JP4667742B2 - キャパシタの製造方法 - Google Patents
キャパシタの製造方法 Download PDFInfo
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- JP4667742B2 JP4667742B2 JP2003435043A JP2003435043A JP4667742B2 JP 4667742 B2 JP4667742 B2 JP 4667742B2 JP 2003435043 A JP2003435043 A JP 2003435043A JP 2003435043 A JP2003435043 A JP 2003435043A JP 4667742 B2 JP4667742 B2 JP 4667742B2
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- 239000003990 capacitor Substances 0.000 title claims description 51
- 238000004519 manufacturing process Methods 0.000 title claims description 37
- 239000007789 gas Substances 0.000 claims description 33
- 238000003860 storage Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 26
- 150000004767 nitrides Chemical class 0.000 claims description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 18
- 239000012535 impurity Substances 0.000 claims description 18
- 239000010410 layer Substances 0.000 claims description 18
- 229910052710 silicon Inorganic materials 0.000 claims description 18
- 239000010703 silicon Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000004065 semiconductor Substances 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 10
- 239000011229 interlayer Substances 0.000 claims description 9
- 239000011261 inert gas Substances 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 238000009279 wet oxidation reaction Methods 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000003989 dielectric material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- H01L21/3143—Inorganic layers composed of alternated layers or of mixtures of nitrides and oxides or of oxinitrides, e.g. formation of oxinitride by oxidation of nitride layers
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Description
まず、半導体基板上に電荷格納電極コンタクトプラグが備えられた層間絶縁膜を形成させる。層間絶縁膜上に電荷格納電極を形成した後、電荷格納電極が大気に触れることにより電荷格納電極の表面上に生じた自然酸化膜をHF系列の洗浄溶液で取り除くとともに、その後、O2,H2OまたはO3を含む気相中で第一酸化膜の形成を行う。あるいは、NH4OHとH2O2混合物系列の洗浄溶液を用いて自然酸化膜を取り除いた後、第一酸化膜を湿式酸化方法により形成する。
そして次に、第一酸化膜上に窒化膜を形成させ、再びH2Oを含む気相中で窒化膜を酸化させて第二酸化膜を形成した後に、プレート電極をドーピングされたシリコンで形成させる。
半導体基板上に層間絶縁膜を形成する段階と、前記層間絶縁膜上にドーピングされたシリコン層で電荷格納電極を形成する段階と、前記電荷格納電極上に第一酸化膜を形成する段階と、前記第一酸化膜をn型不純物を含む気体の気相中で熱処理することにより、前記第一酸化膜を前記n型不純物を含有した酸化材質に変化させる段階と、前記第一酸化膜上に窒化膜を形成する段階と、前記窒化膜上に第二酸化膜を形成する段階とを含むことを特徴とする。
請求項1において、
前記ドーピングされたシリコン層は、n型不純物が1E20〜5E21/cm3の濃度でドーピングされたシリコン層であることを特徴とする。
請求項1において、
前記第一酸化膜を形成する前に、電荷格納電極表面の自然酸化膜を取り除く段階を含むことを特徴とする。
請求項1において、
前記第一酸化膜の厚さは、5〜25Åであることを特徴とする。
請求項1において、
