TWI546353B - 鹼性化學機械拋光液 - Google Patents
鹼性化學機械拋光液 Download PDFInfo
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- TWI546353B TWI546353B TW102101580A TW102101580A TWI546353B TW I546353 B TWI546353 B TW I546353B TW 102101580 A TW102101580 A TW 102101580A TW 102101580 A TW102101580 A TW 102101580A TW I546353 B TWI546353 B TW I546353B
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- 238000005498 polishing Methods 0.000 title claims description 58
- 239000007788 liquid Substances 0.000 title claims description 34
- 239000000126 substance Substances 0.000 title claims description 11
- 239000007800 oxidant agent Substances 0.000 claims description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- KAESVJOAVNADME-UHFFFAOYSA-N 1H-pyrrole Natural products C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 claims description 6
- -1 azole compound Chemical class 0.000 claims description 6
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 claims description 6
- 239000003002 pH adjusting agent Substances 0.000 claims description 5
- VDZOOKBUILJEDG-UHFFFAOYSA-M tetrabutylammonium hydroxide Chemical compound [OH-].CCCC[N+](CCCC)(CCCC)CCCC VDZOOKBUILJEDG-UHFFFAOYSA-M 0.000 claims description 5
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 2
- GEIAQOFPUVMAGM-UHFFFAOYSA-N ZrO Inorganic materials [Zr]=O GEIAQOFPUVMAGM-UHFFFAOYSA-N 0.000 claims description 2
- SXDBWCPKPHAZSM-UHFFFAOYSA-M bromate Inorganic materials [O-]Br(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-M 0.000 claims description 2
- SXDBWCPKPHAZSM-UHFFFAOYSA-N bromic acid Chemical compound OBr(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-N 0.000 claims description 2
- IJRVQAXSAHHCNH-UHFFFAOYSA-M butyl(trimethyl)azanium;hydroxide Chemical compound [OH-].CCCC[N+](C)(C)C IJRVQAXSAHHCNH-UHFFFAOYSA-M 0.000 claims description 2
- KHIWWQKSHDUIBK-UHFFFAOYSA-N periodic acid Chemical compound OI(=O)(=O)=O KHIWWQKSHDUIBK-UHFFFAOYSA-N 0.000 claims description 2
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 2
- QVOFCQBZXGLNAA-UHFFFAOYSA-M tributyl(methyl)azanium;hydroxide Chemical compound [OH-].CCCC[N+](C)(CCCC)CCCC QVOFCQBZXGLNAA-UHFFFAOYSA-M 0.000 claims description 2
- AQLJVWUFPCUVLO-UHFFFAOYSA-N urea hydrogen peroxide Chemical compound OO.NC(N)=O AQLJVWUFPCUVLO-UHFFFAOYSA-N 0.000 claims description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims 1
