TW388082B - Selective removal of tixny - Google Patents
Selective removal of tixny Download PDFInfo
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- TW388082B TW388082B TW086119237A TW86119237A TW388082B TW 388082 B TW388082 B TW 388082B TW 086119237 A TW086119237 A TW 086119237A TW 86119237 A TW86119237 A TW 86119237A TW 388082 B TW388082 B TW 388082B
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- tin
- oxygen
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- 238000000034 method Methods 0.000 claims abstract description 60
- 239000007789 gas Substances 0.000 claims abstract description 17
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims abstract description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 239000001301 oxygen Substances 0.000 claims abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 15
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 13
- 239000011737 fluorine Substances 0.000 claims abstract description 13
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims abstract 4
- 239000010410 layer Substances 0.000 claims description 62
- 238000005530 etching Methods 0.000 claims description 41
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 28
- 230000004888 barrier function Effects 0.000 claims description 16
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 16
- 229910052721 tungsten Inorganic materials 0.000 claims description 16
- 239000010937 tungsten Substances 0.000 claims description 16
- 229910052681 coesite Inorganic materials 0.000 claims description 14
- 229910052906 cristobalite Inorganic materials 0.000 claims description 14
- 229910052682 stishovite Inorganic materials 0.000 claims description 14
- 229910052905 tridymite Inorganic materials 0.000 claims description 14
- 238000009792 diffusion process Methods 0.000 claims description 12
- 235000012239 silicon dioxide Nutrition 0.000 claims description 12
- 239000000377 silicon dioxide Substances 0.000 claims description 12
- 238000011049 filling Methods 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 235000015170 shellfish Nutrition 0.000 claims description 9
- 239000012808 vapor phase Substances 0.000 claims description 9
- 239000010936 titanium Substances 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 229910052719 titanium Inorganic materials 0.000 claims description 7
- 238000000137 annealing Methods 0.000 claims description 4
- 230000002079 cooperative effect Effects 0.000 claims description 4
- 230000005284 excitation Effects 0.000 claims description 4
- 229920002120 photoresistant polymer Polymers 0.000 claims description 4
- 238000010849 ion bombardment Methods 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- 229910021341 titanium silicide Inorganic materials 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims 2
- 229910021529 ammonia Inorganic materials 0.000 claims 1
- 125000004429 atom Chemical group 0.000 claims 1
- 125000004430 oxygen atom Chemical group O* 0.000 claims 1
- 230000002265 prevention Effects 0.000 claims 1
- 239000002356 single layer Substances 0.000 claims 1
- RCYJPSGNXVLIBO-UHFFFAOYSA-N sulfanylidenetitanium Chemical compound [S].[Ti] RCYJPSGNXVLIBO-UHFFFAOYSA-N 0.000 claims 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract description 63
- 230000008569 process Effects 0.000 abstract description 36
- 239000000463 material Substances 0.000 abstract description 12
- 229910008479 TiSi2 Inorganic materials 0.000 description 22
- DFJQEGUNXWZVAH-UHFFFAOYSA-N bis($l^{2}-silanylidene)titanium Chemical compound [Si]=[Ti]=[Si] DFJQEGUNXWZVAH-UHFFFAOYSA-N 0.000 description 18
- 239000010408 film Substances 0.000 description 10
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 9
- 235000012431 wafers Nutrition 0.000 description 9
- 238000005229 chemical vapour deposition Methods 0.000 description 8
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 238000005192 partition Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- WYEMLYFITZORAB-UHFFFAOYSA-N boscalid Chemical compound C1=CC(Cl)=CC=C1C1=CC=CC=C1NC(=O)C1=CC=CN=C1Cl WYEMLYFITZORAB-UHFFFAOYSA-N 0.000 description 4
- 229910021332 silicide Inorganic materials 0.000 description 4
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005240 physical vapour deposition Methods 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000004380 ashing Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- XROWMBWRMNHXMF-UHFFFAOYSA-J titanium tetrafluoride Chemical compound [F-].[F-].[F-].[F-].[Ti+4] XROWMBWRMNHXMF-UHFFFAOYSA-J 0.000 description 2
