Structure and fabricating method of stacked capacitor
First Claim
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1. A method of fabricating a stacked capacitor, comprising steps of:
- providing a substrate;
forming a first dielectric layer on the substrate;
forming a contact in the first dielectric layer;
forming a doped polysilicon layer to fill the contact;
forming an insulating layer to cover the first dielectric layer;
forming an opening in the insulating layer to expose the contact;
forming a crown shaped amorphous silicon layer to cover the opening;
forming a plurality of hemispherical grains (HSG) polysilicon on an exposed surface of the crown shaped amorphous silicon layer;
forming a first metal layer as a lower electrode of the capacitor, the first metal layer is formed from the HSG polysilicon and the crown shaped amorphous silicon layer by a selective metal deposition;
forming a second dielectric layer to cover the first metal layer; and
forming a second metal layer to cover the second dielectric layer, wherein the second metal layer as an upper electrode of the capacitor.
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Abstract
A structure and method of fabricating a stacked capacitor which forms a hemispherical grain (HSG) polysilicon on the surface of a crown shaped amorphous silicon layer. By selective tungsten deposition, the HSG polysilicon and the amorphous silicon layer are displaced with a rough tungsten layer. A material with a high dielectric constant and a metal layer are formed in sequence as a dielectric layer and an upper electrode of the capacitor, so as to form a crown metal-insulator-metal (MIM) capacitor.
46 Citations
16 Claims
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1. A method of fabricating a stacked capacitor, comprising steps of:
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providing a substrate; forming a first dielectric layer on the substrate; forming a contact in the first dielectric layer; forming a doped polysilicon layer to fill the contact; forming an insulating layer to cover the first dielectric layer; forming an opening in the insulating layer to expose the contact; forming a crown shaped amorphous silicon layer to cover the opening; forming a plurality of hemispherical grains (HSG) polysilicon on an exposed surface of the crown shaped amorphous silicon layer; forming a first metal layer as a lower electrode of the capacitor, the first metal layer is formed from the HSG polysilicon and the crown shaped amorphous silicon layer by a selective metal deposition; forming a second dielectric layer to cover the first metal layer; and forming a second metal layer to cover the second dielectric layer, wherein the second metal layer as an upper electrode of the capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of fabricating a stacked capacitor, comprising steps of:
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providing a substrate; forming a dielectric layer to cover the substrate; forming a contact in the dielectric layer; forming a doped polysilicon layer to fill the contact; forming an insulating layer to cover the dielectric layer; forming an opening in the insulating layer to expose the contact; forming a crown shaped amorphous silicon layer to cover the opening; forming a plurality of the HSG polysilicon on an exposed surface of the crown shaped amorphous silicon layer; forming a tungsten layer as the lower electrode of the stacked capacitor, the tungsten layer is formed from the HSG polysilicon and the crown shaped amorphous silicon layer by a selective tungsten deposition; forming a Ta2 O5 layer to cover the tungsten layer; and forming a TiNx layer as the upper electrode of the stacked capacitor to cover the Ta2 O5 layer. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification