TWI650819B - 形成隔離層的方法 - Google Patents
形成隔離層的方法 Download PDFInfo
- Publication number
- TWI650819B TWI650819B TW104106170A TW104106170A TWI650819B TW I650819 B TWI650819 B TW I650819B TW 104106170 A TW104106170 A TW 104106170A TW 104106170 A TW104106170 A TW 104106170A TW I650819 B TWI650819 B TW I650819B
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- Prior art keywords
- layer
- interlayer dielectric
- vertical structure
- providing
- substrate
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 81
- 238000002955 isolation Methods 0.000 title claims abstract description 55
- 239000010410 layer Substances 0.000 claims abstract description 230
- 239000011229 interlayer Substances 0.000 claims abstract description 169
- 238000005498 polishing Methods 0.000 claims abstract description 53
- 239000000126 substance Substances 0.000 claims abstract description 50
- 239000000758 substrate Substances 0.000 claims abstract description 48
- 238000010884 ion-beam technique Methods 0.000 claims description 23
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 16
- 238000001020 plasma etching Methods 0.000 claims description 16
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 16
- 238000001039 wet etching Methods 0.000 claims description 16
- 238000005530 etching Methods 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 230000005669 field effect Effects 0.000 claims description 9
- 229910021332 silicide Inorganic materials 0.000 claims description 9
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 description 40
- 239000007789 gas Substances 0.000 description 35
- 235000012431 wafers Nutrition 0.000 description 17
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 14
- XPDWGBQVDMORPB-UHFFFAOYSA-N Fluoroform Chemical compound FC(F)F XPDWGBQVDMORPB-UHFFFAOYSA-N 0.000 description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 238000000227 grinding Methods 0.000 description 12
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 9
- 229910002091 carbon monoxide Inorganic materials 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- QKCGXXHCELUCKW-UHFFFAOYSA-N n-[4-[4-(dinaphthalen-2-ylamino)phenyl]phenyl]-n-naphthalen-2-ylnaphthalen-2-amine Chemical compound C1=CC=CC2=CC(N(C=3C=CC(=CC=3)C=3C=CC(=CC=3)N(C=3C=C4C=CC=CC4=CC=3)C=3C=C4C=CC=CC4=CC=3)C3=CC4=CC=CC=C4C=C3)=CC=C21 QKCGXXHCELUCKW-UHFFFAOYSA-N 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 229910010271 silicon carbide Inorganic materials 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 150000004767 nitrides Chemical class 0.000 description 4
