US20090275185A1 - Methods of forming capacitors - Google Patents

Abstract

A method of forming a capacitor includes providing material having an opening therein over a node location on a substrate. A shield is provided within and across the opening, with a void being received within the opening above the shield and a void being received within the opening below the shield. The shield comprises a nitride. Etching is conducted within the opening through the nitride-comprising shield. After the etching, a first capacitor electrode is formed within the opening in electrical connection with the node location. A capacitor dielectric and a second capacitor electrode are formed operatively adjacent the first capacitor electrode. Other aspects and implementations are contemplated.

Description

TECHNICAL FIELD
• Embodiments disclosed herein pertain to methods of forming capacitors.
BACKGROUND
• Capacitors are one type of component commonly used in the fabrication of integrated circuits, for example in DRAM circuitry. A capacitor is comprised of two conductive electrodes separated by a non-conducting dielectric region. As integrated circuitry density has increased, there is a continuing challenge to maintain sufficiently high storage capacitance despite typical decreasing capacitor area. The increase in density of integrated circuitry has typically resulted in greater reduction in the horizontal dimension of capacitors as compared to the vertical dimension. In many instances, the vertical dimension of capacitors has increased.
• One manner of fabricating capacitors is to initially form an insulative material within which a capacitor storage node electrode is formed. For example, an array of capacitor electrode openings for individual capacitors may be fabricated in such insulative capacitor electrode-forming material, with an example insulative electrode-forming material being silicon dioxide doped with one or both of phosphorus and boron. The capacitor electrode openings may be formed by etching. It can be difficult to etch the capacitor electrode openings within the insulative material, particularly where the openings have high aspect ratio.
• One manner of reducing such difficulty is to split the deposition and etch of such openings into two or more combinations of deposition and etch steps. For example, the material within which the capacitor electrode openings are to be formed can be deposited to an initial deposition thickness which is one half or less of the desired ultimate deposition thickness. Shallower capacitor electrode openings can then be etched to the underlying node location. Such openings are subsequently completely filled/plugged, and another material within which capacitor electrode openings will be formed is deposited over the material in which the first openings were formed and filled. Individual capacitor electrode openings are then formed through the overlying layer to the plugging material. Such can be repeated if desired. Regardless, the plugging material is at some point etched from the capacitor electrode openings to enable contact to be made to a node location on the substrate.
• One common plugging material used in such instances is polysilicon. A native oxide can form on the outermost surfaces thereof that can be difficult to remove. Such oxide can be removed by etching prior to etching the polysilicon within the openings from the substrate. The native oxide etch is usually conducted using an HF wet etching solution. However, the material within which the capacitor electrode openings are usually formed is a doped silicon dioxide, such as borophosphosilicate glass or phosphosilicate glass. The HF will etch such material, thereby undesirably widening the capacitor electrode openings above the plugging material while removing the native oxide received thereover. Further and regardless, it can be difficult to remove the polysilicon plugging material from the openings. Example techniques in accordance with the above are described in U.S. Pat. No. 6,365,453 and 6,204,143.
• Further and regardless, it is often desirable to etch away most if not all of the capacitor electrode-forming material after individual capacitor electrodes have been formed within the openings. Such enables outer sidewall surfaces of the electrodes to provide increased area and thereby increased capacitance for the capacitors being formed. However, the capacitor electrodes formed in deep openings are often correspondingly much taller than they are wide. This can lead to toppling of the capacitor electrodes, either during the etching to expose the outer sidewalls surfaces, during transport of the substrate, and/or during deposition of the capacitor dielectric layer or outer capacitor electrode layer. U.S. Pat. No. 6,667,502 teaches the provision of a brace or retaining structure intended to alleviate such toppling. Other aspects associated in the formation of a plurality of capacitors, some of which include bracing structures, are also disclosed and are:
• • U.S. Published Application No. 2005/0051822;
  • U.S. Published Application No. 2005/0054159;
  • U.S. Published Application No. 2005/0158949;
  • U.S. Published Application No. 2005/0287780;
  • U.S. Published Application No. 2006/0014344;
  • U.S. Published Application No. 2006/0051918;
  • U.S. Published Application No. 2006/0046420;
  • U.S. Published Application No. 2006/0121672;
  • U.S. Published Application No. 2006/0211211;
  • U.S. Published Application No. 2006/0263968;
  • U.S. Published Application No. 2006/0261440;
  • U.S. Published Application No. 2007/0032014;
  • U.S. Published Application No. 2006/0063344;
  • U.S. Published Application No. 2006/0063345.
