US20140248767A1 - Methods Of Fabricating Integrated Circuitry - Google Patents
Methods Of Fabricating Integrated Circuitry Download PDFInfo
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- US20140248767A1 US20140248767A1 US13/782,213 US201313782213A US2014248767A1 US 20140248767 A1 US20140248767 A1 US 20140248767A1 US 201313782213 A US201313782213 A US 201313782213A US 2014248767 A1 US2014248767 A1 US 2014248767A1
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- tungsten
- conductive material
- conductive line
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- 238000000034 method Methods 0.000 title claims description 32
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 119
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 96
- 239000010937 tungsten Substances 0.000 claims abstract description 96
- 239000004020 conductor Substances 0.000 claims abstract description 47
- 239000003989 dielectric material Substances 0.000 claims abstract description 33
- 239000012811 non-conductive material Substances 0.000 claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000000151 deposition Methods 0.000 claims description 61
- 239000000758 substrate Substances 0.000 claims description 32
- 230000008021 deposition Effects 0.000 claims description 29
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 14
- 239000010936 titanium Substances 0.000 claims description 14
- 229910052719 titanium Inorganic materials 0.000 claims description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 13
- 229910052802 copper Inorganic materials 0.000 claims description 13
- 239000010949 copper Substances 0.000 claims description 13
- 238000005229 chemical vapour deposition Methods 0.000 claims description 12
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 7
- 238000000231 atomic layer deposition Methods 0.000 claims description 6
- 239000002243 precursor Substances 0.000 claims description 6
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 4
- 238000005240 physical vapour deposition Methods 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims 1
- 239000000463 material Substances 0.000 description 18
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000059 patterning Methods 0.000 description 3
- 238000000429 assembly Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 150000002736 metal compounds Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005234 chemical deposition Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 229910000078 germane Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000005289 physical deposition Methods 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/522—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
- H01L23/528—Geometry or layout of the interconnection structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table
- H01L21/28556—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table by chemical means, e.g. CVD, LPCVD, PECVD, laser CVD
- H01L21/28562—Selective deposition
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76843—Barrier, adhesion or liner layers formed in openings in a dielectric
- H01L21/76849—Barrier, adhesion or liner layers formed in openings in a dielectric the layer being positioned on top of the main fill metal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76877—Filling of holes, grooves or trenches, e.g. vias, with conductive material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/522—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
- H01L23/5226—Via connections in a multilevel interconnection structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/522—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
- H01L23/532—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body characterised by the materials
- H01L23/53204—Conductive materials
- H01L23/53209—Conductive materials based on metals, e.g. alloys, metal silicides
- H01L23/53228—Conductive materials based on metals, e.g. alloys, metal silicides the principal metal being copper
- H01L23/53238—Additional layers associated with copper layers, e.g. adhesion, barrier, cladding layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/522—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
- H01L23/532—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body characterised by the materials
- H01L23/53204—Conductive materials
- H01L23/53209—Conductive materials based on metals, e.g. alloys, metal silicides
- H01L23/53257—Conductive materials based on metals, e.g. alloys, metal silicides the principal metal being a refractory metal
- H01L23/53266—Additional layers associated with refractory-metal layers, e.g. adhesion, barrier, cladding layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- Embodiments disclosed herein pertain to methods of fabricating integrated circuitry.
- Integrated circuitry fabrication continues to make ever smaller features to minimize the size of individual device components and thereby increase density of the components within an integrated circuit.
- One common component in integrated circuitry is a longitudinally elongated electrically conductive line, for example a global or local interconnect line.
- Such lines may be formed by subtractive patterning and etch of conductive material.
- a trench having a desired longitudinal outline of the conductive line may be formed in semiconductive or other material. Then, the trench may be wholly or partially filled with conductive material. The conductive material received laterally outward of the trench is then removed. Elemental metals, metal alloys, and conductive metal compounds are commonly used as materials of conductive interconnect lines.
- Conductive interconnect lines may be formed at different levels or elevations relative to a substrate. Additionally, those lines at different levels may need to be conductively interconnected. One manner of doing so includes forming dielectric material over lower or inner fabricated interconnect lines. Via openings are then formed there-through to the underlying line or lines, and are subsequently filled with conductive material. Conductive lines are then formed outward of the dielectric material and which electrically couple with the conductive material that is within the via openings.
- FIG. 1 is an isometric view of a substrate in process in accordance with an embodiment of the invention.
- FIG. 2 is a view of the FIG. 1 substrate at a processing step subsequent to that shown by FIG. 1 .
- FIG. 3 is a view of the FIG. 2 substrate at a processing step subsequent to that shown by FIG. 2 .
- FIG. 4 is a view of the FIG. 3 substrate at a processing step subsequent to that shown by FIG. 3 .
- FIG. 5 is a cross-sectional view of the FIG. 4 substrate at a processing step subsequent to that shown by FIG. 4 .
- FIG. 6 is a view of the FIG. 5 substrate at a processing step subsequent to that shown by FIG. 5 .
- FIG. 7 is an isometric view of the FIG. 6 substrate at a processing step subsequent to that shown by FIG. 6 .
- a substrate fragment 10 is shown, and may comprise a semiconductor substrate.
- 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).
- substrate refers to any supporting structure, including, but not limited to, the semiconductive substrates described above.