- 229920003209 poly(hydridosilsesquioxane) Polymers 0.000 description 4
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- AUEPDNOBDJYBBK-UHFFFAOYSA-N [Si].[C-]#[O+] Chemical compound [Si].[C-]#[O+] AUEPDNOBDJYBBK-UHFFFAOYSA-N 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 239000001307 helium Substances 0.000 description 3
- 229910052734 helium Inorganic materials 0.000 description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 3
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 3
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000007517 polishing process Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
- GPXJNWSHGFTCBW-UHFFFAOYSA-N Indium phosphide Chemical compound [In]#P GPXJNWSHGFTCBW-UHFFFAOYSA-N 0.000 description 2
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 2
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 229910000673 Indium arsenide Inorganic materials 0.000 description 1
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 1
- HYXIRBXTCCZCQG-UHFFFAOYSA-J [C+4].[F-].[F-].[F-].[F-] Chemical compound [C+4].[F-].[F-].[F-].[F-] HYXIRBXTCCZCQG-UHFFFAOYSA-J 0.000 description 1
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy 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
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 229940075614 colloidal silicon dioxide Drugs 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- RPQDHPTXJYYUPQ-UHFFFAOYSA-N indium arsenide Chemical compound [In]#[As] RPQDHPTXJYYUPQ-UHFFFAOYSA-N 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—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
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- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
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- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823885—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of vertical transistor structures, i.e. with channel vertical to the substrate surface
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Abstract
本發明提供了一種形成隔離層的方法。該方法包括以下步驟:提供一基板;提供一在基板上方具有第一層的垂直結構;在第一層上提供一第一層間介電質;在第一層間介電質進行化學機械研磨;最後回蝕第一層間介電質和前述第一層,以形成一對應於垂直結構之源極的絕緣層。
Description
本發明係有關於一種半導體的製造方法,且特別是有關於一種在垂直半導體元件形成絕緣層的製造方法。
