JP5683022B2 - タングステンの粗度減少及び反射率改善の方法、集積回路の製造方法、並びにタングステンフィルムを半導体基板上に堆積する装置 - Google Patents
タングステンの粗度減少及び反射率改善の方法、集積回路の製造方法、並びにタングステンフィルムを半導体基板上に堆積する装置 Download PDFInfo
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title claims description 200
- 239000010937 tungsten Substances 0.000 title claims description 200
- 229910052721 tungsten Inorganic materials 0.000 title claims description 200
- 238000000034 method Methods 0.000 title claims description 159
- 238000000151 deposition Methods 0.000 title claims description 96
- 239000000758 substrate Substances 0.000 title claims description 44
- 239000004065 semiconductor Substances 0.000 title claims description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 238000002310 reflectometry Methods 0.000 title description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 118
- 230000008569 process Effects 0.000 claims description 99
- 230000008021 deposition Effects 0.000 claims description 63
- 230000006911 nucleation Effects 0.000 claims description 62
- 238000010899 nucleation Methods 0.000 claims description 62
- 229910052757 nitrogen Inorganic materials 0.000 claims description 56
- 230000009467 reduction Effects 0.000 claims description 45
- 239000002243 precursor Substances 0.000 claims description 39
- 239000003638 chemical reducing agent Substances 0.000 claims description 32
- 239000007789 gas Substances 0.000 claims description 26
- 235000003642 hunger Nutrition 0.000 claims 1
- 230000037351 starvation Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 description 92
- 238000005229 chemical vapour deposition Methods 0.000 description 54
- 239000010408 film Substances 0.000 description 49
- NXHILIPIEUBEPD-UHFFFAOYSA-H tungsten hexafluoride Chemical compound F[W](F)(F)(F)(F)F NXHILIPIEUBEPD-UHFFFAOYSA-H 0.000 description 14
- 238000012545 processing Methods 0.000 description 11
- 235000012431 wafers Nutrition 0.000 description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 239000001257 hydrogen Substances 0.000 description 10
- 229910052739 hydrogen Inorganic materials 0.000 description 10
- 230000032258 transport Effects 0.000 description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
- 230000007423 decrease Effects 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000005755 formation reaction Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 238000005137 deposition process Methods 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 229910001873 dinitrogen Inorganic materials 0.000 description 5
