Patent US4142891A successfully refreshed from Google Patents.
US6046093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming capacitors and related integrated circuitry
Assignee: Micron Technology Inc
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Filing: 1997-06-13
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Granted: 2000-04-04
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Expires: 2017-06-13
Abstract
Abstract Capacitor constructions and methods of forming the same are described. In one implementation, a capacitor container is formed over a substrate and includes an internal surface and an external surface. At least some of the external surface is provided to be rougher than at least some of the internal container surface. A capacitor dielectric layer and an outer capacitor plate layer are formed over at least portions of the internal and the external surfaces of the capacitor container. In another implementation, a layer comprising roughened polysilicon is formed over at least some of the external container surface but not over any of the internal container surface. In a preferred aspect, the roughened external surface or roughened polysilicon comprises hemispherical grain polysilicon.
Inventors
- 👤 Scott J. Deboer
- 👤 Klaus F. Schuegraf
- 👤 Randhir P. S. Thakur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:05
CPC Classifications
H; H10; H10D; H10D1/00; H10D1/60; H10D1/68; H10D1/692; H10D1/711; H10D1/712; H10D1/01; H10D1/041; H10D1/042; H10D1/716; H10B; H10B12/00; H10B12/30; H10B12/31; H10B12/312
Claims Analysis
Total Claims: 48
Claim 1
Independent Claim
154 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate by forming an insulative container-defining structure over the substrate prior to forming the capacitor container, the capacitor container having an internal surface and an external surface and comprising a deposited layer of material; after the capacitor container layer has been deposited, forming a masking layer of material over at least all of the internal container surface and to less than completely fill the capacitor container; after forming the masking layer, forming a layer comprising rugged polysilicon over at least some of the external container surface but not over any of the container internal surface; and forming a capacitor dielectric layer and an outer capacitor plate layer over the rugged polysilicon and at least some of the internal container surface, and further comprising prior to forming the capacitor dielectric layer and the outer capacitor plate layer, removing the insulative container-defining structure.
Claim 2
Independent Claim
154 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate by forming an insulative container-defining structure over the substrate prior to forming the capacitor container, the capacitor container having an internal surface and an external surface and comprising a deposited layer of material; after the capacitor container layer has been deposited, forming a masking layer of material over at least all of the internal container surface and to less than completely fill the capacitor container; after forming the masking layer, forming a layer comprising rugged polysilicon over at least some of the external container surface but not over any of the container internal surface; and forming a capacitor dielectric layer and an outer capacitor plate layer over the rugged polysilicon and at least some of the internal container surface, and further comprising prior to forming the capacitor dielectric layer and the outer capacitor plate layer, removing the insulative container-defining structure.
Claim 3
Dependent Claim
85 words
The method of claim 1, wherein the forming of the capacitor container comprises: forming an insulative layer over the substrate comprising material from which the insulative container-defining structure is to be formed; forming an opening in the insulative layer; forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface; forming a masking layer of material over the silicon-containing layer outer surface at least within the opening; and planarizing the silicon-containing layer and the masking layer.
Claim 4
Dependent Claim
46 words
The method of claim 2, wherein the forming of the masking layer of material less than fills the opening and further comprising filling the remaining opening with photoresist before the planarizing of the silicon-containing layer, and planarizing the silicon-containing layer, the masking layer, and the photoresist.
Claim 5
Independent Claim
127 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate, the capacitor container having an internal surface and an external surface, wherein the forming of the capacitor container comprises: forming a capacitor container support layer over the substrate; forming an opening in the capacitor container support layer; and forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface; masking the entire internal surface and leaving at least some of the external surface unmasked; with the masking in place, forming a layer comprising rugged polysilicon over the unmasked external surface; and forming a dielectric layer and a cell plate layer over at least portions of the internal and external surfaces of the capacitor container.