- -1 Hydroxide Nitride Chemical class 0.000 description 1
- 229910010342 TiF4 Inorganic materials 0.000 description 1
- 229910008484 TiSi Inorganic materials 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
Classifications
-
- 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
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
-
- 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
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
- H01L21/31116—Etching inorganic layers by chemical means by dry-etching
- H01L21/31122—Etching inorganic layers by chemical means by dry-etching of layers not containing Si, e.g. PZT, Al2O3
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
-
- 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
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32133—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only
- H01L21/32135—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only
- H01L21/32136—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only using plasmas
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Plasma & Fusion (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrodes Of Semiconductors (AREA)
- Drying Of Semiconductors (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
Description
經濟部智慧財產局員工消費合作社印製 T專丨 iv叫 .丨'! f八 Α7 Β7
專利申請案第86119237號 _ ROC Patent Appln. No. 86119237 修正之中文說明書第3頁-附件一 Anended Fto 3 of the Chinese Scecificatiai- Eh± I '--:------ (88年9月7日送呈) i 五、發明說明(1.) (Submitted on September 7,1999)〔 i: 背景及發明之概述 本發明係關於積體電路結構及製造方法。 背景:去除TixNy薄膜 ’ 氮化鈦(TixNy)在積體電路處理為非常有用之材料,並 且在觸點,通路’及溝槽以及在互相連接疊層常使用作為 擴散障壁。其也可用作一供化學蒸敷(CVD)鎢之"粘膠層" 及一供CVD鎢及CVD鋁之核晶作用層。然而,自高縱橫比 結構去除TixNy薄膜,而最少浸蝕來自晶圓表面之其他材 料,在過去經証明困難。 例如,在W/TiN閘,不易對退火邊角損壞進行"微笑氧 化作用",因為鎢本身會氧化。因而必要下切TiN或將其 去除而不損壞閘氧化物。 目前,濕過程用以下切TiN,因為此等過程對鎢(W)缺 少必要之選擇性,閘結構需要在進行下切過程前,以一隔 板+以加蓋。這增加裝置製造過程之複雜性,並減少過程 "空窗"(亦即過程對變化之容限),因為下切之量係依隔板 厚度而定。 背景:無多晶矽電晶體閘 人們曾建議一種M0SFET閘結構(特別是供DRAM),其中 一擴散障壁層直接覆蓋閘氧化物,及一層金屬(而非多晶 矽)覆蓋擴散障壁。例如,此結構之一種實例將為一 WqiN 閘結構,如在 1995 年 Symposium on VLSI Technology Digest ’ p. 119-20(1995),Lee 等人之"Characteristics of CMOSFET*s with sputter-deposited W/ TiN stack gate"; 3 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) — — — — — III — — — - I I I I I I I ' — — — — — —I — (請先閲讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 T專丨 iv叫 .丨'! f八 Α7 Β7