垂直半導體元件,例如垂直環繞式閘極電晶體(vertical gate-all-around transistor),是半導體產業中的一個新興研究領域。然而由於垂直半導體元件的低微影密度可能會影響對層間介電質(inter-layer dielectric)(或絕緣層)厚度一致性的控制,因此尋找一個能改善上述問題的新方法實屬必要。
本發明提供一形成隔離層的方法,其包括以下步驟:提供一基板;提供一垂直結構,其基板上具有一第一層;在第一層上提供一第一層間介電質;在第一層間介電質進行化學機械研磨(CMP);和回蝕第一層間介電質和前述第一層,以形成一對應於垂直結構之源極的隔離層。
本發明亦提供一形成隔離層的方法,其包括以下步驟:提供一具有底部層間介電質之基板;提供一垂直結構,其基板上具有一第一層;在第一層和底部層間介電質上提供一第一層間介電質;在第一層間介電質進行化學機械研磨;和回蝕第一層間介電質,以形成一對應於垂直結構之通道的隔離層。
本發明更提供一形成隔離層的方法,其包括以下步驟:提供一具有中間層間介電質之基板;提供一垂直結構,其基板上具有一第一層;在第一層和中間層間介電質上提供一第一層間介電質;在第一層間介電質進行化學機械研磨;和回蝕第一層間介電質,以形成一對應於垂直結構之汲極的隔離層。
100‧‧‧半導體元件
101、1201、2101‧‧‧基板
102‧‧‧淺溝槽隔離層
110、120、1210、2110‧‧‧垂直結構
111‧‧‧N型井(N well)
112、122‧‧‧源極
113、123、1404、1604、1904‧‧‧通道
114、124、1406、1514、1606、1906、2404、2704‧‧‧汲極
115、116、125、126、2008‧‧‧矽化物
121‧‧‧P型井(P well)
202、1212、2112‧‧‧第一層
204、1204、2104‧‧‧第一層間介電質
402、602、902、1402、1602、1902、2202、2402、2702‧‧‧隔離層
502、1502、2302‧‧‧預定厚度
504、704、2504‧‧‧第二層間介電質
702、1702、2502‧‧‧第二層
702a‧‧‧第二層702的上端部分區域,對應於第一垂直結構110的突起部位
702b‧‧‧第二層702的下端部分區域,對應於除了垂直突起部位以外的下方區域
1002、1102、2002‧‧‧高k介電層
1004、1006、1104、1106、2004、2006‧‧‧功函數金屬(work function metal)層
1008、1108‧‧‧金屬閘極
1202‧‧‧底部層間介電質
1702a‧‧‧第二層1702的上端部分區域,對應於第一垂直結構1210的突起部位
1702b‧‧‧第二層1702的下端部分區域,對應於除了垂直突起部位以外的下方區域
2102‧‧‧中間層間介電質
2502a‧‧‧第二層2502的上端部分區域,對應於第一垂直結構2110的突起部位
2502b‧‧‧第二層2502的下端部分區域,對應於除了垂直突起部位以外的下方區域
2800、2900‧‧‧形成垂直結構的方法流程圖
2802、2804、2806、2808、2810、2902、2904、2906、2908、2910‧‧‧方法2800與2900的各步驟示意圖
為協助讀者達到最佳理解效果,建議在閱讀本專利說明書時同時參考附件圖示及其詳細文字敘述說明。請注意為遵循業界標準作法,本專利說明書中的圖式不一定按照正確的比例尺繪製。在某些圖式中,尺寸可能刻意放大或縮小,以協助讀者清楚了解其中的討論內容。
圖1至圖11為本發明一實施例的半導體元件剖面示意圖。
圖12至圖20為本發明另一實施例的半導體元件剖面示意圖。
圖21至圖27為本發明另一實施例的半導體元件剖面示意圖。
圖28為本發明一實施例的流程圖,說明如何形成一垂直結構的一種方法。
圖29為本發明一實施例的流程圖,說明如何形成一垂直結構的一種方法。
圖30為本發明一實施例的流程圖,說明如何形成一垂直結構的一種方法。
本說明書提供了數個不同的實施方法或實施例,可用於實現本發明的不同特徵。為簡化說明起見,本內容書中也同時描述了特定零組件與佈置的範例。請注意提供這些特定範例的目的僅在於示
範,而非對本發明予以任何限制。舉例而言,在以下說明第一特徵如何基於或取代第二特徵而來的敘述中,可能會包括某些實施例,其中第一特徵與第二特徵為直接接觸,敘述中也可能包括其他不同實施例,其中第一特徵與第二特徵中間另有額外特徵,以致於第一特徵與第二特徵並不直接接觸。此外,本說明書中的各種範例可能使用重複的參考數字或文字註記,以使文件更加簡單化和明確,這些重複的參考數字與註記不代表不同的實施例與配置內容之間有任何關聯。
另外,本文件在使用與空間相關的敘述詞彙,如“在...之下”,“低”,“下”,“上方”,“之上”,“下”,“頂”,“底”和類似詞彙時,為便於理解,其用法均在於描述附件圖示中一個元件或特徵與另一個(或多個)元件或特徵的相對關係。除了圖示中所顯示的角度方向外,這些空間相對詞彙也用來描述該裝置在使用中以及操作時的可能角度和方向。當該裝置的角度方向可能不同(旋轉90度或其它方位)時,此時即可根據所使用的空間相關敘述來加以解釋與理解。請注意如果某個特徵是奠基於另一個特徵或基板時,則中間可能有中介特徵的存在。
本公開內容係有關一形成隔離層的方法,也提供了至少四種不同的隔離層製造方式。
第一種方式包括:沉積一層間介電質(interlayer dielectric)在一個具有第一層的垂直結構上;在第一層間介電質進行化學機械研磨(chemical mechanical polishing CMP),在第一層上停止化學機械研磨;並回蝕第一層間介電質及上述第一層。第二種方式包括:沉積一層間介電質在一個具有第一層的垂直結構上;在第一層間介電質進行化學機械研磨,在第一層間介電質的一個預定高度上停止化學機械研磨;並回蝕第一層間介電質及上述第一層。
