TWI601204B - 自由基成分的氧化物蝕刻 - Google Patents
自由基成分的氧化物蝕刻 Download PDFInfo
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- TWI601204B TWI601204B TW102132456A TW102132456A TWI601204B TW I601204 B TWI601204 B TW I601204B TW 102132456 A TW102132456 A TW 102132456A TW 102132456 A TW102132456 A TW 102132456A TW I601204 B TWI601204 B TW I601204B
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- 239000000758 substrate Substances 0.000 claims description 121
- 238000000034 method Methods 0.000 claims description 94
- 238000012545 processing Methods 0.000 claims description 88
- 239000002243 precursor Substances 0.000 claims description 62
- 229910052731 fluorine Inorganic materials 0.000 claims description 41
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 40
- 239000011737 fluorine Substances 0.000 claims description 40
- 238000005530 etching Methods 0.000 claims description 38
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- 239000001257 hydrogen Substances 0.000 claims description 26
- 229910052739 hydrogen Inorganic materials 0.000 claims description 26
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 24
- 229910021529 ammonia Inorganic materials 0.000 claims description 20
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical group O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical group [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 claims description 14
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- SPPCMVNDPDQNRG-UHFFFAOYSA-L [F-].[F-].[Sb++] Chemical compound [F-].[F-].[Sb++] SPPCMVNDPDQNRG-UHFFFAOYSA-L 0.000 claims description 2
- 229910001882 dioxygen Inorganic materials 0.000 claims description 2
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 2
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- 239000001272 nitrous oxide Substances 0.000 claims description 2
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 2
- 125000001153 fluoro group Chemical group F* 0.000 claims 1
- 230000008569 process Effects 0.000 description 56
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- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 7
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- 229910052715 tantalum Inorganic materials 0.000 description 6
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- 239000012159 carrier gas Substances 0.000 description 4