專利申請案第86119237號 _ ROC Patent Appln. No. 86119237 修正之中文說明書第3頁-附件一 Anended Fto 3 of the Chinese Scecificatiai- Eh± I '--:------ (88年9月7日送呈) i 五、發明說明(1.) (Submitted on September 7,1999)〔 i: 背景及發明之概述 本發明係關於積體電路結構及製造方法。 背景:去除TixNy薄膜 ’ 氮化鈦(TixNy)在積體電路處理為非常有用之材料,並 且在觸點,通路’及溝槽以及在互相連接疊層常使用作為 擴散障壁。其也可用作一供化學蒸敷(CVD)鎢之"粘膠層" 及一供CVD鎢及CVD鋁之核晶作用層。然而,自高縱橫比 結構去除TixNy薄膜,而最少浸蝕來自晶圓表面之其他材 料,在過去經証明困難。 例如,在W/TiN閘,不易對退火邊角損壞進行"微笑氧 化作用",因為鎢本身會氧化。因而必要下切TiN或將其 去除而不損壞閘氧化物。 目前,濕過程用以下切TiN,因為此等過程對鎢(W)缺 少必要之選擇性,閘結構需要在進行下切過程前,以一隔 板+以加蓋。這增加裝置製造過程之複雜性,並減少過程 "空窗"(亦即過程對變化之容限),因為下切之量係依隔板 厚度而定。 背景:無多晶矽電晶體閘 人們曾建議一種M0SFET閘結構(特別是供DRAM),其中 一擴散障壁層直接覆蓋閘氧化物,及一層金屬(而非多晶 矽)覆蓋擴散障壁。例如,此結構之一種實例將為一 WqiN 閘結構,如在 1995 年 Symposium on VLSI Technology Digest ’ p. 119-20(1995),Lee 等人之"Characteristics of CMOSFET*s with sputter-deposited W/ TiN stack gate"; 3 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) — — — — — III — — — - I I I I I I I ' — — — — — —I — (請先閲讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印聚 A7 B7 五、發明説明(2 ) 或 Symposium on VLSI Technology Digest ’ Lee 等人之"Gate oxide integrity (GOI) of MOS transistors with W/ TiN stacked gate"中所說明;二:者均經予併入本案供作參考。 然而,此等先進結構在處理上有特定之困難。困難之一 在於正常之多晶矽閘結構,通常將有若干對閘邊角輪廓" 微笑"之元件。此係因為在多晶矽慣常暴露至短氧化作用 以密封其側壁時,在閘氧化物’在多晶矽閘之邊角下面也 發生若干另外之氧化作用。這恰好在邊角下面產生一種略 微較厚之閘氧化物,其復改進閘結構之完整性^ (否則為 在閘邊角之場增強,以及熱載體損壞之傾向,如果在此處 發生任何此種損壞’將會使閘邊角下面之氧化物為可能早 期失效之區域。)
TiN蝕刻過程
本案發明人發現一種使用外界電漿以激勵氟化氧源氣體 混合物,產生作用物質以最少浸蝕其他材料來蝕刻TixNy ’藉以去除TixNy薄膜之方法。特別是,使用各向同性 乾姓刻,供在W/TiN閘結構選擇性去除TiN,以下切TiN 薄膜。過程選擇性最佳化可最少去除閘氧化物及鎢,因此 無需帽蓋隔板。 本發明之TiN去除方法特別有利於次微米裝置過程。本 發明之創新方法所提供之優點包括: 改進選擇性; 降低化學品消耗; 降低環境影響; • ^——r———1L----------lr(------ΐτ 一 (請先聞讀背面之注意事項再填寫本頁) 4 經濟部中央標準局貝工消費合作社印^ A7 B7 五、發明説明(3 ) 去除過程之較佳控制; 無需帽蓋隔板以在TiN蝕刻保護w; 可容易控制過程終點’導致遠為較寬之過程空窗;以及 閘蚀刻過程可與抗蝕劑去除步驟整合,因此簡化製造流 附圖之簡要說明 所揭示之發明將參照附圖予以說明,其示本發明之重要 樣本實施例’並且其經予併入本案供作參考,在附圖中: 圖1示選擇性去除TiN之工序流程; '圖2A-2E示一 WTia傅結構之蝕刻;以及 圖3A-3C示自破化物結構選择性去除τ i N。 較佳實施例之詳細說明 本案之很多創新旨意將特別參照現為較佳實施例予以說 明。然而,請予瞭解’此類實施例僅提供很多有利使用本 案創新旨意之少數實例。通常,在本案詳細說明所作之陳 述不一定限定本發明申請專利範圍各項之任何一項。而且 ,有些陳述可適用於有些創新特色但不適用於於其他特色 〇 在本發明之創新方法’與使用液體化學品以進行TixNy 去除之標準現行過程比較,電漿釋放(諸如單原子氧及氟) 所產生之物質為過程之主要作用組份。供在W/TiN閘去除