第三種方式包括:沉積一層間介電質在一個具有第一層
的垂直結構上;在第一層間介電質上提供一個第二層;在第二層上提供第二個層間介電質;在第一層間介電質、第二層、和第二層間介電質上進行化學機械研磨;在第二層較低的區域停止化學機械研磨;並回蝕第一層間介電質及上述第一層。第三種方式也可利用一個類似三明治的三層氮氧化物(ONO)結構(氧化物/氮化物/氧化物)來構成第一層間介電質、第二層、和第二層間介電質。第一層間介電質可以由可流動的氧化物構成;第二層可以由氮化矽(SiN)、氮氧化矽(SiON)、碳化矽(SiC)、氮碳化矽(SiCN)、一氧化碳矽(SiCO)、氮氧碳化矽(SiCON)等構成;第二層間介電質可以由電漿增強氧化物(PE oxide)構成。第二層的厚度大概約為5-300埃。第二層間介電質的厚度大概約為100-3000埃。
第四種方式包括:沉積一層間介電質在一個具有第一層的垂直結構上;在第一層間介電質上進行化學機械研磨;在第一層間介電質的一個預定高度上停止化學機械研磨;並以氣體團簇離子束(gas cluster ion beam)方式回蝕第一層間介電質及上述第一層;在第一層間介電質進行濕式清潔製程;並以電漿蝕刻(plasma etching)或濕蝕刻(wet etching)方式回蝕第一層間介電質及上述第一層。氣體團簇離子束可使用如三氟化氮(NF3)、四氟化矽(SiF4)、三氟甲烷(CHF3)、和四氟化碳(CF4)等氣體。進行氣體團簇離子束製程後也可選擇性使用一後濕式清潔(post wet clean)來減少氣體團簇離子束過程中可能產生的缺陷。
前述四種方法可用於製造下列元件:(1)一對應於垂直結構源極的下部隔離層;(2)一對應於垂直結構通道的中間隔離層;及(3)一對應於垂直結構汲極的上部隔離層。這些方法可確保良好的隔離層厚度均勻性,並提高元件效能。
圖1是本發明一實施例的半導體元件剖面示意圖。在圖1
所示的半導體元件100中,在基板101上具有一第一垂直結構110和一第二垂直結構120。前述之第一垂直結構110和第二垂直結構120可以是被淺溝槽隔離層(shallow trench isolation)102所絕緣的垂直圍繞閘極元件(vertical-gate-all-around device)。第一垂直結構110可以是一包括N型井(N well)111、第一源極112、第一通道113、和第一汲極114的P型場效電晶體(PMOS)。第二垂直結構120可以是一包括P型井(P well)121、第二源極122、第二通道123、和第二汲極124的N型場效電晶體(NMOS)。矽化物115、116、125和126有助於降低接觸電阻。
第一源極112是沈積在N型井111之上,第一通道113是沈積在第一源極112之上,第一汲極114是沈積在第一通道113之上。第二源極122是沈積在P型井121之上,第二通道123是沈積在第二源極122之上,第二汲極124是沈積在第二通道123之上。有鑑於本公開內容以下實施方式中所述之方法均可適用於第一垂直結構110和第二垂直結構120二者,下文將只針對第一垂直結構110加以討論說明。
在本發明一實施例中,基板101包括一晶體矽基板。在其他的實施例中,構成基板101的材料可能是半導體元素如鑽石或鍺;或半導體化合物如砷化鎵(Gallium Arsenide)、碳化矽(Silicon Carbide)、砷化銦(Indium Arsenide)、磷化銦(Indium Phosphide)等;或半導體合金如矽鍺碳(Silicon Germanium Carbide)、磷砷化鎵(Gallium Arsenic Phosphide)、磷化銦鎵(Gallium Indium Phosphide)等。此外,基板101也可能包括一磊晶層(epitaxial layer),或為了提升性能而加以應變(strained),且/或包括一個絕緣體上覆矽(SOI)結構。
圖2是本發明一實施例的半導體元件剖面示意圖。如圖2所示,一第一層202形成於第一垂直結構110之上,上述的第一層202可能由氮化矽(SiN)構成並作為蝕刻停止層。第一層202的厚度大約
在30-300埃之間。在本實施例中,第一層202是包括在前述之第一垂直結構110內。此外,一第一層間介電質204(例如一氧化物層)會形成在第一層202之上。
圖3是本發明一實施例的半導體元件剖面示意圖。如圖3所示,一化學機械研磨(CMP)會在第一層間介電質204進行,並在第一層202停止,如此可提供良好的晶圓均勻性。
圖4是本發明一實施例的半導體元件剖面示意圖。如圖4所示,可藉由濕式蝕刻或電漿蝕刻對第一層間介電質204和第一層202進行回蝕,以形成一對應於第一垂直結構110之源極112的隔離層402。在本實施例中,隔離層402會與源極112的頂部表面對齊,並與通道113相鄰。此方法可確保隔離層402在不同晶圓間仍有良好的厚度均勻性。
圖5是本發明一實施例的半導體元件剖面示意圖。參照圖2與圖5,在第一層間介電質204進行化學機械研磨,直到距離第一垂直結構110一預定厚度502(例如約100-1000埃左右)時停止,一般而言,前述預定厚度502是從第一垂直結構110的汲極114到第一層202間的距離。在第一層間介電質204的預定厚度502停止化學機械研磨可確保良好的晶圓厚度均勻性。
上述之化學機械研磨過程可能包括以下設定:拋光向下力(polishing down force)為約0.5-5psi;平台速度(table speed)約為每分鐘30-110轉(rpm);研磨液種類(slurry type)為二氧化矽(SiO2)、氧化鋁(Al2O3)、或二氧化鈰(CeO2)為底之研磨液;且研磨流量(slurry flow rate)約為每分鐘50-500毫升(ml/min)。