Claim 6
Independent Claim
127 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate, the capacitor container having an internal surface and an external surface, wherein the forming of the capacitor container comprises: forming a capacitor container support layer over the substrate; forming an opening in the capacitor container support layer; and forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface; masking the entire internal surface and leaving at least some of the external surface unmasked; with the masking in place, forming a layer comprising rugged polysilicon over the unmasked external surface; and forming a dielectric layer and a cell plate layer over at least portions of the internal and external surfaces of the capacitor container.
Claim 7
Independent Claim
207 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate, the capacitor container having an internal surface and an external surface, wherein the forming of the capacitor container comprises: forming a capacitor container support layer over the substrate, the capacitor container support layer comprises an outer surface; forming an opening in the capacitor container support layer; and forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface and an inner surface; forming a masking layer of material over at least some of the inner surface of the silicon-containing layer and at least some of the outer surface of the silicon-containing layer; planarizing the silicon-containing layer and the masking layer relative to the capacitor container support layer's outer surface, said planarizing comprising a period which removes silicon-containing layer material and masking layer material at the same time and produces an outer substantially planar surface comprising the silicon-containing layer, the masking layer and the capacitor container support layer; forming a layer comprising rugged polysilicon over the unmasked capacitor container external surface; and forming a dielectric layer and a cell plate layer over at least portions of the internal and external surfaces of the capacitor container.
Claim 8
Independent Claim
207 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate, the capacitor container having an internal surface and an external surface, wherein the forming of the capacitor container comprises: forming a capacitor container support layer over the substrate, the capacitor container support layer comprises an outer surface; forming an opening in the capacitor container support layer; and forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface and an inner surface; forming a masking layer of material over at least some of the inner surface of the silicon-containing layer and at least some of the outer surface of the silicon-containing layer; planarizing the silicon-containing layer and the masking layer relative to the capacitor container support layer's outer surface, said planarizing comprising a period which removes silicon-containing layer material and masking layer material at the same time and produces an outer substantially planar surface comprising the silicon-containing layer, the masking layer and the capacitor container support layer; forming a layer comprising rugged polysilicon over the unmasked capacitor container external surface; and forming a dielectric layer and a cell plate layer over at least portions of the internal and external surfaces of the capacitor container.
Claim 9
Independent Claim
133 words
A method of forming a capacitor comprising: forming a first layer of material over a substrate, the first layer having an outer surface; forming an opening in the first layer material; forming a second layer of material over the substrate to less than fill the opening; forming a third layer of material over the second layer of material, the third layer material being different from the second layer material; forming a layer of photoresist over the substrate and within the opening; planarizing the second, third, and photoresist layers relative to the first layer's outer surface; after the planarizing, removing material of the first layer to outwardly expose material of the second layer; and forming a fourth layer of material comprising rugged polysilicon over exposed second layer material and not over third layer material.
Claim 10
Independent Claim
133 words
A method of forming a capacitor comprising: forming a first layer of material over a substrate, the first layer having an outer surface; forming an opening in the first layer material; forming a second layer of material over the substrate to less than fill the opening; forming a third layer of material over the second layer of material, the third layer material being different from the second layer material; forming a layer of photoresist over the substrate and within the opening; planarizing the second, third, and photoresist layers relative to the first layer's outer surface; after the planarizing, removing material of the first layer to outwardly expose material of the second layer; and forming a fourth layer of material comprising rugged polysilicon over exposed second layer material and not over third layer material.
Claim 11
Independent Claim
120 words
A method of forming a capacitor comprising: forming a first layer of material over a substrate, the first layer having an outer surface; forming an opening in the first layer material; forming a second layer of material over the substrate to less than fill the opening; forming a third layer of material over the second layer of material, the third layer material being different from the second layer material; planarizing the second and third layers relative to the first layer's outer surface; after the planarizing, removing material of the first layer to outwardly expose material of the second layer; and forming a fourth layer of material comprising rugged polysilicon over exposed second layer material and not over third layer material.