TiN ’可使用一種最佳化各向同性乾蝕刻代替濕蝕刻處理 〇 樣本實施例:蝕刻W/TiN閘 5 本紙张尺度適用中國國家標準(CNS ) A4規格(210X297公釐) m n^i n^i il^^i i m m 1 t) mi n 一 s. 1 (請先聞讀背面之注項再填寫本I) 經濟部中央標率局貝工消费合作社印^ A7 B7__ 五、發明説明(4 ) 圓1示電晶體閘製造之一種較佳方法之工序流程,及 圚2A-2E示在製造樣本W/TiN閘結構之連續階段。 如在圖2A中可看出,在敷著一鈦氮化物障壁層220前 ,在一矽基片200上面形成一閘氧化物層210(例如Si02) 〇 物理蒸敷(PVD)及金屬有機化學蒸敷(MOCVD)過程可用以 敷著TiN層。另外,敷著可在供PVD及MOCVD過程之Applied Material ENDURA 5500 及 Applied Material P5000 反應 器進行。 隨後,在TiN層敷著一層鎢230,並塗布一光敏抗蝕劑 240,其然後予以作成圖案(步驟110)。 在任選之步驟120,光敏抗蝕劑240然後予以矽烷化( 使用"DESIRE"過程),以形成一硬掩模層250 »鎢蝕刻(步 驟130)使用一種習知氟基蝕刻化學性質,並且這導致囷2B 之鲒構。請察知,鎢蝕刻在蝕刻部份有略微浸蝕之TiN層 220,但未姓穿》 在界定鎢層230後之清理過程,必須去除位於結構間之 光敏抗蝕劑240及其餘TiN220。在此清理過程,所使用 之基片溫度及氣體予以選擇為供對鎢及Si02之高選擇性 。一乾燥過程用以脫除抗蝕劑240及TiN層.220,而有小 TiN下切及可忽視之氧化物耗失。無需使用離子轟擊,其 免除需要微笑氧化作用過程。再者,在TiN去除過程可使 用一挎柵以保護結構。 然後進行蝕刻步驟(步驟140),使用一種有02及C2F6 本紙張尺度適用中國國家棣隼(CNS ) A4規格(210X297公釐)
經濟部中央標準局貝工消費合作社印製 源之氣體外界電漿釋放。如在囷2C中可看出,此步驟去 除硬掩模250 ’使鬆散抗蝕劑240露出,並脫除不在閘下 面之一部份或所有TiN220。為避免損壞下面之薄閘氧化 物層210,其在此實例有一厚度僅約為3 〇毫微米,鎢蝕 刻必須在TiN層220停止。 隨後進行灰化步驟(步驟150),以脫除其餘抗蝕劑24〇( 圖2中所示广此步驟也使用外界電漿激勵,但源氣體為 無氟之純氧》 最後,在任選之步驟160(在厚TiN層之情形),由〇2/C2F6 所進給之外界電漿之另一蝕刻步驟(步驟16〇),去除任何 其餘TiN殘留物220。這導致圖2E之結構》 在一種樣本測試運轉,在使用感應耦合電漿源(Icp源) 之Mattson ASPEN11灰化器進行乾燥清潔過程,以產生作 用物質。在作成圖案之結構進行測試,並藉TEM完成檢查 。在此測試運轉測試三閘整層。 第一閘壘層包括自頂部至底部之下列諸層:3〇毫微米
Si3N4; 80毫微米W;20毫微米TiN;以及3.0毫微米Si02; 而有Si在疊層下面。第二閘疊層有下列諸層:3〇毫微米
Si02;80毫微米W;20毫微米TiN; 3毫微米Si02;以及Si 。第三閘疊層包括:30毫微米Si3N4;80毫微米ff; 1〇毫 微米TiN; 3毫微米Si 02;以及在底部之si。以下為使用 於樣本測試運轉之特定參數:〇2流量:3〇〇〇sccm;C2F6流量 :6 s c c m;壓力:1 · 3托;功率:9 75 ;溫度:室溫;T i N蝕刻速率 :0.64毫微米/秒;W蝕刻速率:〇·27毫微米/秒;時間:25 7 本紙張尺度適用中國國家梯準(CNS ) A4^#- ( 210x297^ ) (請先閲讀背面之注意事項再填寫本頁)
經濟部中央標準局貝工消費合作社印製 A7 B7 五、發明说明(6) 秒。 隨後,較佳為在純氧進行灰化步驟,以去除其餘鬆散抗 蝕劑。達成在3毫微米Si02層完全去除20毫微米TiN層 ’而不損壞氧化物。帽蓋層在過程不具有效應β在2〇毫 微米層TiN之情形,必須使用一殘留物去除步驟;但在1〇 毫微米層TiN之情形,不需要此去除步驟,俾使下切最小 。依TiN層之初始厚度及在鶴蚀刻之蚀刻量而定,過程時 間可自20至30秒不等。 晶圓溫度對選擇性具有顯著之效應。減低溫度,較佳為 至室溫度(亦即少於50度C) ’氧化物蚀刻速率減低,並 且TiN蝕刻速率維持相同。減低溫度可達成選擇性高於2〇 ,其可藉上面所說明之乾燥過程,替代TiN之濕去除,如 在下列資料所例示: 1) 晶圓溫度:250C;TiN姓刻速率:〇, 558毫微米/秒;Si〇2 蝕刻速率:0.070毫微米/秒;選擇性:7. 97。 2) 晶圓溫度:室溫;TiN蚀刻速率:〇. 636毫微米/秒;Si〇2 蝕刻速率:0· 030毫微米/秒;選擇性:21. 20。 氮化鈦正常使用氣基蚀刻予以蚀刻。二氧化鈦為極端非 揮發性(實在為耐火),並且氟化鈦正常也被視為非揮發性 。(TiF4在攝氏284度在一大氣環境壓力昇華。)因此, 非常意想不到,氮化鈦如在現為較佳實施例,藉高〇:F比 之氧/氟蝕刻’可適當進行下切蝕刻。然而,此化學性質 業經發現提供適當蝕刻速率,及具有對矽化鈦具有高選擇 性之特定優點。 (請先閲讀背面之注項再填寫本頁) Λ 經濟部中央標率局貝工消費合作社印製 A7 B7 五、發明説明(7 ) ~~