圖6是本發明一實施例的半導體元件剖面示意圖。如圖5和圖6所示,可藉由濕式蝕刻或電漿蝕刻對第一層間介電質204和第一層202進行回蝕,以形成一對應於第一垂直結構110之源極112的
隔離層602,在本實施例中,隔離層602會與源極112的頂部表面對齊,並與通道113相鄰。此方法可確保隔離層602在不同晶圓間仍有良好的厚度均勻性。
在某些實施例中,在利用濕式蝕刻或電漿蝕刻回蝕第一層間介電質204和第一層202之前,會先以氣體團簇離子束對第一層間介電質204和第一層202進行回蝕。
上述之氣體團簇離子束回蝕過程可能包括以下參數:作用氣體(processing gas)包括如三氟化氮(NF3)、四氟化矽(SiF4)、三氟甲烷(CHF3)、或四氟化碳(CF4)等,載體氣體(carrier gas)可以是氮(N2)或氦(He);團簇加速電壓(cluster accelerate voltage)為1KV-200KV;團簇劑量(cluster dose)為每秒1013~1017平方公分(cm2/sec);團簇流量(cluster flow)為每分鐘100-5000標準立方厘米(standard cubic centimeters per minute SCCM);壓力約10-3~10-8托(torr);團簇數量(cluster number)為100~50000分子(molecule);團簇大小(cluster size)約為1~500納米(nanometer)。氣體團簇離子束在第一層間介電質204和第一層202的表面上所產生的等效能量約為每分子1~3電子伏特(eV/molecule),表面溫度可達104K左右。氣體團簇離子束會加熱作用氣體而產生氟氣,並與表面反應形成四氟化矽(SiF4)和氧(O2、O)、一氧化氮(NO)、二氧化氮(NO2)、水(H2O)、一氧化碳(CO)、或二氧化碳(CO2)等揮發性氣體。
在某些實施例中,可選擇使用一後濕式清潔(post wet clean)來減少進行氣體團簇離子束製程時所可能產生的缺陷,前述之濕式清潔製程可使用臭氧(O3)、稀釋的氫氟酸(HF)和氨(Amnonia NH3)等組合進行一至五次不等的清潔。
圖7是本發明一實施例的半導體元件剖面示意圖。如圖2和圖7所示,一個第二層702會形成在第一層間介電質204之上,一
第二層間介電質704會形成在第二層702上。
一個三層氮氧化物(ONO)的三明治結構(氧化物/氮化物/氧化物)可用來形成第一層間介電質204、第二層702、及第二層間介電質704,第一層間介電質204可以由可流動的氧化物構成;第二層702可以由氮化矽(SiN)、氮氧化矽(SiON)、碳化矽(SiC)、氮碳化矽(SiCN)、一氧化碳矽(SiCO)、或氮氧碳化矽(SiCON)等構成;第二層間介電質704可以由電漿增強氧化物(PE oxide)構成。第二層702的厚度大概約為5-300埃。第二層間介電質704的厚度大概約為100-3000埃。
此外,第二層702的上端部分區域702a指的是第一垂直結構110的突起部位;第二層702的下端部分區域702b指的是除了垂直突起部位以外的下方區域。一般情況下具有突起的部分僅佔整個晶圓面積的不到10%,因此第二層702的部分區域702a相較702b而言更易受到化學拋光研磨過程的影響。
圖8是本發明一實施例的半導體元件剖面示意圖。如圖7和圖8所示,在第一層間介電質204、第二層702、和第二層間介電質704進行化學機械研磨;並在第二層702的下端部分區域702b停止化學機械研磨。
圖9是本發明一實施例的半導體元件剖面示意圖。如圖8和圖9所示,可藉由濕式蝕刻或電漿蝕刻對第一層間介電質204和第一層202進行回蝕,以形成一對應於第一垂直結構110之源極112的隔離層902。在本實施例中,隔離層902會與源極112的頂部表面對齊,並與通道113相鄰。此方法可確保隔離層902在不同晶圓間仍有良好的厚度均勻性。
圖10是本發明一實施例的半導體元件剖面示意圖。如圖4和圖10所示,一高k介電層1002,功函數金屬(work function metal
WFM)層1004、1006,和一金屬閘極1008形成於第一垂直結構110上。圖10中的製程步驟也可適用於圖6或圖9。
圖11是本發明一實施例的半導體元件剖面示意圖。如圖10和圖11所示,對高k介電層1002的部分區域,功函數金屬(work function metal WFM)層1004、1006,和位於淺溝槽102之上並介於第一垂直結構110和第二垂直結構120之間的金屬閘極1008進行回蝕,並在隔離層402停止以作為底部之層間介電質。
圖12是本發明一實施例的半導體元件剖面示意圖。如圖12所示,先形成一具有底部層間介電質1202的基板1201。在基板1201上形成一具有第一層1212的垂直結構1210(類似圖11中的第一垂直結構110),第一層1212可能是例如一種金屬閘極。此外,一第一層間介電質1204(例如氧化物層)會形成於第一層1212和底部層間介電質1202之上。
圖13是本發明一實施例的半導體元件剖面示意圖。如圖13所示,在第一層間介電質1204進行化學機械研磨,並在第一層1212停止,以便提供良好的晶圓均勻性。
圖14是本發明一實施例的半導體元件剖面示意圖。如圖14所示,可藉由濕式蝕刻或電漿蝕刻對第一層間介電質1204進行回蝕,以形成一對應於第一垂直結構1210之通道1404的隔離層1402。在本實施例中,隔離層1402會與通道1404的頂部表面對齊,並與汲極1406相鄰。此方法可確保隔離層1402在不同晶圓間仍有良好的厚度均勻性。