Claim 12
Independent Claim
120 words
A method of forming a capacitor comprising: forming a first layer of material over a substrate, the first layer having an outer surface; forming an opening in the first layer material; forming a second layer of material over the substrate to less than fill the opening; forming a third layer of material over the second layer of material, the third layer material being different from the second layer material; planarizing the second and third layers relative to the first layer's outer surface; after the planarizing, removing material of the first layer to outwardly expose material of the second layer; and forming a fourth layer of material comprising rugged polysilicon over exposed second layer material and not over third layer material.
Claim 13
Independent Claim
226 words
A method of forming a capacitor comprising: forming a first layer of material over a substrate node location with which electrical communication is desired, the first layer comprising an insulative material and defining an outer surface; patterning and etching an opening through the outer surface in the first layer material to outwardly expose the node location; forming a second layer of material over the substrate to less than fill the opening, the second layer comprising a conductive material which is in electrical communication with the node location; forming a third layer of material over the second layer of material, the third layer material being different from the second layer material and comprising an insulative material and less than filling remaining volume of the opening; after forming the third layer, filling all of the remaining opening with photoresist; planarizing the second and third layers and the photoresist relative to the first layer's outer surface; removing the photoresist from the opening; removing material of the first layer laterally proximate the second layer to outwardly expose material of the second layer, the exposed material defining a capacitor container outer surface; forming a fourth layer of material comprising rugged polysilicon over exposed second layer material and not over third layer material; and forming a capacitor dielectric layer and a capacitor plate layer over at least the fourth layer of material.
Claim 14
Independent Claim
226 words
A method of forming a capacitor comprising: forming a first layer of material over a substrate node location with which electrical communication is desired, the first layer comprising an insulative material and defining an outer surface; patterning and etching an opening through the outer surface in the first layer material to outwardly expose the node location; forming a second layer of material over the substrate to less than fill the opening, the second layer comprising a conductive material which is in electrical communication with the node location; forming a third layer of material over the second layer of material, the third layer material being different from the second layer material and comprising an insulative material and less than filling remaining volume of the opening; after forming the third layer, filling all of the remaining opening with photoresist; planarizing the second and third layers and the photoresist relative to the first layer's outer surface; removing the photoresist from the opening; removing material of the first layer laterally proximate the second layer to outwardly expose material of the second layer, the exposed material defining a capacitor container outer surface; forming a fourth layer of material comprising rugged polysilicon over exposed second layer material and not over third layer material; and forming a capacitor dielectric layer and a capacitor plate layer over at least the fourth layer of material.
Claim 15
Dependent Claim
27 words
The method of claim 1 comprising leaving at least a portion of the masking layer to comprise a portion of capacitor dielectric material of the finished capacitor.
Claim 16
Dependent Claim
27 words
The method of claim 2 comprising leaving at least a portion of the masking layer to comprise a portion of capacitor dielectric material of the finished capacitor.
Claim 17
Dependent Claim
27 words
The method of claim 3 comprising leaving at least a portion of the masking layer to comprise a portion of capacitor dielectric material of the finished capacitor.
Claim 18
Dependent Claim
28 words
The method of claim 4 comprising leaving at least a portion of the masking in place to comprise a portion of capacitor dielectric material of the finished capacitor.
Claim 19
Independent Claim
191 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate, the capacitor container having an internal surface and an external surface, wherein the forming of the capacitor container comprises: forming a capacitor container support layer over the substrate, the capacitor container support layer comprises an outer surface; forming an opening in the capacitor container support layer; and forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface and an inner surface; forming a masking layer of material over at least some of the inner surface of the silicon-containing layer and at least some of the outer surface of the silicon-containing layer; planarizing the silicon-containing layer and the masking layer relative to the capacitor container support layer's outer surface; forming a layer comprising rugged polysilicon over the unmasked capacitor container external surface; and forming a dielectric layer and a cell plate layer over at least portions of the internal and external surfaces of the capacitor container, and leaving at least a portion of the masking layer to comprise a portion of capacitor dielectric material of the finished capacitor.