替代性實施例:選擇性在Si02上面蝕刻TiN 本案也揭示蝕刻TiN,而對Si02具有高選擇性之過程 。自一在一層Si02上面蝕刻一層TiN之實際測試運轉, 獲得下列結果。在10毫微米Si02有50毫微米之敷著TiN 之晶圓,在Mattson ASPEN11灰化器予以處理不同次數。 在外界自基片之感應耦合電漿釋放產生激勵物質。藉一加 熱之夾頭使基片保持在溫度250度C。自一 Prometrix-Omni Map R555/tc工具所測量之薄胰薄片電阻之變化計算求得 TiN耗失。 02 流量:3000sccm; C2F6 流量:6sccm; 壓力:1. 3托; 功率:975W; 溫度:室溫;
TiN蝕刻速率:0.64毫微米/秒;
Si02蝕刻速率:0.03毫微米/秒。 明示閘氧化物完整性(G0I)及電容/電壓曲線不 被TiN蝕刻所變化(在蝕刻前後無顯著差異)^因此,此等 結果顯示薄閘氧化物在TiN蝕刻後完全未受損壞。 替代性實施例:羥基氮化物閘介電質 在此替代性實施例,閘介電質不僅為一種增長氧化物, 而且為一種習知之<6夕經基氮化物閘結搆。 發明人曾以實驗確定所揭示之氧氟TiN蝕刻對矽氮化物 也具有選擇性。因此使用任何羥基氮化物閘介電質,預期 9 本紙張尺度適用中國國家橾準(CNS ) A4規格(210X297公釐) I HI— H - lnl«r^f * - I I I —— I 訂 /i (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標準局貝工消費合作社印製 A7 B7 五、發明説明(8 ) ' 對閘介電質將會導致氮化鈦蚀刻之甚至更大選擇性。
替代性實施例:在TiSi2選擇性敍刻TiN 吾人曾進行一種相似之實驗,以評量在〇2+C2F6電漿之 TiSi2之蝕刻速率《在此情形,無定形TiSi2予以濺射敷 著在Si02。下列資料例示自一在一層TiSi2蝕刻一層TiN 之實際測試運轉所獲得之結果β 02 流量:3000sccm; C2F6 流量:30sccm; 壓力:1. 3托; 功率:975W; 溫度:室溫;
TiN蝕刻速率:1. 82毫微米/秒;
TiSi2蝕刻速率:0.4毫微米/秒〇 下列資料示薄膜耗失及選擇性在02+C2F6為過程時間之 函數: 10秒後:TiN耗失4. 3毫微米;a-TiSi2耗失2. 4毫微米; 選擇性(TiN/TiSi2):1.8。 ’ 20秒後:TiN耗失10. 5毫微米;〇:-TiSi2耗失4. 1毫微 米;選擇性2.6。 60秒後:TiN耗失32.3毫微米;a-TiSi2耗失11.6毫微 米;選擇性2.8» 120秒後:TiN耗失65. 9毫微米(估計);α -TiSi2耗失 23.8毫微米;選擇性2.8。 180秒後:TiN耗失99. 4毫微米(估計);a-TiSi2耗失 10 本紙張尺度適用中國國家梂準(CNS > A4規格(210X 297公慶)—--- H— - - I - J 1 — I I * -.1 — - 1· - I I n (靖先閲讀背面之注f項再填寫本頁〕 A7 發明説明(9) 38. 1毫微米;選擇性2. 6。 自選擇性展望’去除滅射TiSi2之結果表示最壞情形之 情況。由於為無定形,濺射之TiSi2薄膜較Ti與Si反應 所形成之結晶TiSi2薄膜蝕刻更快速。在蝕刻C54相TiSi2 之情形’可清楚看出此情形β 然而,根據在本案所揭示之方法,暴露至〇2+C2F6電漿 20秒’僅去除〇· 7毫微米之TiSi2(C54),產生TiN/TiSi(C54) 之選擇性為14. 8»此為優於濺射之TiSi2所觀察結果之 顯著改進,並且允許自二氧化矽部位去除未反應之TixNy 薄膜’而不以顯著方式影響所形成之TiSi2層》 使用電漿源所激勵之氟化氣體之稀釋混合物,對選擇性 蚀刻TixNy薄膜提供必要之物質,而不顯著去除TiSi2及 Si02。 樣本矽化物過程實施例 如圖3A-3C中所示,在自對齊矽化過程,在晶圓上敷著 一層鈦340作為一遮蓋薄膜。晶圓一般包括一矽基片300 ,其有淺溝槽隔離310(例如Si02)之位置,以及由多晶矽 所組成’有側壁隔板330之閘電極320»然後在一種Applied Material ENDURA 5500系統敷著約40毫微米之鈦》 經濟部中央標準局貝工消費合作社印裝 (請先閲讀背面之注$項再填寫本頁) 然後如圖3B中所示,使用N2環境電漿源將晶圓退火., 使鈦340在閘320,源及汲極部位與矽反應,以形成TiSi2 360。反應也發生在互相連接多晶矽線。然而,在鈦340 位於於二氧化矽310之部位,無TiSi2形成,並且鈦變換 成為TixNy350。可在ENDURA 5500系統,藉快速熱處理(RTP) 11 本紙張尺度適用中國國家標率(CNS ) A4規格(210X:297公釐) 經濟部中央摞隼局員工消費合作社印製 A7 B7 五 '發明説明(10 ) ,在約700度C ’在N中約60秒達成形成矽化物層。去 除TixNy薄膜350為矽化物過程之一關鍵部份,因為需要 最少損壞形成TiSi2 360以及最少耗失Si02 310。根據 本發明之一種實施例’如在圖3C中可看出,使用02+C2F6 外界電漿蝕刻’兩種需要均獲得滿足。隨後,晶圓可在 ENDURA 5500系統,在約850度C,接受最後退火約30秒 。對(C54)TiSi2相去除TiN,獲得選擇性高於10。 根據所揭示之一類創新實施例,提供:一種蝕刻一包含 氮化鈦之層之方法,包含下列步驟:電磁激勵一内含氧及 氟之源氣體混合物’藉以產生一汽相蚀刻劑;以及使該層 暴露至汽相蝕刻劑;其中進行步驟(b.),而不離子轟擊該 結構。 