- 239000012159 carrier gas Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000011946 reduction process Methods 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 238000000231 atomic layer deposition Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- UORVGPXVDQYIDP-UHFFFAOYSA-N borane Chemical compound B UORVGPXVDQYIDP-UHFFFAOYSA-N 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical group C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- -1 tungsten nitride Chemical class 0.000 description 2
- 229910003091 WCl6 Inorganic materials 0.000 description 1
- 238000004630 atomic force microscopy Methods 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 229910000085 borane Inorganic materials 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000000427 thin-film deposition Methods 0.000 description 1
- KPGXUAIFQMJJFB-UHFFFAOYSA-H tungsten hexachloride Chemical compound Cl[W](Cl)(Cl)(Cl)(Cl)Cl KPGXUAIFQMJJFB-UHFFFAOYSA-H 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
-
- 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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/02—Pretreatment of the material to be coated
- C23C16/0272—Deposition of sub-layers, e.g. to promote the adhesion of the main coating
- C23C16/0281—Deposition of sub-layers, e.g. to promote the adhesion of the main coating of metallic sub-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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/06—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of metallic material
- C23C16/08—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of metallic material from metal halides
- C23C16/14—Deposition of only one other metal element
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/0262—Reduction or decomposition of gaseous compounds, e.g. CVD
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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
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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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- 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
- H01L21/76876—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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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Vapour Deposition (AREA)
- Electrodes Of Semiconductors (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
Description
[関連出願との関係]
本発明は2008年8月29日に提出された米国特許出願12/202126号を基に優先権を主張するものであり、その全体をすべての目的において此処に合同させるものとする。
以下の記述に於いてはタングステンフィルム形成に関する本発明の完全理解のために多くの実施形態が開示される。ここに示され論じられる特定の方法や装置の変更、実施、変化などは本発明の範囲の中に於いて当業者には明白であろう。
本発明の方法は種々の販売元から入手可能な種々の種類の堆積装置で実施可能である。適当な装置の例にはNovellus Concept−1 Altus,Concept 2 Altus,Concept−2 ALTUS−S,Concept 3 Altus堆積装置、及び他の市場で入手可能なCVDツールが含まれる。場合によって、工程は複数の堆積部署において逐次的に実施されてもよい。例えば米国特許6143082号が参照可能であり、これはすべての目的において本願に参照して合同されるものとする。或る実施形態において、パルス式核形成工程は単一の堆積チェンバ内に位置する2、5或はそれ以上の数の堆積部署の中の一つである第一部署で実施される。従って、還元ガス及びタングステン含有ガスは第一部署に於いてサブストレイトの表面に局地的雰囲気を生成する個別のガス供給システムを使用して交互にサブストレイトの表面に導入される。