• Fabrication of capacitors in integrated circuitry such as memory circuitry may form an array of capacitors within a capacitor array area. Control or other circuitry area is often displaced from the capacitor array area, with the substrate including an intervening area between the capacitor array area and the control or other circuitry area. In some instances, a trench is formed in the intervening area between the capacitor array area and the other circuitry area. Such trench can be formed commensurate with the fabrication of the openings within the capacitor array area within which the isolated capacitor electrodes will be received.
• While the invention was motivated in addressing the above-identified issues, it is no way so limited. The invention is only limited by the accompanying claims as literally worded, and in accordance with the doctrine of equivalence.
BRIEF DESCRIPTION OF THE DRAWINGS
• FIG. 1 is a diagrammatic cross section of a substrate fragment in process in accordance with an aspect of the invention.
• FIG. 2 is a diagrammatic top plan view of a larger scale portion of theFIG. 1 substrate.
• FIG. 3 is a view of theFIG. 1 substrate at a processing step subsequent to that shown byFIG. 1, and taken through line3-3 inFIG. 4.
• FIG. 4 is a diagrammatic top plan view of theFIG. 3 substrate fragment.
• FIG. 5 is a view of theFIG. 3 substrate at a processing step subsequent to that shown byFIG. 3.
• FIG. 6 is a view of an alternate embodiment substrate to that shown byFIG. 5.
• FIG. 7 is a view of theFIG. 5 substrate at a processing step subsequent to that shown byFIG. 5.
• FIG. 8 is a view of theFIG. 7 substrate at a processing step subsequent to that shown byFIG. 7.
• FIG. 9 is a view of theFIG. 8 substrate at a processing step subsequent to that shown byFIG. 8.
• FIG. 10 is a view of theFIG. 9 substrate at a processing step subsequent to that shown byFIG. 9.
• FIG. 11 is a view of theFIG. 10 substrate at a processing step subsequent to that shown byFIG. 10.
• FIG. 12 is a view of theFIG. 11 substrate at a processing step subsequent to that shown byFIG. 11, and taken through line12-12 inFIG. 13.
• FIG. 13 is a diagrammatic top plan view of theFIG. 12 substrate fragment.
• FIG. 14 is a view of theFIG. 12 substrate at a processing step subsequent to that shown byFIG. 12.
• FIG. 15 is a view of an alternate embodiment substrate to that shown byFIG. 14.
• FIG. 16 is a view of theFIG. 15 substrate at a processing step subsequent to that shown byFIG. 15.
• FIG. 17 is a diagrammatic representation of DRAM circuitry.
DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS
• Example methods of forming capacitors, including pluralities of capacitors, are described with reference toFIGS. 1-17. Referring initially toFIGS. 1 and 2, a substrate, for example a semiconductor substrate, is indicated generally withreference numeral10. In the context of this document, the term “semiconductor substrate” or “semiconductive substrate” is defined to mean any construction comprising semiconductive material, including, but not limited to, bulk semiconductive materials such as a semiconductive wafer (either alone or in assemblies comprising other materials thereon), and semiconductive material layers (either alone or in assemblies comprising other materials). The term “substrate” refers to any supporting structure, including, but not limited to, the semiconductive substrates described above. Accordingly, and by way of example only,FIG. 1 might comprise a bulk semiconductor material (not shown), for example bulk monocrystalline, and/or comprise semiconductor-on-insulator layers.
• Substrate10 can be considered as comprising acapacitor array area25, acircuitry area75 other thancapacitor array area25, and an interveningarea50 betweencapacitor array area25 andcircuitry area75. In the depicted example embodiment, interveningarea50 completely surrounds and encircles capacitor array area25 (FIG. 2), andcircuitry area75 comprises a peripheral circuitry area to that ofcapacitor array area25. Alternate constructions are contemplated, of course, for example whereby neither interveningarea50 norcircuitry area75 completely or partially encircles acapacitor array area25.
• FIG. 1 depicts aninsulative material12 having electrically conductivestorage node pillars14 formed therethrough.Materials12 and14 may be fabricated over some suitable underlying material, for example bulk monocrystalline and/or underlying circuitry.Example insulative materials12 include doped and undoped silicon dioxides, for example silicon dioxide deposited by the decomposition of tetraethylorthosilicate (TEOS) and/or borophosphosilicate glass (BPSG) and/or silicon nitride. In the context of this document, “doped silicon dioxide” or “silicon dioxide doped” requires at least 0.5 atomic percent concentration of one or a combination of boron or phosphorus in silicon dioxide. Further, an undoped silicon dioxide requires less than 0.5 atomic percent of any of boron and phosphorous. Alternately by way of example only,material12 might comprise anisotropically etched insulative sidewall spacers, for example formed about transistor gate lines (not shown). Anexample material14 is conductively doped polysilicon.Conductive material14 can be considered as comprising or defining a plurality of capacitorstorage node locations15,16,17 and18 onsubstrate10.Storage node locations15,16,17 and18 are examples only, and regardless, may be conductive at this point in the process, or made conductive subsequently.
• Amaterial22 has been formed overmaterial12 and capacitorstorage node locations15,16,17 and18. Examples formaterial22 comprise silicon nitride and/or undoped silicon dioxide deposited to an example thickness range of from about 100 Angstroms to about 2,000 Angstroms.Material22 might be included to provide an etch stop, or other function.