前記第一酸化膜を形成する段階は、常温〜80℃の温度でNH4OHとH2O2混合水溶液に1〜10分間前記半導体基板を沈積して形成する湿式酸化工程、及び酸素を含む気体の気相中で500〜800℃の温度及び6.67〜1.01x105Paの圧力下で3〜120分間前記半導体基板を熱処理する工程の中から選択されたいずれか一つであることを特徴とする。
請求項1において、
前記熱処理工程は、PH3またはAsH3 及びこれらの組合せの中から選択されたいずれか一つの気体の気相中、500〜800℃の温度及び6.67〜1.01x105Paの圧力で3〜180分間行われることを特徴とする。
請求項6において、
前記気体の気相中は、不活性ガスを含むことを特徴とする。
請求項1において、
前記窒化膜の厚さは30〜60Åであることを特徴とする。
請求項1において、
前記第二酸化膜を形成する段階は、酸素原子を含む気体の気相中、650〜800℃の温度及び6.67〜1.01x105Paの圧力で3〜120分間行われる熱処理工程であることを特徴とする。
図1に示すように、シリコンウェーハ等の半導体基板上(図示省略)には、所定の下部構造物、例えば素子分離酸化膜(図示省略)とMOSFET(図示省略) などを形成した後に、半導体基板の所定領域に電気的に接続する電荷格納電極用コンタクトプラグ(図示省略)を備えて平坦化した層間絶縁膜10を形成する。次に、層間絶縁膜10上に、例えば n型不純物であるPまたはAsなどの不純物を、望ましくは1E20〜5E21/cm3濃度でドーピングされたシリコン層である電荷格納電極12を形成する。ここで、電荷格納電極が大気に触れることにより電荷格納電極の表面上に自然酸化膜13が存在する場合、自然酸化膜13をHF系列の洗浄溶液で取り除く。
その後、図2に示すように、電荷格納電極12上に第一酸化膜14を5 〜25Å程度の厚さで形成する。 第一酸化膜14を形成する際、湿式酸化方法を利用する場合には、常温〜80℃の温度で、NH4OHとH2O2混合水溶液に1〜10分間沈積するような化学的な方法で形成することが望ましい。また第一酸化膜14を形成する際、乾式酸化方法を利用する場合には500〜800℃の温度及び6.67〜1.01x105Paの圧力下で酸素を含む気体、例えばO2,H2O,N2O,NOまたはO3等を用い、これらの気体を単独あるいは混合気体の気相中で、必要な場合にはArなどの不活性ガスも混合した気相中で、3〜120分間熱処理して形成することが望ましい。なお、ここで、第一酸化膜14の厚さを適切に調節すれば自然酸化膜13を除去することなく第一酸化膜14を形成することも可能である。
そして、図4に示すように、第二酸化膜18上部にドーピングされたシリコンから成るプレート電極20を形成し、電荷格納電極の電荷空乏現象を防止し、破壊電圧を低下させることなく窒化膜の厚さを減少させることができるキャパシタを得る。
12 電荷格納電極
13 自然酸化膜
14 第一酸化膜
16 窒化膜
18 第二酸化膜
20 プレート電極
Claims (9)
- 第一酸化膜―窒化膜―第二酸化膜構造の誘電膜を用いるキャパシタの製造方法において、
半導体基板上に層間絶縁膜を形成する段階と、
前記層間絶縁膜上にドーピングされたシリコン層で電荷格納電極を形成する段階と、
前記電荷格納電極上に第一酸化膜を形成する段階と、
前記第一酸化膜をn型不純物を含む気体の気相中で熱処理することにより、前記第一酸化膜を前記n型不純物を含有した酸化材質に変化させる段階と、
前記第一酸化膜上に窒化膜を形成する段階と、
前記窒化膜上に第二酸化膜を形成する段階と
を含むことを特徴とするキャパシタの製造方法。 - 前記ドーピングされたシリコン層は、n型不純物が1E20〜5E21/cm3の濃度でドーピングされたシリコン層であることを特徴とする請求項1に記載のキャパシタの製造方法。
- 前記第一酸化膜を形成する前に、電荷格納電極表面の自然酸化膜を取り除く段階を含むことを特徴とする請求項1に記載のキャパシタの製造方法。
- 前記第一酸化膜の厚さは、5〜25Åであることを特徴とする請求項1に記載のキャパシタの製造方法。
- 前記第一酸化膜を形成する段階は、常温〜80℃の温度でNH4OHとH2O2混合水溶液に1〜10分間前記半導体基板を沈積して形成する湿式酸化工程、及び酸素を含む気体の気相中で500〜800℃の温度及び6.67〜1.01x105Paの圧力下で3〜120分間前記半導体基板を熱処理する工程の中から選択されたいずれか一つであることを特徴とする請求項1に記載のキャパシタの製造方法。
- 前記熱処理工程は、PH3またはAsH3 及びこれらの組合せの中から選択されたいずれか一つの気体の気相中、500〜800℃の温度及び6.67〜1.01x105Paの圧力で3〜180分間行われることを特徴とする請求項1に記載のキャパシタの製造方法。
- 前記気体の気相中は、不活性ガスを含むことを特徴とする請求項6に記載のキャパシタの製造方法。
- 前記窒化膜の厚さは30〜60Åであることを特徴とする請求項1に記載のキャパシタの製造方法。
- 前記第二酸化膜を形成する段階は、酸素原子を含む気体の気相中、650〜800℃の温度及び6.67〜1.01x105Paの圧力で3〜120分間行われる熱処理工程であることを特徴とする請求項1に記載のキャパシタの製造方法。
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KR10-2003-0009756A KR100520600B1 (ko) | 2003-02-17 | 2003-02-17 | 반도체소자의 캐패시터 제조방법 |
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JP2004253784A JP2004253784A (ja) | 2004-09-09 |