本発明は多くの応用のための薄手低抵抗タングステン層の堆積に使用可能である。好適な応用例として、メモリチップやマイクロプロセサのような集積回路での相互接続子がある。相互接続子は単一金属化層の上の電流線であり、一般的に長くて薄く平坦な構成である。相互接続子の基本的応用はメモリチップのビット線である。これらの形成にはまずタングステン層がブランケット式に堆積され(上記の工程による)、次いでパタニング工程で電流通過の位置を定義し、タングステン線外部の領域からタングステンを除去する。
本発明は若干の実施例に関して記述されたものであるが、本発明の範囲内には多くの変更、置換、代行、均等のものが含まれる。本発明の方法及び装置を実施する多くの代行的様相の存在することは銘記されるべきことである。従って、此処に添付される請求項は本発明の真の意図と範囲にあるかような変更、置換、代行、均等によるものを含むものとする。
なお、本願明細書に記載の実施形態によれば、以下の構成もまた開示される。
[項目1]
タングステンフィルムを半導体サブストレイトの上に形成する方法であって、
該半導体サブストレイトの上にタングステン核形成層を堆積する工程と、
該タングステン核形成層の上にタングステンバルク層をCVD工程で堆積する工程と
を備え、
前記CVD工程において該半導体サブストレイトは、該タングステンバルク層の堆積の間に、パルス間に遅延期間が存在する窒素の複数パルスに露出される方法。
[項目2]
前記タングステン核形成層を堆積する工程が1サイクル以上を有し
前記1サイクルは、タングステンを含む前駆体が窒素の存在しない状態で還元剤によって還元される少なくとも一つのCVD工程及びタングステンを含む前駆体が窒素の存在下で還元剤によって還元される少なくとも一つのCVD工程を含む、項目1に記載の方法。
[項目3]
少なくとも2サイクルを含む、項目2に記載の方法。
[項目4]
堆積されたタングステンバルク層の反射率が空のシリコンウエファの反射率より20%大きい、項目1に記載の方法。
[項目5]
堆積されたタングステンバルク層の抵抗率が約15マイクロオーム−cm以下である、項目1に記載の方法。
[項目6]
堆積されたタングステンバルク層の抵抗率が約13マイクロオーム−cm以下である、項目1に記載の方法。
[項目7]
堆積されたタングステンバルク層が、タングステンを含む前駆体の窒素の存在下での還元で堆積される第一の厚さと、タングステンを含む前駆体の窒素の存在しない状態での還元で堆積される第二の厚さとから成り、全体の厚さは第一の厚さと第二の厚さの和であり、第一の厚さの全体の厚さに対する割合が約0.2と0.9の間にある、項目1に記載の方法。
[項目8]
第一の厚さの全体の厚さに対する割合が約0.4と0.8の間にある、項目7に記載の方法。
[項目9]
第一の厚さの全体の厚さに対する割合が約0.5と0.8の間にある、項目7に記載の方法。
[項目10]
第一の厚さの全体の厚さに対する割合が約0.6と0.8の間にある、項目7に記載の方法。
[項目11]
前記タングステン核形成層を堆積する工程は、還元剤のパルスとタングステンを含む前駆体のパルスとをサブストレイトの上に交互に行うことを含み、PNL工程によって核形成層を堆積する、項目1に記載の方法。
[項目12]
前記タングステンバルク層を堆積する工程が、タングステンを含む前駆体が窒素の存在しない状態で還元剤によって還元されてタングステンが堆積される少なくとも一つのCVD工程と、タングステンを含む前駆体が窒素の存在下還元剤によって還元されてタングステンが堆積される少なくとも一つのCVD工程とを有し、窒素存在下のCVD工程の間の温度が窒素が存在しない状態のCVD工程の間の温度より高い、項目1に記載の方法。
[項目13]
前記タングステンバルク層を堆積する工程が、WF 6 をH 2 で還元することを含む、項目1に記載の方法。
[項目14]
前記タングステンを含む前駆体がWF 6 であり、前記還元剤がH 2 である、項目2に記載の方法。
[項目15]
タングステンを含む前駆体を堆積する工程が、複数の逐次的CVD工程を有し、還元剤が窒素の存在下でタングステンを含む前駆体を還元し、前記複数の逐次的CVD工程の間には少なくとも1秒の遅延期間がある、項目1に記載の方法。
[項目16]
タングステンフィルムを半導体サブストレイトの上に形成する方法であって、
該半導体サブストレイトの上にタングステン核形成層を堆積する工程と、
該タングステン核形成層の上にタングステンバルク層をCVD工程においてタングステンを含む前駆体を還元することで堆積する工程と
を備え、
前記CVD工程においては該半導体サブストレイトが該タングステンバルク層の堆積の間窒素の複数パルスに露出され、窒素パルス間にはaが0.2と0.9の間にあるように遅延期間が含められ、aとは窒素の存在下で堆積されたタングステンバルク層のタングステンの厚さをタングステンバルク層の全体の厚さで割った比のことである、方法。
[項目17]
aが0.5と0.8の間にある、項目16に記載の方法。
[項目18]
前記タングステンバルク層が、WF 6 のH 2 による還元で堆積される、項目16に記載の方法。
[項目19]
タングステンフィルムを半導体サブストレイトの上に堆積する装置であって、
サブストレイト支持具及びサブストレイトをガスのパルスに露出させるように構成された一個以上のガス入口を含む堆積チャンバーと、
該堆積チャンバー内の工程を制御する制御器と
を備え、
該制御器はタングステンを含む前駆体及び還元剤をチャンバー内へ流入させ、窒素をパルス間に遅延期間を持たせてチャンバーの中へ脈動させる、装置。
Claims (20)
- タングステンフィルムを半導体基板上に形成する方法であって、
該半導体基板上にタングステン核形成層を堆積する工程と、
該タングステン核形成層上にタングステンバルク層をCVD工程で堆積する工程と
を備え、
前記CVD工程において該半導体基板は、該タングステンバルク層の堆積の間に、パルス間に遅延期間が存在する窒素の複数パルスに露出され、
