JP2009177161A - 絶縁膜の形成方法 - Google Patents
絶縁膜の形成方法 Download PDFInfo
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- JP2009177161A JP2009177161A JP2008327944A JP2008327944A JP2009177161A JP 2009177161 A JP2009177161 A JP 2009177161A JP 2008327944 A JP2008327944 A JP 2008327944A JP 2008327944 A JP2008327944 A JP 2008327944A JP 2009177161 A JP2009177161 A JP 2009177161A
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- film
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- 238000000034 method Methods 0.000 title claims abstract description 110
- 238000009413 insulation Methods 0.000 title claims abstract 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 226
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 220
- 239000010703 silicon Substances 0.000 claims abstract description 195
- 229910052751 metal Inorganic materials 0.000 claims abstract description 172
- 239000002184 metal Substances 0.000 claims abstract description 170
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 113
- 239000000758 substrate Substances 0.000 claims abstract description 107
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 76
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 69
- 238000005121 nitriding Methods 0.000 claims abstract description 38
- 238000004544 sputter deposition Methods 0.000 claims abstract description 38
- 229910052735 hafnium Inorganic materials 0.000 claims abstract description 37
- -1 nitride silicate Chemical class 0.000 claims abstract description 34
- 230000001590 oxidative effect Effects 0.000 claims abstract description 34
- 239000012298 atmosphere Substances 0.000 claims abstract description 26
- 239000002344 surface layer Substances 0.000 claims abstract description 19
- 238000000151 deposition Methods 0.000 claims abstract description 11
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 10
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims abstract description 7
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 74
- 239000007789 gas Substances 0.000 claims description 28
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 25
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 10
- 238000005546 reactive sputtering Methods 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 80
- 229910052760 oxygen Inorganic materials 0.000 abstract description 46
- 239000001301 oxygen Substances 0.000 abstract description 40
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 37
- 230000000717 retained effect Effects 0.000 abstract description 3
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 description 65
- 125000004429 atom Chemical group 0.000 description 47
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 18
- 229910052914 metal silicate Inorganic materials 0.000 description 17
- 239000000203 mixture Substances 0.000 description 16
- 238000009792 diffusion process Methods 0.000 description 10
- 239000012535 impurity Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000004140 cleaning Methods 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 150000004767 nitrides Chemical class 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 229910044991 metal oxide Inorganic materials 0.000 description 5
- 150000004706 metal oxides Chemical class 0.000 description 5
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 229910052734 helium Inorganic materials 0.000 description 4
- 229910052754 neon Inorganic materials 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052743 krypton Inorganic materials 0.000 description 2
- 229910052747 lanthanoid Inorganic materials 0.000 description 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052724 xenon Inorganic materials 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- BSYNRYMUTXBXSQ-UHFFFAOYSA-N Aspirin Chemical compound CC(=O)OC1=CC=CC=C1C(O)=O BSYNRYMUTXBXSQ-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000005300 metallic glass Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 150000002835 noble gases Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001443 photoexcitation Effects 0.000 description 1