- Example substrate 10 comprises dielectric material 12 , for example doped silicon dioxide, undoped silicon dioxide, and/or silicon nitride. Any of the materials and/or structures described herein may be homogenous or non-homogenous. Further, each may be formed using any suitable or yet-to-be-developed technique, with atomic layer deposition, chemical vapor deposition, physical vapor deposition, epitaxial growth, diffusion doping, and ion implanting being examples. Other partially or wholly fabricated components of integrated circuitry would likely be elevationally inward of dielectric material 12 , and are not particularly germane to the inventions disclosed herein.
- a first conductive line 14 has been formed relative to substrate 10 . Multiple such lines would likely be fabricated, with only a single line being shown.
- First conductive line 14 may be formed by any existing or yet-to-be-developed manner, configuration, and/or orientation, with a longitudinally elongated and horizontal orientation and construction being shown.
- horizontal refers to a general direction along a primary surface relative to which the substrate is processed during fabrication, and vertical is a direction generally orthogonal thereto.
- vertical and “horizontal” as used herein are generally perpendicular directions relative one another independent of orientation of the substrate in three-dimensional space.
- “elevational” and “elevationally” are with reference to the vertical direction relative to a base substrate upon which the circuitry has been fabricated.
- Conductive line 14 may be fabricated of any suitable conductive material(s). In one embodiment, at least a majority of conductive line 14 comprises, consists essentially of, or consists of one or more of elemental metal(s), alloys of two or more elemental metals, and/or conductive metal compounds. In one embodiment and as shown, first conductive line 14 comprises an exterior lining 16 (e.g., elemental tantalum) surrounding a different composition central and majority material 18 (e.g., elemental copper). As used herein, “different composition” only requires those portions of two stated materials that may be directly against one another to be chemically and/or physically different, for example if such materials are not homogenous.
- “different composition” only requires that those portions of the two stated materials that are closest to one another be chemically and/or physically different if such materials are not homogenous.
- a material or structure is “directly against” another when there is at least some physical touching contact of the stated materials or structures relative one another.
- “over”, “on”, and “against” not preceded by “directly” encompass “directly against” as well as construction where intervening material(s) or structure(s) result(s) in no physical touching contact of the stated materials or structures relative one another.
- first conductive line 14 comprises an elevationally outermost surface 20 which in one embodiment comprises copper, and in one embodiment comprises elemental copper. In one embodiment, outermost surface 20 is planar. In one embodiment, dielectric material 12 comprises exposed non-conductive material that is provided laterally of first conductive line 14 . In one embodiment, non-conductive material 12 has a planar elevationally outermost surface 22 which in one embodiment is coplanar with planar outermost surface 20 of first conductive line 14 .
- first elemental tungsten 24 has been deposited directly against elevationally outermost surface 20 of first conductive line 14 , and thereby comprises a part of the conductive material of first conductive line 14 .
- first elemental tungsten 24 is deposited directly against a copper-comprising surface of first conductive line 14 along at least a majority of longitudinal length of first conductive line 14 .
- First elemental tungsten 24 may be deposited continuously along first conductive line 14 and along at least a majority of its length, for example as shown.
- the first elemental tungsten may be deposited at one or more spaced locations along the line (not shown) as opposed to continuously there-along.
- first elemental tungsten 24 is deposited selectively to first conductive line 14 relative to any, if any, exposed non-conductive material.
- selective and selectively requires a deposition of elemental tungsten relative to any, if any, exposed non-conductive material at a deposition rate of at least 5:1, wherein a non-selective deposition is at a ratio less than 5:.
- any elemental tungsten deposited on non-conductive material is insufficient to cause an interconnected short or to cause undesired leakage.
- FIG. 2 shows an example embodiment wherein no tungsten deposits on exposed outermost surface 22 of non-conductive material 12 .
- An example total elevational deposition thickness for first tungsten 24 is from about 50 Angstroms to about 500 Angstroms.
- the selective depositing of the first elemental tungsten is by chemical vapor deposition within a deposition chamber using gaseous WF 6 and SiH 4 as deposition precursors which are fed to the chamber during the deposition. Inert and/or other gases may be fed to the chamber during the deposition.
- substrate temperature is from about 250° C. to about 350° C.
- chamber pressure is from about 1 mTorr to about 100 mTorr
- WF 6 flow rate to the chamber is from about 10 sccm to about 1,000 sccm
- SiH 4 flow rate to the chamber is from about 5 sccm to about 50 sccm.
- An example inert gas flow rate e.g., Ar
- Flow rates provided herein are ideally to or at the substrate independent of chamber volume.
- the selective depositing of the first elemental tungsten is by chemical vapor deposition within a deposition chamber using gaseous WF 6 and H 2 as deposition precursors which are fed to the chamber during the deposition. Inert and/or other gases may be fed to the chamber during the deposition.
- substrate temperature is from about 300° C. to about 450° C.
- chamber pressure is from about 20 Torr to about 250 Torr
- WF 6 flow rate to the chamber is from about 100 sccm to about 500 sccm
- H 2 flow rate to the chamber is from about 1,000 sccm to about 30,000 sccm.
- An example inert gas flow rate (e.g., Ar) is from 0 sccm to about 1,000 sccm.
- dielectric material 30 has been formed elevationally over first conductive line 14 , and in one embodiment directly against first tungsten 24 and in one embodiment over and/or directly against non-conductive material 12 .
