JP7389230B2 - 垂直方向に離隔されたチャネル材料セグメントを有する集積アセンブリ及び集積アセンブリを形成する方法 - Google Patents
垂直方向に離隔されたチャネル材料セグメントを有する集積アセンブリ及び集積アセンブリを形成する方法 Download PDFInfo
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- 239000000463 material Substances 0.000 title claims description 194
- 238000000034 method Methods 0.000 title claims description 125
- 239000011800 void material Substances 0.000 claims description 85
- 239000003989 dielectric material Substances 0.000 claims description 70
- 239000011232 storage material Substances 0.000 claims description 58
- 230000000903 blocking effect Effects 0.000 claims description 47
- 239000011810 insulating material Substances 0.000 claims description 27
- 230000002093 peripheral effect Effects 0.000 claims description 19
- 239000004020 conductor Substances 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 239000010703 silicon Substances 0.000 claims description 13
- 238000012876 topography Methods 0.000 claims description 10
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 9
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 9
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 5
- 229910000449 hafnium oxide Inorganic materials 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- 229910052735 hafnium Inorganic materials 0.000 claims description 2
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 7
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 230000001590 oxidative effect Effects 0.000 claims 1
- 238000003860 storage Methods 0.000 description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 18
- 239000000203 mixture Substances 0.000 description 17
- 239000004065 semiconductor Substances 0.000 description 17
- 230000008569 process Effects 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 235000012239 silicon dioxide Nutrition 0.000 description 9
- 239000000377 silicon dioxide Substances 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 239000000758 substrate Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 5
- 230000005012 migration Effects 0.000 description 4
- 238000013508 migration Methods 0.000 description 4
- 230000005641 tunneling Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000000231 atomic layer deposition Methods 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000013500 data storage Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910005540 GaP Inorganic materials 0.000 description 1
- 229910004129 HfSiO Inorganic materials 0.000 description 1
- GEIAQOFPUVMAGM-UHFFFAOYSA-N Oxozirconium Chemical compound [Zr]=O GEIAQOFPUVMAGM-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- 229910006501 ZrSiO Inorganic materials 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000002800 charge carrier Substances 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
