TW506017B - Manufacturing method for semiconductor device, and the semiconductor device - Google Patents
Manufacturing method for semiconductor device, and the semiconductor device Download PDFInfo
- Publication number
- TW506017B TW506017B TW089120665A TW89120665A TW506017B TW 506017 B TW506017 B TW 506017B TW 089120665 A TW089120665 A TW 089120665A TW 89120665 A TW89120665 A TW 89120665A TW 506017 B TW506017 B TW 506017B
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- Prior art keywords
- film
- insulating film
- wiring
- polishing
- grinding
- Prior art date
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 title claims description 22
- 238000005498 polishing Methods 0.000 claims abstract description 97
- 238000000034 method Methods 0.000 claims abstract description 42
- 239000002002 slurry Substances 0.000 claims abstract description 35
- 238000009413 insulation Methods 0.000 claims abstract description 5
- 239000010408 film Substances 0.000 claims description 282
- 239000013039 cover film Substances 0.000 claims description 54
- 230000004888 barrier function Effects 0.000 claims description 33
- 239000000758 substrate Substances 0.000 claims description 22
- 229910052718 tin Inorganic materials 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 19
- 238000005530 etching Methods 0.000 claims description 18
- 229910052721 tungsten Inorganic materials 0.000 claims description 10
- 239000000956 alloy Substances 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 150000004767 nitrides Chemical class 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 229910052715 tantalum Inorganic materials 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 5
- 229910052720 vanadium Inorganic materials 0.000 claims description 5
- 238000000151 deposition Methods 0.000 claims description 4
- 229910052707 ruthenium Inorganic materials 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 150000001247 metal acetylides Chemical class 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims 2
- 229910052750 molybdenum Inorganic materials 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- 239000010949 copper Substances 0.000 description 71
- 239000010410 layer Substances 0.000 description 32
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 17
- 229910052751 metal Inorganic materials 0.000 description 17
- 239000002184 metal Substances 0.000 description 17
- 238000004544 sputter deposition Methods 0.000 description 14
- 238000009792 diffusion process Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 238000001312 dry etching Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000001259 photo etching Methods 0.000 description 3