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- 239000003989 dielectric material Substances 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 4
- 229910052707 ruthenium Inorganic materials 0.000 description 4
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- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 3
- 238000001020 plasma etching Methods 0.000 description 3
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- 229910001936 tantalum oxide Inorganic materials 0.000 description 3
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 3
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000000231 atomic layer deposition Methods 0.000 description 2
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- 230000005281 excited state Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011796 hollow space material Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
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- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 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
- 125000004429 atom Chemical group 0.000 description 1
- 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 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
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- 125000004122 cyclic group Chemical group 0.000 description 1
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- 230000005593 dissociations Effects 0.000 description 1
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- 230000009969 flowable effect Effects 0.000 description 1
- -1 fluoride ions Chemical class 0.000 description 1
- 239000003574 free electron Substances 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
- 229910000449 hafnium oxide Inorganic materials 0.000 description 1
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
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- 239000012212 insulator Substances 0.000 description 1
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- 238000002955 isolation Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 150000002835 noble gases Chemical class 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 238000010926 purge 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
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- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 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
- H01L21/31—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32357—Generation remote from the workpiece, e.g. down-stream
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- Analytical Chemistry (AREA)
- Drying Of Semiconductors (AREA)
Description
本申請案主張美國臨時專利申請案第61/702,493號之權益,該申請案於2012年9月18日提出申請,發明名稱為「RADICAL-COMPONENT OXIDE ETCH」,該申請案為所有目的在此全文以參考形式併入。
本發明係關於自由基成分的氧化物蝕刻。
積體電路係藉由在基材表面上生產錯綜複雜地圖案化材料層的製程而製作。在基材上生產圖案化材料需要有用於移除暴露材料之受控制的方法。化學蝕刻係用於各種目的,該等目的包括將光阻中的圖案轉移到下伏層中、薄化層或薄化已呈現於表面上的特徵結構的側向尺度。通常期望具有蝕刻一種材料比另一種快的蝕刻製程,以助於例如圖案轉移製程進行。此類蝕刻製程係稱為對第一材料具選擇性。材料、電路與製程多樣性的結果,蝕刻製程已朝多種材料之選擇性發展。
濕式氫氟酸蝕刻(wet HF etch)比其他介電質與半導
體優先移除氧化矽。然而,濕式製程無法滲透某些受限制的溝槽,且有時使殘餘材料變形。在原地(local)電漿(基材處理區域內之電漿)中產生的乾式蝕刻可以滲透更多受限制的溝槽,並使細微殘餘結構呈現更少變形。然而,原地電漿在放電時會透過電弧產生而損壞基材。
SiconiTM蝕刻係遠端電漿輔助之乾式蝕刻製程,該製程涉及同時暴露基材至H2、NF3與NH3電漿副產物。氫和氟物種的遠端電漿激發容許無電漿損壞的基材處理。SiconiTM蝕刻對氧化矽層具大量共形與選擇性,但不易蝕刻矽,無論該矽係非晶形、結晶、或多晶形。氮化矽通常係在矽與氧化矽之間的速率下蝕刻,但是氧化矽相較於氮化矽的選擇性通常並非如氧化矽相較於矽的選擇性般顯著。該選擇性在諸如淺溝槽隔離(STI)與層間介電質(ILD)凹部形成之應用上提供許多優點。SiconiTM製程產生固體副產物,當基材材料被移除時,該些固體副產物在基材的表面上生長。當基材的溫度升高時,該些固體副產物後續透過昇華而被移除。由於固體副產物之產生的結果,SiconiTM蝕刻製程也會使細微殘餘結構變形。
由於副產物的形成可能在圖案化基材上擾亂細微結構,因此需要多種方法以選擇性地移除氧化矽同時不會在基材表面上形成固體副產物。
描述一種在圖案化異質結構上蝕刻暴露的氧化矽之方法,且該方法包括從含氟前驅物所形成的遠端電漿蝕刻。
來自該遠端電漿的電漿流出物係流進基材處理區域,在該基材處理區域中該電漿流出物與含氮和氫前驅物組合。在該基材於相較於典型的SiconiTM製程為高溫時,從而產生的反應物以高氧化矽選擇性蝕刻該圖案化異質結構。該蝕刻進行,而不會在該基材表面上產生殘餘物。該方法可用以在移除極少量或不移除矽、多晶矽、氮化矽或氮化鈦的同時移除氧化矽。
本發明之實施例包括在基材處理腔室之基材處理區域中蝕刻圖案化基材之方法。該圖案化基材具有暴露的氧化矽區域。該方法包括使含氟前驅物流進遠端電漿區域,同時在該遠端電漿區域中形成遠端電漿以產生電漿流出物,該遠端電漿區域流通式耦接(fluidly coupled)至該基材處理區域。該方法進一步包括使含氮和氫前驅物流進該基材處理區域中,毋先使該含氮和氫前驅物通過該遠端電漿區域。該方法進一步包括在該基材處理區域中,以該等電漿流出物及該含氮和氫前驅物的組合蝕刻該暴露的氧化矽區域。
額外的實施例與特徵在此部分地描述在以下說明中,且部分地對於此技術領域中具有通常知識者而言在參閱說明書後能清楚明瞭,或可藉由實施所揭露的實施例而瞭解。可藉由說明書中所描述的手段、組合和方法來瞭解並獲得該所揭露的實施例之特徵及優點。
110-145‧‧‧處理步驟
1001‧‧‧處理腔室
1010‧‧‧遠端電漿系統
1011‧‧‧氣體入口組件
1012‧‧‧第一通道
1013‧‧‧第二通道
1020‧‧‧腔室電漿區域
1021‧‧‧蓋
1024‧‧‧絕緣環
1026‧‧‧長度
1050‧‧‧直徑
1051‧‧‧中空空間
1053‧‧‧多孔隔板
1055‧‧‧小孔洞
1056‧‧‧通孔
1070‧‧‧基材處理區域
1101‧‧‧處理系統
1102‧‧‧FOUP
1104、1110‧‧‧機械手臂
1106‧‧‧固持區域
1108a-f‧‧‧處理腔室
1155‧‧‧氣體操縱系統
1157‧‧‧系統控制器
欲進一步了解該所揭露的實施例之本質及優點可藉由參考說明書之其餘部分和圖式而實現。
第1圖係根據所揭露的實施例之氧化矽選擇性蝕刻
製程的流程圖。
第2A圖係顯示根據本發明之實施例的基材處理腔室。
第2B圖係顯示根據本發明之實施例的基材處理腔室的噴淋頭(showerhead)。
第3圖係顯示根據本發明之實施例的基材處理系統。
在所附圖示中,相似的部件及/或特徵可具有相同的元件符號。另外,相同類型的各種部件可藉由以下方式區別:將虛線和第二符號接在該元件符號之後,該第二符號用於區別該等類似的部件。如果說明書中僅使用第一元件符號,則該說明係適用於具有相同第一元件符號之相似部件的任一者,無關於第二元件符號為何。
描述一種在圖案化異質結構上蝕刻暴露的氧化矽之方法,且該方法包括從含氟前驅物所形成的遠端電漿蝕刻。來自該遠端電漿的電漿流出物係流進基材處理區域,在該基材處理區域中該電漿流出物與含氮和氫前驅物組合。在該基材於相較於典型的SiconiTM製程為高溫時,從而產生的反應物以高氧化矽選擇性蝕刻該圖案化異質結構。該蝕刻進行而不會在該基材表面上產生殘餘物。該方法可用以在移除少量或不移除矽、多晶矽、氮化矽或氮化鈦的同時移除氧化矽。