- Dielectric material 30 may be of the same composition as that of non-conductive material 12 or may be of different composition from that of non-conductive material 12 .
- a via 32 has been formed through dielectric material 30 to conductive material of first conductive line 14 at a location where first tungsten 24 was deposited directly there-against.
- via 32 has been formed through dielectric material 30 to first tungsten 24 .
- one or more than one via may be formed to an individual first conductive line 14 .
- An example technique of forming via 32 is by photolithographic patterning followed by subsequent anisotropic etch of dielectric material 30 .
- conductive material 34 has been formed directly against first tungsten 24 after forming via 32 .
- conductive material 34 comprises a liner within and over sidewalls of via 32 , is directly against first tungsten 24 , and is elevationally over dielectric material 30 .
- Example conductive materials 34 include one or both TiN and WN ideally deposited by at least one of chemical vapor deposition and atomic layer deposition.
- Another example conductive material 34 is physical vapor deposited elemental tungsten.
- conductive material 34 may comprise, consist essentially of, or consist of at least one of TiN, WN, and physical vapor deposited elemental tungsten.
- second elemental tungsten 40 has been non-selectively deposited to within via 32 (i.e., at a deposition rate of less than 5 : 1 within the via versus laterally outward of the via) and electrically couples to first conductive line 14 .
- the second elemental tungsten is deposited at a deposition rate of about 1:1 within the via versus laterally outward of the via.
- second elemental tungsten 40 is directly against conductive material 34 .
- second tungsten 40 also non-selectively deposits elevationally over that portion of conductive material 34 that is elevationally over dielectric material 30 .
- Second elemental tungsten 40 may be of the same physical composition as first tungsten 24 or may be of different physical composition while still maintaining a common elemental tungsten chemical composition.
- An example non-selective deposition technique for second elemental tungsten 40 is by chemical vapor deposition within a deposition chamber.
- a more specific example includes using gaseous WF 6 and H 2 as deposition precursors fed to the chamber at respective flow rates from about 100 sccm to about 500 sccm and 1,000 sccm to about 30,000 sccm, substrate temperature from about 300° C. to about 450° C., and chamber pressure from about 20 Torr to about 250 Torr. Additional inert and/or reactive gas might also be flowed to the chamber.
- An example inert gas (e.g., Ar) flow rate is from 0 sccm to about 50,000 sccm.
- FIG. 6 shows an example embodiment wherein second tungsten 40 is not deposited directly against first tungsten 24 .
- first tungsten 24 may be removed (not shown), and/or wholly or partially transformed to another conductive material (e.g., a silicide) prior to formation of via 32 (not shown), or after formation of via 32 (not shown) prior to depositing second elemental tungsten 40
- another conductive material e.g., a silicide
- a second conductive line is formed elevationally outward of and electrically coupled to the second tungsten that is within the via. Such may occur by a number of manners.
- conductive materials 34 and 40 of FIG. 6 may be deposited to a suitable desired deposition thickness and thereafter subtractively patterned (e.g., by photolithographic patterning and subsequent etch) to form a desired second conductive line.
- second tungsten 40 and conductive material liner 34 may be removed back at least to expose dielectric material 30 .
- conductive material 42 may be deposited directly against second tungsten 40 and liner 34 .
- Conductive material 42 forms a second conductive line 44 which may be of the same or different composition as that of first conductive line 14 , and may be formed in the same manner as line 14 or in other manners.
- An embodiment of the invention encompasses forming a first conductive line and depositing first elemental tungsten directly against an elevationally outer surface thereof selectively relative to any exposed non-conductive material.
- exposed non-conductive material need not be present during the depositing of the first elemental tungsten directly against an elevationally outer surface of first conductive line.
- deposition of the first elemental tungsten occurs selectively to the line in comparison to the exposed non-conductive material.
- the first elemental tungsten may or may not deposit all along the first conductive line, for example depending on whether all or a portion of elevationally or other outer surfaces thereof are exposed.
- dielectric material is formed elevationally over the first conductive line and regardless of presence of non-conductive material laterally thereof.
- a via is formed through the dielectric material to conductive material of the first conductive line at a location where the first tungsten was deposited. Such via formation may occur regardless of whether the first tungsten remains as initially deposited, has been wholly or partially removed, or has been replaced or transformed into another conductive material which may or may not comprise tungsten.
- second elemental tungsten is non-selectively deposited to within the via and electrically couples to the first conductive line independent of whether another conductive material has been provided between the second tungsten and the first conductive line.
- a second conductive line is formed elevationally outward of and electrically couples to the second tungsten which is within the via.
- a predecessor process to those in accordance with the invention sputter-deposited (i.e., physical vapor deposited) elemental titanium into a via formed in dielectric material and that extended to a conductive elemental copper-comprising line. That titanium was deposited as a liner, and titanium nitride was sputter-deposited thereover as an additional conductive liner.
- the titanium enhances interface properties between the titanium nitride and copper, such as improving adhesion between titanium nitride and copper than would otherwise occur in the absence of titanium.
- Physical vapor deposition of each of titanium and titanium nitride may not achieve desirable step coverage particularly in very small openings and/or in those having high aspect ratios.
- titanium and titanium nitride are typically physical vapor deposited using elemental titanium targets.