圖15是本發明一實施例的半導體元件剖面示意圖。如圖12和圖15所示,在第一層間介電質1204進行化學機械研磨,直到距離第一垂直結構1210一預定厚度1502(例如約100-1000埃左右)時停止,一般而言,前述預定厚度1502是從第一垂直結構1210的汲極
1514到第一層1212間的距離。在第一層間介電質1204的預定厚度1502停止化學機械研磨可確保良好的晶圓厚度均勻性。
上述之化學機械研磨過程可能包括以下設定:拋光向下力為約0.5-5psi;平台速度約為每分鐘30-110轉(rpm);研磨液種類為二氧化矽(SiO2)、氧化鋁(Al2O3)、或二氧化鈰(CeO2)為底之研磨液;且研磨流量約為每分鐘50-500毫升(ml/min)。
圖16是本發明一實施例的半導體元件剖面示意圖。如圖15和圖16所示,可藉由濕式蝕刻或電漿蝕刻對第一層間介電質1204進行回蝕,以形成一對應於第一垂直結構1210之通道1604的隔離層1602。在本實施例中,隔離層1602會與通道1604的頂部表面對齊,並與汲極1606相鄰。此方法可確保隔離層1602在不同晶圓間仍有良好的厚度均勻性。
在某些實施例中,在利用濕式蝕刻或電漿蝕刻等方法回蝕第一層間介電質1204之前,會先以氣體團簇離子束對第一層間介電質1204進行回蝕。
上述之氣體團簇離子束回蝕過程可能包括以下參數:作用氣體包括如三氟化氮(NF3)、四氟化矽(SiF4)、三氟甲烷(CHF3)、或四氟化碳(CF4)等,載體氣體可以是氮(N2)或氦(He);團簇加速電壓為1KV-200KV;團簇劑量為每秒1013~1017平方公分;團簇流量為每分鐘100-5000標準立方厘米;壓力約10-3~10-8托;團簇數量為100~50000分子;團簇大小約為1~500納米。氣體團簇離子束在第一層間介電質1204的表面上所產生的等效能量約為每分子1~3電子伏特,表面溫度可達104K左右。氣體團簇離子束會加熱作用氣體而產生氟氣,並與表面反應形成四氟化矽(SiF4)和氧(O2、O)、一氧化氮(NO)、二氧化氮(NO2)、水(H2O)、一氧化碳(CO)、或二氧化碳(CO2)等揮發性氣體。
在某些實施例中,可選擇使用一後濕式清潔來減少進行氣體團簇離子束製程時所可能產生的缺陷,前述之濕式清潔製程可使用臭氧(O3)、稀釋的氫氟酸(HF)和氨(Amnonia NH3)等組合進行一至五次不等的清潔。
圖17是本發明一實施例的半導體元件剖面示意圖。如圖12和圖17所示,一個第二層1702會形成在第一層間介電質1204之上,一第二層間介電質1704會形成在第二層1702上。
一個三層氮氧化物(ONO)的三明治結構(氧化物/氮化物/氧化物)可用來形成第一層間介電質1204、第二層1702、及第二層間介電質1704,第一層間介電質1204可以由可流動的氧化物構成;第二層1702可以由氮化矽(SiN)、氮氧化矽(SiON)、碳化矽(SiC)、氮碳化矽(SiCN)、一氧化碳矽(SiCO)、或氮氧碳化矽(SiCON)等構成;第二層間介電質1704可以由電漿增強氧化物(PE oxide)構成。第二層1702的厚度大概約為5-300埃。第二層間介電質1704的厚度大概約為100-3000埃。
此外,第二層1702的上端部分區域1702a指的是第一垂直結構1210的突起部位;第二層1702的下端部分區域1702b指的是除了垂直突起部位以外的下方區域。一般情況下具有突起的部分僅佔整個晶圓面積的不到10%,因此第二層1702的部分區域1702a相較1702b而言更易受到化學拋光研磨過程的影響。
圖18是本發明一實施例的半導體元件剖面示意圖。如圖17和圖18所示,在第一層間介電質1204、第二層1702、和第二層間介電質1704進行化學機械研磨;並在第二層1702的下端部分區域1702b停止化學機械研磨。
圖19是本發明一實施例的半導體元件剖面示意圖。如圖18和圖19所示,可藉由濕式蝕刻或電漿蝕刻對第一層間介電質1204
進行回蝕,以形成一對應於第一垂直結構1210之通道1904的隔離層1902。在本實施例中,隔離層1902會與通道1904的頂部表面對齊,並與汲極1906相鄰。此方法可確保隔離層1902在不同晶圓間仍有良好的厚度均勻性。
圖20是本發明一實施例的半導體元件剖面示意圖。如圖14和圖20所示,一高k介電層2002的部分區域,功函數金屬層2004、2006,和包圍在垂直結構1210之汲極1406外的第一層1212會被蝕刻以便暴露汲極1406。圖20中的製程步驟也可適用於圖16或圖19。前述之汲極1406可包括一矽化物(silicide)2008。
圖21是本發明一實施例的半導體元件剖面示意圖。如圖21所示,先形成一具有中間層間介電質2102的基板2101。在基板2101上形成一具有第一層2112的垂直結構2110(類似圖20中的垂直結構1210),第一層2112可能是例如一種矽化物。此外,一第一層間介電質2104(例如氧化物層)會形成於第一層2112、垂直結構2110、和中間層間介電質2102之上。
圖22是本發明一實施例的半導體元件剖面示意圖。如圖22所示,在第一層間介電質2104進行化學機械研磨,並在第一層2112停止,此方法可確保隔離層2202在不同晶圓間仍有良好的厚度均勻性。
圖23是本發明一實施例的半導體元件剖面示意圖。如圖21和圖23所示,在第一層間介電質2104進行化學機械研磨,直到距離第一垂直結構2110一預定厚度2302(例如約100-1000埃左右)時停止,一般而言,前述預定厚度2302是從第一垂直結構2110的第一層2112開始。在第一層間介電質2104的預定厚度2302停止化學機械研磨的作法可確保良好的晶圓厚度均勻性。