• Some material24 is received overcapacitor array area25 andcircuitry area75, and also in the depicted embodiment over interveningarea50. Such might be homogeneous or comprise multiple different compositions and/or layers. An example material is doped silicon dioxide, for example comprising at least one of phosphorus and boron, such as BPSG, borosilicate glass (BSG), and/or phosphosilicate glass (PSG). An example thickness range formaterial24 is from 5,000 Angstroms to 10 microns, with 2 microns being a specific example. Thinner and greater thicknesses are, of course, contemplated. Regardless and in one embodiment, layers22 and24 compriseexample base material27 received overnode locations15,16,17 and18.
• Referring toFIGS. 3 and 4, a plurality ofopenings28 has been etched intobase material27 overindividual node locations15,16,17 and18. Further, atrench30 has been formed in interveningarea50 withinbase material27. In one embodiment,trench30 completely surroundscapacitor area25, an example technique for formingcapacitor electrode openings28 andtrench30 comprises photolithographic patterning and selective anisotropic dry etch to produce the exampleFIGS. 3 and 4 constructions. An example minimum width oftrench opening30 is from about 200 Angstroms to about 5,000 Angstroms, while an example minimum width forcapacitor electrode openings28 is also from about 200 Angstroms to about 5,000 Angstroms.Trench30 may or may not be formed at this point in the process, or at all. Regardless, the processing depicted byFIGS. 1-4 depicts but one example method of providing a material (i.e. material27) having an opening therein (i.e. any of openings28) over a node location (i.e. any oflocations15,16,17 and18) on a substrate. The opening(s) may or may not extend completely to the node locations at this point in the process. Regardless in one embodiment, the processing depicted byFIGS. 3 and 4 can occur in a suitable processing tool which for convenience in description can be considered as a “first processing tool”. In one embodiment the first processing tool may be a plasma etcher. By way of example only, a LAM™ Exelan™ oxide etch tool is an example such tool.
• Referring toFIG. 5, bridgingmaterial32 has been formed acrossbase material openings28, withsuch openings28 comprisingvoids33 therebeneath. In one embodiment, such occurs by depositing bridgingmaterial32 overbase material27 and acrossbase material openings28, and in one embodiment to partially withinbase material openings28 as shown. In one embodiment, such occurs in the very same first processing tool within which the etching to produceopenings28 inFIGS. 3 and 4 occurred, and in one embodiment before removingsubstrate10 from such processing tool after such etching to produceopenings28. By way of examples only, example bridging materials include nitride-comprising material, for example one or more of silicon nitride, boron nitride, silicon oxynitride, silicon boron nitride, and silicon carbon nitride. Further additionally or alternately and by way of examples only, the bridging material might comprise silicon dioxide, including doped and undoped silicon dioxide. In one embodiment, the base material comprises doped silicon dioxide with a nitride received thereover, and silicon dioxide-comprising bridging material received over the nitride of the base material. Such is shown by way of example only with respect to a substrate fragment10ainFIG. 6. Like numerals form the first described embodiment are utilized where appropriate, with differences being indicated with different numerals or the suffix “a”. InFIG. 6, substrate10acomprises a nitride layer19 (for example any of the above stated nitrides) received overlayer24 as constituting part of base material27a. In the depicted embodiment, nitride layer19 is received “on” (with “on” meaning herein in at least some direct physical touching contact with)layer24. In one embodiment, such as shown inFIG. 5 and where an outermost portion ofmaterial24 comprises doped silicon dioxide and an innermost portion of bridgingmaterial32 comprises undoped silicon dioxide, undoped silicon dioxide of bridgingmaterial32 is formed on doped silicon dioxide ofbase material27.
• Regardless, these and/or other materials can be deposited by any existing or yet-to-be developed techniques. Example silicon-containing precursors for chemical or atomic layer deposition include SiH₄, SiCl₄, SiCl₂H₂, and SiF₄. Example nitrogen-containing precursors include NH₃, NO_x, and N₂. An example boron-containing precursor is B₂H₆. Example carbon-containing precursors include CH₄, CF₄, CH₂F₂, CHF₃, CH₃F, C₄F₆, C₄F₈, C₂F₄, and C₆. Example conditions during deposition within a plasma etcher or a plasma deposition tool include a chuck temperature of from 300° C. to 500° C., pressure from 10 mTorr to 10 Torr, total power of from 500 watts to 2,000 watts and frequencies at one or a combination of 2 MHz and 27 MHz. Regardless, quantity of the atomic components of the composition of bridgingmaterial32 can be controlled by quantity of precursor gases depending on the ultimate desired composition of bridgingmaterial32. Bridgingmaterial32 might be homogenous or non-homogenous.
• Referring toFIG. 7 and in one embodiment, coveringmaterial34 has been formed over those portions of bridgingmaterial32 that are received overbase material27 and acrossbase material openings28. Such might be homogenous or non-homogenous, and regardless may comprise multiple layers.FIG. 7 depicts coveringmaterial34 as comprising fourlayers36,37,38, and39. Any of such materials may be the same or different in composition as one or more components ofbase material27. Anexample material36 is doped silicon dioxide, anexample material37 comprises silicon nitride, and example materials forlayers38 and39 include one or more different organic and/or inorganic antireflective coating layers.
