JP2010103414A - 不揮発性半導体記憶装置およびその製造方法 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 77
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical class N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 72
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 36
- 238000011282 treatment Methods 0.000 claims abstract description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 22
- 238000002955 isolation Methods 0.000 claims description 61
- 238000000034 method Methods 0.000 claims description 32
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 29
- 230000003647 oxidation Effects 0.000 claims description 26
- 238000007254 oxidation reaction Methods 0.000 claims description 26
- 238000003860 storage Methods 0.000 claims description 24
- 239000000758 substrate Substances 0.000 claims description 24
- 239000007800 oxidant agent Substances 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 9
- 238000003475 lamination Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 230000001629 suppression Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 68
- 238000005121 nitriding Methods 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 12
- 238000000576 coating method Methods 0.000 description 12
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 10
- 229910052710 silicon Inorganic materials 0.000 description 10
- 239000010703 silicon Substances 0.000 description 10
- 125000004429 atom Chemical group 0.000 description 9
- 238000005229 chemical vapour deposition Methods 0.000 description 9
- 150000004767 nitrides Chemical class 0.000 description 7
- 101100535994 Caenorhabditis elegans tars-1 gene Proteins 0.000 description 5
- 238000005530 etching Methods 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229910052735 hafnium Inorganic materials 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- BUMGIEFFCMBQDG-UHFFFAOYSA-N dichlorosilicon Chemical compound Cl[Si]Cl BUMGIEFFCMBQDG-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 125000004430 oxygen atom Chemical group O* 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004129 HfSiO Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- MFHHXXRRFHXQJZ-UHFFFAOYSA-N NONON Chemical group NONON MFHHXXRRFHXQJZ-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000003213 activating effect Effects 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
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000011529 conductive interlayer Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- -1 hafnium aluminate Chemical class 0.000 description 1
- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(iv) oxide Chemical compound O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000001420 photoelectron spectroscopy Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920001709 polysilazane Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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Abstract