上述之化學機械研磨過程可能包括以下設定:拋光向下
力為約0.5-5psi;平台速度約為每分鐘30-110轉(rpm);研磨液種類為膠狀二氧化矽(SiO2)、氧化鋁(Al2O3)、或二氧化鈰(CeO2)為底之研磨液;且研磨流量約為每分鐘50-500毫升(ml/min)。
圖24是本發明一實施例的半導體元件剖面示意圖。如圖23和圖24所示,可藉由濕式蝕刻或電漿蝕刻對第一層間介電質2104進行回蝕,以形成一對應於第一垂直結構2110之汲極2404的隔離層2402。此方法可確保隔離層2402在不同晶圓間仍有良好的厚度均勻性。前述之汲極2404可能包括由矽化物構成的第一層2112。
在某些實施例中,在利用濕式蝕刻或電漿蝕刻等方法回蝕第一層間介電質2104之前,會先以氣體團簇離子束對第一層間介電質2104進行回蝕。
上述之氣體團簇離子束回蝕過程可能包括以下參數:作用氣體包括如三氟化氮(NF3)、四氟化矽(SiF4)、三氟甲烷(CHF3)、或四氟化碳(CF4)等,載體氣體可以是氮(N2)或氦(He);團簇加速電壓為1KV-200KV;團簇劑量為每秒1013~1017平方公分;團簇流量為每分鐘100-5000標準立方厘米;壓力約10-3~10-8托;團簇數量為100~50000分子;團簇大小約為1~500納米。氣體團簇離子束在第一層間介電質2104的表面上所產生的等效能量約為每分子1~3電子伏特,表面溫度可達104K左右。氣體團簇離子束會加熱作用氣體而產生氟氣,並與表面反應形成四氟化矽(SiF4)和氧(O2、O)、一氧化氮(NO)、二氧化氮(NO2)、水(H2O)、一氧化碳(CO)、或二氧化碳(CO2)等揮發性氣體。
在某些實施例中,可選擇使用一後濕式清潔來減少進行氣體團簇離子束製程時所可能產生的缺陷,前述之濕式清潔製程可使用臭氧(O3)、稀釋的氫氟酸(HF)和氨(Amnonia NH3)等組合進行一至五次不等的清潔。
圖25是本發明一實施例的半導體元件剖面示意圖。如圖21和圖25所示,一個第二層2502會形成在第一層間介電質2104之上,一第二層間介電質2504會形成在第二層2502上。
一個三層氮氧化物(ONO)的三明治結構(氧化物/氮化物/氧化物)可用來形成第一層間介電質2104、第二層2502、及第二層間介電質2504,第一層間介電質2104可以由可流動的氧化物構成;第二層2502可以由氮化矽(SiN)、氮氧化矽(SiON)、碳化矽(SiC)、氮碳化矽(SiCN)、一氧化碳矽(SiCO)、或氮氧碳化矽(SiCON)等構成;第二層間介電質2504可以由電漿增強氧化物構成。第二層2502的厚度大概約為5-300埃。第二層間介電質2504的厚度大概約為100-3000埃。
此外,第二層2502的上端部分區域2502a指的是第一垂直結構2110的突起部位;第二層2502的下端部分區域2502b指的是除了垂直突起部位以外的下方區域。一般情況下具有突起的部分僅佔整個晶圓面積的不到10%,因此第二層2502的部分區域2502a相較2502b而言更易受到化學拋光研磨過程的影響。
圖26是本發明一實施例的半導體元件剖面示意圖。如圖25和圖26所示,在第一層間介電質2104、第二層2502、和第二層間介電質2504進行化學機械研磨;並在第二層2502的下端部分區域2502b停止化學機械研磨。
圖27是本發明一實施例的半導體元件剖面示意圖。如圖26和圖27所示,可藉由濕式蝕刻或電漿蝕刻對第一層間介電質2104進行回蝕,以形成一對應於第一垂直結構2110之汲極2704的隔離層2702。此方法可確保隔離層2702在不同晶圓間仍有良好的厚度均勻性。前述之汲極2704可能包括由矽化物構成的第一層2112。
圖28是一形成垂直結構方法2800的示意流程圖,如圖28所示,該方法2800包括以下步驟:提供基板(2802);提供一垂直
結構,其基板上具有一第一層(2804);在第一層上提供第一層間介電質(2806);在第一層間介電質進行化學機械研磨(2808);回蝕第一層間介電質和第一層,以形成一對應於垂直結構之源極的隔離層(2810)。
上述的操作步驟2804還包括提供一垂直結構,該結構具有一由氮化矽構成的第一層,其並可作為基板上的蝕刻停止層,前述之方法2800還包括在第一層上停止化學機械研磨,以及在第一層間介電質中距離垂直結構上方的一個預定厚度停止化學機械研磨。操作步驟2804還包括藉由濕式蝕刻或電漿蝕刻對第一層間介電質和第一層進行回蝕。方法2800還包括以氣體團簇離子束對第一層間介電質和第一層進行回蝕。前述之方法2800更進一步包括:在第一層間介電質之上形成一第二層;在第二層上形成一第二層間介電質;在第一層間介電質、第二層、和第二層間介電質進行化學機械研磨;並在第二層的下端區域停止化學機械研磨。
圖29是一形成垂直結構方法2900的示意流程圖。如圖29所示,該方法2900包括以下步驟:提供一具有底部層間介電質的基板(2902);提供一垂直結構,其基板上具有一第一層(2904);在第一層和底部層間介電質上提供一第一層間介電質(2906);在第一層間介電質進行化學機械研磨(2908);回蝕前述第一層間介電質,以形成一對應於垂直結構之通道的隔離層(2910)。
上述的操作步驟2904還包括提供一垂直結構,該結構具有一由金屬閘極構成的第一層,其並可作為基板上的蝕刻停止層,前述之方法2900還包括在第一層上停止化學機械研磨,以及在第一層間介電質中距離垂直結構上方的一個預定厚度停止化學機械研磨。操作步驟2910包括藉由濕式蝕刻或電漿蝕刻對第一層間介電質進行回蝕。方法2900包括以氣體團簇離子束對第一層間介電質和第一層進行回蝕。前述之方法2900更進一步包括:在第一層間介電質之上形成一