• Referring toFIG. 8,openings40 have been etched through coveringmaterial34 to bridgingmaterial32 received acrossopenings28. First capacitor electrodes will ultimately be formed therein as is described below. Atrench42, corresponding in general outline to trench30, is also shown as having been etched through coveringmaterial34 to bridgingmaterial32.Openings40 andtrench42 are shown as being the same size, shape, and exactly aligned with therespective openings28 andtrench30 over which such lie. However, such may be of different such size and shape, and regardless may not exactly align over the underlying openings and trench.
• Referring toFIG. 9, bridgingmaterial32 has been etched through, through the coveringmaterial openings40 and42.
• In one embodiment, the depicted etching of coveringmaterial openings40 inFIG. 8 is conducted in a suitable processing tool which for convenience in description can be considered as a “second processing tool”. In one embodiment, the second processing tool may be a plasma etcher, for example and by way of example only the LAM Exelan etcher referred to above. Regardless in one embodiment, theFIG. 9 etching is conducted within the very same processing tool used to form coveringmaterial openings40 inFIG. 8, and in one embodiment before removingsubstrate10 therefrom after etching suchcovering material openings40. In one embodiment, the second processing tool may be the very same first processing tool as described above in the one example embodiment where theFIGS. 3,4, and5 processing occurred in the same processing tool. Alternately and by way of example only, the first and second processing tools might be different tools, and whether of the same make and model or of different makes and/or models.
• In one embodiment, etching ofopenings40 through coveringmaterial34 will comprise some suitable etching chemistry which extends the openings to bridgingmaterial32, for example as is shown inFIG. 8. Where, for example, coveringmaterial34 comprises multiple different compositions, some suitable etching chemistry will be used to extendopenings40 to bridgingmaterial32 through the last portion ofsuch covering material34, for example through depictedlayer36. Different chemistries and/or etching conditions might be used for etching the materials received abovelayer36. Regardless, whereportion36 of coveringmaterial34 comprises PSG, an example etching chemistry to etchportion36 and to produce theFIG. 8 construction includes a combination of C₄F₈, O₂and Ar. Regardless, in one embodiment, the act of etching through bridgingmaterial32 as depicted inFIG. 9 comprises continuing, without ceasing, the processing ofsubstrate10 with the etching chemistry at the conclusion of the etching ofopenings40 through coveringmaterial34 as depicted inFIG. 8 effective to etch through bridgingmaterial32 as shown by way of example inFIG. 9. Such may can occur in one embodiment when bridgingmaterial32 is of the same or similar composition to that ofmaterial36, and/or where bridgingmaterial32 is sufficiently thin that punching therethrough can occur without necessarily changing etching chemistry. In one embodiment, such etching also consists essentially of continuing the processing, without ceasing, (for example of the substrate ofFIG. 8) to produce the example substrate ofFIG. 9 also using the very same etching conditions (meaning the combination of pressure, temperature, and any applied power) that were in use at the conclusion of the etching to produce the exampleFIG. 8 construction. Alternately,materials36 and32 may be of different inherent compositions, but capable of being etched with the same etching chemistry.
• Alternately and likely where bridgingmaterial32 comprises a material etchably different in composition from that ofmaterial36, etching of bridgingmaterial32 can comprise changing one or more of etching chemistry and etching conditions from those used in etching coveringmaterial openings40.
• Referring toFIG. 10, aconductive layer52, for example titanium nitride, has been deposited to within coveringmaterial openings40 and withinbase material openings28 in electrical connection withnode locations15,16,17 and18.
• Referring toFIG. 11,conductive layer52 and layers38 and39 have been etched or polished back tolayer37. Such provides, by way of example only, one manner of forming respectivefirst capacitor electrodes55 within coveringmaterial openings40 and within the base material openings in electrical connection withnode locations15,16,17 and18. The depictedfirst capacitor electrodes55 are shown as being container in shape, but could of course be of other configurations whether existing or yet-to-be developed, including for example completely plugging the depicted capacitor openings.
• Referring toFIGS. 12 and 13,etch access openings45 have been formed throughmasking layer37 withincapacitor array area25 effective to exposematerial36 of the covering material withincapacitor array area25. Such leaves elevationally outermost surfaces ofmaterial36 withincircuitry area75 completely covered by maskinglayer37.Etch openings45 provide access for etchant to subsequently etchmaterials36 and34 withincapacitor array area25, if such is desired. Alternately by way of example only, it might be decided/desired to not etchmaterial36 in whichevent openings45 might not be formed andmasking layer37 might not be used.