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- -1 etc.) Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- HZXMRANICFIONG-UHFFFAOYSA-N gallium phosphide Chemical compound [Ga]#P HZXMRANICFIONG-UHFFFAOYSA-N 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 235000012431 wafers Nutrition 0.000 description 1
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- H10B43/27—EEPROM devices comprising charge-trapping gate insulators characterised by three-dimensional arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels the channels comprising vertical portions, e.g. U-shaped channels
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- H01L21/0214—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC the material being a silicon oxynitride, e.g. SiON or SiON:H
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- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
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- H01L29/49—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET
- H01L29/4983—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET with a lateral structure, e.g. a Polysilicon gate with a lateral doping variation or with a lateral composition variation or characterised by the sidewalls being composed of conductive, resistive or dielectric material
- H01L29/4991—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET with a lateral structure, e.g. a Polysilicon gate with a lateral doping variation or with a lateral composition variation or characterised by the sidewalls being composed of conductive, resistive or dielectric material comprising an air gap
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- H01L29/49—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET
- H01L29/51—Insulating materials associated therewith
- H01L29/511—Insulating materials associated therewith with a compositional variation, e.g. multilayer structures
- H01L29/513—Insulating materials associated therewith with a compositional variation, e.g. multilayer structures the variation being perpendicular to the channel plane
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- H10B41/23—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by three-dimensional arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels
- H10B41/27—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by three-dimensional arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels the channels comprising vertical portions, e.g. U-shaped channels
