Method of forming a dual-sided capacitor
First Claim
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1. A method of forming a capacitor comprising:
- forming a doped polycrystalline layer over a substrate;
forming a native oxide layer over said doped polycrystalline layer;
forming a layer of hemispherical grained polysilicon over said native oxide layer;
forming a dielectric layer over at least a portion of an outer side of said doped polycrystalline layer and said layer of hemispherical grained polysilicon; and
forming a conductive layer over said dielectric layer.
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Abstract
A dual-sided HSG capacitor and a method of fabrication are disclosed. A thin native oxide layer is formed between a doped polycrystalline layer and a layer of hemispherical grained polysilicon (HSG) as part of a dual-sided lower capacitor electrode. Prior to the dielectric formation, the lower capacitor electrode may be optionally annealed to improve capacitance.
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Citations
23 Claims
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1. A method of forming a capacitor comprising:
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forming a doped polycrystalline layer over a substrate;
forming a native oxide layer over said doped polycrystalline layer;
forming a layer of hemispherical grained polysilicon over said native oxide layer;
forming a dielectric layer over at least a portion of an outer side of said doped polycrystalline layer and said layer of hemispherical grained polysilicon; and
forming a conductive layer over said dielectric layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of forming a dual-sided capacitor comprising:
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forming an opening in an insulating layer;
forming a doped polysilicon layer within said opening;
forming a native oxide layer over said doped polysilicon layer;
forming a layer of hemispherical grained polysilicon over said native oxide layer;
removing at least a portion of said insulating layer to expose at least a portion of an outer side of said doped polysilicon layer;
forming a layer comprising a high-dielectric constant material over said exposed portion of said doped polysilicon layer and over said layer of hemispherical grained polysilicon; and
forming a conductive layer over said layer comprising a high-dielectric constant material. - View Dependent Claims (15, 16, 17, 18, 19, 21, 22, 23)
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20. The method of claim wherein said native oxide layer is formed by atomic layer deposition.
Specification