Claim 20
Independent Claim
191 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate, the capacitor container having an internal surface and an external surface, wherein the forming of the capacitor container comprises: forming a capacitor container support layer over the substrate, the capacitor container support layer comprises an outer surface; forming an opening in the capacitor container support layer; and forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface and an inner surface; forming a masking layer of material over at least some of the inner surface of the silicon-containing layer and at least some of the outer surface of the silicon-containing layer; planarizing the silicon-containing layer and the masking layer relative to the capacitor container support layer's outer surface; forming a layer comprising rugged polysilicon over the unmasked capacitor container external surface; and forming a dielectric layer and a cell plate layer over at least portions of the internal and external surfaces of the capacitor container, and leaving at least a portion of the masking layer to comprise a portion of capacitor dielectric material of the finished capacitor.
Claim 21
Dependent Claim
27 words
The method of claim 6 comprising leaving at least a portion of the third layer to comprise a portion of capacitor dielectric material of the finished capacitor.
Claim 22
Dependent Claim
27 words
The method of claim 7 comprising leaving at least a portion of the third layer to comprise a portion of capacitor dielectric material of the finished capacitor.
Claim 23
Independent Claim
162 words
A method of forming DRAM circuitry comprising: forming at least two conductive lines over a substrate, the conductive lines defining therebetween a node location with which electrical communication is desired; forming a conductive plug in electrical connection with the node location and extending upwardly therefrom to elevationally higher than conductive material of the two conductive lines; forming a conductive layer over and in electrical connection with the conductive plug; forming a support wall material layer over the conductive layer; etching the support wall material layer to define a pair of laterally outwardly-facing support walls proximate an area in which at least a portion of a capacitor container is to be formed; forming a silicon-containing capacitor container structure over the pair of laterally outwardly-facing support walls in electrical connection with the conductive layer; removing support wall material from laterally inward of the capacitor container structure; and forming a capacitor dielectric layer and an outer capacitor plate layer over the silicon-containing capacitor container structure.
Claim 24
Independent Claim
162 words
A method of forming DRAM circuitry comprising: forming at least two conductive lines over a substrate, the conductive lines defining therebetween a node location with which electrical communication is desired; forming a conductive plug in electrical connection with the node location and extending upwardly therefrom to elevationally higher than conductive material of the two conductive lines; forming a conductive layer over and in electrical connection with the conductive plug; forming a support wall material layer over the conductive layer; etching the support wall material layer to define a pair of laterally outwardly-facing support walls proximate an area in which at least a portion of a capacitor container is to be formed; forming a silicon-containing capacitor container structure over the pair of laterally outwardly-facing support walls in electrical connection with the conductive layer; removing support wall material from laterally inward of the capacitor container structure; and forming a capacitor dielectric layer and an outer capacitor plate layer over the silicon-containing capacitor container structure.
Claim 25
Dependent Claim
20 words
The method of claim 5 comprising forming the masking layer over all of the outer surface of the silicon-containing layer.
Claim 26
Dependent Claim
13 words
The method of claim 5 wherein the planarizing includes a mechanical polishing action.
Claim 27
Dependent Claim
14 words
The method of claim 18 wherein the mechanical polishing action comprises chemical mechanical polishing.
Claim 28
Dependent Claim
12 words
The method of claim 5 wherein the planarizing comprises resist etch back.
Claim 29
Independent Claim
168 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate, the capacitor container having an internal surface and an external surface, wherein the forming of the capacitor container comprises: forming a capacitor container support layer over the substrate, the capacitor container support layer comprises an outer surface; forming an opening in the capacitor container support layer; and forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface and an inner surface; forming a masking layer of material over at least some of the inner surface of the silicon-containing layer and over all of the outer surface of the silicon-containing layer; planarizing the silicon-containing layer and the masking layer relative to the capacitor container support layer's outer surface; forming a layer comprising rugged polysilicon over the unmasked capacitor container external surface; and forming a dielectric layer and a cell plate layer over at least portions of the internal and external surfaces of the capacitor container.