選擇性遠端氣相蝕刻製程已使用氨(NH3)之氫源與三氟化氮(NF3)之氟源,該氫源與氟源一起流過遠端電漿系統
(RPS)且進入反應區域。氨與三氟化氮的流速通常係經選擇以使得氫的原子流速大致上是氟的原子流速的兩倍,以為了有效地利用這兩種製程氣體組份。氫與氟的存在使得(NH4)2SiF6之固體副產物得以在相對低的基材溫度下形成。該固體副產物係藉由將基材之溫度升高至昇華溫度之上而移除。遠端氣相蝕刻製程移除氧化物膜比移除例如矽快得多。但是,傳統的選擇性遠端氣相蝕刻製程相較於氮化矽的選擇性可能不佳。本案發明人已經發現,氧化矽相較於氮化矽的選擇性可藉由以下方式強化:在遠端電漿中激發含氟前驅物,並將電漿流出物與氨結合,該氨並未穿過遠端電漿系統。
為了較佳瞭解與認識本發明,現在參考第1圖,第1圖係根據所揭露的實施例之氧化矽選擇性蝕刻製程的流程圖。在第一操作之前,使基材圖案化留下氧化矽之暴露區域與氮化矽之暴露區域。接著使該圖案化基材遞送至基材處理區域中(操作110)。啟動三氟化氮流進入與處理區域分開的電漿區域(操作120)。可使用其他氟源以增大或置換三氟化氮。一般而言,含氟前驅物係流進電漿區域,且該含氟前驅物包含至少一種選自由下列所組成之群組的前驅物:原子氟、雙原子氟、三氟化氮、四氟化碳、氟化氫及二氟化氙。該分開的電漿區域在此可稱為遠端電漿區域,且可位在與處理腔室分開的模組內或是位在處理腔室內的隔間內。在遠端電漿區域中形成的電漿流出物隨後係流進基材處理區域(操作125)。在此時,氣相蝕刻對氧化矽具有極少的選擇性且具有受限制的可利用性。然而,同時將氨流進基材處理區域(操作130)以
與該電漿流出物反應。該氨係不穿過遠端電漿區域,且因此僅透過與該電漿流出物的交互作用而受到激發。
圖案化基材係經選擇性蝕刻(操作135),使得在比氮化矽顯著高的速率下移除氧化矽。將反應性化學物種從基材處理區域移除,然後從該處理區域移除基材(操作145)。使用在此描述的氣相乾式蝕刻製程,本案發明人已確定,具有超過100:1多達150:1之選擇性(SiO蝕刻速率:SiN蝕刻速率)是可能的。使用在此描述的方法可實現的選擇性係先前技術方法的至少四倍大。在本發明之實施例中,氧化矽的蝕刻速率係超過氮化矽的蝕刻速率約40或更多、約50或更多、約75或更多、或約100或更多的乘數因子(multiplicative factor)。
亦已發現在此描述的氣相乾式蝕刻能增加氧化矽相對於矽(包括多晶矽)的蝕刻選擇性。使用在此描述的氣相乾式蝕刻製程,本案發明人已確定具有超過100:1多達500:1之選擇性(SiO蝕刻速率:Si蝕刻速率)是可能的。使用在此描述的方法可實現的選擇性係先前技術方法的至少五倍大。在本發明之實施例中,氧化矽的蝕刻速率係超過矽的蝕刻速率約100或更多、約150或更多、約200或更多、或約300或更多的乘數因子。
僅涉及氟(遠端或原地)的氣相蝕刻不具有移除氧化矽同時保留圖案化基材(例如由矽或氮化矽製成)的其他部分幾乎不受擾亂所需的選擇性。在此描述的氣相蝕刻具有額外的效益,因為他們不產生固體殘餘物。消除固體殘餘物會避
免擾亂某些可能由犧牲性氧化矽所支撐的精細特徵。固體殘餘物的消除亦藉由移除昇華步驟而簡化製程流程且降低處理成本。在本發明之實施例中,含氟前驅物係不含氫。當遠端電漿區域中不包括氫前驅物時,電漿流出物亦不含氫。這確保在圖案化基材上固體副產物僅以極微量產生。
不希望將申請專利範圍的涵蓋範圍設限在理論機制,該機制可能完全正確或可能不完全正確,可能的機制的某些討論可證實是有利的。自由基-氟前驅物係藉由使含氟前驅物遞送至遠端電漿區域所產生。申請人假設產生一濃度的氟離子與原子並遞送至基材處理區域。氨(NH3)可與氟反應以產生較低反應性的物種,諸如HF2 -,該物種仍易於從圖案化基材表面移除氧化矽但不易移除矽與氮化矽。該選擇性結合無固體副產物,使得該等蝕刻製程良好地適於從精細的非氧化矽材料移除外模以及其他氧化矽支撐結構,同時在殘餘細微結構中誘導極少量變形。
一般來說,含氮和氫前驅物可用於取代氨。含氮和氫前驅物可僅由氮和氫(諸如上述實例中使用的氨(NH3))所組成。所揭露的實施例中,含氮和氫前驅物可以是肼(N2H4)。
在所揭露的實施例中,在蝕刻操作期間,於基材處理區域中的壓力可高於或約0.1托耳(Torr)且少於或約50托耳。在所揭露的實施例中,於基材處理區域內的壓力亦可低於或約40托耳且高於或約5托耳或10托耳。任一上限可與任一彼等下限結合以形成本發明之額外的實施例。在所揭
露的實施例中,在蝕刻操作期間,圖案化基材的溫度可為約10℃或更高且約250℃或更低的溫度。在本發明之實施例中,在蝕刻操作期間,圖案化基材的溫度可為約100℃或更高且約140℃或更低的溫度。
在蝕刻操作期間,除了含氟前驅物外,含氧前驅物也可被遞送至遠端電漿區域。本案發明人已發現,添加含氧前驅物放寬製程裕度(process window),同時維持上文概述之選擇性效益。壓力係可透過含氧前驅物的添加而更廣泛變化的製程參數。當蝕刻操作期間將含氧前驅物加入遠端電漿區域時,可能有更寬的壓力範圍(同時維持均勻的選擇性蝕刻製程)。含氧前驅物例如可以是分子氧(O2)、一氧化二氮(N2O)或二氧化氮(NO2),然而也可使用其他的含氧前驅物。
額外的氧化矽選擇性蝕刻製程參數係揭露於描述例示性處理腔室和系統過程中。