根據所揭示之另一類創新實施例,提供:一種自對齊矽 化物包括露出之矽部位部份,製造積體電路結構之方法, 包含下列步驟敷著一包含鈦外罩之金屬遮蓋層;使該結構 在一種帶氮環境退火,以在該露出之矽部位形成一主要包 含石夕化鈥之第一化合物,及在在別處形成一主要包含氮化 鈦之第二化合物;以及暴露至一由電磁性激勵内含氧及氟 ’氧對氟之原子比至少為10:1之源氣艎混合物所產生之 汽相蝕刻劑’藉以去除該第二化合物,而不去除所有該第 一化合物;其中進行該去除步驟,而無離子轟擊該結構。 根據所揭示之另一類創新實施例,提供:一種製造閘結 構之方法,包含下列步驟:形成一薄閘介電質,及形成一 在其上包含氮化鈦之擴散障壁層;形成一覆蓋該擴散障壁 12 本紙张尺度適用中國国家轉(CNS )八4胁(2⑴心了公產) (請先W讀背面之注#^項再填寫本頁) 訂 A7 _____B7 五、發明説明(11 ) '~ 層,作成圖案之金屬層;去除該擴散障壁層之部份,而關 於該薄閘介電質無選擇性離子轟擊,暴露至一由電磁性激 勵内含氧及氟,氧對氟之原子比至少為10:1之源氣艘混 合物所產生之汽相蝕刻劑,從而選擇性去除該擴散障壁層 ,而最少損壞該薄閘介電質》 修改及變化 如精於此項技藝者將會認知,在本案所說明之創新概念 可在很大應用範圍予以修改及改變’因之申請專利内容之 範圍不受任何所示特定例証性旨意所限制。 當然各種結構可用以實施閘之金屬層(或諸層)。在替代 性實施例,各種材料及材料之組合可用以實施金屬層。 當然,所示之特定蝕刻化學作用,層組成,及層厚度僅 為例證性,並且決不限定申請專利之本發明之範圍。 ^^1 m h ίβ mi 8 Γ · (請先閎讀背面之注$項再填寫本頁)
、tT 經濟部中央標率局貝工消费合作社印聚
Claims (1)
- 388082申請專利範圍 1. 一種蝕刻一包含氮化鈦之層之方法,包含下列步驟: (a.)電磁性激勵一内含氧及氨之氣氣趙混合物,藉以產 生一汽相蝕刻劑;以及〜 (請先閱讀背面之注意事項再填寫本頁) (b.丨)使該層暴露至該汽梧蝕刻.劑;其中進行該步騍(b.), 而無離子轟擊該結構。 2. 根轉中請專利範圍第μ之方法,其中該源氣體混合物 有一氧原子對襄原子之原子比,其至少為1 〇 1。 3. 板;據申請專利範圍第1項之方法,其中該源氣體混合物 係由C2跗及02之混合物組成。 冬根據申請專利範圍第1項之方法、其中該步驟(b)係在 溫度少於100度c進行。 ,1T 5. 根據申請專利範圍第i項之方法,其中該步驟(b.)使用 一格柵,以防止離子轟擊。 6. 根據申請專利範圍第}項之方法,其中包含氮化鈦之該 層覆蓋一層Si02,並且該步驟(b·)自該Si〇2之表面選擇 性去除包含氮化鈦之該層。 7. 根褲申請專利範圍第丄項之方法,其中該步驟(b )也使 矽化鈦暴露至汽相彼刻劑,並且關於石夕化鈦選擇性去除包 含氮化鈦之該層。 經濟部中央標準局負工消费合作社印*. 8· —種自—聲资镑化未完成積體電路結構之方法該結構包 括露出之矽部位’該方法包含下列步称· (a.)敷奢一包含鈦命罩之金屬遮蓋層; (b.)使該結構在一種帶氮環境退火,以在該露出之矽部 位形成主要包含矽化鈦之第一化合物’以及在別處形成主B8 C8 D8 388082 六、申請專利範圍 要包含氮化鈦之第二化合物;以及 (請先閱讀背面之注意事項再填寫本頁) (C.)暴露至一由電磁性激勵内含氧及氣,氧對農之原干 至少為1 〇: 1之源氣體混·合物所產生之汽相蚀刻劑,藉 以去除該第二化合物而不去除所有該第一化合物; 其中進行去除該步驟,而無離子轟擊該Λ结構。 9·根據申請專利範圍第8項之方法,-其中内含氧及氟之該 源氣意混合物有一氧對氳之原子比至少為: 1 » 10·根據申請專利範圍第8項之方法,其中在溫度少於1〇〇 度C進行去-除該屠怎化鈥之步驟。 11 · 一種製造閉,結構之方法,包含下列步驟: (a.)形成一薄閘介電質,及在其上形〜成一包含氮化鈦之 擴散障壁層; 訂 (I.)形成一作|圓案之金屬層|蓋該擴散障壁層; (c.)暴露至+—由電磁性激勵内含氧友_氣,氧對氟之原子 比.至少為1 〇: 1之源.、氣艘混合物所產生之汽相姓刻劑,藉 以κ网於該薄閘介電質屢擇性該擴教障壁層之部份,而無雖 子轟擊該結構; 味.> Γ從而選擇性去除該推散障壁層,而最少小損壞該薄閘介電 、質。 經濟部中央標準局属工消费合作社印製 li根據申請專利範圍第11項之方法,另包含在去除步驟 (c.)後,暴露至一由電磁性激勵内含氧及氟,氧對氟之原 子比為在1000:1與無限間之源氣趙混合物所產生之汽相 蝕敲劑之隨後光舞抗蝕劑去除步驟。 1曼.根據申請專利範圍第u項之方法,其中該金屬層係由 15 經濟部中央標準局貝工消費合作社印製 383082 cl JL/o 六、申請專利範圍 一單一層鎢所構成。 訂-------1- (請先閲讀背面之注意事項再填寫本頁)本紙張尺度適用中國國家橾準(CNS ) A4規格(210X297公釐)
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KR19980064255A (ko) | 1998-10-07 |
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