- 238000000206 photolithography Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- -1 r 丨 E Chemical compound 0.000 description 2
- 239000002344 surface layer 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
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XPDWGBQVDMORPB-UHFFFAOYSA-N Fluoroform Chemical compound FC(F)F XPDWGBQVDMORPB-UHFFFAOYSA-N 0.000 description 1
- 241000270666 Testudines Species 0.000 description 1
- 241000981595 Zoysia japonica Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005275 alloying Methods 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
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- MVFCKEFYUDZOCX-UHFFFAOYSA-N iron(2+);dinitrate Chemical compound [Fe+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MVFCKEFYUDZOCX-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- GJAWHXHKYYXBSV-UHFFFAOYSA-N quinolinic acid Chemical compound OC(=O)C1=CC=CN=C1C(O)=O GJAWHXHKYYXBSV-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000006188 syrup Substances 0.000 description 1
- 235000020357 syrup Nutrition 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
Classifications
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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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
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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
- H01L21/02—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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
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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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/32115—Planarisation
- H01L21/3212—Planarisation by chemical mechanical polishing [CMP]
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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
- H01L21/76801—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
- H01L21/76819—Smoothing of the dielectric
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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
- H01L21/76801—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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- 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
- H01L21/76801—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
- H01L21/76834—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 formation of thin insulating films on the sidewalls or on top of conductors
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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
