JP4531115B2 - 基材上にバリア兼シード層が形成された電子部材 - Google Patents
基材上にバリア兼シード層が形成された電子部材 Download PDFInfo
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- JP4531115B2 JP4531115B2 JP2009523097A JP2009523097A JP4531115B2 JP 4531115 B2 JP4531115 B2 JP 4531115B2 JP 2009523097 A JP2009523097 A JP 2009523097A JP 2009523097 A JP2009523097 A JP 2009523097A JP 4531115 B2 JP4531115 B2 JP 4531115B2
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- thin film
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- 230000004888 barrier function Effects 0.000 title claims description 28
- 239000000758 substrate Substances 0.000 title claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 57
- 229910052802 copper Inorganic materials 0.000 claims description 57
- 239000010949 copper Substances 0.000 claims description 57
- 229910045601 alloy Inorganic materials 0.000 claims description 40
- 239000000956 alloy Substances 0.000 claims description 40
- 239000010409 thin film Substances 0.000 claims description 34
- 238000007747 plating Methods 0.000 claims description 32
- 239000010408 film Substances 0.000 claims description 24
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 20
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 19
- 229910052707 ruthenium Inorganic materials 0.000 claims description 19
- 229910000510 noble metal Inorganic materials 0.000 claims description 18
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 18
- 229910052721 tungsten Inorganic materials 0.000 claims description 18
- 239000010937 tungsten Substances 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 13
- 229910052703 rhodium Inorganic materials 0.000 claims description 5
- 239000010948 rhodium Substances 0.000 claims description 5
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 5
- 229910052741 iridium Inorganic materials 0.000 claims description 4
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 44
- 238000000034 method Methods 0.000 description 10
- 239000002585 base Substances 0.000 description 7
- 238000009713 electroplating Methods 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 6
- 150000002739 metals Chemical class 0.000 description 6
- 238000000151 deposition Methods 0.000 description 5
- 238000004544 sputter deposition Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 125000004429 atom Chemical group 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 4
- 238000007772 electroless plating Methods 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- -1 3 -Sulfopropyl Chemical group 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 229910001080 W alloy Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 229910000365 copper sulfate Inorganic materials 0.000 description 2
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002648 laminated material Substances 0.000 description 2
- 125000004433 nitrogen atom Chemical group N* 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- VZCCTDLWCKUBGD-UHFFFAOYSA-N 8-[[4-(dimethylamino)phenyl]diazenyl]-10-phenylphenazin-10-ium-2-amine;chloride Chemical compound [Cl-].C1=CC(N(C)C)=CC=C1N=NC1=CC=C(N=C2C(C=C(N)C=C2)=[N+]2C=3C=CC=CC=3)C2=C1 VZCCTDLWCKUBGD-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 1
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical compound [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- SRRKNRDXURUMPP-UHFFFAOYSA-N sodium disulfide Chemical compound [Na+].[Na+].[S-][S-] SRRKNRDXURUMPP-UHFFFAOYSA-N 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010301 surface-oxidation reaction 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
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/18—Metallic material, boron or silicon on other inorganic substrates
- C23C14/185—Metallic material, boron or silicon on other inorganic substrates by cathodic sputtering
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/12—Semiconductors