- An inert gas e.g., Ar
- the sputtering source for depositing elemental titanium
- nitrogen gas is used as the sputter source for TiN.
- the target typically needs to be cleaned after sputter depositing titanium nitride to return the target surface to pure titanium to avoid a subsequent titanium nitride layer from being deposited before sputter depositing titanium.
- two different chambers may be used for depositing titanium and titanium nitride.
- a method of fabricating integrated circuitry relative to a substrate is devoid of depositing elemental titanium directly against elemental copper of the first conductive line.
- Physical, chemical, or atomic layer deposition may be used in deposition of conductive materials in accordance with embodiments of the invention, with chemical vapor deposition or atomic layer deposition being ideal.
- a method of fabricating integrated circuitry comprises forming a first conductive line.
- First elemental tungsten is deposited directly against an elevationally outer surface of the first conductive line selectively relative to any exposed non-conductive material.
- Dielectric material is formed elevationally over the first conductive line and a via is formed there-through to conductive material of the first conductive line at a location where the first tungsten was deposited.
- Second elemental tungsten is non-selectively deposited to within the via and electrically couples to the first conductive line.
- a second conductive line is formed elevationally outward of and electrically coupled to the second tungsten that is within the via.
- a method of fabricating integrated circuitry comprises forming a first conductive line having an elevationally outermost surface comprising copper. An exposed non-conductive material is provided laterally of the first conductive line. First elemental tungsten is deposited directly against the copper-comprising surface along at least a majority of longitudinal length of the first conductive line. The first tungsten is deposited selectively to the first conductive line relative to the exposed non-conductive material. Dielectric material is formed elevationally over and directly against the first tungsten and a via is formed through the dielectric material to the first tungsten. A conductive material is formed directly against the first tungsten after forming the via. Second elemental tungsten is non-selectively deposited to within the via directly against the conductive material. A second conductive line is formed elevationally outward of and electrically coupled to the second tungsten that is within the via.
- a method of fabricating integrated circuitry comprises forming a first conductive line having a planar elevationally outermost surface at least a majority of which comprises elemental copper.
- Non-conductive material is provided laterally of the first conductive line.
- the non-conductive material has a planar elevationally outermost surface that is coplanar with the planar outermost surface of the first conductive line.
- First elemental tungsten is deposited directly against the copper-comprising surface along at least a majority of longitudinal length of the first conductive line.
- the first tungsten is deposited selectively to the first conductive line relative to the coplanar outermost surface of the non-conductive material.
- Dielectric material is formed elevationally over and directly against the first tungsten and the non-conductive material.
- a via is formed through the dielectric material to the first tungsten.
- a conductive material liner is formed within the via over sidewalls of the via, within the via directly against the first tungsten, and elevationally over the dielectric material.
- Second elemental tungsten is non-selectively deposited to within the via directly against the conductive material liner and elevationally over that portion of the conductive material liner that is elevationally over the dielectric material.
- a second conductive line is formed elevationally outward of and electrically coupled to the second tungsten that is within the via.
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- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
Abstract
A method of fabricating integrated circuitry includes forming a first conductive line. First elemental tungsten is deposited directly against an elevationally outer surface of the first conductive line selectively relative to any exposed non-conductive material. Dielectric material is formed elevationally over the first conductive line and a via is formed there-through to conductive material of the first conductive line at a location where the first tungsten was deposited. Second elemental tungsten is non-selectively deposited to within the via and electrically couples to the first conductive line. A second conductive line is formed elevationally outward of and electrically coupled to the second tungsten that is within the via.
Description
- Embodiments disclosed herein pertain to methods of fabricating integrated circuitry.
- Integrated circuitry fabrication continues to make ever smaller features to minimize the size of individual device components and thereby increase density of the components within an integrated circuit. One common component in integrated circuitry is a longitudinally elongated electrically conductive line, for example a global or local interconnect line. Such lines may be formed by subtractive patterning and etch of conductive material. Alternately, a trench having a desired longitudinal outline of the conductive line may be formed in semiconductive or other material. Then, the trench may be wholly or partially filled with conductive material. The conductive material received laterally outward of the trench is then removed. Elemental metals, metal alloys, and conductive metal compounds are commonly used as materials of conductive interconnect lines.
- Conductive interconnect lines may be formed at different levels or elevations relative to a substrate. Additionally, those lines at different levels may need to be conductively interconnected. One manner of doing so includes forming dielectric material over lower or inner fabricated interconnect lines. Via openings are then formed there-through to the underlying line or lines, and are subsequently filled with conductive material. Conductive lines are then formed outward of the dielectric material and which electrically couple with the conductive material that is within the via openings.