- H01L21/7684—Smoothing; Planarisation
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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
- H01L23/5222—Capacitive arrangements or effects of, or between wiring 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
- H01L23/53228—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
- H01L23/5329—Insulating materials
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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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
Description
506017 案號 89120665 _η 修正 五、發明說明(1) [發明背景] 本發明係關於金屬鑲 嵌構造時之C Μ Ρ製程者 之構造及形成阻擋膜構 配線間電容、確保耐氧 性、抑制配線電阻增大 於近年之半導體裝置 鑲嵌配線(包含插頭(ρ 1 構造中,為了防止埋入 刻停止件(e t c h i n g s t o 的,必須於配線上面設 此罩膜重點在須為薄膜 頭性能)降低。具體上 一理由在於縱橫比高的 上有困難之故。 以下以金屬鑲嵌配線 成配線用溝,接著於配 以與應形成之罩膜的厚 (recess etching),於 料堆積於半導體基板全 CMP(chemical mechani 僅殘留於配線用溝内。 惟,依此方法,配線 (d i s h i n g,即中央凹陷 如設配線寬5 // m之情況 篏(darnasence)構造及开》成金屬鑲 ,特別是關於C u配線上面之阻擂膜 造時之CMP製程者;其係關於降低 化性、確保與C u擴散對應之阻擋 者。 中,依微細化其他觀點而使用金屬 ug))構造。於多層之金屬鑲篏配線 於溝内金屬之擴散或氧化、係為# pper)使用、或降低接觸電阻等目 置與配線材料相異之罩(c a ρ)膜。 。其理由之一係使配線性能(或插 ,係因要使RC延遲為最小之故。另 配線(或插頭)即厚膜之形成在製程 為例說明。習知技術係於絕緣膜形 線用溝内形成埋入配線。其後,僅 度相當的厚度,施以挖凹蝕刻 配線上面形成凹處。接著將罩膜材 面上。再將場(field)上的罩膜以 cal polishing)除去,藉以將罩膜 如此於配線用溝内埋入形成罩膜。 上的罩膜會產生CMP造成之碟化 狀),對罩膜厚度之控制性低。例 ,即使欲形成膜厚40 nm之罩膜,
Q:\66\66788-9[〇5l0.ptc 第5頁 506017 案號 89120665 年 月 曰 修正 五、發明說明(2) 實際上係如圖1所示,罩膜膜厚係1 5 nm而為期望值的一半 以下。在配線寬比5 /z m大的區域,所形成之罩膜的膜厚更 薄。即,罩膜膜厚之配線寬依存性變大,製程控制性低, 在寬的配線寬中無法獲得期望的膜厚。 又習知技術在設罩膜膜厚為一定之情況,將配線之挖凹 量加大,形成所期望之厚度之罩膜。惟,此方法中,將場 (field)上的罩膜以CMP除去後之半導體基板表面的起伏 大,又於挖凹部侧壁殘存罩膜,而引發以下問題。例如金 屬鑲嵌配線與其上所形成之貫穿孔(v i a h ο 1 e )之間發生對 合偏差,因此造成貫穿孔内所形成之接觸材料之埋入不良 或接觸電阻上升。又,在罩膜具導電性之情況,挖凹部側 壁上的殘存罩膜作為電容之電極面積變大之故,配線間電 容變大,因此使配線之R C延遲增大。 如此,習知用以形成金屬鑲嵌構造之CMP製程及其構造 中,有上述第1習知例之罩膜碟化及第2習知例之罩膜殘留 於挖凹部側壁之問題,妨礙其特性提升。本發明之目的係 藉由形成可避免上述問題點之罩膜,以提供RC特性優異之 半導體裝置。 又,以往與Cu配線之上表面所形成之Cu擴散相對的阻擋 膜,係提案使用例如T a N膜或T i N膜。為了實現此構造,係 將絕緣層之溝内部所形成之Cu配線的上部部分去除,使其 比絕緣膜上面後退,接著於半導體基板全面形成阻擋膜, 其後在絕緣膜之場(f i e 1 d)上之阻擋膜依化學牲機械研磨 (CMP)處理予以去除。惟,Cu膜上部之阻擋膜易受Cu膜表 面之狀態影響,C u膜表面之微粒或龜裂所造成之凹凸部或
O:\66\66788-9i05l0.ptc 第6頁 506017 _案號89120665_年月日__ 五、發明說明(3) 絕緣膜與配線之段差部之阻擋性降低。又,依阻擋層形成 時之CMP步驟時之碟化或邊緣(edge)部之損傷,含於所形 成之阻擋層形成缺陷。為了即使形成缺陷亦確保其充分之 阻擋性。必須要將阻擋層之膜厚加大。惟,C Μ P之研磨速 度在晶圓面内不均。因此所形成之阻擋膜厚,除了確保高 阻擋性之膜厚外,尚必須取得用以補償此不均之差額 (m a r g i η )。如此做成之阻擔膜厚的增大,使得配線用溝内 之配線厚度減少之故,使實效配線電阻(配線溝部之體積 所對應之配線電阻)增大。雖為了降低配線電阻間考慮要 將溝加深,但此情況因縱橫比變高,不僅溝加工或C u埋入 之各步驟的負擔變大,因配線部相互之對向面面積增大, 亦使配線間電容增加。 故,本發明係提供可避免上述問題點之阻擋膜,其目的 在不會增加配線間電容,而可抑制Cu向層間絕緣膜擴散。 [發明要點] 本發明(申請專利範圍第1項)之半導體裝置之製造方 法,其特徵在於:具有:於半導體基板上形成絕緣膜之步 驟;於此絕緣膜形成溝之步驟;於此溝内埋入形成配線材 料之步驟;將此埋入形成之配線材料予以挖凹蝕刻之步 驟;於此挖凹蝕刻之配線材料上堆積罩膜之步驟;第1階 段研磨,其係以(前述罩膜之研磨速度)/(前述絕緣膜之研 磨速度)=R 1之選擇比進行研磨者;及第2階段研磨,其係 以(前述罩膜之研磨速度)/(前述絕緣膜之研磨速度)= R2之 選擇比進行研磨者;前述第1階段研磨與第2階段研磨係使 用R1 >R2之研磨漿,進行各研磨。