可實施本發明之實施例的處理腔室可被包括在處理平台內,該等處理平台諸如可購自美國加州聖克拉拉市(Santa Clara,Calif)的應用材料公司的CENTURA®及PRODUCER®系統。可與本發明之例示性方法一併使用的基材處理腔室的實例,可包括顯示於及描述於共同讓渡給Lubomirsky等人的美國臨時專利申請案第60/803,499號中的該等腔室,該案於2006年5月30日提出申請,且發明名稱為「PROCESS CHAMBER FOR DIELECTRIC GAPFILL」,該案為所有目的在此將全文內容以參考形式併入。額外的例示性系統可包括顯
示於及描述於美國專利第6,387,207號與第6,830,624號中的該等系統,該等專利亦為所有目的在此以參考形式併入。
第2A圖係根據所揭露的實施例之基材處理腔室1001。遠端電漿系統(RPS1010)可處理含氟前驅物,隨後該含氟前驅物行進穿過氣體入口組件1011。在氣體入口組件1011內可見兩個截然不同的氣體供應通道。第一通道1012載送氣體穿過遠端電漿系統RPS1010,而第二通道1013繞過RPS1010。在實施例中,任一通道皆可用於含氟前驅物。另一方面,第一通道1012可用於製程氣體,而第二通道1013可用於處理氣體。蓋1021(例如,導電的頂部部分)以及多孔(perforated)隔板(噴淋頭1053)之間係顯示具有絕緣環1024,該絕緣環使得AC電位得以相對於噴淋頭1053而施加到蓋1021。AC電位在腔室電漿區域1020中點燃電漿。製程氣體可行進穿過第一通道1012進入腔室電漿區域1020,且可在單獨腔室電漿區域1020中(或者,在腔室電漿區域1020中連同在RPS1010中)由電漿激發。如果製程氣體(含氟前驅物)流過第二通道1013,隨後僅腔室電漿區域1020被用於激發。腔室電漿區域1020及/或RPS1010的結合在此可被稱為遠端電漿系統。多孔隔板(亦稱為噴淋頭)1053使噴淋頭1053下方的基材處理區域1070與腔室電漿區域1020間隔開。噴淋頭1053使得電漿存在於腔室電漿區域1020中,以避免於基材處理區域1070中直接激發氣體,同時仍使得受激發的物種從腔室電漿區域1020行進至基材處理區域1070。
噴淋頭1053係位於腔室電漿區域1020與基材處理
區域1070之間,且使得電漿流出物(前驅物或其他氣體之受激發的衍生物)在RPS1010及/或腔室電漿區域1020內生成,以穿過複數個橫切板厚的通孔1056。噴淋頭1053亦具有一個或多個中空空間1051,該中空空間可被呈蒸氣或氣態之形式的前驅物(諸如含矽前驅物)填滿,並且穿過小孔洞1055進入基材處理區域1070,但不直接進入腔室電漿區域1020。在此所揭露的實施例中,噴淋頭1053係比通孔1056的最小直徑1050的長度還厚。為了維持從腔室電漿區域1020穿透至基材處理區域1070之受激發的物種的顯著濃度,透過形成通孔1056之較大的直徑部分且使該較大的直徑部分僅穿過噴淋頭1053的一部分(part way),而可限制通孔之最小直徑1050的長度1026。在所揭露的實施例中,通孔1056之最小直徑1050的長度可與通孔1056的最小直徑為相同量級,或者為較小的量級。
在所示的實施例中,一旦製程氣體受到腔室電漿區域1020中的電漿激發,噴淋頭1053可(透過通孔1056)分配製程氣體,該等製程氣體含有氧、氫及/或氮、及/或該等製程氣體的電漿流出物。在實施例中,透過第一通道1012導入RPS 1010中及/或腔室電漿區域1020中的製程氣體可以包括氟(例如CF4、NF3或XeF2)。製程氣體亦可包括載氣,諸如氦氣、氬氣、氮氣(N2)等。電漿流出物可包括製程氣體的離子化或中性的衍生物,且在此亦可稱為自由基-氟前驅物,該自由基-氟前驅物是指被導入的製程氣體之原子組份。
在實施例中,通孔1056的數量可以介於約60個至
約2000個之間。通孔1056可具有多種的形狀,但最容易製成圓形。在所揭露的實施例中,通孔1056的最小直徑1050可以介於約0.5毫米(mm)至約20mm之間,或介於約1mm至約6mm之間。在選擇通孔的截面形狀時,亦有範圍,通孔的截面形狀可被製成錐形、圓柱形或該二種形狀的組合。在不同的實施例中,用於將氣體導進基材處理區域1070的小孔洞1055的數量可以介於約100個至約5000個之間,或介於約500個至約2000個之間。小孔洞1055的直徑可以介於約0.1mm至約2mm之間。
第2B圖係根據所揭露的實施例與處理腔室一併使用的噴淋頭1053的底視圖。噴淋頭1053係對應第2A圖中所示的噴淋頭。通孔1056係被繪成在噴淋頭1053之底部上具有較大的內徑(ID),而在頂部處具有較小的ID。小孔洞1055係實質上在噴淋頭之表面上均勻分佈,甚至分佈在通孔1056之間,相較於在此描述的其他實施例,這種分佈助於提供更均勻的混合。
當穿過噴淋頭1053中的通孔1056而抵達的含氟電漿流出物與源自中空空間1051穿過小孔洞1055而抵達的氨結合時,例示性圖案化的基材可在基材處理區域1070內由底座(未圖示)支撐。在本發明之實施例中,儘管可將基材處理區域1070裝配成支撐用於諸如固化之其他製程的電漿,然而在蝕刻圖案化的基材期間係無電漿存在。
電漿既可在噴淋頭1053上方的腔室電漿區域1020中點燃,亦可在噴淋頭1053下方的基材處理區域1070點燃。
電漿係存在於腔室電漿區域1020中,以從含氟前驅物的流入中產生自由基-氟前驅物。在處理腔室之導電頂部部分1021與噴淋頭1053之間施加通常在射頻(RF)範圍的AC電壓,以在沉積期間在腔室電漿區域1020中點燃電漿。RF功率供應器產生13.56MHz的高RF頻率,但亦可產生單獨其他的頻率或者與13.56MHz頻率結合的頻率。
當開啟基材處理區域1070中的底部電漿以固化膜或清潔接壤基材處理區域1070的內部表面時,頂部電漿可處於低功率或無功率。基材處理區域1070中的電漿係經由在噴淋頭1053與底座(或腔室之底部)之間施加AC電壓而點燃。清潔氣體可在電漿存在同時被導入基材處理區域1070。