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FIG. 1 is an isometric view of a substrate in process in accordance with an embodiment of the invention. -
FIG. 2 is a view of theFIG. 1 substrate at a processing step subsequent to that shown byFIG. 1 . -
FIG. 3 is a view of theFIG. 2 substrate at a processing step subsequent to that shown byFIG. 2 . -
FIG. 4 is a view of theFIG. 3 substrate at a processing step subsequent to that shown byFIG. 3 . -
FIG. 5 is a cross-sectional view of theFIG. 4 substrate at a processing step subsequent to that shown byFIG. 4 . -
FIG. 6 is a view of theFIG. 5 substrate at a processing step subsequent to that shown byFIG. 5 . -
FIG. 7 is an isometric view of theFIG. 6 substrate at a processing step subsequent to that shown byFIG. 6 . - Example embodiments of methods of fabricating integrated circuitry in accordance with the invention are described with reference to
FIGS. 1-7 . Referring toFIG. 1 , asubstrate fragment 10 is shown, and may comprise a semiconductor substrate. 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.Example substrate 10 comprisesdielectric material 12, for example doped silicon dioxide, undoped silicon dioxide, and/or silicon nitride. Any of the materials and/or structures described herein may be homogenous or non-homogenous. Further, each may be formed using any suitable or yet-to-be-developed technique, with atomic layer deposition, chemical vapor deposition, physical vapor deposition, epitaxial growth, diffusion doping, and ion implanting being examples. Other partially or wholly fabricated components of integrated circuitry would likely be elevationally inward ofdielectric material 12, and are not particularly germane to the inventions disclosed herein. - A first
conductive line 14 has been formed relative tosubstrate 10. Multiple such lines would likely be fabricated, with only a single line being shown. Firstconductive line 14 may be formed by any existing or yet-to-be-developed manner, configuration, and/or orientation, with a longitudinally elongated and horizontal orientation and construction being shown. In this document, horizontal refers to a general direction along a primary surface relative to which the substrate is processed during fabrication, and vertical is a direction generally orthogonal thereto. Further, “vertical” and “horizontal” as used herein are generally perpendicular directions relative one another independent of orientation of the substrate in three-dimensional space. Further in this document, “elevational” and “elevationally” are with reference to the vertical direction relative to a base substrate upon which the circuitry has been fabricated. -
Conductive line 14 may be fabricated of any suitable conductive material(s). In one embodiment, at least a majority ofconductive line 14 comprises, consists essentially of, or consists of one or more of elemental metal(s), alloys of two or more elemental metals, and/or conductive metal compounds. In one embodiment and as shown, firstconductive line 14 comprises an exterior lining 16 (e.g., elemental tantalum) surrounding a different composition central and majority material 18 (e.g., elemental copper). As used herein, “different composition” only requires those portions of two stated materials that may be directly against one another to be chemically and/or physically different, for example if such materials are not homogenous. If the two stated materials are not directly against one another, “different composition” only requires that those portions of the two stated materials that are closest to one another be chemically and/or physically different if such materials are not homogenous. In this document, a material or structure is “directly against” another when there is at least some physical touching contact of the stated materials or structures relative one another. In contrast, “over”, “on”, and “against” not preceded by “directly”, encompass “directly against” as well as construction where intervening material(s) or structure(s) result(s) in no physical touching contact of the stated materials or structures relative one another. - Regardless, first
conductive line 14 comprises an elevationallyoutermost surface 20 which in one embodiment comprises copper, and in one embodiment comprises elemental copper. In one embodiment,outermost surface 20 is planar. In one embodiment,dielectric material 12 comprises exposed non-conductive material that is provided laterally of firstconductive line 14. In one embodiment,non-conductive material 12 has a planar elevationallyoutermost surface 22 which in one embodiment is coplanar with planaroutermost surface 20 of firstconductive line 14. - Referring to
FIG. 2 , firstelemental tungsten 24 has been deposited directly against elevationallyoutermost surface 20 of firstconductive line 14, and thereby comprises a part of the conductive material of firstconductive line 14. In one embodiment, firstelemental tungsten 24 is deposited directly against a copper-comprising surface of firstconductive line 14 along at least a majority of longitudinal length of firstconductive line 14. Firstelemental tungsten 24 may be deposited continuously along firstconductive line 14 and along at least a majority of its length, for example as shown. In one embodiment, the first elemental tungsten may be deposited at one or more spaced locations along the line (not shown) as opposed to continuously there-along. Regardless, firstelemental tungsten 24 is deposited selectively to firstconductive line 14 relative to any, if any, exposed non-conductive material. In the context of this document, selective and selectively requires a deposition of elemental tungsten relative to any, if any, exposed non-conductive material at a deposition rate of at least 5:1, wherein a non-selective deposition is at a ratio less than 5:. Ideally, any elemental tungsten deposited on non-conductive material is insufficient to cause an interconnected short or to cause undesired leakage.FIG. 2 shows an example embodiment wherein no tungsten deposits on exposedoutermost surface 22 ofnon-conductive material 12. An example total elevational deposition thickness forfirst tungsten 24 is from about 50 Angstroms to about 500 Angstroms. - In one embodiment, the selective depositing of the first elemental tungsten is by chemical vapor deposition within a deposition chamber using gaseous WF6 and SiH4 as deposition precursors which are fed to the chamber during the deposition. Inert and/or other gases may be fed to the chamber during the deposition. In one embodiment during the deposition, substrate temperature is from about 250° C. to about 350° C., chamber pressure is from about 1 mTorr to about 100 mTorr, WF6 flow rate to the chamber is from about 10 sccm to about 1,000 sccm, and SiH4 flow rate to the chamber is from about 5 sccm to about 50 sccm. An example inert gas flow rate (e.g., Ar) is from 0 sccm to about 1,000 sccm. Flow rates provided herein are ideally to or at the substrate independent of chamber volume.