G:\66\66788-910510.ptc 第7頁 506017 _ 案號 89120665 修正 曰 五、發明說明(4) ^ 依本發明,可在於金屬 狀態下,形成罩膜。 幾嵌配線上極力抑制碟化發生之 又’將配線材料挖凹蝕 之堆積膜厚大為佳。依挖 ^驟之挖凹量,以比前述罩膜 段研磨中,可極力抑制^四量 > 罩膜之堆積膜厚,於第1階 又,本發明係在絕緣祺2之碟化產生。 特徵在於具有··在Cu配線部形成之埋入Cu配線構造者’其 A 1合金屬予以層積之構造^。之上表面,經由中間層將A 1或 如此,依經由C u配線上邱+山 層積之構造,即使Cu洩漏,佐^層將A1 *A1合金屬予以 散。又,因A1之比電阻低…伴, (margin)而將A1層做成較厚之情=二=保差額 層=造成之實效電阻之上升抑制於最小、限度配線上部阻擋 前述中間層係含有由Ti 、Zr、v、W、Ta?Nb、
Co、Rn已内所選擇出之至少一種元素者。 、Cr、Sn、 該等材料係防止A 1在Cu配線中擴散使配線 [圖式說明] 阻上升者。 圖1為罩膜之加工後膜厚之配線寬度依存性 發明之比較)。 ㈢知例與本 圖2 A〜D為本發明之實施例1之半導體裝置 之構造剖面圖。 I造步驟中 圖3 A〜B為繼續圖2之製造步驟之構造剖面圖。 圖4為本發明之實施例1之半導體裝置之製造 之蝕刻速度與選擇性之特性圖。 衣以 法所引用 圖5 A〜C為本發明之實施例2之丰導體裝置制 心衣造步驟中
O:\66\66788-910510.ptc 第8頁 506017 _案號89120665_年月日_魅_ 五、發明說明(5) 之構造剖面圖。 圖6 A〜C為繼續圖5之製造步驟之構造剖面圖。 圖7 A〜B為繼續圖6之製造步驟之構造剖面圖。 圖8 A〜D為本發明之實施例3之半導體裝置之製造步驟之 構造剖面圖。 圖9 A〜B為繼續圖8之製造步驟之構造剖面圖。 圖10A〜C為本發明之第4實施形態之半導體裝置之製造步 驟中之構造剖面圖。 圖1 1 A〜C為本發明之第4實施形態之後續之半導體裝置之 製造步驟中之構造剖面圖。 圖1 2 A〜C為本發明之第5實施形態之半導體裝置之製造步 驟中之構造剖面圖。 圖1 3 A〜B為本發明之第5實施形態之後續之半導體裝置之 製造步驟中之構造剖面圖。 [發明之實施例] 以下參照圖式說明本發明之實施例。 本發明之第1實施例係於Cu金屬鑲嵌配線上面形成由TaN 所成之罩膜之方法。罩膜的目的在防止Cu配線擴散、防止 Cu配線氧化、在連接孔開孔時保護Cu配線、及降低Cu配線 之接觸電阻。 首先如圖2A所示,於半導體基板100上形成例如Si02絕 緣膜1 0 1。次之,依光蝕刻及蝕刻法,於絕緣膜1 0 1形成深 400 nm之配線用溝。次之,於半導體基體100全面上,依 濺鍍法堆積2 0 nm之T a N膜1 0 2,接著依丨賤鍍法堆積8 0 0 n m 之C u膜1 0 3,此處,T a N必須作為包圍C u之底面及側面之擴
Q:\66\66788-910510.ptc 第9頁 506017 ___案號 89120665_年月日__ 五、發明說明(6) 散防止層。 次之,如圖2 B所示,將C u膜1 0 3之不要的部分即場 (f i e 1 d)上以外之Cu膜1 03以CMP予以除去,僅於配線用溝 内即配線部殘留C u膜1 0 3。此C Μ P係使用包含過硫酸銨、喹 啉啶研磨漿,以PH 8、TR/TT(頂環(top ring)/轉台(turn table)之旋轉比):6 0 / 1 0 0、Pad:IC 1 0 0 0 (表層)/suba 4 0 0 (下層)之條件,進行1 2 0秒。此階段雖不除去τ a N膜1 0 2 間殘留於場(f i e 1 d)上,但在依T a N膜1 0 2之此階段之c Μ P或 Cu膜1 0 3之下一挖凹步驟,絕緣膜1 〇 1不受損傷之情況下, 將TaN膜102於此階段以CMP除去,在製程上亦無問題。 次之’如圖2 C所示’將配線部之C u膜1 0 3挖凹1 〇 〇 n m程 度之厚度。此挖凹可使用例如使用氯素系氣體之r丨E等乾 式蝕刻進行,或依使用作為蝕刻液之過硫酸胺與作為粒界 抑制之抑制劑之喹啉啶酸之混合液的濕式蝕刻進行。 次之,如圖2D所示,於半導體基體1〇〇全面上堆積20 nm 之TaN 膜104 。 於本實施例中,次之如圖3 A所示,以第1研磨階段先除 場(f i e 1 d )上之T a N膜1 0 4、T a N膜1 0 2,僅於配線用溝内即 配線部殘留TaN膜104、TaN膜102,作為Cu膜103上之罩 膜。接著如圖3 B所示,以第2研磨階段削去絕緣膜1 〇 1、
TaN膜102至TaN膜104之上表面為止。 圖3 A之第1研磨階段,為了避免因短路電路造成之良品 率降低,必須確實除去場(field)上之TaN膜102。因此希 望TaN之研磨速度較高。另一方面,為了極力抑制cu膜1〇3 上之TaN膜1 0 2的損傷,有必要盡力殘留絕緣膜1 〇 1,維持
O:\66\66788-9105l0.ptc 第10頁 506017 _案號 8912f)Rfi5_年月曰 ill_ 五、發明說明(7) 絕緣膜101與Cu膜103上之TaN膜102之段差。因此,希望絕 緣膜1 0 1之研磨速度較低。 即,第1研磨階段所用之研磨漿如圖4所示,希望係具有 對T a N膜1 0 1之研磨能力高、對絕緣膜1 〇 1之研磨能力低之 特性者。所期望之研磨漿係例如碎(s i 1 i c a )系研磨漿。此 貫施例之第1研磨階段係使用石夕系研磨漿,uPH2,tr/tt: 60/100、Pad:IC 1000/Suba 400 之條件,進行6〇 秒之研 磨。此處:¾•没(罩膜104之研磨速度)/(絕緣膜1Q1之研磨速 度)= R1,則可得R1>1之條件。 次之,圖3 B之第1研磨階段,為了消除絕緣膜1 〇 1對T a n 膜104之段差’希望絕緣膜ιοί之研磨速度較高。另一方 面,為了使Cu膜1 03上之罩膜即TaN膜1 04之損傷降為最小 限度,希望TaN膜104之研磨速度較低。 即,第2研磨階段所用之研磨漿如圖4所示,係絕緣膜 101之研磨能力高、TaN膜104之研磨力低、且不會引起粒 界#刻者。所期望之研磨漿係為例如添加丙二酸之驗性碎 系研磨漿。此實施例之第2研磨階段,係使用添加丙二酸 之鹼性矽系研磨漿、PH12、TTR/TT: 6 0 / 1 0 0、Pad: 1C 1 0 0 0 /Suba 40 0之條件,進行丨2〇秒之研磨。此處若設(罩 膜1 0 4之研磨速度)/ (絕緣膜丨之研磨速度)=R 2,則可得 R2<1之條件。又’挖凹部側壁之TaN膜丨〇2可依高負荷之機 械研磨予以削除。 依上述製程’可形成碟化最少之阻擋性高的TaN膜1〇4。 即,可將阻擋性高的TaN膜1〇4良好控制的形成所期望的厚 度。又,亦可除去挖凹部侧壁之TaN膜1〇2。又,於第2研