第二層;在第二層上形成一第二層間介電質;在第一層間介電質、第二層、和第二層間介電質進行化學機械研磨;並在第二層的下端區域停止化學機械研磨。
圖30是一形成垂直結構方法3000的示意流程圖。如圖30所示,該方法3000包括以下步驟:提供一具有中間層間介電質的基板(3002);提供一垂直結構,其基板上具有一第一層(3004);在第一層和中間層間介電質上提供一第一層間介電質(3006);在第一層間介電質進行化學機械研磨(3008);回蝕前述第一層間介電質,以形成一對應於垂直結構之汲極的隔離層(3010)。
上述的操作步驟3004還包括提供一垂直結構,該結構具有一由矽化物構成的第一層,其並可作為基板上的蝕刻停止層,前述之方法3000還包括在第一層上停止化學機械研磨,以及在第一層間介電質中距離垂直結構上方的一個預定厚度停止化學機械研磨。操作步驟3010包括藉由濕式蝕刻或電漿蝕刻對第一層間介電質進行回蝕。方法3000包括以氣體團簇離子束對第一層間介電質和第一層進行回蝕。前述之方法3000更進一步包括:在第一層間介電質之上形成一第二層;在第二層上形成一第二層間介電質;在第一層間介電質、第二層、和第二層間介電質進行化學機械研磨;並在第二層的下端區域停止化學機械研磨。
根據一個示範性實施例,此處提供一形成隔離層的方法。該方法包括以下步驟:提供基板;提供一垂直結構,其基板上具有一第一層;在第一層上提供第一層間介電質;在第一層間介電質進行化學機械研磨;回蝕第一層間介電質和第一層,以形成一對應於垂直結構之源極的隔離層。
根據一個示範性實施例,此處提供一形成隔離層的方法。該方法包括以下步驟:提供一具有底部層間介電質的基板;提供
一垂直結構,其基板上具有一第一層;在第一層和底部層間介電質上提供一第一層間介電質;在第一層間介電質進行化學機械研磨;回蝕前述第一層間介電質,以形成一對應於垂直結構之通道的隔離層。
根據一個示範性實施例,此處提供一形成隔離層的方法。該方法包括以下步驟:提供一具有中間層間介電質的基板;提供一垂直結構,其基板上具有一第一層;在第一層和中間層間介電質上提供一第一層間介電質;在第一層間介電質進行化學機械研磨;回蝕前述第一層間介電質,以形成一對應於垂直結構之汲極的隔離層。
本發明雖以各種實施例揭露如上,然其並非用以限定本發明的範圍,任何所屬技術領域中具有通常知識者,在不脫離本發明之精神和範圍內,當可作些許的更動與潤飾,因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。
Claims (10)
- 一種形成一隔離層的方法,其包括以下步驟:提供一基板;提供一垂直結構,該垂直結構具有一場效電晶體以及一第一層在基板之上,該場效電晶體包括一源極、一通道和一汲極,且該通道在該源極之上,以及該汲極在該通道之上;在該第一層上提供一第一層間介電質;在該第一層間介電質進行化學機械研磨(CMP);和回蝕該第一層間介電質和該第一層,暴露該場效電晶體之該通道,以形成對應於該垂直結構之該源極之該隔離層。
- 如申請專利範圍第1項中所述之方法,其中提供該垂直結構,該垂直結構具有該第一層在基板之上之提供步驟包括提供該垂直結構,該垂直結構具有由氮化矽(SiN)構成的該第一層以作為該基板之上的一蝕刻停止層。
- 如申請專利範圍第1項中所述之方法,更包括在距離該垂直結構上方的該第一層間介電質的一預定厚度停止該化學機械研磨。
- 如申請專利範圍第3項中所述之方法,其中回蝕該第一層間介電質和該第一層,暴露該場效電晶體之該通道,以形成對應於該垂直結構之該源極之該隔離層的步驟,更包括藉由濕式蝕刻(wet etching)、電漿蝕刻(plasma etching)或以氣體團簇離子束(gas cluster ion beams)對該第一層間介電質和該第一層進行回蝕。
- 一種形成一隔離層的方法,其包括以下步驟:提供具有一底部層間介電質之一基板;提供一垂直結構,該垂直結構具有一場效電晶體以及一第一層於該基板之上,該場效電晶體包括一源極、一通道和一汲極,且該通道在該源極之上,以及該汲極在該通道之上;在該第一層和該底部層間介電質上提供一第一層間介電質;在該第一層間介電質進行化學機械研磨;和回蝕該第一層間介電質,以形成對應於該垂直結構之該通道的該隔離層。
- 如申請專利範圍第5項中所述之方法,其中提供該垂直結構,該垂直結構具有該第一層於該基板之上提供之步驟,更包括提供該垂直結構,該垂直結構具有由金屬閘極構成的該第一層,以作為該基板之上的一蝕刻停止層。
- 如申請專利範圍第5項中所述之方法,更包括:在該第一層間介電質上提供一第二層;在該第二層上提供一第二層間介電質;針對該第一層間介電質、該第二層、和該第二層間介電質進行化學機械研磨;和在該第二層的一下端區域停止該化學機械研磨。
- 一種形成隔離層的方法,其包括以下步驟:提供具有一中間層間介電質之一基板;提供一垂直結構,該垂直結構具有一場效電晶體以及一第一層於該基板之上,該場效電晶體包括一源極、一通道和一汲極,且該通道在該源極之上,以及該汲極在該通道之上;在該第一層和該中間層間介電質上提供一第一層間介電質;在該第一層間介電質進行化學機械研磨;和回蝕該第一層間介電質,以形成對應於該垂直結構之該汲極的該隔離層。
- 如申請專利範圍第8項中所述之方法,其中提供該垂直結構,該垂直結構具有該第一層於該基板之上提供之步驟,更包括提供該垂直結構,該垂直結構具有由矽化物(silicide)構成的該第一層,並可作為該基板上的一蝕刻停止層。
- 如申請專利範圍第8項中所述之方法,更包括在距離該垂直結構上方的該第一層間介電質的一預定厚度停止該化學機械研磨。
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