底座可具有熱交換通道,熱交換流體流過該熱交換通道以控制基材的溫度。此配置使得基材溫度得以冷卻或加熱,以維持相對低的溫度(從室溫直到約120℃)。熱交換流體可包含乙二醇和水。底座的晶圓支撐淺盤(較佳為鋁、陶瓷或前述材料之組合)亦可被電阻式加熱以達成相對高的溫度(從約120℃直到約1100℃),此加熱是使用嵌入單迴圈之嵌入式加熱器元件,該元件經配置以造成平行的同心圓形式的兩個完整迴轉。加熱器元件的外部可繞於鄰接支撐淺盤的周邊處,同時內部繞於具有較小半徑的同心圓的路徑上。接至加熱器元件的配線係穿過底座的心柱。
基材處理系統係受系統控制器控制。在一例示性實施例中,系統控制器包括硬碟機、軟碟機及處理器。處理器含有單板電腦(SBC)、類比數位輸入/輸出板、介面板及步進馬
達控制板。CVD系統的各部件皆符合Versa Modular European(VME)標準,該標準係界定電路板、卡片機架(card cage)、以及連結器規格與類型。VME標準亦界定匯流排結構為具有16位元資料匯流排或24位元位址匯流排。
系統控制器係控制所有蝕刻腔室的活動。系統控制器執行系統控制軟體,該軟體係儲存在電腦可讀媒體中的電腦程式。媒體較佳係硬碟,但該媒體也可以是其他種類的記憶體。電腦程式包括指令集,該等指令集指示時間、氣體之混合、腔室壓力、腔室溫度、RF功率層級、基座(susceptor)位置及特殊製程的其他參數。儲存在其他記憶體裝置(包括,例如軟碟或其他另一適合的驅動器)上的其他電腦程式亦可用於指示系統控制器。
可使用經由系統控制器執行的電腦程式產品實施用於在基材上沉積膜堆疊的製程或者用於清潔腔室的製程。電腦程式編碼可以習知的電腦可讀的程式語言來撰寫,例如68000組語、C、C++、Pascal、Fortran或其他的程式語言。使用習知的文件編輯器將適合的程式編碼編入單一檔案或多重檔案,並且儲存於電腦可使用的媒體(如電腦的記憶體系統)或由該媒體實施。如果編入的編碼內文係高階語言,則編譯編碼,且所得的編譯編碼隨後與預先編譯的Microsoft Windows®程式館常式之目的碼連結。為了執行該連結、編譯的目的碼,系統使用者援用該目的碼,使電腦系統載入記憶體中的編碼。CPU隨後讀取並且執行該編碼,以操作程式中辨識的任務。
使用者與控制器之間的介面可透過平板接觸感應顯示器。在較佳的實施例中,使用兩個顯示器,一個安裝在無塵室壁以供操作者使用,而另一個在該壁後以供維修技術人員使用。該兩個顯示器可同時顯示相同的資訊,該實例中,一次僅有一個接受輸入。為了選擇特殊的螢幕或功能,操作者係接觸該接觸感應顯示器之指定的區域。接觸區域改變該區域的強調色彩,或呈現新的選單或螢幕,以確認操作者和接觸感應顯示器之間的溝通。可使用其他裝置,例如鍵盤、滑鼠或其他指示或溝通裝置來取代接觸感應顯示器,或者是除了接觸感應顯示器之外,可使用其他裝置,例如鍵盤、滑鼠或其他指示或溝通裝置,以讓使用者與系統控制器溝通。
腔室電漿區域或RPS中的區域可稱為遠端電漿區域。在一些實施例中,自由基前驅物(例如自由基-氟前驅物)係在遠端電漿區域中生成並且行進至基材處理區域中以與氨結合。在一些實施例中,氨僅經由自由基-氟前驅物激發。在一些實施例中,電漿功率基本上可僅被施加至遠端電漿區域,以確保自由基-氟前驅物對氨提供主要的激發。
在利用腔室電漿區域的實施例中,被激發的電漿流出物係在與沉積區域分隔的基材處理區域的區段中生成。該沉積區域(亦已知在此稱為基材處理區域)係電漿流出物與氨混合並反應以蝕刻圖案化基材(例如半導體晶圓)之處。受激發的電漿流出物亦可伴隨惰氣(在該例示性實例中,該惰氣為氬氣)。在一些實施例中,氨在進入基材電漿區域之前不穿過電漿。在此可將基材處理區域描述為在蝕刻圖案化基材期間為
「無電漿」。「無電漿」不必然意味著該區域缺乏電漿。在電漿區域內生成的離子化物種與自由電子確實行進穿過隔件(噴淋頭)中的孔洞(口孔),但氨並不實質上被施加至電漿區域的電漿功率所激發。腔室電漿區域中之電漿的邊界係難以界定的,且可能透過噴淋頭中的口孔侵入基材處理區域上。在感應耦合電漿的實例中,可直接在基材處理區域內執行少量的離子化。再者,低強度的電漿可在基材處理區域中生成,而不至於消滅形成的膜的期望特徵。在激發的電漿流出物之生成期間,電漿的強度離子密度遠比腔室電漿區域的強度離子密度低(就此而言,或者是遠比遠端電漿區域的強度離子密度低)的所有原因係不背離在此所用的「無電漿」之範疇。
三氟化氮(或另一含氟前驅物)可以一速率流進腔室電漿區域1020,該速率在所揭露的一些實施例中係約25sccm至約200sccm之間、約50sccm至約150sccm之間或約75sccm至約125sccm之間。氨可以一速率流進基材處理區域1070,該速率在所揭露的一些實施例中係約25sccm至約200sccm之間、約50sccm至約150sccm之間或約75sccm至約125sccm之間。視情況任選的含氧前驅物可以一速率流進腔室電漿區域1020,該速率在本發明之一些實施例中係約15sccm至約200sccm之間、約25sccm至約150sccm之間或約50sccm至約125sccm之間。
氨與含氟前驅物進入腔室的結合流速可佔總氣體混合物的體積的0.05%至約20%;殘餘的部分是載氣。在一些實施例中,含氟前驅物係流進遠端電漿區域,但電漿流出物具
有相同的體積流量比率。在含氟前驅物的實例中,可在那些含氟氣體之前先啟動淨化氣體或載氣進入遠端電漿區域,以穩定遠端電漿區域內的壓力。