• Referring toFIG. 14,materials36,32, and24 withincapacitor array area25 have been etched, for example with a liquid etching solution.FIG. 14 depicts but one embodiment wherein one of more etching chemistries has etched all ofmaterials36,32 and24 from withincapacitor array area25. Alternately, less than all or only some of one or more ofmaterials36,32 and24 might be etched. Further and regardless, any etching thereof might be conducted dry or with liquid. An example liquid etchant solution is aqueous, and regardless for example comprising HF, where one or more ofmaterials36,32, and24 is an oxide. One example solution comprises 5:1 to 20:1 water to HF by volume, wherein said HF is a 42 weight percent solution of HF in water. An example etching temperature is room ambient, with an example etching pressure also being room ambient. An example wet etching chemistry that will etch nitride-comprising materials includes H₃PO₄. Further and accordingly where forexample materials36 and24 are predominantly silicon dioxide-comprising and bridgingmaterial32 is predominantly silicon nitride-comprising, etching chemistry might be changed one or more times to completely removematerials36,32, and24 where such removal is desired. Regardless, compositions ofmaterial32 andmaterial37 may be selected to be etchably different and/or of different thicknesses where it is desired thatmaterial37mask material36 withinperiphery circuitry area75 from being etched.
• FIG. 15 illustrates an alternate embodiment to that ofFIG. 14 with respect to a substrate fragment10b. Like numerals from the above described embodiments are utilized where appropriate, with differences being indicated with different numerals or the suffix “b”. InFIG. 15, at least some of bridgingmaterial32 remains betweenadjacent capacitor electrodes55.Material24 is also shown as having been etched away withinarray area25, but alternately some or all of such may remain. Regardless, bridgingmaterial32 might function as a supporting bracing or lattice structure if such remains in the finished circuitry construction. Where it is desired to keep some or all of bridgingmaterial32 and remove some or all ofmaterial24 withinarray area25, portions of bridging material may be etched through to provide etch access tomaterial24, for example much like formation ofetch openings45 inlayer37.
• Referring toFIG. 16, a capacitor dielectric and a second capacitor electrode are formed operatively adjacent the first capacitor electrode with respect to individual capacitors. For example and by way of example only,FIG. 16 depicts the deposition of acapacitor dielectric layer60. By way of example only, example materials are silicon dioxide, silicon nitride, silicon dioxide and silicon nitride composite, or any suitable high-k dielectric, and whether existing or yet-to-be developed. By way of example only, high-k dielectrics include Ta₂O₅and barium strontium titanate.
• An outercapacitor electrode layer70 has been deposited overcapacitor dielectric layer60, thereby definingcapacitors81,82,83 and84. Such are depicted as comprising a common cell capacitor plate to all of the depicted capacitors, for example as might be utilized in DRAM or other circuitry. For example and by way of example only,FIG. 17 depicts an example DRAMcell incorporating capacitor81. Such comprises an example transistorgate word line87 having insulative sidewall spacers, and insulative cap, and a conductive region under the cap such as silicide, a conductive polysilicon region under the silicide, and a gate dielectric region under the polysilicon. Source/drain regions80 are shown formed within semiconductive material operativelyproximate word line87. One of such electrically connects withcapacitor81, and another of such electrically connects withbitline85.
• Regardless and by way of example only, in one embodiment where bridgingmaterial32 comprises nitride, coveringmaterial34 can be etched to expose the nitride-comprising bridging material, withcapacitor dielectric60 andsecond capacitor electrode70 being formed thereover. In one embodiment and as shown,capacitor dielectric60 is formed on nitride-comprisingbridging material32. Regardless in one embodiment, after etching coveringmaterial34 to expose nitride-comprisingbridging material32 received overbase material27 and before formingcapacitor dielectric60 andsecond capacitor electrode70, thebase material27 may be etched, for example in whole or in part.
• In one embodiment, a method of forming a capacitor comprises providing material having an opening therein over a node location on a substrate. A shield comprising nitride-comprising material is provided within and across the opening, with a void being received within the opening above the shield and a void being received within the opening below the shield. By way of example only,FIG. 8 is an example such opening if considering a single of one of the coveringmaterial openings40 in combination with a single of one of thebase material openings28 immediately therebelow, withmaterial32 being provided within and across such opening. The space depicted abovematerial32 constitutes one example void received within the opening above a shield, and the space within the opening belowshield material32 constitutes another example void.
• Etching is conducted within such opening through the shield, withFIG. 9 in but one example depicting an example such etching. After such etching, a first capacitor electrode is formed within the opening in electrical connection with the node location. A capacitor dielectric and a second capacitor electrode are formed operatively adjacent the first capacitor electrode, for example as described above. Any of the above described processing might be utilized in the context of such a method of forming a capacitor.
• In compliance with the statute, the subject matter disclosed herein has been described in language more or less specific as to structural and methodical features. It is to be understood, however, that the claims are not limited to the specific features shown and described, since the means herein disclosed comprise example embodiments. The claims are thus to be afforded full scope as literally worded, and to be appropriately interpreted in accordance with the doctrine of equivalents.