- 230000004888 barrier function Effects 0.000 description 21
- 239000010949 copper Substances 0.000 description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 11
- 229910052802 copper Inorganic materials 0.000 description 11
- 230000007547 defect Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 230000002378 acidificating effect Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000007517 polishing process Methods 0.000 description 3
- 150000003852 triazoles Chemical class 0.000 description 3
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 2
- 150000003851 azoles Chemical class 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- CMGDVUCDZOBDNL-UHFFFAOYSA-N 4-methyl-2h-benzotriazole Chemical compound CC1=CC=CC2=NNN=C12 CMGDVUCDZOBDNL-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical compound C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 150000007513 acids Chemical class 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
- 150000001412 amines Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000005605 benzo group Chemical group 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 150000002466 imines Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
- 125000003831 tetrazolyl group Chemical group 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Description
本發明涉及一種化學機械拋光液。
隨著半導體技術的不斷發展,積體電路的器件尺寸縮小、佈線層數增加,金屬銅被廣泛用作互連線路的材料,銅比鋁的優勢在於具有較低的電阻率,而且對電遷移具有高阻抗。但為了防止銅溶於介電材料,所以在銅和介電材料之間需要覆蓋一層擴散阻擋層,常規的阻擋層材料包括鉭、氮化鉭、鈦、氮化鈦等。
當前半導體製造商製造的積體電路的佈線層數越多,對每一層的積體電路的平坦化技術變得尤為關鍵,其中,由IBM公司在二十世紀80年代首創的化學機械拋光(CMP)技術被認為是目前全局平坦化的最有效的方法。化學機械拋光(CMP)是一種由化學作用、機械作用以及這兩種作用相結合而實現平坦化的技術。銅的CMP工藝一般分為兩步,第一步用一種拋光液快速去除阻擋層上面覆蓋的銅金屬,該拋光液通常具有很高銅的拋光速率和低的阻擋層拋光速率,以便快速去除阻擋層表面多餘的銅後停止在阻擋層上。第二步用一種阻擋層拋光液去除阻擋層和少量的介電層,通過去除阻擋層、介電層和銅之間不同的選擇比,實現積體電路的平坦化。
目前的阻擋層拋光液可以分為兩種,酸性阻擋層拋光液和鹼性阻擋層拋光液。
涉及酸性拋光液的專利有很多,比如CN1312845A專利,該專利中公開了一種酸性阻擋層拋光液,其含有金屬磨料和大量大分子的表面活性劑。但該拋光液存在拋光表面損傷,且為對設備腐蝕污染嚴重的酸性物質。
鹼性的阻擋層拋光液,比如:CN101302405A專利,該專利公開了一種鹼性阻擋層拋光液,其含有聚乙烯基吡咯烷酮和亞胺,碳酸鹽、抑制劑、絡合劑。但其在拋光過程中會產生大量的泡沫,使拋光液在拋光墊和拋光表面的分佈不均衡,而且影響拋光液的穩定性。
CN1400266專利,該專利含有胺和非離子表面活性劑。但該拋光液在拋光時對阻擋層的表面損失比較厲害。
本發明所要解決的問題是提供一種滿足阻擋層拋光階段的要求,具有高的阻擋層(Ta/TaN)去除速率,可適應不同拋光過程中封蓋材料(TEOS)、金屬Cu的去除速率和選擇比要求,且快速矯正半導體器件表面所存在的缺陷的能力強,污染物殘留少,穩定性高的鹼性化學機械拋光液。
本發明提供了一種鹼性化學機械拋光液,用於拋光阻擋層。其同時含有:研磨顆粒,唑類化合物,C1~C4季銨鹼的一種或者多種,氧化劑,水和pH調節劑,拋光液的pH值為8~12,優選為9~12。
其中,研磨顆粒,選自SiO2、Al2O3、ZrO2、SiC、CeO2、TiO2和Si3N4中的一種或多種,優選SiO2。其濃度範圍:1%~40%;優選:1%~20%。