- In one embodiment, the selective depositing of the first elemental tungsten is by chemical vapor deposition within a deposition chamber using gaseous WF6 and H2 as deposition precursors which are fed to the chamber during the deposition. Inert and/or other gases may be fed to the chamber during the deposition. In one embodiment during the deposition, substrate temperature is from about 300° C. to about 450° C., chamber pressure is from about 20 Torr to about 250 Torr, WF6 flow rate to the chamber is from about 100 sccm to about 500 sccm, and H2 flow rate to the chamber is from about 1,000 sccm to about 30,000 sccm. An example inert gas flow rate (e.g., Ar) is from 0 sccm to about 1,000 sccm.
- Referring to
FIG. 3 ,dielectric material 30 has been formed elevationally over firstconductive line 14, and in one embodiment directly againstfirst tungsten 24 and in one embodiment over and/or directly againstnon-conductive material 12.Dielectric material 30 may be of the same composition as that ofnon-conductive material 12 or may be of different composition from that ofnon-conductive material 12. - Referring to
FIG. 4 , a via 32 has been formed throughdielectric material 30 to conductive material of firstconductive line 14 at a location wherefirst tungsten 24 was deposited directly there-against. In one embodiment and as shown, via 32 has been formed throughdielectric material 30 tofirst tungsten 24. Regardless, one or more than one via may be formed to an individual firstconductive line 14. An example technique of forming via 32 is by photolithographic patterning followed by subsequent anisotropic etch ofdielectric material 30. - Referring to
FIG. 5 , and in one embodiment,conductive material 34 has been formed directly againstfirst tungsten 24 after forming via 32. In one embodiment,conductive material 34 comprises a liner within and over sidewalls of via 32, is directly againstfirst tungsten 24, and is elevationally overdielectric material 30. Exampleconductive materials 34 include one or both TiN and WN ideally deposited by at least one of chemical vapor deposition and atomic layer deposition. Another exampleconductive material 34 is physical vapor deposited elemental tungsten. Regardless,conductive material 34 may comprise, consist essentially of, or consist of at least one of TiN, WN, and physical vapor deposited elemental tungsten. - Referring to
FIG. 6 , secondelemental tungsten 40 has been non-selectively deposited to within via 32 (i.e., at a deposition rate of less than 5:1 within the via versus laterally outward of the via) and electrically couples to firstconductive line 14. In one embodiment, the second elemental tungsten is deposited at a deposition rate of about 1:1 within the via versus laterally outward of the via. In one embodiment and as shown, secondelemental tungsten 40 is directly againstconductive material 34. In one embodiment whereconductive material 34 has been deposited in the form of a lining that extends elevationally overdielectric material 30,second tungsten 40 also non-selectively deposits elevationally over that portion ofconductive material 34 that is elevationally overdielectric material 30. Secondelemental tungsten 40 may be of the same physical composition asfirst tungsten 24 or may be of different physical composition while still maintaining a common elemental tungsten chemical composition. An example non-selective deposition technique for secondelemental tungsten 40 is by chemical vapor deposition within a deposition chamber. A more specific example includes using gaseous WF6 and H2 as deposition precursors fed to the chamber at respective flow rates from about 100 sccm to about 500 sccm and 1,000 sccm to about 30,000 sccm, substrate temperature from about 300° C. to about 450° C., and chamber pressure from about 20 Torr to about 250 Torr. Additional inert and/or reactive gas might also be flowed to the chamber. An example inert gas (e.g., Ar) flow rate is from 0 sccm to about 50,000 sccm. Regardless,FIG. 6 shows an example embodiment whereinsecond tungsten 40 is not deposited directly againstfirst tungsten 24. Some or all offirst tungsten 24 may be removed (not shown), and/or wholly or partially transformed to another conductive material (e.g., a silicide) prior to formation of via 32 (not shown), or after formation of via 32 (not shown) prior to depositing secondelemental tungsten 40 - A second conductive line is formed elevationally outward of and electrically coupled to the second tungsten that is within the via. Such may occur by a number of manners. For example,
conductive materials FIG. 6 may be deposited to a suitable desired deposition thickness and thereafter subtractively patterned (e.g., by photolithographic patterning and subsequent etch) to form a desired second conductive line. Alternately, for example as shown inFIG. 7 ,second tungsten 40 andconductive material liner 34 may be removed back at least to exposedielectric material 30. Thereafter and as shown,conductive material 42 may be deposited directly againstsecond tungsten 40 andliner 34.Conductive material 42 forms a secondconductive line 44 which may be of the same or different composition as that of firstconductive line 14, and may be formed in the same manner asline 14 or in other manners. - An embodiment of the invention encompasses forming a first conductive line and depositing first elemental tungsten directly against an elevationally outer surface thereof selectively relative to any exposed non-conductive material. In other words, exposed non-conductive material need not be present during the depositing of the first elemental tungsten directly against an elevationally outer surface of first conductive line. Yet if exposed non-conductive material is present, deposition of the first elemental tungsten occurs selectively to the line in comparison to the exposed non-conductive material. Further and regardless, the first elemental tungsten may or may not deposit all along the first conductive line, for example depending on whether all or a portion of elevationally or other outer surfaces thereof are exposed. Regardless, dielectric material is formed elevationally over the first conductive line and regardless of presence of non-conductive material laterally thereof. A via is formed through the dielectric material to conductive material of the first conductive line at a location where the first tungsten was deposited. Such via formation may occur regardless of whether the first tungsten remains as initially deposited, has been wholly or partially removed, or has been replaced or transformed into another conductive material which may or may not comprise tungsten. Regardless, second elemental tungsten is non-selectively deposited to within the via and electrically couples to the first conductive line independent of whether another conductive material has been provided between the second tungsten and the first conductive line. A second conductive line is formed elevationally outward of and electrically couples to the second tungsten which is within the via.