Claim 30
Independent Claim
168 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate, the capacitor container having an internal surface and an external surface, wherein the forming of the capacitor container comprises: forming a capacitor container support layer over the substrate, the capacitor container support layer comprises an outer surface; forming an opening in the capacitor container support layer; and forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface and an inner surface; forming a masking layer of material over at least some of the inner surface of the silicon-containing layer and over all of the outer surface of the silicon-containing layer; planarizing the silicon-containing layer and the masking layer relative to the capacitor container support layer's outer surface; forming a layer comprising rugged polysilicon over the unmasked capacitor container external surface; and forming a dielectric layer and a cell plate layer over at least portions of the internal and external surfaces of the capacitor container.
Claim 31
Independent Claim
179 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate, the capacitor container having an internal surface and an external surface, wherein the forming of the capacitor container comprises: forming a capacitor container support layer over the substrate, the capacitor container support layer comprises an outer surface; forming an opening in the capacitor container support layer; and forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface and an inner surface; forming a masking layer of material over at least some of the inner surface of the silicon-containing layer and at least some of the outer surface of the silicon-containing layer; planarizing the silicon-containing layer and the masking layer to leave a coplanar outer surface of the capacitor container support layer, the silicon-containing layer and the masking layer; forming a layer comprising rugged polysilicon over the unmasked capacitor container external surface; and forming a dielectric layer and a cell plate layer over at least portions of the internal and external surfaces of the capacitor container.
Claim 32
Independent Claim
179 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate, the capacitor container having an internal surface and an external surface, wherein the forming of the capacitor container comprises: forming a capacitor container support layer over the substrate, the capacitor container support layer comprises an outer surface; forming an opening in the capacitor container support layer; and forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface and an inner surface; forming a masking layer of material over at least some of the inner surface of the silicon-containing layer and at least some of the outer surface of the silicon-containing layer; planarizing the silicon-containing layer and the masking layer to leave a coplanar outer surface of the capacitor container support layer, the silicon-containing layer and the masking layer; forming a layer comprising rugged polysilicon over the unmasked capacitor container external surface; and forming a dielectric layer and a cell plate layer over at least portions of the internal and external surfaces of the capacitor container.
Claim 33
Independent Claim
112 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate by forming an insulative container-defining structure over the substrate prior to forming the capacitor container, the capacitor container having an internal surface and an external surface; forming a layer comprising rugged polysilicon over a predominate portion of the external container surface but not over a predominate portion of the internal container surface; and forming a capacitor dielectric layer and an outer capacitor plate layer over the rugged polysilicon and at least some of the internal container surface, and further comprising prior to forming the capacitor dielectric layer and the outer capacitor plate layer, removing the insulative container-defining structure.
Claim 34
Independent Claim
112 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate by forming an insulative container-defining structure over the substrate prior to forming the capacitor container, the capacitor container having an internal surface and an external surface; forming a layer comprising rugged polysilicon over a predominate portion of the external container surface but not over a predominate portion of the internal container surface; and forming a capacitor dielectric layer and an outer capacitor plate layer over the rugged polysilicon and at least some of the internal container surface, and further comprising prior to forming the capacitor dielectric layer and the outer capacitor plate layer, removing the insulative container-defining structure.
Claim 35
Dependent Claim
31 words
The method of claim 23, wherein the forming of the layer comprising rugged polysilicon comprises forming a layer of hemispherical grain polysilicon over the predominate portion of the external container surface.
Claim 36
Dependent Claim
32 words
The method of claim 23 further comprising prior to the forming of the layer comprising rugged polysilicon, forming a masking layer of material over at least some of the internal container surface.
Claim 37
Dependent Claim
80 words
The method of claim 23, wherein the forming of the capacitor container comprises: forming a capacitor container support layer comprising material from which the insulative container-defining structure is to be formed over the substrate; forming an opening in the capacitor container support layer; forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface; and forming a masking layer of material over at least some of the silicon-containing layer outer surface.
Claim 38
Dependent Claim
35 words
The method of claim 26, wherein the capacitor container support layer comprises an outer surface, and further comprising planarizing the silicon-containing layer and the masking layer relative to the capacitor container support layer's outer surface.