其中,唑類化合物,選自三氮唑及其衍生物、四氮唑及其衍生物和噻唑及其衍生物中的一種或者多種,優選三氮唑及其衍生物,較佳的為苯並三氮唑(BTA)和/或甲基苯並三氮唑(TTA),進一步優選TTA。唑類化合物的濃度範
圍:0.002%~5%。
其中,C1~C4季銨鹼,選自四甲基氫氧化銨(TMAH)、四丁基氫氧化銨(TBAH)、丁基三甲基氫氧化銨、三丁基甲基氫氧化銨中的一種或者多種。其濃度範圍:0.005%~5%。
其中,氧化劑包括過氧化氫、溴酸鹽、高碘酸鹽、次氯酸鹽、過氧化脲、過氧乙酸、過硫酸鹽和單過硫酸鹽的一種或多種,優選過氧化氫。氧化劑的濃度範圍:0.01%~5%,優選範圍:0.01%~2%。
其中,pH值調節劑,包括各類鹼或者各類酸。其中,鹼優選KOH;酸優選HNO3。
本發明的拋光液所具備的有益效果是:滿足阻擋層拋光階段的要求,具有高的阻擋層(Ta/TaN)去除速率,可適應不同拋光過程中封蓋材料(TEOS)、金屬Cu的去除速率和選擇比要求,且快速矯正半導體器件表面所存在的缺陷的能力強,污染物殘留少,穩定性高。
下面用實施例來進一步說明本發明,但本發明並不受其限制。下述實施例中,百分比均為質量百分比含量,其定義為(個別成份之重量/總重量)x100%。
給出了本發明的化學機械拋光液實施例1-14及對比例1-2的配方,按表1中所列組分及其含量,在去離子水中混合均勻,用pH調節劑調到所需pH值,即可制得化學機械拋光液。表2中顯示的是實施例1-14、對比例1-2對不同材料的去除速率和矯正能力進行比較。
拋光條件:拋光機台為Logitech(英國)1PM52型,FUJIBO拋光墊,4cm×4cm正方形晶圓(Wafer),研磨壓力1.5psi,研磨台轉速70轉/分鐘,研磨頭自轉轉速150轉/分鐘,拋光液滴加速度100 ml/分鐘。
通過對比例1-2和實施例1-6對比發現,在磨料、氧化劑、唑類的基礎上,加入C1-C4的季銨鹼中的一種或者多種,不影響銅,鉭和Teos的去除速率。
通過實施例1-3和對比例1-2對比發現,加入單一一種C1-C4的季銨鹼後,拋光液對寬線區和細線區的缺陷有一定矯正能力。
通過實施例1-6和對比例1-2對比發現,當加入C1-C4的季銨鹼兩種或者兩種以上時,拋光液對寬線區和細線區的缺陷矯正明顯提高,能在短時間矯正半導體器件的缺陷表面,從而實現平坦化。
通過實施例1-6對比發現,TTA比BTA更能降低銅的去除速率,在缺陷矯正能力方面優於BTA。
Claims (17)
- 一種鹼性化學機械拋光液,含有:研磨顆粒,唑類化合物,C1~C4季銨鹼的一種或者多種,氧化劑,水和pH調節劑,所述拋光液的pH值為8~12,其特征在于,所述的唑类化合物為BTA和/或TTA。
- 根據請求項1所述的拋光液,其中所述的研磨顆粒選自SiO2、Al2O3、ZrO2、SiC、CeO2、TiO2和Si3N4中的一種或多種。
- 根據請求項2所述的拋光液,其中所述的研磨顆粒為SiO2。
- 根據請求項1或2所述的拋光液,其中所述的研磨顆粒濃度為品質百分比含量1%~40%。
- 根據請求項4所述的拋光液,其中所述的研磨顆粒濃度為品質百分比含量1%~20%。
- 根據請求項1所述的拋光液,其中所述的唑类化合物為TTA。
- 根據請求項6所述的拋光液,其中所述的唑類化合物的品質百分比含量為0.002%~5%。
- 根據請求項1所述的拋光液,其中所述的C1~C4季銨鹼選自TMAH、TBAH、丁基三甲基氫氧化銨和三丁基甲基氫氧化銨中的一種或者多種。
- 根據請求項8所述的拋光液,其中所述的C1~C4季銨鹼的品質百分比含量為0.005%~5%。
- 根據請求項1所述的拋光液,其中所述的氧化劑為選自過氧化氫、溴酸鹽、高碘酸鹽、次氯酸鹽、過氧化脲、過氧乙酸、過硫酸鹽和單過硫酸鹽的一種或多種。
- 根據請求項10所述的拋光液,其中所述的氧化劑為過氧化氫。
- 根據請求項11所述的拋光液,其中所述的氧化劑的品質百分比含量為0.01%~5%。
- 根據請求項12所述的拋光液,其中所述的氧化劑的品質百分比含量為0.01%~2%。
- 根據請求項1所述的拋光液,其中所述的pH值調節劑為鹼或酸。
- 根據請求項14所述的拋光液,其中所述的鹼為KOH。
- 根據請求項14所述的拋光液,其中所述的酸為HNO3。
- 根據請求項1所述的拋光液,其中所述的拋光液pH值為9~12。
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CN201210012743.1A CN103205205B (zh) | 2012-01-16 | 2012-01-16 | 一种碱性化学机械抛光液 |
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CN104745089A (zh) * | 2013-12-25 | 2015-07-01 | 安集微电子(上海)有限公司 | 一种用于阻挡层平坦化的化学机械抛光液及其使用方法 |
CN106916536B (zh) * | 2015-12-25 | 2021-04-20 | 安集微电子(上海)有限公司 | 一种碱性化学机械抛光液 |
CN105950022B (zh) * | 2016-07-22 | 2018-07-03 | 成都贝瑞光电科技股份有限公司 | 一种复合抛光液 |
CN106566473A (zh) * | 2016-10-28 | 2017-04-19 | 扬州翠佛堂珠宝有限公司 | 一种红宝石研磨液 |
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