O:\66\66788-9105l0.ptc 第11頁 506017 __案號 89120665_年月日_Ifi___ 五、發明說明(8) 磨步驟中藉使用具上述特性之研磨漿,TaN膜1 02附近之絕 緣膜101表面離TaN膜102越遠;面水平越降低。即,於第2 研磨階段中,藉使用具上述特性之研磨漿,於絕緣膜1 〇 1 會發生碟化現象。 本發明之第2實施例表示在W(鎢)金屬鑲嵌配線上面形成 S i N所成之罩膜之方法。此構造體可使用於以Si N膜覆蓋閘 電極之構造等。罩膜之使用目的在作為對配線材料層之絕 緣性層之保護及對R I E之蝕刻阻止件。 首先如圖5A所示,於半導體基板200上形成例如Si 02之 絕緣膜2 0 1。次之,以光蝕刻及蝕刻法在絕緣膜2 0 1形成深 度4 0 0 nm之配線用溝。次之,於半導體基板2 0 0全面上以 LP(Low Pressure 低壓)一CVD(Chemical Vapor Deposition化學蒸鍍)法堆積20 nm之SiN膜2 0 2。 次之,如圖5 B所示,將絕緣膜2 0 1之場(f i e 1 d)上之S i N 膜2 0 2,依使用CHF3氣體之蝕刻RIE(Reactive Ion E t c h i ng )予以除去,僅於清内部之側壁殘留s i N膜2 0 2。 次之,如圖5C所示,以濺鍍法堆積1〇 nm/20 nm之Ti (下 層)/TiN膜(上層)之層積膜203作為W(鎢)之種(seed)層, 次之以CVD法堆積550 nm之W膜204。 次之、如圖6 A所示,將絕緣膜2 〇 1之場(f i e 1 d)上之W膜 2 0 4及Ti/TiN膜2 0 3以CMP除去。此CMP係使用例如含硝酸鐵 之铭系研磨漿,以PH 1. 5、TR/Ή : 6 0 / 1 0 0、Pad: 1C 1 0 0 0 /Suba 40 0之條件,進行12〇秒之研磨。 次之如圖6B所示’將w膜20 4及側壁部之Ti/TiN 2 0 3,依 使用氯素及氟素系氣體之乾式蝕刻予以挖凹蝕刻約丨〇 〇
O:\66\66788-910510.ptc 第12頁 506017 _案號89120665__年月日 修正_ 五、發明說明(9) n m ° 次之’如圖6 c所示,於半導體基板2 〇 〇全面依濺鍍法堆 積20 nm 之SiN 膜205 。 本實施例,次之如圖7 A所示,以第1研磨階段除去場 (field)上之SiN膜2 0 5,接著如圖7B所示,以第2研磨階段 削除絕緣膜201、Si N膜2 0 2、Si N膜2 0 5至Si N膜2 0 5之上面 部為止。 圖7 A之第1研磨階段所用之研磨漿係具有對S丨n之研磨能 力高、對絕緣膜之研磨能力低之特性者,所期望之研磨漿 係例如磷酸,矽系研磨漿。此實施例之第1研磨階段係使 用例如磷酸、矽系研磨漿,以ρ Η 1 . 5、T R / T T : 5 0 / 5 0、 Pad:IC 1000/Suba 400之條件,進行1 2 〇秒之研磨。此處 若(罩膜205之研磨速度)/(絕緣膜2〇1之研磨速度)=R1,則 可得R1>1之條件。 次之,圖7B之第2研磨階段中,為了消除絕緣膜2 〇 1對 SiN膜205之段差,希望絕緣膜2〇1之研磨速度高。另一方 面,為了使對W上之罩膜即s i N膜2 0 5之損害降到最小,希 望S i N膜2 0 5之研磨速唬極低。 即,第2階段研磨所用之研磨漿係絕緣膜之研磨能力 高、S i N之研磨能力低,且不引起粒界蝕刻者。所期望之 研磨漿係例如石夕系研磨漿。本實施例中使用石夕系研磨漿, 在PH 12 、TR/TT:50/50 、pad:IC iooo/suba 400 之條件, 進行1 2 0秒之研磨。此處若(罩膜2 〇 5之研磨速度)/(絕緣膜 201之研磨速度)= R2 ’則可得R2<1之條件。又,挖凹部側 壁之S i N膜2 0 2、2 0 5可依高負荷之機械研磨予以削除。
Q:\66\66788-910510.ptc 第13頁 506017 ___案號 89120665 _年月 日_修正___ 五、發明說明(10) 如上述,依進行複數階段之研磨,可形成碟化最少之 S i N罩膜2 0 5。即,可將S i N罩膜2 0 5控制於所期望之厚度, 又,亦可除去挖凹側壁之SiN膜205。又,於使用具有上述 選擇性之研磨漿之第2階段研磨中,因於側壁存在有s丨N膜 2 0 2之故,S i N膜2 0 2之端稍微成圓形突出。依此種構造, 在其後之製程中形成未圖示之絕緣膜,於其實施SAC(Self Align Contact)步驟之情況之RIE製程中,電漿集中至su 膜2 0 5之端部的情況被抑制,藉此可減輕元件的局部性損 害。 參照圖8 A - 9 B說明本發明之第3實施例。本發明之第3實 施例係於A 1 (鋁)金屬鑲嵌配線上面,形成由τ i N所成之罩 膜之方法。此實施例之罩膜之目的在抑制光蝕刻處理中A i 表面之反射。 首先如圖8A所示,於半導體基板3 0 0上,形成例如Si〇2 之絕緣膜3 0 1。次之,依光蝕刻及蝕刻法,於絕緣膜3 〇 }形 成深度400 nm之配線用溝。次之,於半導體基板3〇〇之全 面依濺鑛法堆積20 nm之NbN膜302,接著依濺鏟法堆積 800 nm之A1膜303。此處NbN膜302之功能在作為A1之襯塾 (liner)。 次之如圖8B所示,將A1膜303之不要的部分即場 上之A 1膜3 0 3以CMP除去,僅於配線開溝内即配線部殘留A j 膜3 0 3。此C Μ P係使用含喹啉咬酸之銘系研磨漿,以p jj 5、 TR/TT(頂環(top ring) / 轉台(turn table)之旋轉 比):6 0 / 1 0 0、Pad : IC 1 0 0 0 (表層)Suba 4 0 0 (下層)之條 件,進行1 2 0秒之研磨。於此階段雖不除去N b N膜3 0 2而殘