Claims (29)

1. A method of forming a capacitor, comprising:

providing material having an opening therein over a node location on a substrate;

providing a shield within and across the opening with a void being received within the opening above the shield and a void being received within the opening below the shield, the shield comprising a nitride-comprising material;

etching within the opening through the nitride-comprising shield;

after the etching, forming a first capacitor electrode within the opening in electrical connection with the node location; and

forming a capacitor dielectric and a second capacitor electrode operatively adjacent the first capacitor electrode.

2. The method ofclaim 1 wherein the nitride-comprising material comprises at least one of silicon nitride, boron nitride, silicon oxynitride, silicon boron nitride, and silicon carbon nitride.

3. A method of forming a capacitor, comprising:

providing base material having an opening therein over a node location on a substrate;

forming bridging material across the base material opening, the base material opening comprising a void beneath the bridging material, the bridging material comprising a nitride-comprising material;

forming covering material over the base material and the nitride-comprising bridging material;

etching an opening through the covering material to the nitride-comprising bridging material received across the base material opening;

etching through the nitride-comprising bridging material through the covering material opening;

forming a first capacitor electrode within the covering material opening and within the base material opening in electrical connection with the node location; and

forming a capacitor dielectric and a second capacitor electrode operatively adjacent the first capacitor electrode.

4. The method ofclaim 3 comprising depositing the nitride-comprising bridging material over the base material, and forming the covering material over the nitrogen-comprising bridging material which is received over the base material.

5. The method ofclaim 4 comprising after forming the first capacitor electrode and before forming the capacitor dielectric and the second capacitor electrode, etching the covering material to expose the nitride-comprising bridging material received over the base material, and forming the capacitor dielectric and the second capacitor electrode over the nitride-comprising bridging material.