電漿功率可以是各種頻率或多重頻率的組合。在例示性處理系統中,由相對噴淋頭1053遞送至蓋1021的RF功率提供電漿。在不同實施例中,RF功率可為約10W至約2000W之間、約100W至約2000W之間,約200W至約1500W之間或約500W至約1000W之間。在例示性處理系統中所施加的RF頻率在不同實施例中可以是低於約200kHz的低RF頻率、約10MHz至約15MHz之間的高RF頻率、或大於1GHz或約1GHz的微波頻率。可將電漿功率電容式耦合(CCP)或感應式耦合(ICP)至遠端電漿區域中。
在將氨、任何載氣與電漿流出物流進基材處理區域1070期間,基材處理區域1070可被維持在各種壓力下。該壓力在所揭露的實施例中可被維持在約500mTorr至約30Torr之間、約1Torr至約20Torr之間、或約5Torr至約15Torr之間。
在一個或多個實施例中,基材處理腔室1001可被整合成各種多處理平台,該等平台包括可購自美國加州聖克拉拉市的應用材料公司的ProducerTMGT、CenturaTMAP及EnduraTM平台。該處理平台係能夠執行數種處理操作而不破真空。除了其他類型的腔室之外,可實施本發明之實施例的處理腔室可包括介電蝕刻腔室或各種化學氣相沉積腔室。
沉積系統的實施例可併入至用於生產積體電路晶片
的較大型製造系統。第3圖顯示根據所揭露的實施例之一個沉積、烘烤及固化腔室之此類系統1101。在該圖中,一對FOUP(前開式晶圓盒)1102供應基材基材(例如300mm直徑的晶圓),在該等基材被放進基材處理腔室1108a-f之一者前,基材是由機械手臂1104接收並放置到低壓固持區域1106。第二機械手臂1110可用於從固持區域1106傳輸基材晶圓至處理腔室1108a-f並且往回傳輸。每一基材處理腔室1108a-f可被裝備成執行多個基材處理操作,該等操作除了循環層沉積(CLD)、原子層沉積(ALD)、化學氣相沉積(CVD)、物理氣相沉積(PVD)、蝕刻、預清潔、脫器、定向及其他基材製程之外,還包括在此所述的乾式蝕刻製程。
基材處理腔室1108a-f可包括一個或多個系統部件,以在基材晶圓上沉積、退火、固化及/或蝕刻可流動的介電膜。在一種配置方式中,兩對處理腔室(例如,1108c-d及1108e-f)可用於沉積介電材料於基材上,而第三對處理腔室(例如,1108a-b)可用於蝕刻沉積的介電質。在另一配置方式中,所有三對腔室(例如1108a-f)可經配置以蝕刻於基材上的介電膜。任一或多個所述的製程可在與不同實施例中所示的製造系統分開的腔室上執行。
系統控制器1157係用於控制馬達、閥、流量控制器、電源供應器以及需要執行在此所述製程配方的其他功能。氣體操縱系統1155也可由系統控制器1157控制,以將氣體導入基材處理腔室1108a-f的其中一個或全部。系統控制器1157可依賴來自光學感測器的反饋,以確定並調整氣體操
縱系統1155及/或基材處理腔室1108a-f中的可移動的機械組件之位置。機械組件可包括機器人、節流閥及基座,該組件在系統控制器1157之控制下經由馬達移動。
在例示性實施例中,系統控制器1157包括硬碟機(記憶體)、USB埠、軟碟機及處理器。系統控制器1157包括類比數位輸入/輸出板、介面板及步進馬達控制板。含有處理腔室1001的多重腔室處理系統1101之各部件經由系統控制器1157控制。系統控制器執行系統控制軟體,該軟體以電腦程式之形式儲存在電腦可讀媒體上,該等媒體諸如硬碟、軟碟或快閃記憶體隨身碟。亦可使用其他種類的記憶體。電腦程式包括指令集,該等指令集指示時間、氣體之混合、腔室壓力、腔室溫度、RF功率層級、基座位置及特殊製程的其他參數。
可使用經由控制器執行的電腦程式產品實施用於在基材上沉積膜或其他方式處理膜的製程或者用於清潔腔室的製程。電腦程式編碼可以任何習知的電腦可讀的程式語言來撰寫,例如68000組語、C、C++、Pascal、Fortran或其他的程式語言。使用習知的文件編輯器將適合的程式編碼編入單一檔案或多重檔案,並且儲存於電腦可使用的媒體(如電腦的記憶體系統)或由該媒體實施。如果編入的編碼內文係高階語言,則編譯編碼,且所得的編譯編碼隨後與預先編譯的Microsoft Windows®程式館常式之目的碼連結。為了執行該連結、編譯的目的碼,系統使用者援用該目的碼,使電腦系統載入記憶體中的編碼。CPU隨後讀取並且執行該編碼,以操
作程式中辨識的任務。
使用者與控制器之間的介面可透過接觸感應顯示器,亦可包括滑鼠及鍵盤。在一個實施例中,使用兩個顯示器,一個安裝在無塵室壁以供操作者使用,另一個在壁後以供維修技術人員使用。兩個顯示器可同時顯示相同資訊,該實例中,一次僅有一個被設置成接受輸入。為了選擇特殊的螢幕或功能,操作者以手指或滑鼠接觸顯示器螢幕上的指定的區域。接觸區域改變該區域的強調色彩,或顯示新的選單或螢幕,確認操作者的選擇。
在此所使用的「基材」可為具有(或不具有)形成在上面的多個層的支撐基材。該圖案化基材可為有各種摻雜濃度及摻雜輪廓的絕緣體或半導體,且例如可為用在積體電路製造上的類型的半導體基材。圖案化基材所暴露的「氧化矽」主要是SiO2但可包括其他元素組份(諸如氮、氫、碳、與類似元素)的濃度。在一些實施例中,使用在此揭露的方法所蝕刻的氧化矽膜基本上由矽與氧構成。術語「前驅物」是指任何參與反應從表面移除材料或沉積材料在表面上的製程氣體。「電漿流出物」是描述從腔室電漿區域離開並進入基材處理區域的氣體。電漿流出物是處於「激發態」,其中至少有一些氣體分子係處於振動型式的激發、解離及/或離子化的狀態。「自由基前驅物」是用於描述參與反應從表面移除材料或沉積材料在表面上的電漿流出物(離開電漿而處於激發態的氣體)。「自由基-氟前驅物」是一種含有氟但可含有其他元素組份的自由基前驅物。「自由基-氧前驅物」是一種含有氧但可含