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Description
この特許は、2019年8月22日に出願された米国特許出願シリアル番号16/548,320の優先権を主張し、その開示は参照により本明細書に組み込まれる。
垂直方向に離隔されたチャネル材料セグメントを有する集積アセンブリ(例えば、集積NANDメモリ)、及び集積アセンブリを形成する方法。
Claims (31)
- 交互の絶縁性レベル及び導電性レベルの垂直方向のスタックと、
前記スタックを通って垂直方向に拡張するチャネル材料と、
前記チャネル材料に面する前面を有し、前記前面から後方に拡張する上面及び下面を有する前記導電性レベルと、
垂直方向に積み重ねられ且つ相互に垂直方向に離隔された複数の第1のセグメントの状態で配列された高k誘電体材料であって、前記導電性レベルの前記前面に沿っているが、各々の導電性レベルの前記前面を越えて拡張してはおらず、かつ、前記導電性レベルの前記上面及び前記下面に沿っていない前記高k誘電体材料と、
垂直方向に積み重ねられ且つ相互に垂直方向に離隔された複数の第2のセグメントの状態で配列された電荷遮断材料であって、前記第2のセグメントは前記第1のセグメントに隣接する、前記電荷遮断材料と、
垂直方向に積み重ねられ且つ相互に垂直方向に離隔された複数の第3のセグメントの状態で配列された電荷蓄積材料であって、前記第3のセグメントは前記第2のセグメントに隣接する、前記電荷蓄積材料と、
前記電荷蓄積材料に隣接し、前記電荷蓄積材料と前記チャネル材料との間にあるゲート誘電体材料と
を含む集積構造体。 - 前記前面は第1の垂直方向寸法を有し、前記第1のセグメントは、前記第1の垂直方向寸法と同じ第2の垂直方向寸法を有する、請求項1に記載の集積構造体。
- 前記前面は第1の垂直方向寸法を有し、
前記第1のセグメントは第2の垂直方向寸法を有し、
前記第2のセグメントは第3の垂直方向寸法を有し、
前記第2の垂直方向寸法は、前記第1の垂直方向寸法と同じであり、
前記第3の垂直方向寸法は、前記第2の垂直方向寸法よりも大きい、
請求項1に記載の集積構造体。 - 前記第3のセグメントは第4の垂直方向寸法を有し、
前記第4の垂直方向寸法は、前記第3の垂直方向寸法よりも大きいか同じである、
請求項3に記載の集積構造体。 - 前記高k誘電体材料は、酸化アルミニウム、酸化ハフニウム、ケイ酸ハフニウム、酸化ジルコニウム、及びケイ酸ジルコニウムの内の1つ以上を含む、請求項1に記載の集積構造体。
- 前記第3のセグメントの各々は実質的に平坦な構成を有する、請求項1に記載の集積構造体。
- 前記第3のセグメントの各々は丸みを帯びた構成を有する、請求項1に記載の集積構造体。
- 前記導電性レベルは2つ以上の導電性材料を含む、請求項1に記載の集積構造体。
- 前記高k誘電体材料は、前記2つ以上の導電性材料の内の1つに直接接触する、請求項8に記載の集積構造体。
- 交互の絶縁性レベル及び導電性レベルの垂直方向のスタックと、
制御ゲート領域を含む前記導電性レベルと、
前記制御ゲート領域に隣接し、相互に垂直方向に離隔され且つ前記導電性レベルの前面を越えて拡張しない、垂直方向に拡張する複数の第1の直線状セグメントの配列として構成される高k誘電体材料と、
前記高k誘電体材料に隣接し、相互に垂直方向に離隔された、垂直方向に拡張する複数の第2の直線状セグメントの配列として構成される電荷遮断材料と、
前記電荷遮断材料に隣接し、相互に垂直方向に離隔された、垂直方向に拡張する複数の第3の直線状セグメントの配列として構成される電荷蓄積材料と、
前記電荷蓄積材料に隣接するゲート誘電体材料と、
前記スタックに沿って垂直方向に拡張し、前記ゲート誘電体材料に隣接するチャネル材料と
を含む、NANDメモリアレイ。 - 垂直方向に拡張する前記第2の直線状セグメントは、垂直方向に拡張する前記第1の直線状セグメントと少なくとも同じ長さである、請求項10に記載のNANDメモリアレイ。
- 垂直方向に拡張する前記第3の直線状セグメントは、垂直方向に拡張する前記第2の直線状セグメントと少なくとも同じ長さである、請求項11に記載のNANDメモリアレイ。
- 前記絶縁性レベルは、絶縁性材料で少なくとも部分的に充填される、請求項10に記載のNANDメモリアレイ。
- 前記絶縁性レベルは、前記絶縁性材料で部分的にのみ充填される、請求項13に記載のNANDメモリアレイ。
- 前記絶縁性レベルは前記絶縁性材料で完全に充填される、請求項13に記載のNANDメモリアレイ。
- 前記導電性レベルは厚さを有し、垂直方向に拡張する前記第1の直線状セグメントは、前記厚さと同じ長さを有する、請求項10に記載のNANDメモリアレイ。
- 交互の第1及び第2レベルの垂直方向のスタックを形成することであって、前記第1レベルは第1の材料を含み、前記第2レベルは第2の材料を含むことと、
前記スタックを通って拡張するように、周辺側壁を有する開口部を形成することと、
前記周辺側壁に隣接して電荷遮断材料を形成することと、
前記電荷遮断材料に隣接して電荷蓄積材料を形成することと、
前記電荷蓄積材料に隣接してゲート誘電体材料を形成することと、
前記ゲート誘電体材料に隣接してチャネル材料を形成することと、
前記第2の材料を除去することにより、第1のボイドを形成することと、
前記第1のボイド内に導電性レベルを形成することであって、前記導電性レベルは、前面を備えた前端を有し、前記前面は前記電荷遮断材料に面することと、
前記前面と前記電荷遮断材料との間にあるように高k誘電体材料を形成することであって、前記高k誘電体材料は、相互に垂直方向に離隔された複数の第1のセグメントとして構成され、前記第1のセグメントは、前記導電性レベルの前記前面に沿っているが、前記前面を越えて拡張してはおらず、かつ、前記導電性レベルの前記前端の周囲を包み込まない、ことと、
前記第1の材料を除去することにより、第2のボイドを形成することと、
前記電荷蓄積材料を垂直方向に離隔された複数のセグメントに分割するように前記電荷蓄積材料を通って前記第2のボイドを拡張すること