- 230000001698 pyrogenic effect 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
- 230000008719 thickening Effects 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
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- H01L21/02148—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 silicon and at least one metal element, e.g. metal silicate based insulators or metal silicon oxynitrides the material containing hafnium, e.g. HfSiOx or HfSiON
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Abstract
【解決手段】金属原子及びシリコン原子が酸化反応を生じ難い雰囲気中にてスパッタ法によりシリコン基体101上に金属及びシリコンからなる膜102を堆積する第1の工程と、膜102を窒素プラズマを用いて窒化して窒素、金属及びシリコンからなる膜103を形成する第2の工程と、膜103を酸素プラズマを用いて酸化して窒化金属シリケート膜104を形成する第3の工程とを含む。第1の工程の終了から第2の工程の開始までの間、膜102を、その酸化反応が生じ難い雰囲気中に保持する。第3の工程により、膜104の下のシリコン基体101の表層部を酸化してシリコン酸化膜105を形成する。金属は、少なくともハフニウム及びジルコニウムのうちのいずれかを含む。
【選択図】図1
Description
シリコン基体の上に窒化金属シリケートを含む絶縁膜を形成する絶縁膜の形成方法であって、
前記シリコン基体の上に金属及びシリコンからなる膜を、非酸化雰囲気中でスパッタ法により堆積する第1の工程と、
前記金属及びシリコンからなる膜を窒化して窒素、金属及びシリコンからなる膜を形成する第2の工程と、
前記窒素、金属及びシリコンからなる膜を酸化して窒化金属シリケート膜を形成する第3の工程と、を有することを特徴とする絶縁膜の形成方法、
が提供される。
シリコン基体の上に窒化金属シリケートを含む絶縁膜を形成する絶縁膜の形成方法であって、
前記シリコン基体の上に窒素、金属及びシリコンからなる膜を、非酸化雰囲気中で、少なくとも窒素原子を含むガスを用いたリアクティブスパッタ法により堆積する第1の工程と、
前記窒素、金属及びシリコンからなる膜を酸化して窒化金属シリケート膜を形成する第2の工程と、を有することを特徴とする絶縁膜の形成方法、
が提供される。
図1は、本発明の第一の実施形態を説明するための工程断面図である。ここで、101はシリコン基体であり、少なくともその表面にはシリコン原子が露出している。102は金属及びシリコンからなる膜、103は窒化された金属及びシリコンからなる膜すなわち窒素、金属及びシリコンからなる膜、104は窒化金属シリケート膜、105はシリコン酸化膜である。絶縁膜は、窒化金属シリケート膜104とシリコン酸化膜105とにより形成される。ここで、シリコン酸化膜105が存在するこことで、界面特性が向上し、絶縁膜の電気的絶縁性が高められる。但し、シリコン酸化膜105は、窒化金属シリケート膜104より比誘電率が小さいので、シリコン酸化膜105の膜厚は、窒化金属シリケート膜104の膜厚より小さくするのが好ましい。例えば、窒化金属シリケート膜104の膜厚は1nm〜5nmが好ましく、1.5nm〜3nmがより好ましい。また、シリコン酸化膜105の膜厚は0.5nm〜2nmが好ましく、0.5nm〜1.5nmがより好ましい。
次に、本発明の第二の実施形態について、図2を参照して詳細に説明する。この図において、図1のものと同様な部分または部材には、同一の符号が付されており、ここではその説明を省略する。
次に、本発明の第三の実施形態について、図3を参照して詳細に説明する。この図において、図1または図2のものと同様な部分または部材には、同一の符号が付されており、ここではその説明を省略する。
次に、本発明の第四の実施形態について、図4を参照して詳細に説明する。この図において、図1〜図3のものと同様な部分または部材には、同一の符号が付されており、ここではその説明を省略する。
本実施例は、図1の実施形態に従って実施した。シリコン基体101として、直径200mmのP型単結晶シリコン基板を使用した。
本実施例は、図2の実施形態に従って実施した。シリコン基体101として、直径200mmのP型単結晶シリコン基板を使用した。
本実施例は、図3の実施形態に従って実施した。シリコン基体101として、直径200mmのP型単結晶シリコン基板を使用した。
本実施例は、図4の実施形態に従って実施した。シリコン基体101として、直径200mmのP型単結晶シリコン基板を使用した。
本実施例では、本発明による絶縁膜の形成方法に従い成膜した高誘電率絶縁膜の電気的特性評価を行った。
102 金属及びシリコンからなる膜
103 窒化された金属及びシリコンからなる膜
104 窒化金属シリケート膜
105 シリコン酸化膜
Claims (14)
- シリコン基体の上に窒化金属シリケートを含む絶縁膜を形成する絶縁膜の形成方法であって、
前記シリコン基体の上に金属及びシリコンからなる膜を、非酸化雰囲気中でスパッタ法により堆積する第1の工程と、
前記金属及びシリコンからなる膜を窒化して窒素、金属及びシリコンからなる膜を形成する第2の工程と、
前記窒素、金属及びシリコンからなる膜を酸化して窒化金属シリケート膜を形成する第3の工程と、を有することを特徴とする絶縁膜の形成方法。 - 前記金属は、少なくともハフニウム及びジルコニウムのうちのいずれかを含むことを特徴とする、請求項1に記載の絶縁膜の形成方法。
- 前記第1の工程の終了から前記第2の工程の開始までの間、前記金属及びシリコンからなる膜を、非酸化雰囲気中に保持することを特徴とする、請求項1又は2に記載の絶縁膜の形成方法。
- 前記第2の工程で、少なくとも窒素原子を含むプラズマを用いて、前記金属及びシリコンからなる膜を窒化することを特徴とする、請求項1〜3のいずれか一項に記載の絶縁膜の形成方法。
- 前記第3の工程で、少なくとも酸素原子を含むプラズマを用いて、前記窒素、金属及びシリコンからなる膜を酸化することを特徴とする、請求項1〜4のいずれか一項に記載の絶縁膜の形成方法。
- 前記第3の工程で、マイクロ波プラズマ源を用いて、前記窒素、金属及びシリコンからなる膜を酸化することを特徴とする、請求項5に記載の絶縁膜の形成方法。
- 前記第3の工程により、前記窒素、金属及びシリコンからなる膜の下の前記シリコン基体の表層部を酸化してシリコン酸化膜を形成することを特徴とする、請求項1〜6のいずれか一項に記載の絶縁膜の形成方法。
- 前記第1の工程において、前記シリコン基体の表層部を酸化してシリコン酸化膜を形成し、該シリコン酸化膜の上に前記金属及びシリコンからなる膜を堆積することを特徴とする、請求項1〜7のいずれか一項に記載の絶縁膜の形成方法。
- シリコン基体の上に窒化金属シリケートを含む絶縁膜を形成する絶縁膜の形成方法であって、
前記シリコン基体の上に窒素、金属及びシリコンからなる膜を、非酸化雰囲気中で、少なくとも窒素原子を含むガスを用いたリアクティブスパッタ法により堆積する第1の工程と、
前記窒素、金属及びシリコンからなる膜を酸化して窒化金属シリケート膜を形成する第2の工程と、を有することを特徴とする絶縁膜の形成方法。 - 前記金属は、少なくともハフニウム及びジルコニウムのうちのいずれかを含むことを特徴とする、請求項9に記載の絶縁膜の形成方法。
- 前記第2の工程で、少なくとも酸素原子を含むプラズマを用いて、前記窒素、金属及びシリコンからなる膜を酸化することを特徴とする、請求項9又は10に記載の絶縁膜の形成方法。
- 前記第2の工程で、マイクロ波プラズマ源を用いて、前記窒素、金属及びシリコンからなる膜を酸化することを特徴とする、請求項11に記載の絶縁膜の形成方法。
- 前記第2の工程により、前記窒素、金属及びシリコンからなる膜の下の前記シリコン基体の表層部を酸化してシリコン酸化膜を形成することを特徴とする、請求項9〜12のいずれか一項に記載の絶縁膜の形成方法。
- 前記第1の工程において、前記シリコン基体の表層部を酸化してシリコン酸化膜を形成し、該シリコン酸化膜の上に前記窒素、金属及びシリコンからなる膜を堆積することを特徴とする、請求項9〜13のいずれか一項に記載の絶縁膜の形成方法。
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