JP2015177119A - Cu配線の製造方法 - Google Patents
Cu配線の製造方法 Download PDFInfo
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- JP2015177119A JP2015177119A JP2014053934A JP2014053934A JP2015177119A JP 2015177119 A JP2015177119 A JP 2015177119A JP 2014053934 A JP2014053934 A JP 2014053934A JP 2014053934 A JP2014053934 A JP 2014053934A JP 2015177119 A JP2015177119 A JP 2015177119A
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- 238000000034 method Methods 0.000 title claims abstract description 66
- 229910016978 MnOx Inorganic materials 0.000 claims abstract description 71
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 claims abstract description 53
- 229910052751 metal Inorganic materials 0.000 claims abstract description 39
- 239000002184 metal Substances 0.000 claims abstract description 39
- 238000011282 treatment Methods 0.000 claims abstract description 32
- 230000004888 barrier function Effects 0.000 claims abstract description 20
- 239000011229 interlayer Substances 0.000 claims abstract description 20
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims description 54
- 230000015572 biosynthetic process Effects 0.000 claims description 39
- 238000004519 manufacturing process Methods 0.000 claims description 29
- 238000005240 physical vapour deposition Methods 0.000 claims description 26
- 238000000151 deposition Methods 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 10
- 239000012528 membrane Substances 0.000 claims description 5
- 238000002294 plasma sputter deposition Methods 0.000 claims description 5
- 229910052715 tantalum Inorganic materials 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- 238000011049 filling Methods 0.000 abstract description 4
- 239000010408 film Substances 0.000 description 270
- 238000012545 processing Methods 0.000 description 126
- 239000010949 copper Substances 0.000 description 116
- 235000012431 wafers Nutrition 0.000 description 91
- 238000012546 transfer Methods 0.000 description 83
- 239000007789 gas Substances 0.000 description 62
- 239000011572 manganese Substances 0.000 description 29
- 230000007246 mechanism Effects 0.000 description 28
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 14
- 238000005229 chemical vapour deposition Methods 0.000 description 14
- 239000001257 hydrogen Substances 0.000 description 13
- 229910052739 hydrogen Inorganic materials 0.000 description 13
- 230000006911 nucleation Effects 0.000 description 10
- 238000010899 nucleation Methods 0.000 description 10
- 239000004065 semiconductor Substances 0.000 description 10
- 238000000231 atomic layer deposition Methods 0.000 description 9
- -1 diketone manganese compounds Chemical class 0.000 description 9
- 150000002697 manganese compounds Chemical class 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 230000008021 deposition Effects 0.000 description 8
- 150000002500 ions Chemical class 0.000 description 8
- 238000011068 loading method Methods 0.000 description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 7
- 238000009616 inductively coupled plasma Methods 0.000 description 7
- 229910052748 manganese Inorganic materials 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 238000000137 annealing Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000011261 inert gas Substances 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 238000009832 plasma treatment Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005530 etching Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 238000010926 purge Methods 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- DEIHRWXJCZMTHF-UHFFFAOYSA-N [Mn].[CH]1C=CC=C1 Chemical compound [Mn].[CH]1C=CC=C1 DEIHRWXJCZMTHF-UHFFFAOYSA-N 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000007872 degassing Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000013507 mapping Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 229910052707 ruthenium Inorganic materials 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- NQZFAUXPNWSLBI-UHFFFAOYSA-N carbon monoxide;ruthenium Chemical group [Ru].[Ru].[Ru].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-] NQZFAUXPNWSLBI-UHFFFAOYSA-N 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- HDWDVUXQIOWBEP-UHFFFAOYSA-N C(C)C1(C=CC=C1)[Ru] Chemical compound C(C)C1(C=CC=C1)[Ru] HDWDVUXQIOWBEP-UHFFFAOYSA-N 0.000 description 1
- LGJJVJDDNWYROS-UHFFFAOYSA-N C1(C=CC=C1)[Ru]C=C(C=C(C)C)C Chemical compound C1(C=CC=C1)[Ru]C=C(C=C(C)C)C LGJJVJDDNWYROS-UHFFFAOYSA-N 0.000 description 1
- XOSBQSGUNCVAIL-UHFFFAOYSA-N CC(=C[Ru]C1(C=CC=C1)CC)C=C(C)C Chemical compound CC(=C[Ru]C1(C=CC=C1)CC)C=C(C)C XOSBQSGUNCVAIL-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical compound [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000003421 catalytic decomposition reaction Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 125000000058 cyclopentadienyl group Chemical group C1(=CC=CC1)* 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- ASTZLJPZXLHCSM-UHFFFAOYSA-N dioxido(oxo)silane;manganese(2+) Chemical compound [Mn+2].[O-][Si]([O-])=O ASTZLJPZXLHCSM-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- ZSWFCLXCOIISFI-UHFFFAOYSA-N endo-cyclopentadiene Natural products C1C=CC=C1 ZSWFCLXCOIISFI-UHFFFAOYSA-N 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- QKOHYQVZNLEAJH-UHFFFAOYSA-N oxomethylidenemanganese Chemical class O=C=[Mn] QKOHYQVZNLEAJH-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
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- H—ELECTRICITY
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- 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
- H01L21/2855—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 physical means, e.g. sputtering, evaporation
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- 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
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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- 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
- H01L21/28568—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 the conductive layers comprising transition metals
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- 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
- H01L21/76801—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 dielectrics, e.g. smoothing
- H01L21/76822—Modification of the material of dielectric layers, e.g. grading, after-treatment to improve the stability of the layers, to increase their density etc.