- C25D7/123—Semiconductors first coated with a seed layer or a conductive layer
-
- 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
-
- 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
- H01L21/76871—Layers specifically deposited to enhance or enable the nucleation of further layers, i.e. seed layers
- H01L21/76873—Layers specifically deposited to enhance or enable the nucleation of further layers, i.e. seed layers for electroplating
-
- 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
- H01L21/2855—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
-
- 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
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- Condensed Matter Physics & Semiconductors (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Electrochemistry (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
- Electrodes Of Semiconductors (AREA)
Description
従来、半導体ウェハーのような鏡面上に無電解銅めっきを行った場合、析出しためっき膜に十分な密着性を得るのは困難であった。また、めっきの反応性が低く、基板全面に均一なめっきを行うことも困難であった。従来は、例えば、窒化タンタルなどのバリアメタル層上に無電解めっき法で銅シード層を形成する場合、めっきを均一に形成することが難しく密着力が十分でないという問題があった。
こうした銅シード層の成膜に先立つ二つの層形成の煩雑さを解消するため、本発明者らはバリア能と触媒能とを兼ね備えた特定の合金薄膜からなる単一層を形成し、さらに無電解めっき時に置換めっきおよび還元めっきを併用することにより、その上に形成する銅シード層の膜厚を薄く均一に形成できることを見出し、すでに出願した(特許文献2、特許文献3)。
また、上記特許文献4記載の積層材料においても、バリア層を積層構造とすることが必要である。
本発明は、前記方法を更に合理化し、より簡易な方法によりULSI微細銅配線を形成する技術を提供することを目的とするものである。
(1)基材上に、ULSI微細銅配線のバリア兼シード層として使用するタングステンとルテニウム、ロジウム、イリジウムから選ばれる1種または2種以上の貴金属との合金薄膜が形成された電子部材であって、該合金薄膜がタングステンを70原子%以上、貴金属を9原子%以上30原子%以下とする組成である電子部材。
(2)前記合金薄膜が、更に比抵抗値が20μΩ・cm以下である金属を5原子%未満含む前記(1)記載の電子部材。
(3)前記合金薄膜をバリア兼シード層として電気銅めっき膜を成膜し、ULSI微細銅配線を形成した前記(1)〜(2)のいずれか一項に記載の電子部材。
(4)前記基材が半導体ウェハーである前記(1)〜(3)のいずれか一項に記載の電子部材。
からなる。
(1)基材上に、ULSI微細銅配線のバリア兼シード層として使用するタングステンと貴金属との合金薄膜が形成された電子部材であって、該合金薄膜がタングステンを60原子%以上、貴金属を9原子%以上40原子%以下とする組成である電子部材。
(2)前記合金薄膜が、更に比抵抗値が20μΩ・cm以下である金属を5原子%未満含む前記(1)記載の電子部材。
(3)前記貴金属が、ルテニウム、ロジウム、イリジウムから選ばれる1種または2種以上の金属である前記(1)または(2)記載の電子部材。
(4)前記合金薄膜をバリア兼シード層として電気銅めっき膜を成膜し、ULSI微細銅配線を形成した前記(1)〜(3)のいずれか一項に記載の電子部材。
(5)前記基材が半導体ウェハーである前記(1)〜(4)のいずれか一項に記載の電子部材。
からなる。
発明の効果
タングステンは銅に対するバリア機能を有し、比抵抗値が5.65μΩ・cmと低めであるが、大気中で表面が酸化されやすい。そのため、薄膜とした場合は表面が酸化されて抵抗が高くなり、電気めっき用のシード層としては抵抗が高すぎて、均一な電気銅めっきができず、使用することができない。貴金属との合金とすることにより、タングステン表面の耐酸化性が向上し、バリア性の向上、抵抗減となり、直接電気銅めっきを行うことができるようになる。
タングステン以外のバリア性を有する金属(タンタル、チタン等)は、表面酸化度合いが大きいか、または酸化膜が不働態化しているため抵抗が高く、電気めっき用シード層としての使用に適さない。
比抵抗値が20μΩ・cm以下である金属としては、例えば、アルミニウム(比抵抗値2.655μΩ・cm)、マグネシウム(比抵抗値4.45μΩ・cm)、スズ(比抵抗値11.0μΩ・cm)、インジウム(比抵抗値8.37μΩ・cm)、モリブデン(比抵抗値5.2μΩ・cm)、ニオブ(比抵抗値12.5μΩ・cm)、亜鉛(比抵抗値5.92μΩ・cm)、ニッケル(比抵抗値6.84μΩ・cm)、コバルト(比抵抗値6.24μΩ・cm)、クロム(比抵抗値12.9μΩ・cm)等が挙げられる。
前記合金薄膜は、合金膜組成制御が容易なスパッタリングで形成することが好ましい。タングステンと貴金属を含むスパッタリング合金ターゲットを用い、基材上にスパッタ成膜することにより、タングステンと貴金属との合金薄膜を形成することができる。
配線部は銅又は銅を主成分とする合金であることが好ましく、銅がより好ましい。電気銅めっき液は、一般にダマシン銅配線埋め込み用に使用されている組成であればよく、特に限定されないが、例えば主成分として硫酸銅及び硫酸、微量成分として塩素、ポリエチレングリコール、二硫化ビス(3−スルホプロピル)二ナトリウム、ヤヌスグリーンなどを含んだ液を用いることができる。また、電気銅めっきを行う際の、温度、pH、電流密度等の条件についても、通常の銅配線用電気銅めっきと同様の条件で行うことができる。
実施例1
Si基板上にSiO2を形成し、その上に貴金属(ルテニウム)とタングステンからなるスパッタリング合金ターゲットを用いて表1に示す組成の膜厚10nmの合金薄膜を作製し、その合金膜をバリア兼シード層として電気めっきにより銅配線を形成した。スパッタ成膜はアルゴン圧0.8Pa、50Wの出力でプラズマを発生させ、15分間のプレスパッタ後、実施した。電気めっき液の組成は、硫酸銅0.25mol/L、硫酸1.8mol/L、塩酸1.4mmol/L、微量添加剤(二硫化ビス(3−スルホプロピル)二ナトリウム、ポリエチレングリコール、ヤヌスグリーン)で、めっき条件は浴温25℃、電流密度0.2A/dm2で30秒間実施した。400℃×30分の真空アニール処理後のバリア性をAESデプスプロファイル測定により確認した。バリア性の判定は、銅のタングステン合金膜中への拡散現象の有無により判定した。電気銅めっきの可否は、外観上光沢銅めっき膜が全面に均一に析出しているものは可、無光沢の粗いめっき膜が見られるものを析出不均一、膜が未析出のものを不可とした。結果を表1に示す。
実施例1における合金薄膜の組成を表1記載のように変えた以外は実施例1と同様にして銅配線を形成し、評価した。結果を表1に示す。
Claims (4)
- 基材上に、ULSI微細銅配線のバリア兼シード層として使用するタングステンとルテニウム、ロジウム、イリジウムから選ばれる1種または2種以上の貴金属との合金薄膜が形成された電子部材であって、該合金薄膜がタングステンを70原子%以上、前記貴金属を9原子%以上、30原子%以下とする組成である電子部材。
- 前記合金薄膜が、更に比抵抗値が20μΩ・cm以下である金属を5原子%未満含む請求の範囲第1項記載の電子部材。
- 前記合金薄膜をバリア兼シード層として電気銅めっき膜を成膜し、ULSI微細銅配線を形成した請求の範囲第1項〜第2項のいずれか一項に記載の電子部材。
- 前記基材が半導体ウェハーである請求の範囲第1項〜第3項のいずれか一項に記載の電子部材。
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