- A predecessor process to those in accordance with the invention sputter-deposited (i.e., physical vapor deposited) elemental titanium into a via formed in dielectric material and that extended to a conductive elemental copper-comprising line. That titanium was deposited as a liner, and titanium nitride was sputter-deposited thereover as an additional conductive liner. The titanium enhances interface properties between the titanium nitride and copper, such as improving adhesion between titanium nitride and copper than would otherwise occur in the absence of titanium. Physical vapor deposition of each of titanium and titanium nitride may not achieve desirable step coverage particularly in very small openings and/or in those having high aspect ratios. Further, titanium and titanium nitride are typically physical vapor deposited using elemental titanium targets. An inert gas (e.g., Ar) is typically used as the sputtering source for depositing elemental titanium, and nitrogen gas is used as the sputter source for TiN. If sputter depositing elemental titanium in the same chamber in which titanium nitride is sputter-deposited, the target typically needs to be cleaned after sputter depositing titanium nitride to return the target surface to pure titanium to avoid a subsequent titanium nitride layer from being deposited before sputter depositing titanium. Alternately, two different chambers may be used for depositing titanium and titanium nitride. Regardless, in accordance with one embodiment of the invention, a method of fabricating integrated circuitry relative to a substrate is devoid of depositing elemental titanium directly against elemental copper of the first conductive line.
- Physical, chemical, or atomic layer deposition may be used in deposition of conductive materials in accordance with embodiments of the invention, with chemical vapor deposition or atomic layer deposition being ideal.
- In some embodiments, a method of fabricating integrated circuitry comprises forming a first conductive line. First elemental tungsten is deposited directly against an elevationally outer surface of the first conductive line selectively relative to any exposed non-conductive material. Dielectric material is formed elevationally over the first conductive line and a via is formed there-through to conductive material of the first conductive line at a location where the first tungsten was deposited. Second elemental tungsten is non-selectively deposited to within the via and electrically couples to the first conductive line. A second conductive line is formed elevationally outward of and electrically coupled to the second tungsten that is within the via.
- In some embodiments, a method of fabricating integrated circuitry comprises forming a first conductive line having an elevationally outermost surface comprising copper. An exposed non-conductive material is provided laterally of the first conductive line. First elemental tungsten is deposited directly against the copper-comprising surface along at least a majority of longitudinal length of the first conductive line. The first tungsten is deposited selectively to the first conductive line relative to the exposed non-conductive material. Dielectric material is formed elevationally over and directly against the first tungsten and a via is formed through the dielectric material to the first tungsten. A conductive material is formed directly against the first tungsten after forming the via. Second elemental tungsten is non-selectively deposited to within the via directly against the conductive material. A second conductive line is formed elevationally outward of and electrically coupled to the second tungsten that is within the via.
- In some embodiments, a method of fabricating integrated circuitry comprises forming a first conductive line having a planar elevationally outermost surface at least a majority of which comprises elemental copper. Non-conductive material is provided laterally of the first conductive line. The non-conductive material has a planar elevationally outermost surface that is coplanar with the planar outermost surface of the first conductive line. First elemental tungsten is deposited directly against the copper-comprising surface along at least a majority of longitudinal length of the first conductive line. The first tungsten is deposited selectively to the first conductive line relative to the coplanar outermost surface of the non-conductive material. Dielectric material is formed elevationally over and directly against the first tungsten and the non-conductive material. A via is formed through the dielectric material to the first tungsten. A conductive material liner is formed within the via over sidewalls of the via, within the via directly against the first tungsten, and elevationally over the dielectric material. Second elemental tungsten is non-selectively deposited to within the via directly against the conductive material liner and elevationally over that portion of the conductive material liner that is elevationally over the dielectric material. A second conductive line is formed elevationally outward of and electrically coupled to the second tungsten that is within the via.
- 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 (27)
1. A method of fabricating integrated circuitry, comprising:
forming a first conductive line;
depositing first elemental tungsten directly against an elevationally outer surface of the first conductive line selectively relative to any exposed non-conductive material;
forming dielectric material elevationally over the first conductive line and forming a via there-through to conductive material of the first conductive line at a location where the first tungsten was deposited;
non-selectively depositing second elemental tungsten to within the via and which electrically couples to the first conductive line; and
forming a second conductive line elevationally outward of and electrically coupled to the second tungsten that is within the via.
2. The method of claim 1 wherein at least a majority of the first conductive line is elemental copper.
3. The method of claim 1 wherein the second elemental tungsten is deposited at a deposition rate of about 1:1 within the via versus laterally outward of the via.
4. The method of claim 1 wherein the fabricating is relative to a substrate, and comprising providing exposed non-conductive material on the substrate during the selective depositing.
5. The method of claim 4 wherein no tungsten deposits on the exposed non-conductive material during the selective depositing.
6. The method of claim 5 wherein the second elemental tungsten is deposited at a deposition rate of about 1:1 within the via versus laterally outward of the via.