6. The method ofclaim 5 comprising forming the capacitor dielectric on the nitride-comprising bridging material.

7. The method ofclaim 5 comprising after etching the covering material to expose the nitride-comprising bridging material received over the base material and before forming the capacitor dielectric and the second capacitor electrode, etching the base material.

8. A method of forming a capacitor, comprising:

providing base material having an opening therein over a node location on a substrate;

depositing a bridging material over the base material and across the base material opening, the base material opening comprising a void beneath the bridging material;

depositing covering material over the bridging material that is received over the base material and across the base material opening;

etching an opening through the covering material to the bridging material received across the base material opening;

etching through the bridging material through the covering material opening;

forming a first capacitor electrode within the covering material opening and within the base material opening in electrical connection with the node location; and

forming a capacitor dielectric and a second capacitor electrode operatively adjacent the first capacitor electrode.

9. The method ofclaim 8 wherein the bridging material is deposited to be received partially within the base material opening.

10. The method ofclaim 8 wherein the bridging material comprises silicon dioxide.

11. The method ofclaim 10 wherein the silicon dioxide is undoped silicon dioxide.

12. The method ofclaim 10 wherein the base material comprises a nitride received over doped silicon dioxide-comprising material.

13. The method ofclaim 12 wherein the silicon dioxide-comprising bridging material is received on the nitride.

14. The method ofclaim 8 wherein the bridging material comprises a nitride comprising at least one of silicon nitride, boron nitride, silicon oxynitride, silicon boron nitride, and silicon carbon nitride.

15. The method ofclaim 14 wherein the bridging material comprises silicon nitride.

16. The method ofclaim 14 wherein the bridging material comprises boron nitride.

17. The method ofclaim 14 wherein the bridging material comprises silicon oxynitride.

18. The method ofclaim 14 wherein the bridging material comprises silicon boron nitride.

19. The method ofclaim 14 wherein the bridging material comprises silicon carbon nitride.

20. The method ofclaim 8 wherein the etching an opening through the covering material comprises using an etching chemistry to extend the opening to the bridging material, the etching through the bridging material comprising continuing without ceasing processing of the substrate with the etching chemistry at the conclusion of the etching of the opening through the covering material effective to etch through the bridging material.

21. The method ofclaim 8 wherein the etching an opening through the covering material comprises using an etching chemistry and using etching conditions to extend the opening to the bridging material, the etching through the bridging material consisting essentially of continuing without ceasing processing of the substrate with the etching chemistry and with the etching conditions at the conclusion of the etching of the opening through the covering material effective to etch through the bridging material.

22. The method ofclaim 8 wherein the etching the bridging material comprises changing one of etching chemistry and etching conditions from those used in etching the covering material opening.

23. The method ofclaim 22 comprising changing etching chemistry.

24. The method ofclaim 22 comprising changing etching conditions.

25. The method ofclaim 22 comprising changing etching chemistry and etching conditions.

26. A method of forming a capacitor, comprising:

providing base material having an opening therein over a node location on a substrate, the base material comprising silicon dioxide doped with at least one of boron and phosphorus;

depositing a bridging material over the base material and across the base material opening, the base material opening comprising a void beneath the bridging material, the bridging material comprising undoped silicon dioxide;

depositing covering material over the bridging material that is received over the base material and across the base material opening, the covering material comprising silicon dioxide doped with at least one of boron and phosphorus;

etching an opening through the covering material to the bridging material received across the base material opening using an etching chemistry, and etching through the bridging material through the covering material opening by continuing without ceasing processing of the substrate with the etching chemistry at the conclusion of the etching of the opening through the covering material;

forming a first capacitor electrode within the covering material opening and within the base material opening in electrical connection with the node location; and

forming a capacitor dielectric and a second capacitor electrode operatively adjacent the first capacitor electrode.

27. The method ofclaim 26 wherein the undoped silicon dioxide is deposited on the silicon dioxide doped with at least one of boron and phosphorus of the base material.

28. The method ofclaim 26 comprising after forming the first capacitor electrode and before forming the capacitor dielectric and the second capacitor electrode, etching the covering material and the bridging material to expose the base material.

29. The method ofclaim 28 comprising after exposing the base material, etching the base material before forming the capacitor dielectric and the second capacitor electrode.

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