JP4667742B2 true JP4667742B2 (ja) | 2011-04-13 |
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JP2003435043A Expired - Fee Related JP4667742B2 (ja) | 2003-02-17 | 2003-12-26 | キャパシタの製造方法 |
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US (1) | US7153739B2 (ja) |
JP (1) | JP4667742B2 (ja) |
KR (1) | KR100520600B1 (ja) |
TW (1) | TWI242283B (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8336308B2 (en) | 2006-11-06 | 2012-12-25 | Freni Brembo S.P.A. | Lever device for operating a hydraulic actuator, particularly for motorcycles |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US7611995B2 (en) * | 2003-04-22 | 2009-11-03 | Tokyo Electron Limited | Method for removing silicon oxide film and processing apparatus |
KR100568516B1 (ko) * | 2004-02-24 | 2006-04-07 | 삼성전자주식회사 | 후처리 기술을 사용하여 아날로그 커패시터를 제조하는 방법 |
JP2006245415A (ja) * | 2005-03-04 | 2006-09-14 | Sharp Corp | 半導体記憶装置及びその製造方法、並びに携帯電子機器 |
CN103594354B (zh) * | 2013-11-08 | 2016-07-06 | 溧阳市江大技术转移中心有限公司 | 一种电介质层的制造方法 |
CN103606513B (zh) * | 2013-11-08 | 2016-02-17 | 溧阳市江大技术转移中心有限公司 | 一种半导体电容器的制造方法 |
CN111312696B (zh) * | 2018-12-12 | 2022-06-17 | 上海川土微电子有限公司 | 一种用于提高数字隔离器芯片耐压值的隔离电容 |
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- 2003-02-17 KR KR10-2003-0009756A patent/KR100520600B1/ko not_active IP Right Cessation
- 2003-11-26 US US10/721,092 patent/US7153739B2/en not_active Expired - Fee Related
- 2003-11-27 TW TW092133346A patent/TWI242283B/zh not_active IP Right Cessation
- 2003-12-26 JP JP2003435043A patent/JP4667742B2/ja not_active Expired - Fee Related
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JPH02354A (ja) * | 1989-02-08 | 1990-01-05 | Hitachi Ltd | 大規模半導体メモリ |
JPH0344068A (ja) * | 1989-07-12 | 1991-02-25 | Oki Electric Ind Co Ltd | 半導体装置の製造方法 |
JPH07240390A (ja) * | 1994-02-28 | 1995-09-12 | Fujitsu Ltd | 半導体装置の製造方法 |
JPH0878543A (ja) * | 1994-08-31 | 1996-03-22 | Nkk Corp | 不揮発性半導体メモリ装置及びその製造方法 |
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US8336308B2 (en) | 2006-11-06 | 2012-12-25 | Freni Brembo S.P.A. | Lever device for operating a hydraulic actuator, particularly for motorcycles |
Also Published As
Publication number | Publication date |
---|---|
JP2004253784A (ja) | 2004-09-09 |
TWI242283B (en) | 2005-10-21 |
KR100520600B1 (ko) | 2005-10-10 |
TW200417000A (en) | 2004-09-01 |
KR20040074245A (ko) | 2004-08-25 |
US7153739B2 (en) | 2006-12-26 |
US20040161890A1 (en) | 2004-08-19 |
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