JP2016164965A - 超低抵抗率銅配線を有する半導体集積回路装置 - Google Patents
超低抵抗率銅配線を有する半導体集積回路装置 Download PDFInfo
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- 239000010949 copper Substances 0.000 title claims abstract description 206
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 180
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 176
- 239000004065 semiconductor Substances 0.000 title claims abstract description 35
- 239000012535 impurity Substances 0.000 claims abstract description 106
- 239000013078 crystal Substances 0.000 claims abstract description 58
- 230000000694 effects Effects 0.000 claims abstract description 23
- 229910001902 chlorine oxide Inorganic materials 0.000 claims abstract description 13
- MAYPHUUCLRDEAZ-UHFFFAOYSA-N chlorine peroxide Chemical compound ClOOCl MAYPHUUCLRDEAZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 239000010936 titanium Substances 0.000 claims description 22
- 239000011575 calcium Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- 239000011651 chromium Substances 0.000 claims description 16
- 239000011669 selenium Substances 0.000 claims description 16
- 239000011734 sodium Substances 0.000 claims description 16
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 13
- 229910052719 titanium Inorganic materials 0.000 claims description 13
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 10
- 229910052791 calcium Inorganic materials 0.000 claims description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 9
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 9
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 9
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims description 9
- 229910052785 arsenic Inorganic materials 0.000 claims description 9
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 238000009713 electroplating Methods 0.000 claims description 9
- 239000011591 potassium Substances 0.000 claims description 9
- 229910052700 potassium Inorganic materials 0.000 claims description 9
- 229910052711 selenium Inorganic materials 0.000 claims description 9
- 229910052708 sodium Inorganic materials 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 238000007747 plating Methods 0.000 abstract description 16
- 239000000654 additive Substances 0.000 description 77
- 230000000996 additive effect Effects 0.000 description 77
- 239000000460 chlorine Substances 0.000 description 15
- 238000004458 analytical method Methods 0.000 description 13
- 239000008151 electrolyte solution Substances 0.000 description 11
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 229910052801 chlorine Inorganic materials 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 239000003792 electrolyte Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 8
- NHYCGSASNAIGLD-UHFFFAOYSA-N Chlorine monoxide Chemical compound Cl[O] NHYCGSASNAIGLD-UHFFFAOYSA-N 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 7
- 238000010894 electron beam technology Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910052715 tantalum Inorganic materials 0.000 description 4
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000002050 diffraction method Methods 0.000 description 3
- 230000007717 exclusion Effects 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000013507 mapping Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- JZCCFEFSEZPSOG-UHFFFAOYSA-L copper(II) sulfate pentahydrate Chemical compound O.O.O.O.O.[Cu+2].[O-]S([O-])(=O)=O JZCCFEFSEZPSOG-UHFFFAOYSA-L 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000002524 electron diffraction data Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 potassium (K) Chemical class 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
Images
Abstract
【解決手段】本発明は、半導体集積回路装置において電気メッキ及び熱処理によって銅配線における銅結晶粒を成長させるにあたり、銅との親和性が高く、かつ、塩素酸化物との親和性も高い元素を、銅の結晶粒界の移動をピン止め効果によって阻害する不純物として特定する。なお、前記銅との親和性を、銅と不純物とが結合している状態と結合しないで独立でいる状態との差を示す凝集エネルギーを算出することにより判断し、前記塩素酸化物との親和性を、塩素酸化物と不純物とが結合している状態と結合しないで独立でいる状態との差を示す凝集エネルギーを算出することにより判断する。
【選択図】図9
Description
110:結晶粒界
111:結晶粒界
200:不純物
201:不純物
210:不純物
211:不純物
212:不純物
213:不純物
300:クラスター
400:銅配線メッキ
401:電解メッキ装置
410:基板
420:絶縁体
430:薄膜
431:薄膜
440:シード層
450:配線溝
460:アノード
470:電解液
480:回転電極
490:回転子
500:コントローラ
510:電流制御装置
520:パルス発生器
550:化学的機械研磨
600:電子線後方散乱回折法
610:電子線
620:検出器
650:方位マッピング像
660:逆極点図
670:座標系
680:高さ
Claims (6)
- 半導体集積回路装置において電気メッキ及び熱処理によって銅配線における銅結晶粒を成長させるにあたり、銅との親和性が高く、かつ、塩素酸化物との親和性も高い元素を、銅の結晶粒界の移動をピン止め効果によって阻害する不純物として特定する、
ことを特徴とする方法。 - 前記銅との親和性を、銅と不純物とが結合している状態と結合しないで独立でいる状態との差を示す凝集エネルギーを算出することにより判断し、
前記塩素酸化物との親和性を、塩素酸化物と不純物とが結合している状態と結合しないで独立でいる状態との差を示す凝集エネルギーを算出することにより判断する、
ことを特徴とする請求項1に記載の方法。 - 請求項1又は2に記載の方法によって特定された不純物が混入しないプロセスで前記電気メッキ及び前記熱処理を行い、
前記不純物の濃度が、鉄について0.03ppm以下、クロムについて0.009ppm以下、チタンについて0.019ppm以下、砒素について0.04ppm以下、及びジルコニウムについて0.2ppm以下となるように前記銅配線を形成する、
ことを特徴とする銅配線の形成方法。 - さらに前記不純物の濃度が、カリウムについて0.057ppm以下、ナトリウムについて0.23ppm以下、及びカルシウムについて0.56ppm以下となるように前記銅配線を形成する、
ことを特徴とする請求項3に記載の銅配線の形成方法。 - さらに前記不純物の濃度が、セレンについて0.25ppm以下、及び亜鉛について2.1ppm以下となるように前記銅配線を形成する、
ことを特徴とする請求項4に記載の銅配線の形成方法。 - 請求項3乃至5の何れか一に記載の銅配線の形成方法により超低抵抗率の銅配線が形成された、
ことを特徴とする半導体集積回路装置。
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