を含む集積構造体を形成する方法。 - 前記第1のボイドをライニングするように前記第1のボイド内に前記高k誘電体材料を形成することであって、前記導電性レベルの前記形成は、ライニングされた前記第1のボイド内に導電性材料を形成することを含み、前記第2のボイドの前記形成は、前記導電性材料の上方及び下方の前記高k誘電体材料の部分を露出し、前記第2のボイドは垂直方向の厚さを有すること、を含み、以下のステップを以下の順序で更に含むことであって、
前記高k誘電体材料の露出した前記部分を除去することと、
前記垂直方向の厚さを狭めるために、前記第2のボイド内にストリップを形成することと、
前記電荷蓄積材料を前記垂直方向に離隔された複数のセグメントに分割するように、前記電荷遮断材料を通って、前記電荷蓄積材料をその後通って前記第2のボイドを拡張することと、
前記第2のボイドを絶縁性材料で少なくとも部分的に充填すること
を更に含む、請求項17に記載の方法。 - 前記第1のボイドをライニングするように前記第1のボイド内に前記高k誘電体材料を形成することであって、前記導電性レベルの前記形成は、ライニングされた前記第1のボイド内に導電性材料を形成することを含み、前記第2のボイドの前記形成は、前記導電性材料の上方及び下方の前記高k誘電体材料の部分を露出し、前記第2のボイドは垂直方向の厚さを有すること、を含み、
前記高k誘電体材料の露出した前記部分を除去することと、
前記垂直方向の厚さを狭めるために、前記第2のボイド内に犠牲材料を形成することと、
前記垂直方向の厚さが狭められた後、前記電荷蓄積材料を前記垂直方向に離隔された複数のセグメントに分割するように、前記電荷遮断材料を通って、前記電荷蓄積材料をその後通って前記第2のボイドを拡張することと、
前記犠牲材料を除去することと、
前記犠牲材料を除去することの後に、前記第2のボイドを絶縁性材料で少なくとも部分的に充填すること
を更に含む、請求項17に記載の方法。 - 前記犠牲材料は窒化ケイ素を含む、請求項19に記載の方法。
- 前記第1レベルに沿って空洞を形成するために、前記第2レベルに対して前記第1レベルを窪ませることと、
実質的に真っ直ぐな側壁表面を有するように前記開口部の前記周辺側壁を形成するために前記空洞を犠牲材料で充填することであって、前記電荷遮断材料の前記形成は、前記実質的に真っ直ぐな側壁表面に沿って前記電荷遮断材料を形成することを含むことと、
前記第2のボイドの前記形成中に前記犠牲材料を除去すること
を含む、請求項17に記載の方法。 - 前記電荷遮断材料は、前記実質的に真っ直ぐな側壁表面に沿った実質的に平坦なトポグラフィを有し、前記電荷蓄積材料は、前記実質的に平坦なトポグラフィに沿って形成され、前記電荷蓄積材料の前記垂直方向に離隔された複数のセグメントの各々は、実質的に平坦な構成を有する、請求項21に記載の方法。
- 前記犠牲材料は多結晶シリコンを含む、請求項21に記載の方法。
- 前記高k誘電体材料は、前記スタックを通って垂直方向に拡張する層として最初に形成され、
前記第1の材料の前記除去は、前記高k誘電体材料の領域を露出し、
前記領域の少なくとも一部分は除去される、
請求項17に記載の方法。 - 前記第2のボイドは垂直方向の厚さを有し、以下のステップを以下の順序で更に含むことであって、
前記垂直方向の厚さを狭め、かつ、前記高k誘電体材料の露出する量を削減するために、前記第2のボイド内にストリップを形成することと、
露出した前記高k誘電体材料の、前記ストリップによって覆われていない部分を除去することと、
前記第2のボイドを絶縁性材料で少なくとも部分的に充填すること
を更に含む、請求項24に記載の方法。 - 前記第2のボイドは垂直方向の厚さを有し、
前記垂直方向の厚さを狭め、かつ、前記高k誘電体材料の露出する量を削減するために、前記第2のボイド内に犠牲材料を形成することと、
露出した前記高k誘電体材料の、前記犠牲材料によって覆われていない部分を除去することと、
前記犠牲材料を除去することと、
前記犠牲材料を除去することの後に、前記第2のボイドを絶縁性材料で少なくとも部分的に充填すること
を更に含む、請求項24に記載の方法。 - 前記犠牲材料は窒化ケイ素を含む、請求項26に記載の方法。
- 前記第1レベルに沿って空洞を形成し、かつ、前記開口部の第1の起伏のある側壁表面を形成するために、前記第2レベルに対して前記第1レベルを窪ませることと、
前記第1の起伏のある表面に沿ってシリコンの層を形成することと、
残余のシリコンの横方向に外側に酸化物を形成するためにシリコンの前記層を部分的に酸化することであって、前記残余のシリコンは前記空洞内にあることと、
前記残余のシリコンに沿って、及び前記第2レベルの前記第2の材料に沿って拡張する第2の起伏のある表面を有するように前記開口部の前記周辺側壁を形成するために、前記酸化物を除去することであって、前記電荷遮断材料の前記形成は、前記第2の起伏のある表面に沿って前記電荷遮断材料を形成することを含むこと
を含む、請求項17に記載の方法。 - 前記電荷遮断材料は、前記第2の起伏のある表面に沿った起伏のあるトポグラフィを有し、前記電荷蓄積材料は、前記電荷遮断材料の前記起伏のあるトポグラフィに沿って形成され、前記電荷蓄積材料の前記垂直方向に離隔された複数のセグメントの各々は、丸みを帯びた構成を有する、請求項28に記載の方法。
- 前記第1のボイドをライニングするように前記第1のボイド内に前記高k誘電体材料を形成することであって、前記導電性レベルの前記形成は、ライニングされた前記第1のボイド内に導電性材料を形成することを含み、前記第2のボイドの前記形成は、前記導電性材料の上方及び下方の前記高k誘電体材料の部分を露出すること、を含み、前記高k誘電体材料の露出した前記部分を除去することを更に含む、請求項28に記載の方法。
- 前記第2のボイドを絶縁性材料で少なくとも部分的に充填することを更に含む、請求項30に記載の方法。
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