such devices. Between forming a polysilicon layer and a metal layer, an interface reaction preventing layer is created. This reaction preventing layer prevents a buildup of highly resistive materials that would otherwise occur when creating conventional semiconductor devices, as well as having other functions.
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Citations
49 Claims
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1. A semiconductor device comprising:
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a dielectric layer formed on a semiconductor substrate;
a polysilicon layer formed on the dielectric layer;
an interface-reaction preventing layer formed on the polysilicon layer, the interface-reaction preventing layer structured to prevent a reaction between the polysilicon layer and a material layer subsequently formed on the interface-reaction preventing layer;
a barrier layer formed on the interface-reaction preventing layer; and
a metal layer formed on the barrier layer. - View Dependent Claims (2, 3, 4)
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5. A MOS transistor comprising:
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a gate dielectric layer formed on a semiconductor substrate; and
a gate stack formed on the gate dielectric layer, the gate stack having a polysilicon layer disposed on the gate dielectric layer, an interface-reaction preventing layer disposed on the polysilicon layer, a tungsten nitride barrier layer disposed on the interface-reaction preventing layer, and a layer of tungsten disposed on the barrier layer. - View Dependent Claims (6, 7)
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8. A method of manufacturing a semiconductor device, comprising:
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forming a dielectric layer on a semiconductor substrate;
forming a polysilicon layer on the dielectric layer;
forming an interface-reaction preventing layer on the polysilicon layer;
forming a metal-nitride barrier layer on the interface-reaction preventing layer; and
forming a metal layer on the metal-nitride barrier layer, wherein forming the metal-nitride barrier layer does not comprise forming a titanium nitride layer. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 29, 30, 31)
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22. A method of manufacturing a MOS transistor, comprising:
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forming a gate dielectric layer on a semiconductor substrate;
forming a polysilicon layer on the dielectric layer;
forming an interface-reaction preventing layer on the polysilicon layer;
forming a tungsten-nitride barrier layer on the interface-reaction preventing layer; and
forming a tungsten layer on the barrier layer. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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32. A semiconductor device, comprising:
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a substrate having a dielectric layer formed thereon;
a polysilicon layer disposed on the dielectric layer;
a metal layer formed over the polysilicon layer;
a barrier layer formed between the polysilicon layer and the metal layer; and
an additional layer formed between the polysilicon layer and the metal layer, the additional layer distinct from the barrier layer and structured to prevent chemical reactions when the barrier layer is formed. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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39. A method for forming a semiconductor device, comprising:
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forming a dielectric layer on a semiconductor substrate;
forming a polysilicon layer disposed on the dielectric layer;
forming a tungsten silicide layer on the polysilicon layer;
depositing a tungsten nitride layer on the tungsten silicide layer; and
depositing a tungsten layer on the tungsten nitride layer;
- View Dependent Claims (40, 41, 42, 43, 44)
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45. A semiconductor contact structure, comprising:
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a polysilicon layer;
a dielectric layer disposed on the polysilicon layer;
a contact hole formed within the dielectric layer;
an interface reaction barrier disposed over the dielectric layer and in the contact hole, the interface reaction barrier adjacent the polysilicon layer within the contact hole;
a second barrier layer disposed on the interface reaction barrier; and
a second metal interconnection layer formed over the second barrier layer. - View Dependent Claims (46)
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47. A method of forming a contact structure on a semiconductor substrate, comprising;
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forming an interlayer dielectric layer having a contact hole therein, the contact hole open to a polysilicon layer formed on the substrate;
forming a interface-reaction preventing layer on the interlayer dielectric layer and within the contact hole, the interface-reaction preventing layer adjacent the polysilicon layer in the contact hole;
forming a barrier layer on the interface-reaction preventing barrier layer; and
forming an interconnection layer adjacent and on the barrier layer. - View Dependent Claims (48, 49)
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Specification