前記タングステンバルク層の前記CVDでの堆積は、前記タングステンバルク層の前記CVDでの堆積の間、パルス式核形成層(PNL)工程によりタングステンを堆積させることなく行われる方法。 - 前記タングステン核形成層を堆積する工程が1サイクル以上を有し
前記1サイクルは、タングステンを含む前駆体が窒素の存在しない状態で還元剤によって還元される少なくとも一つのCVD工程及びタングステンを含む前駆体が窒素の存在下で還元剤によって還元される少なくとも一つのCVD工程を含む、請求項1に記載の方法。 - 前記タングステン核形成層を堆積する工程は、少なくとも2サイクルを含む、請求項2に記載の方法。
- 堆積されたタングステンバルク層の反射率がシリコンウエファの反射率より20%大きい、請求項1から3の何れか1項に記載の方法。
- 堆積されたタングステンバルク層の抵抗率が15マイクロオーム−cm以下である、請求項1から4の何れか1項に記載の方法。
- 堆積されたタングステンバルク層の抵抗率が13マイクロオーム−cm以下である、請求項1から5の何れか1項に記載の方法。
- 堆積されたタングステンバルク層が、タングステンを含む前駆体の窒素の存在下での還元で堆積される第一の厚さと、タングステンを含む前駆体の窒素の存在しない状態での還元で堆積される第二の厚さとから成り、全体の厚さは第一の厚さと第二の厚さの和であり、第一の厚さの全体の厚さに対する割合が0.2と0.9の間にある、請求項1から6の何れか1項に記載の方法。
- 第一の厚さの全体の厚さに対する割合が0.4と0.8の間にある、請求項7に記載の方法。
- 第一の厚さの全体の厚さに対する割合が0.5と0.8の間にある、請求項7または8に記載の方法。
- 第一の厚さの全体の厚さに対する割合が0.6と0.8の間にある、請求項7から9の何れか1項に記載の方法。
- 前記タングステン核形成層を堆積する工程は、還元剤のパルスとタングステンを含む前駆体のパルスとを基板上に交互に行うことを含み、PNL工程によって核形成層を堆積する、請求項1から10の何れか1項に記載の方法。
- 前記タングステンバルク層を堆積する工程が、タングステンを含む前駆体が窒素の存在しない状態で還元剤によって還元されてタングステンが堆積される少なくとも一つのCVD工程と、タングステンを含む前駆体が窒素の存在下還元剤によって還元されてタングステンが堆積される少なくとも一つのCVD工程とを有し、窒素存在下のCVD工程の間の温度が窒素が存在しない状態のCVD工程の間の温度より高い、請求項1から11の何れか1項に記載の方法。
- 前記タングステンバルク層を堆積する工程が、WF6をH2で還元することを含む、請求項1から12の何れか1項に記載の方法。
- 前記タングステンを含む前駆体がWF6であり、前記還元剤がH2である、請求項2に記載の方法。
- 前記タングステンバルク層を堆積する工程が、複数の逐次的CVD工程を有し、還元剤が窒素の存在下でタングステンを含む前駆体を還元し、前記複数の逐次的CVD工程の間には少なくとも1秒の遅延期間がある、請求項1から14の何れか1項に記載の方法。
- タングステンフィルムを半導体基板上に形成する方法であって、
該半導体基板上にタングステン核形成層を堆積する工程と、
該タングステン核形成層上にタングステンバルク層をCVD工程においてタングステンを含む前駆体を還元することで堆積する工程と
を備え、
前記CVD工程においては該半導体基板が該タングステンバルク層の堆積の間窒素の複数パルスに露出され、窒素パルス間にはαが0.2と0.9の間にあるように遅延期間が含められ、αとは窒素の存在下で堆積されたタングステンバルク層のタングステンの厚さをタングステンバルク層の全体の厚さで割った比のことであり、
前記タングステンバルク層の前記CVDでの堆積は、前記タングステンバルク層の前記CVDでの堆積の間、パルス式核形成層(PNL)工程によりタングステンを堆積させることなく行われる、方法。 - αが0.5と0.8の間にある、請求項16に記載の方法。
- 前記タングステンバルク層が、WF6のH2による還元で堆積される、請求項16または17に記載の方法。
- 半導体基板を準備する段階と
請求項1から18の何れか1項に記載の方法によりタングステンフィルムを前記半導体基板上に形成する段階と
を備える集積回路の製造方法。 - タングステンフィルムを半導体基板上に堆積する装置であって、
基板支持具及び基板をガスのパルスに露出させるように構成された一個以上のガス入口を含む堆積チャンバーと、
該堆積チャンバー内の工程を制御する制御器と
を備え、
該制御器はタングステンを含む前駆体及び還元剤をチャンバー内へ流入させ、窒素をパルス間に遅延期間を持たせてチャンバーの中へ脈動させ、
前記制御器は、前記半導体基板上にタングステン核生成層を堆積させ、
前記制御器は、前記タングステン核形成層上にタングステンバルク層をCVD工程で堆積させ、
前記CVD工程において前記半導体基板は、前記タングステンバルク層の堆積の間に、パルス間に遅延期間が存在する窒素の複数パルスに露出され、(出願時請求項1)
前記タングステンバルク層の前記CVDでの堆積は、前記タングステンバルク層の前記CVDでの堆積の間、パルス式核形成層(PNL)工程によりタングステンを堆積させることなく行われる、装置。
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US8551885B2 (en) | 2013-10-08 |
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WO2010025357A2 (en) | 2010-03-04 |
CN102084462A (zh) | 2011-06-01 |
KR101363648B1 (ko) | 2014-02-14 |
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US20100055904A1 (en) | 2010-03-04 |
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