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O:\66\66788-910510.ptc 506017 _案號89120665_年月日_修正 _ 五、發明說明(11) 留於場(f i e 1 d )上,但在依N b N膜3 0 2之此階段之C Μ P或A 1膜 3 0 3之下一挖凹步驟,絕緣膜3 0 1未受損害之情況下,於此 階段以C Μ P除去N b N膜3 0 2亦處理上之問題。 次之如圖8C所示,將配線部之A 1膜3 0 3挖凹約1 00 nm。 此挖凹係使用氯素系氣體依R I E等之乾式蝕刻進行。 次之如圖8D所示,於半導體基板3〇〇全面上堆積20 nm之 TiN 膜304 。 次之如圖9 A所示,以第1研磨階段除去場(f i e丨d )之T i n 膜3 0 4、N b N膜3 0 2,僅於配線用溝内即配線部殘留τ i N膜 304,作為A1膜303上之罩膜。接著如圖9B所示,以第2研 磨階段削除絕緣膜30 Ι-NbN膜30 2至TiN膜3 0 4之上表面為 止0 圖9 A之第1研磨階段為了避免cu配線間之短路電路造成 良品率降低,必須確實除去場(f ield)上之TiN膜3 04、NbN 膜302。因此,希望TiN、NbN之研磨速度高。另一方面, 為了極力抑制A 1膜3 0 3上之TiN膜3 0 4之損害,必須盡力殘 留絕緣膜301,維持絕緣膜3〇1與上之TiN膜3〇4之 段差。因此,希望絕、緣膜3 〇1之研磨速度低。 即’第1研磨階段所用之研磨漿希望係具有對τ丨N膜 3 0 4、NM膜3 0 2之研磨能力高,對絕緣膜3〇1之研磨能力低 之特性者。 所期望之研磨漿係例如矽系研磨漿。此實施例之第i研 磨階段使用矽系研磨漿,以PH 2、TR/TT: 6〇/1〇〇、pad: κ 1000/Suba400之條件,進行6Q秒之研磨。此處若(罩膜I" 之研磨速度)/(絕緣膜1(H之研磨速度)= R1,則可得以^之
(J:\66\66788-910510.ptc 第15頁 506017 _ 案號 89120665_ 年月曰 in:_ 五、發明說明(12) 條件。 次之,圖9 B之第2研磨階段為了消除絕緣膜3 〇 1對T i N膜 3〇4之段差,希望絕緣膜301之研磨速度高。另一方面為了 使對A 1膜3 0 3上之罩膜即TiN膜3 04之損害降為最低,希望 極力使TiN膜304之研磨速度為低。 即,第2研磨階段所用之研磨漿係絕緣膜3 〇 1之研磨能力 高、T i N膜3 0 4之研磨能力低,且不引起粒界蝕刻者。所期 望之研磨聚係例如添加丙二酸之驗性石夕系研磨漿本實施例 之第2研磨階段係使用例如添加丙二酸之驗性石夕素研磨 漿,以PH12、TR/TT:6 0 / 1 0 0、Pad:IC 1 0 0 0 /Suba 40 0 之條 件,進行1 2 0秒之研磨。此處若(T i Ν·罩膜3 0 4之研磨速 度)/ (絕緣膜3 0 1之研磨速度)=R 2,則可得R 2 < 1之條件。 又,挖凹部側壁之N b Ν膜3 0 2係於挖凹部側壁施加高負荷之 機械研磨予以削除。 依上述製程,可形成碟化最少之阻擋性高的TiN膜304。 即可將阻擋性高之T i N膜3 0 4良好的控制於所期望的厚度予 以形成。又,亦可除去挖凹部側壁之NbN膜3 0 2。又,於第 2研磨階段中依使用上述之研磨漿,NbN膜3 0 2附近之絕緣 膜301表面係離NbN膜302越遠,面水平越降低。即,於第2 研磨階段中依使用具上述特性之研磨漿,於絕緣膜3 〇 1上 發生碟化現象。 依上係對本發明所作之詳細說明,但本發明並不限定於 上述第1 - 3實施例,而係在不脫出本發明主旨之範圍内, 研磨漿、P a d等之研磨條件、層後構造、材料或膜厚等處 理條件等可有各種變形、應用。
O:\66\66788-9105l0.ptc 第16頁 506017
案號 89120665 五、發明說明(13) 例如前述罩膜雖係以TaN、SiN、TiN為例說明,但依自 防止配線之擴散、防止氧化、防止反射、防止姓刻(餘刻 停止件,etching stopper)、降低接觸電阻、提升可靠"产 寻所選出之目的,可自Ti 、Ta、Nb、W、Cr、V、Pt、|^及 該等之氮化物、氧化物、硼化物、合金、混合物為主成分 者中予以選擇,又,依自防止蝕刻(etching st〇pper)、刀 防止氧化、提升可靠度等所選出之目的,可自^及其氧化 物、氮化物、氟素摻雜之氧化膜為主成分者中予以^ 以下參照圖式說明本發明之第4實施例。 、 本發明之第4實施例係關於在cu金屬鑲嵌配線上面形 由Al/TaN所成之配線上部阻擋層者。配線上部阻 ς 的在防止對Cu之擴散及氧化。 田曰 首先如圖10A所示,於半導體基板4 〇〇上堆積由埶氧化 100 ηπι·ρ-3^膜3〇 nm、CVD氧化膜4〇(3錢所成之絕緣膜、 4 0 1。次之,依光蝕刻及蝕刻法kCVD氧化膜,形成深度 4 0 0 urn之配線圖案溝。此配線圖案係為L/s : 〇. 4/〇. 4 長k 5 mm之配線,於兩端連接電極墊(pad)。 次之’依賤鍍法堆積2〇 nm之TaN膜4 0 2,依濺鍍法堆積 200 nm之Cu膜。此處了 a n膜係作為包圍c u膜之底面及側面 之擴散防止層之必要之物。 次之依電錢法將Cu膜予以埋入,施以CMP處理形成Cu配 線4 0 3 ' 一人之’如圖1 0 B所示,於Cu配線4 0 3之表面以酸之蝕刻形 成70 nm之挖凹部4〇4。 次之如圖1〇C所示,堆積50 nm之TaN膜4 0 5,如圖1 1 A所