- H01L21/76826—Modification of the material of dielectric layers, e.g. grading, after-treatment to improve the stability of the layers, to increase their density etc. by contacting the layer with gases, liquids or plasmas
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- 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
- H01L21/76801—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 dielectrics, e.g. smoothing
- H01L21/76829—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 dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
- H01L21/76831—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 dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers in via holes or trenches, e.g. non-conductive sidewall liners
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- 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
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- 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
- H01L21/76871—Layers specifically deposited to enhance or enable the nucleation of further layers, i.e. seed layers
- H01L21/76876—Layers specifically deposited to enhance or enable the nucleation of further layers, i.e. seed layers for deposition from the gas phase, e.g. CVD
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- 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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- 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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- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Plasma & Fusion (AREA)
- Crystallography & Structural Chemistry (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
- Chemical Vapour Deposition (AREA)
- Electrodes Of Semiconductors (AREA)
- Physical Vapour Deposition (AREA)
Abstract
Description
最初に、本発明のCu配線の製造方法の一実施形態について図1のフローチャートおよび図2の工程断面図を参照して説明する。
なお、酸化マンガンはMnO、Mn3O4、Mn2O3、MnO2等複数の形態をとり得るため、これら全てをMnOxで表す。
MnOx膜204はCVDまたは原子層堆積法(ALD)により成膜する。MnOx膜204は成膜の際の熱、またはその後のプロセス(水素ラジカル処理やアニール処理等)の熱により、少なくとも層間絶縁膜202との境界部分で層間絶縁膜202中のSiおよびO成分と反応してマンガンシリケート(MnxSiOy(MnSiO3またはMn2SiO4)が形成され、自己整合バリア膜となる。
水素ラジカル処理は、MnOx膜204を還元して表面をMnに改質する処理であり、これにより、Ru膜を成膜しやすくなる。すなわち、水素ラジカル処理により、Ru膜成膜時のインキュベーション時間を短くすることができ、成膜レートを高くすることができるとともに、Ruの膜質を良好にすること(低抵抗)およびRu膜を高ステップカバレッジで薄く均一に成膜することができる。
この処理は、ステップ4の水素ラジカル処理を補う処理である。すなわち、水素ラジカル処理によりRu膜が形成されやすくはなるものの、トレンチやホールが微細になると、十分な効果が得られない場合も生じるが、このステップ5の処理を行うことにより、微細なトレンチやホールにも良好なRu膜を高ステップカバレッジで薄く均一に成膜することができる。このため、その後のCuの埋め込みを良好に行うことができる。