【解決手段】浮遊ゲート電極FGと制御電極CGとの間に形成されたゲート間絶縁膜7が、シリコン窒化膜7a−シリコン酸化膜7b−シリコン窒化膜7c−シリコン酸化膜7d−シリコン酸化膜7eの積層構造によって構成されている。このうち、シリコン窒化膜7aは、その窒素濃度が単位面積あたり21×1015[atoms/cm2]以上に構成されている。また、シリコン窒化膜7aは、その形成後に酸化処理を行うことで素子分離絶縁膜4の上面上から消失される。
【選択図】図3
Description
また本発明の一態様によれば、隣り合うメモリセル間の干渉を極力抑制できる。
図5ないし図14は、それぞれ図3(a)に対応した断面構造の一製造段階を模式的に示している。
図5に示すように、半導体基板2の表層にウェル、チャネル形成用の不純物を注入した(図示せず)後、半導体基板2の上面上にゲート絶縁膜5を熱酸化法により所定膜厚(例えば1nm〜15nm程度)形成する。次に、図6に示すように、ゲート絶縁膜5上に化学気相成長法により電荷蓄積層となる多結晶シリコン層6を所定膜厚(例えば10nm〜200nm程度)形成する。次に、図7に示すように、化学気相成長法(CVD法)によりシリコン窒化膜10を所定膜厚(例えば50nm〜200nm程度)形成し、次に、化学気相成長法によりシリコン酸化膜11を所定膜厚(例えば50nm〜400nm程度)形成する。
本発明は、上記実施形態に限定されるものではなく、例えば、以下に示す変形または拡張が可能である。
NAND型フラッシュメモリ装置1に適用したが、これに限定されるものではなく、NOR型フラッシュメモリなど電荷蓄積層を有するメモリセルを用いた不揮発性半導体記憶装置に適用できる。
半導体基板2は、p型シリコン基板であっても、n型シリコン基板の表層にp型ウェルを形成した半導体基板を適用しても良い。
素子分離絶縁膜4は、HDP−CVD法により形成されたシリコン酸化膜を組み合わせて構成されていても良い。
シリコン窒化膜7aの酸化処理のタイミングとしてシリコン窒化膜7aの形成直後に行った実施形態を示したが、シリコン酸化膜7bの形成直後に行っても良い。すなわち、シリコン窒化膜7cの形成前であれば良い。
Claims (5)
- 半導体基板と、
前記半導体基板上に形成された第1の絶縁層と、
前記第1の絶縁層上に形成された複数の電荷蓄積層と、
前記複数の電荷蓄積層間に形成された素子分離絶縁膜と、
前記複数の電荷蓄積層上および前記素子分離絶縁膜上に沿って形成された第2の絶縁層であって、第1のシリコン窒化膜、第1のシリコン酸化膜、7以上の比誘電率を有する中間絶縁膜、第2のシリコン酸化膜の積層構造を含んで構成された第2の絶縁層と、
前記第2の絶縁層上に形成された制御電極とを備え、
前記第1のシリコン窒化膜は、その窒素濃度が単位面積あたり21×1015[atoms/cm2]以上であることを特徴とする不揮発性半導体記憶装置。 - 前記第1のシリコン窒化膜が、前記素子分離絶縁膜上に直接形成されておらず前記素子分離絶縁膜上に直接シリコン酸化膜が形成されていることを特徴とする請求項1記載の不揮発性半導体記憶装置。
- 半導体基板上に第1の絶縁層を形成する工程と、
前記第1の絶縁層上に電荷蓄積層を形成する工程と、
前記電荷蓄積層および前記第1の絶縁層並びに前記半導体基板に素子分離溝を形成することで前記電荷蓄積層を複数に分断する工程と、
前記電荷蓄積層の少なくとも一部が露出するように前記素子分離溝内に素子分離絶縁膜を形成する工程と、
前記電荷蓄積層の露出面上および前記素子分離絶縁膜上に第2の絶縁層を形成する工程であって、第1のシリコン窒化膜、第1のシリコン酸化膜、7以上の比誘電率を有する中間絶縁膜、第2のシリコン酸化膜を順に積層することによって第2の絶縁層を形成する工程と、
前記第2の絶縁層上に制御電極を形成する工程とを備え、
前記第1のシリコン窒化膜を形成した後、ないし、前記第1のシリコン酸化膜形成直後で前記中間絶縁膜を形成する前に酸化処理を行う工程を設けたことを特徴とする不揮発性半導体記憶装置の製造方法。 - 前記酸化処理を行う工程では、酸素と水素を半導体基板上で反応させた酸化剤を用いることを特徴とする請求項3記載の不揮発性半導体記憶装置の製造方法。
- 前記酸化処理を行う工程では、物理的に酸素を励起させて発生させた酸化剤を用いることを特徴とする請求項3記載の不揮発性半導体記憶装置の製造方法。
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Application Number | Priority Date | Filing Date | Title |
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JP2008275558A JP5361328B2 (ja) | 2008-10-27 | 2008-10-27 | 不揮発性半導体記憶装置の製造方法 |
US12/467,424 US8022467B2 (en) | 2008-10-27 | 2009-05-18 | Nonvolatile semiconductor memory device and method of fabricating the same |
KR1020090101720A KR101076081B1 (ko) | 2008-10-27 | 2009-10-26 | 불휘발성 반도체 기억 장치 및 그 제조 방법 |
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JP5361328B2 (ja) | 2013-12-04 |
US8546216B2 (en) | 2013-10-01 |
KR20100047148A (ko) | 2010-05-07 |
US20100102377A1 (en) | 2010-04-29 |
US8022467B2 (en) | 2011-09-20 |
US20110312155A1 (en) | 2011-12-22 |
KR101076081B1 (ko) | 2011-10-21 |
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