506017 ----室號 89120fifi5 _年月日__ 五、發明說明(14) 示’依CMP處理於cu配線4 0 3上部選擇性殘存TaN膜40 5。此 情況中’一部分之TaN膜係依碟化間變薄至約30 nm。 次之如圖1 1 B所示,依濺鍍法全面堆積5 0 n m之A1膜4 0 6 後’如圖1 1C所示,依CMP處理除去絕緣膜上之A1膜4 0 6。 A 1膜之形成方法並不限於濺鍍法而亦可用選擇性c VD法 等。又’因段差小之故,雖可用無加熱濺鍍予以充分埋 入’但為獲得A1之更佳的涵蓋(coverage),在Cu不擴散之 範圍内,希望能加熱基板。 次之參照圖式說明本發明之第5實施例。 本發明之第5實施例係於C u金屬鑲欲配線上面形成由 A 1 / T i N所成之配線上部阻擋層之方法。與第4實施例之步 驟順序相異之處在於:將配線上部阻擋層之CMP處理,在中 間層T i N及A 1之層積後以2階段進行。配線上部阻擋層之目 的在防止對Cu膜之擴散及氧化。 首先如圖1 2 A所示,以與第4實施例相同之方法,獲得在 絕緣膜501内埋入形成之TaN膜5 0 2、Cu配線5 0 3所成之埋入 配線構造。 次之如圖1 2 B所示,、將C u配線5 0 3表面以酸蝕刻形成 50 nm之挖凹部504。 次之如圖12C所示,依濺鑛法全面堆積20 nm之TiN膜 505 ’如圖13A所示’依濺鐘法全面堆積50 nm之A1膜506。 次之如圖13B所示,依2階段CMP,除去剩餘之A1膜5 0 6及 TiN膜5 0 5,僅於Cu配線5 0 3上部殘存A1膜5 0 6 /TiN膜5 0 5所 成之阻擋膜。 依上述第5實施例,具有不會於T i N膜5 0 5發生碟化現象
O:\66\66788-9105l0.ptc 第18頁 506017 __案號89120665_年月日__ 五、發明說明(15) 之優點’及依2階段C Μ P之連續步驟除去剩餘的A 1膜5 0 6及 T i N膜5 0 5之故,有步驟數減少之優點。 以下表示2個與上述第4、5實施例所示2例對應之習知技 術之比較例。 (比較例1 ) 比較例1係於Cu金屬鑲嵌配線形成5 0 nm之挖凹部,形成 由T a N所成之配線上部阻擋層者。 於半導體基板上堆積由100 nm之熱氧化膜、30 nm之 p-SiN膜、及400 nm之CVD氧化膜所成之絕緣膜。次之依光 蝕刻及蝕刻法於CVD氧化膜形成深度4 0 0 nm之配線圖案 溝。 次之依濺鍍法堆積20 nm之TaN膜,依濺鍍法堆積2 0 0 nm 之Cu膜。 次之依電鍍法埋入C u膜,施以C Μ P處理形成C u配線後, 將C u配線表面依酸餘刻形成5 〇 n m之挖凹部。 次之於晶圓全面堆積50 nm之TaN膜,依CMP處理僅於Cu 配線上部殘存TaN膜。此情況中,一部分之TaN膜依碟化而 被薄膜化成約30 nm。 (比較例2 ) 比較例2係於C u金屬鑲喪配線形成1 0 0 n m之挖凹部,形 成由T a N所成之配線上部阻擋層者。 於半導體基板上堆積由100 nm之熱氧化膜、30 nm之 P-SiN膜、及4 0 0 nm之CVD氧化膜所成之絕緣膜。次之,依 光蝕刻及蝕刻法,於CVD氧化膜形成深度4 0 0 nm之配線圖 案溝。
O:\66\66788-91G510.ptc 第19頁 506017 案號 891206& 年 月 曰 修正 五、發明說明(16) 次之,依滅鑛法堆積2 〇 n m之T a N膜’依濺鍍法堆積 2〇〇 nm 之Cu 膜 ° 次之,依電鍍法埋入Cu膜,施以CMP處理形成Cu配線 後,將C u配線表面依酸餘刻形成1 0 〇 n m之挖凹部。 次之,於晶圓全面堆積1 〇〇 nm之TaN膜,依CMP處理僅於 Cu配線上部殘存TaN膜。此情況中,一部分之TaN膜依碟化 而被薄膜化,但最薄處仍殘存有7 0 n m。 對以上第4、5實施例及比較例1、2之方法所作成之試 料,進行配線電阻測定、阻擋性測驗。阻擋性測驗係對形 成阻擋膜後之各晶圓,將氧化矽膜以C V D法堆積1 # m,進 行4 5 0 °C、4 0小時之熱處理後,將絕緣膜予以溶解,測定 内之C u濃度。以於表面完全無堆積之S i晶圓體對照組,在 C u濃度增加之情況’判疋為C u通過阻擔層而擴散。測定結 果示於表1。 實施形態1 實施形態2 比較例1 比較例2 實效配線電阻(//· Ω· cm) 2.1 2.1 2.1 2.8 阻擋性測驗 OK OK NG OK 综合判定 〇 〇 X Δ 如比較例1,在挖凹50 nm、TaN堆積時膜厚50 n[n之情 況,配線電阻良好,但因碟化使TaN膜變薄之故,阻撞θ性 劣化,C u擴散於絕緣膜中。最薄處所測得之膜厚為3 〇
506017 -___ 案號89120665_年月曰 〜 五、發明說明(17) n m ’儘管比側面或底面之T a N膜厚,但阻擋性却降低,此 乃因C u膜表面之微粒或表面龜裂導致凹凸部存在、或絕緣 月美與C u配線之段差部中未獲充分之涵蓋之故。 如比較例2,設定挖凹部1〇〇 nm、TaN堆積時膜厚 1 00 nm,使Cu配線上之TaN膜較厚,藉此雖改善了阻擔 性,但因溝内C u量減少,使配線電阻增大,又,在為了確 保C u膜厚度而將溝做深1 /z m之情況下,因縱橫比較高,於 晶圓之一部分未充分埋入。 相對於此,第4、第5實施例表現出良好的配線電阻。第 4實施例中雖因碟化使T a N膜變薄,又第5實施例中雖僅將 T i N做成2 0 n m之膜厚,但C u卻未擴散至絕緣膜中。此乃因 该荨膜只要防止A1擴散至Cu中即已足夠,在Cu擴散之情況 會在A1中被合金化而捕獲,此外,於A1表面存在氧化膜具 有作為擴散防止膜之功能。藉此可實現配線電阻低之高功 能的配線。 關於配線上部阻擋層之CMP處理,於第4實施例中,在每 次層積構成挖凹罩(recess cap)之2種材料時,逐次施以 C Μ P處理,又於第5實施例中,在層積2種材料後,施以2階 段CMP處理,但在第4、第5實施例互相取代步驟順序亦 可。例如可於第4實施例層積2種材料後,施以2階段C ΜΡ處 理。 於上述第4、第5實施例,可在不脫出本發明之主旨之範 圍下,將材料或膜厚之條件作各種變形應用。例如,中間 層只要係防止A 1擴散至Cu配線使配線電阻上升者即可,可 為包含自 Ti、Zr、V、W、Ta、Nb、Cr、Sn、Co、Ru 中所選