Claim 39
Dependent Claim
60 words
The method of claim 27 further comprising: after the planarizing of the layers, removing at least some of the insulative container-defining structure from laterally proximate the silicon-containing layer to outwardly expose at least a portion thereof; and the forming of the layer comprising rugged polysilicon comprises forming a layer of hemispherical grain polysilicon over the outwardly exposed silicon-containing layer portion.
Claim 40
Dependent Claim
58 words
The method of claim 26 further comprising: after the forming of the masking layer, removing at least some of the insulative container-defining structure to outwardly expose at least a portion of the silicon-containing layer; and the forming of the layer comprising rugged polysilicon comprises forming a layer of hemispherical grain polysilicon over the outwardly exposed silicon-containing layer portion.
Claim 41
Independent Claim
89 words
A method of forming a capacitor container comprising: forming a capacitor container by forming an insulative container-defining structure over the substrate prior to forming material of the capacitor container, the capacitor container having an internal container surface and an external container surface; exposing the capacitor container to conditions effective to form a layer of conductive material over at least some of the external surface and not over any of the internal surface; and after forming the capacitor container, removing the insulative container-defining structure to leave behind the capacitor container.
Claim 42
Independent Claim
89 words
A method of forming a capacitor container comprising: forming a capacitor container by forming an insulative container-defining structure over the substrate prior to forming material of the capacitor container, the capacitor container having an internal container surface and an external container surface; exposing the capacitor container to conditions effective to form a layer of conductive material over at least some of the external surface and not over any of the internal surface; and after forming the capacitor container, removing the insulative container-defining structure to leave behind the capacitor container.
Claim 43
Dependent Claim
40 words
The method of claim 30, wherein the internal surface defines an opening and the exposing of the capacitor container comprises forming a masking layer of material within the opening and over the internal surface to less than fill the opening.
Claim 44
Dependent Claim
50 words
The method of claim 31, wherein the masking layer of material comprises a nitride-containing material and further comprising after the exposing of the capacitor container, forming a nitride-containing capacitor dielectric layer over at least some of the external surface, and an outer capacitor plate over the internal and external surfaces.
Claim 45
Dependent Claim
48 words
The method of claim 30, wherein: the masking layer of material comprises an oxide formed through decomposition of tetraethylorthosilicate; and after the exposing of the capacitor container, removing the masking layer and forming a capacitor dielectric layer and an outer capacitor plate over the internal and external surfaces.
Claim 46
Dependent Claim
41 words
The method of claim 30, wherein the layer of conductive material comprises hemispherical grain polysilicon having an average grain size which is larger than would otherwise be possible if the hemispherical grain polysilicon were to be formed over the internal surface.
Claim 47
Independent Claim
125 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate, the capacitor container having an internal surface and an external surface, wherein the forming of the capacitor container comprises: forming a capacitor container support layer over the substrate; forming an opening in the capacitor container support layer; and forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface; masking at least some of the internal surface and leaving at least some of the external surface unmasked; forming a layer comprising rugged polysilicon over the unmasked external surface; and forming a dielectric layer and a cell plate layer over at least portions of the internal and external surfaces of the capacitor container.
Claim 48
Independent Claim
125 words
A method of forming a capacitor comprising: forming a capacitor container over a substrate, the capacitor container having an internal surface and an external surface, wherein the forming of the capacitor container comprises: forming a capacitor container support layer over the substrate; forming an opening in the capacitor container support layer; and forming a silicon-containing layer over the substrate to less than fill the opening, the silicon-containing layer having an outer surface; masking at least some of the internal surface and leaving at least some of the external surface unmasked; forming a layer comprising rugged polysilicon over the unmasked external surface; and forming a dielectric layer and a cell plate layer over at least portions of the internal and external surfaces of the capacitor container.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-04-04 | 2003-10-04 | 2004-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-04 | 2007-10-04 | 2008-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-04-04 | 2011-10-04 | 2012-04-04 | $7700.00 | Window Closed / Lapsed |