RuはCuに対する濡れ性が高いため、Cuの下地にRu膜を形成することにより、次のPVDによるCu膜形成の際に、良好なCuの移動性を確保することができ、トレンチやホールの間口を塞ぐオーバーハングを生じ難くすることができる。しかし、MnOx膜の上にRu膜を成膜しても、Ruの核形成密度が低いため、良好な膜質のRu膜を高ステップカバレッジで形成することは困難である。そこで、上述したように、MnOx膜204の表面に、水素ラジカル処理に加えて、Ruよりも活性な金属を存在させる処理を行うことにより、その金属がRuの核形成サイトとなって良好な膜質のRu膜を高ステップカバレッジで成膜することができ、Ru膜を薄く均一に形成することができる。これにより、微細なトレンチやビア(ホール)内にもボイドを発生させずに確実にCuを埋め込むことができる。Ru膜206は、埋め込むCuの体積を大きくして配線を低抵抗にする観点から、1〜5nmと薄く形成することが好ましいが、本実施形態では、微細なトレンチやビア(ホール)内にもこのような薄い膜を均一に形成することができる。
(1)ALD MnOx膜成膜
圧力:1,33Pa
ウエハ温度:130℃
ALDサイクル:21サイクル
(2)水素ラジカル処理
RF供給電力:2kW
水素濃度:10%
圧力:32Pa
温度:300℃
(3)iPVD Ta膜成膜
IPCコイルへの供給電力:5.25kW
ターゲットへの直流電力:2.3kW
載置台に印加するRFバイアス(13.56MHz):200W
圧力:87Pa
(4)CVD Ru膜成膜
圧力:66.5Pa
温度:200℃
(5)iPVD Cu成膜(Cu埋め込み)
IPCコイルへの供給電力:4kW
ターゲットへの直流電力:11kW
載置台に印加するRFバイアス(13.56MHz):400W
圧力:12Pa
温度:300℃
次に、本発明の実施形態に係るCu配線の製造方法の実施に好適な成膜システムについて説明する。図8は本発明の実施形態に係るCu配線の製造方法の実施に好適なシステムの概略構成を示すブロック図、図9は図8の第1成膜処理部の一例を示す平面図、図10は図8の第2成膜処理部を示す平面図、図11は図8の制御部を示すブロック図である。
次に、上記成膜システム100に用いられるCu膜成膜装置42a,42bおよびTa形成装置32a,32bに好適に用いることができるPVD装置について説明する。図12は、PVD装置の一例を示す断面図である。
次に、上記成膜システムに用いられるMnOx膜装置14a,14bおよびRu膜成膜装置34a,34bに好適に用いることができるCVD装置について説明する。図13は、CVD装置の一例を示す断面図であり、熱CVDによりMnOx膜またはRu膜を成膜するものである。なお、このCVD装置は、ガス供給系を交互供給可能なものとすることによりALD装置としても対応可能である。
次に、水素ラジカル処理装置の一例について説明する。
図14は、水素ラジカル処理装置の一例を示す断面図であり、リモートプラズマ処理により処理容器内に水素ラジカルを生成するものを例にとって説明する。
以上、本発明の実施形態について説明したが、本発明は上記実施形態に限定されることなく種々変形可能である。例えば、成膜システムとしては、図8のような第1成膜処理部と第2成膜処理部とが分かれているものに限らず、これらが一体となっているものでもよい。また、成膜処理部が3つ以上でもよく、また同一の処理部での処理が別の組み合わせであってもよい。
14a,14b;MnOx膜成膜装置
32a,32b;Ta形成装置
34a,34b;Ru膜成膜装置
35a,35b;水素ラジカル処理装置
42a,42b;Cu膜成膜装置
100;成膜システム
101;第1成膜処理部
102;第2成膜処理部
103;CMP処理部
104;制御部
201;下部構造
202;層間絶縁膜
203;トレンチ
204;MnOx膜
205;Ruより活性な金属
206;Ru膜
207;Cu膜
208;Cu配線
W;半導体ウエハ(被処理基板)
Claims (7)
- 表面に所定パターンの凹部が形成された層間絶縁膜を有する基板に対し、前記凹部を埋めるCu配線を製造するCu配線の製造方法であって、
少なくとも前記凹部の表面に、前記層間絶縁膜との反応で自己整合バリア膜となるMnOx膜を形成する工程と、
前記MnOx膜の表面に水素ラジカル処理を施す工程と、
前記水素ラジカル処理後の前記MnOx膜の表面にRuよりも活性な金属を存在させる工程と、
その後、Ruよりも活性な金属を存在させた表面にRu膜を形成する工程と、
その後、Ru膜の上にCu膜をPVDにより形成して前記凹部内に前記Cu膜を埋め込む工程とを有することを特徴とするCu配線の製造方法。 - 前記Ruよりも活性な金属を存在させる工程は、PVDによりその金属を堆積させることにより行われることを特徴とする請求項1に記載のCu配線の製造方法。
- 前記Ruよりも活性な金属を存在させる工程は、その金属を前記凹部内の壁部に不連続に形成することにより行われることを特徴とする請求項1または請求項2に記載のCu配線の製造方法。
- 前記Ruよりも活性な金属を存在させる工程は、金属としてTa、Co、W、Tiからなる群から選択されたものを用いることを特徴とする請求項1から請求項3のいずれか1項に記載のCu配線の製造方法。
- 前記Ru膜は、CVDにより形成されることを特徴とする請求項1から請求項4のいずれか1項に記載のCu配線の製造方法。
- 前記Cu膜の形成は、プラズマスパッタ処理により行われることを特徴とする請求項1から請求項5のいずれか1項に記載のCu配線の製造方法。
- コンピュータ上で動作し、Cu配線製造システムを制御するためのプログラムが記憶された記憶媒体であって、前記プログラムは、実行時に、請求項1から請求項6のいずれかのCu配線の製造方法が行われるように、コンピュータに前記Cu配線製造システムを制御させることを特徴とする記憶媒体。
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JP2019504356A (ja) * | 2016-01-21 | 2019-02-14 | エーエスエムエル ネザーランズ ビー.ブイ. | Euv容器及びeuvコレクタのターゲット材料デブリクリーニングのためのシステム、方法、及び装置 |
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