O:\66\66788-9i0510.ptc 第21頁 506017 _案號89120665_年月日__ 五、發明說明(18) 出之至中一元素者,或含有該等之氮化物、氧化物、硼化 物、碳化物者。又,配線層雖係以使用C u為例說明,但亦 可使用A g。 依上述第1 - 3實施例,可在極力抑制金屬鑲嵌配線上之 碟化發生之狀態下形成罩膜。 又,依第4-5實施例,藉經由中間層所形成之A 1或A 1合 金與銅進行合金化可捕獲Cu,又存在於A1或A1合金表面之 氧化膜,具有作為擴散防止膜之功能。如此,可實現配線 電阻低之高性能配線。A 1或A 1合金之膜厚若在2 0 nm以上 則具有良好的阻擂性之故,加設C Μ P之差額(m a r g i η),使 加工後膜厚成為20 nm程度之堆積膜厚即可,但為獲更高 之阻擋性,做成2 0 n ra以上亦可。又,A 1或A 1合金之電阻 低之故,即使膜厚做成較厚,配線電阻亦幾乎不會上升。
Q:\66\66788-9l0510.ptc 第22頁 506017 案號89120665_年月日 修正 圖式簡單說明 符號 說明 100. 2 0 0 . 3 0 0、 400 半導体基 板 10 1、 201、 30 1 S i 02絕緣 膜 102. 104、 4 0 2、 405 、 502 TaN膜 103 Cu膜 2 0 2 , 205 SiN膜 204 W膜 302 NbN膜 3 0 3 . 40 6、 506 A1膜 3 0 4、 505 TiN膜 401、 501 絕緣膜 4 0 3、 503 Cu配線 504 挖凹部
O:\66\66788-9i0510.ptc 第23頁
Claims (1)
- 506017 _案號89120665_年月曰 修正_ 六、申請專利範圍 1 . 一種半導體裝置之製造方法,其特徵在於: 具有:於半導體基板上形成絕緣膜之步驟; 於此絕緣膜形成溝之步驟; 於此溝内埋入形成配線材料之步驟; 將此埋入形成之配線材料予以挖凹蝕刻之步驟; 於此挖凹蝕刻之配線材料上堆積罩膜之步驟; 第1階段研磨,其係以(前述罩膜之研磨速度)/(前 述絕緣膜之研磨速度)=R1之選擇比進行研磨者;及第2階 段研磨,其係以(前述罩膜之研磨速度)/(前述絕緣膜之研 磨速度)= R2之選擇比進行研磨者; 前述第1階段研磨與第2階段研磨係使用R 1 > R 2之研磨 漿,進行各研磨;除此之外,前述第1階段研磨之R1係在1 以上,且前述第2階段研磨之R 2係在1以下者。 2.如申請專利範圍第1項之半導體裝置之製造方法,其 中將前述配線材料予以挖凹蝕刻步驟之挖凹量,係比前述 罩膜之堆積膜厚大者。 3 .如申請專利範圍第1或2項之半導體裝置之製造方法, 其中前述罩膜係選自以Ti 、Ta、Nb、W、Cr、V、Pt、Ru及 該等之氮化物、氧化物、硼化物、合金、混合物為主成分 者。 4 ·如申請專利範圍第1或2項之半導體裝置之製造方法, 其中前述罩膜係選自以S i之氧化物、氮化物、摻雜氟 素之氧化膜為主成分者。 5 .如申請專利範圍第1或2項之半導體裝置之製造方法,O:\66\66788-910510.ptc 第24頁 506017 _案號89120665_年月日__ 六、申請專利範圍 其中前述配線材料係選自以A 1、Cu、W、Ru、Ag、Mo、S 1 及該等之氮化物、氧化物、硼化物、合金、混合物為主成 分者。 6. —種半導體裝置,其特徵在於: 具有:絕緣膜,其係形成於半導體基板上者; 溝,其係形成於此絕緣膜者; 第1導電膜,其係形成於前述溝之内壁者; 第2導電膜,其係經由前述第1導電膜,埋入形成 於前述溝之内部者;及 第3導電膜,其係以覆蓋住前述第2導電膜之上部 的方式形成者; 前述第1導電膜附近之前述絕緣膜表面,係隨著離前述 第1導電膜漸遠而面水平降低。 7. —種半導體裝置,其特徵在於: 具有:第1絕緣膜,其係形成於半導體基板上者; 溝,其係形成於此第1絕緣膜者; 第2絕緣膜,其係形成於前述溝之内壁者; 導電膜,其係隔著前述第2絕緣膜形成於前述溝之 内部者;及 第3絕緣膜,其係以覆蓋住前述導電膜之上部的方 式形成者; 前述第2絕緣膜附近之前述第1絕緣膜表面,係隨 著離前述第2絕緣膜漸遠而面水準降低。 8. —種半導體裝置,其特徵在於:O:\66\66788-9i0510.ptc 第25頁 506017 _案號89120665_年月曰 修正_ . 六、申請專利範圍 具有:絕緣膜,其係形成於半導體基板上者, · 溝,其係形成於該絕緣膜者; C u配線部,其係形成於前述溝之内部者;及 阻擔層,其係具有中間層與A 1層或中間層與A 1合 金層之層積構造,形成於前述Cu配線部上面之前述溝内 者。 9.如申請專利範圍第8項之半導體裝置,其中前述中間 層係含有由 Ti 、Zr、V、W、Ta、Nb、Cr、Sn、Co、Ru 之内 所選出之至少1種元素者。 1 0 .如申請專利範圍第8項之半導體裝置,其中前述中間 層係含有由 Ti、Zr、V、W、Ta、Nb、Cr、Sn、Co、Ru 之内肇 所選出之至少1種元素的氮化物、氧化物、硼化物、碳化 _ 物者。O:\66\66788-910510.ptc 第26頁
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CN103378052A (zh) * | 2012-04-20 | 2013-10-30 | 台湾积体电路制造股份有限公司 | 半导体器件及其制造方法以及形成导电部件的方法 |
CN103378052B (zh) * | 2012-04-20 | 2016-06-08 | 台湾积体电路制造股份有限公司 | 半导体器件及其制造方法以及形成导电部件的方法 |
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KR20030005111A (ko) | 2003-01-15 |
KR100408953B1 (ko) | 2003-12-11 |
US6897143B2 (en) | 2005-05-24 |
KR100390737B1 (ko) | 2003-07-10 |
KR20010050830A (ko) | 2001-06-25 |
US20040005774A1 (en) | 2004-01-08 |
US6611060B1 (en) | 2003-08-26 |
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