有其他元素組份的自由基前驅物。術語「惰氣」是指在蝕刻或被併入膜中時不形成化學鍵結的任何氣體。例示性的惰氣包括稀有氣體,但可包括其他氣體,只要當(一般而言)在膜中補捉到痕量的該氣體時不形成化學鍵結即可。
全文中所用之術語「間隙」(gap)與「溝槽」(trench)係非意味經蝕刻之幾何形狀具有大的水平深寬比。由表面上方來看,溝槽可顯現圓形、卵形、多邊形、矩形或各種其他形狀。溝槽可以呈現材料島狀物(例如實質上圓柱狀的TiN柱狀物)周圍的壕溝形狀。術語「貫孔」(via)係用於指可或可不被金屬填充而形成垂直的電性連接的低深寬比溝槽(由上方觀看)。如在此所用,共形蝕刻製程係指以與表面相同的形狀大體上均勻地移除表面上的材料,即經蝕刻之層的表面與蝕刻前的表面係大體上平行。發明所屬技術領域中具有通常知識者將瞭解經蝕刻之介面可能不會100%共形,因此術語「大體上」容許可接受的容忍度。
已在此揭露數個實施例,發明所屬技術領域中具有通常知識者應知可使用各種修飾例、替代架構與等效例而不會背離所揭露之實施例的精神。此外,為了避免不必要地混淆本發明,未描述多種習知的製程及元件。因此,上述說明不應被視為對本發明範疇之限制。
在提供一範圍之值之情況下,除非本文另有明確指定,應理解亦特定地揭露該範圍之上限與下限之間的每一中間值,精確度為至下限單位的十分位。將涵蓋在陳述範圍中之任一陳述值或中間值與在彼陳述範圍中之任一其他陳述值
或中間值之間的每一較小範圍。該等較小範圍的上限值與下限值可獨立包含或排除於該範圍中,且各範圍(其中,在該較小範圍內包含任一個極限值、不含極限值或包含兩個極限值)皆被本發明內所陳述之範圍涵蓋,除非在該陳述的範圍中有特別排除之限制。在所陳述之範圍包括極限值的一者或兩者之處,該範圍也包括該些排除其中任一者或兩者被包括的極限值的範圍。
在此與如後附申請專利範圍中所使用之單數形式「一(a、an)」與「該(the)」也包括複數個參考對象,除非本文中另外清楚指明。因此,舉例而言,所述及「一種製程(a process)」包括複數個此類製程,而述及「該介電材料(the dielectric material)」包括一或多種介電材料以及該領域中具有通常知識者所熟知的該等材料之等效例等。
又,在此說明書與下述申請專利範圍中所用的「包含(comprise)」與「包括(include)」等用語係欲意指存在所陳述之特徵、整體、部件或步驟,但該等用語不排除存在或增加一或多種其他特徵、整體、部件、步驟、動作或群組。
110-145‧‧‧處理步驟
Claims (19)
- 一種在基材處理腔室之基材處理區域中蝕刻圖案化基材之方法,其中該圖案化基材具有一暴露的氧化矽區域,該方法包含以下步驟:使一含氟前驅物流進一遠端電漿區域,同時在該遠端電漿區域中形成一遠端電漿以產生電漿流出物,該遠端電漿區域流通式耦接(fluidly coupled)至該基材處理區域;使一含氮和氫前驅物流進該基材處理區域中,毋先使該含氮和氫前驅物通過該遠端電漿區域;以及在該基材處理區域中,以該等電漿流出物及該含氮和氫前驅物的組合蝕刻該暴露的氧化矽區域。
- 如請求項1所述之方法,進一步包含以下步驟:在該遠端電漿之形成期間,使一含氧前驅物流進該遠端電漿區域。
- 如請求項1所述之方法,進一步包含以下步驟:在該遠端電漿之形成期間,使分子氧、二氧化氮或一氧化二氮之一者流進該遠端電漿區域。
- 如請求項1所述之方法,其中該含氮和氫前驅物係由氮和氫組成。
- 如請求項1所述之方法,其中該含氮和氫前驅物包含氨。
- 如請求項1所述之方法,其中該圖案化基材進一步包含一暴露的多晶矽區域,且該蝕刻操作之選擇性(暴露的氧化矽區域:暴露的多晶矽區域)係大於或約50:1。
- 如請求項1所述之方法,其中該圖案化基材進一步包含一暴露的多晶矽區域,且該蝕刻操作之選擇性(暴露的氧化矽區域:暴露的多晶矽區域)係大於或約100:1。
- 如請求項1所述之方法,其中該圖案化基材進一步包含一暴露的氮化矽區域,且該蝕刻操作之選擇性(暴露的氧化矽區域:暴露的氮化矽區域)係大於或約30:1。
- 如請求項1所述之方法,其中該圖案化基材進一步包含一暴露的氮化矽區域,且該蝕刻操作之選擇性(暴露的氧化矽區域:暴露的氮化矽區域)係大於或約70:1。
- 如請求項1所述之方法,其中該基材處理區域係無電漿。
- 如請求項1所述之方法,其中該含氮和氫前驅物係未被任何遠端電漿激發,該遠端電漿係在該基材處理區域之外側形成。
- 如請求項1所述之方法,其中該含氟前驅物包含一種前驅物,該前驅物係選自由氟原子、雙原子氟、三氟化氮、四 氟化碳、氟化氫及二氟化氙所組成之群組。
- 如請求項1所述之方法,其中該含氟前驅物及該等電漿流出物係實質上不含氫。
- 如請求項1所述之方法,其中該含氟前驅物流過一雙區噴淋頭(showerhead)中的多個通孔且該氨係通過該雙區噴淋頭中的多個不同的區(separate zone),其中該等不同的區通往該基材處理區域,但不通往該遠端電漿區域。
- 如請求項1所述之方法,其中在該蝕刻操作期間,該圖案化基材之溫度係大於或約10℃且小於或約250℃。
- 如請求項1所述之方法,其中在該蝕刻操作期間,該圖案化基材之溫度係大於或約100℃且小於或約140℃。
- 如請求項1所述之方法,其中在該蝕刻操作期間,該基材處理區域內之壓力係低於或約50托耳(Torr)且高於或約0.1托耳。
- 如請求項1所述之方法,其中在該遠端電漿區域中形成電漿以產生電漿流出物包含以下步驟:施加一射頻(RF)功率至該電漿區域,該射頻功率係介於約10瓦(Watts)與約2000瓦之間。
- 如請求項1所述之方法,其中在該遠端電漿區域中之電漿係一電容式耦合的電漿。
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