7. The method of claim 1 wherein the first tungsten is deposited to a total elevational thickness from about 50 Angstroms to about 500 Angstroms.
8. The method of claim 1 wherein the second tungsten is not deposited directly against the first tungsten.
9. The method of claim 1 comprising forming a conductive material liner within the via over sidewalls of the via and elevationally over the first tungsten before the non-selectively depositing of the second tungsten.
10. The method of claim 9 comprising forming the conductive material liner to comprise TiN.
11. The method of claim 10 comprising forming the TiN by at least one of chemical vapor deposition and atomic layer deposition.
12. The method of claim 9 comprising forming the conductive material liner to comprise WN.
13. The method of claim 12 comprising forming the WN by at least one of chemical vapor deposition and atomic layer deposition.
14. The method of claim 9 comprising forming the conductive material liner to comprise physical vapor deposited elemental tungsten.
15. The method of claim 1 wherein at least a majority of the first conductive line is elemental copper, the method being devoid of depositing elemental titanium directly against elemental copper of the first conductive line.
16. The method of claim 1 wherein the selectively depositing is by chemical vapor deposition within a deposition chamber, gaseous WF6 and SiH4 comprising deposition precursors fed to the chamber during said selectively depositing.
17. The method of claim 16 wherein the fabricating is relative to a substrate, and comprising substrate temperature from about 250° C. to about 350° C., chamber pressure from about 1 mTorr to about 100 mTorr, WF6 flow rate to the chamber from about 10 sccm to about 1,000 sccm, and SiH4 flow rate to the chamber from about 5 sccm to about 50 sccm during said selectively depositing.
18. The method of claim 1 wherein the selectively depositing is by chemical vapor deposition within a deposition chamber, gaseous WF6 and H2 comprising deposition precursors fed to the chamber during said selectively depositing.
19. The method of claim 18 wherein the fabricating is relative to a substrate, and comprising substrate temperature from about 250° C. to about 350° C., chamber pressure from about 1 mTorr to about 100 mTorr, WF6 flow rate to the chamber from about 10 sccm to about 1,000 sccm, and H2 flow rate to the chamber from about 5 sccm to about 50 sccm during said selectively depositing.
20. The method of claim 1 wherein the fabricating is relative to a substrate, and wherein the non-selective depositing is by chemical vapor deposition within a deposition chamber; gaseous WF6 and H2 comprising deposition precursors fed to the chamber during said non-selectively depositing; substrate temperature from about 300° C. to about 450° C., chamber pressure from about 20 Torr to about 250 Torr, WF6 flow rate to the chamber from about 100 sccm to about 500 sccm, and H2 flow rate to the chamber from about 1,000 sccm to about 30,000 sccm during said non-selectively depositing.
21. A method of fabricating integrated circuitry, comprising:
forming a first conductive line having an elevationally outermost surface comprising copper;
providing exposed non-conductive material laterally of the first conductive line;
depositing first elemental tungsten directly against the copper-comprising surface along at least a majority of longitudinal length of the first conductive line, the first tungsten being deposited selectively to the first conductive line relative to the exposed non-conductive material;
forming dielectric material elevationally over and directly against the first tungsten and forming a via through the dielectric material to the first tungsten;
forming a conductive material directly against the first tungsten after forming the via;
non-selectively depositing second elemental tungsten to within the via directly against the conductive material; and
forming a second conductive line elevationally outward of and electrically coupled to the second tungsten that is within the via.
22. The method of claim 21 wherein the conductive material is formed by chemical vapor deposition of at least one of TiN and WN.
23. The method of claim 22 wherein the conductive material consists essentially of at least one of TiN and WN.
24. The method of claim 21 wherein the conductive material is formed by physical vapor deposition of elemental tungsten.
25. The method of claim 24 wherein the conductive material consists essentially of said physical vapor deposited elemental tungsten.
26. A method of fabricating integrated circuitry, comprising:
forming a first conductive line having a planar elevationally outermost surface at least a majority of which comprises elemental copper;
providing non-conductive material laterally of the first conductive line, the non-conductive material having a planar elevationally outermost surface that is coplanar with the planar outermost surface of the first conductive line;
depositing first elemental tungsten directly against the copper-comprising surface along at least a majority of longitudinal length of the first conductive line, the first tungsten being deposited selectively to the first conductive line relative to the coplanar outermost surface of the non-conductive material;
forming dielectric material elevationally over and directly against the first tungsten and the non-conductive material;
forming a via through the dielectric material to the first tungsten;
forming a conductive material liner within the via over sidewalls of the via, within the via directly against the first tungsten, and elevationally over the dielectric material;
non-selectively depositing second elemental tungsten to within the via directly against the conductive material liner and elevationally over that portion of the conductive material liner that is elevationally over the dielectric material; and
forming a second conductive line elevationally outward of and electrically coupled to the second tungsten that is within the via.
27. The method of claim 26 wherein forming the second conductive line comprises:
removing the second tungsten and the conductive material liner back at least to expose the dielectric material; and
depositing conductive metal material directly against the second tungsten and the liner after said removing.
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US14/992,280 US9754879B2 (en) | 2013-03-01 | 2016-01-11 | Integrated circuitry |
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US13/782,213 US20140248767A1 (en) | 2013-03-01 | 2013-03-01 | Methods Of Fabricating Integrated Circuitry |
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