JP5072357B2 - 不揮発性メモリセルアレイを作る方法 - Google Patents
不揮発性メモリセルアレイを作る方法 Download PDFInfo
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- JP5072357B2 JP5072357B2 JP2006517221A JP2006517221A JP5072357B2 JP 5072357 B2 JP5072357 B2 JP 5072357B2 JP 2006517221 A JP2006517221 A JP 2006517221A JP 2006517221 A JP2006517221 A JP 2006517221A JP 5072357 B2 JP5072357 B2 JP 5072357B2
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- 230000015654 memory Effects 0.000 title claims description 40
- 238000000034 method Methods 0.000 title claims description 39
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 58
- 229920005591 polysilicon Polymers 0.000 claims description 58
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 28
- 239000000758 substrate Substances 0.000 claims description 27
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 25
- 238000005530 etching Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 230000000873 masking effect Effects 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 125000006850 spacer group Chemical group 0.000 claims description 9
- 229910021332 silicide Inorganic materials 0.000 claims description 8
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000000151 deposition Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 239000003989 dielectric material Substances 0.000 claims 8
- 239000004065 semiconductor Substances 0.000 claims 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 47
- 235000012239 silicon dioxide Nutrition 0.000 description 23
- 239000000377 silicon dioxide Substances 0.000 description 23
- 230000006870 function Effects 0.000 description 22
- 230000008878 coupling Effects 0.000 description 12
- 238000010168 coupling process Methods 0.000 description 12
- 238000005859 coupling reaction Methods 0.000 description 12
- 238000009792 diffusion process Methods 0.000 description 6
- 238000002513 implantation Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 238000003491 array Methods 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 239000003870 refractory metal Substances 0.000 description 2
- 229910019001 CoSi Inorganic materials 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- -1 arsenic ions Chemical class 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005496 tempering 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
- WQJQOUPTWCFRMM-UHFFFAOYSA-N tungsten disilicide Chemical compound [Si]#[W]#[Si] WQJQOUPTWCFRMM-UHFFFAOYSA-N 0.000 description 1
- 229910021342 tungsten silicide Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/28008—Making conductor-insulator-semiconductor electrodes
- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
- H01L21/28026—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor
- H01L21/28123—Lithography-related aspects, e.g. sub-lithography lengths; Isolation-related aspects, e.g. to solve problems arising at the crossing with the side of the device isolation; Planarisation aspects
- H01L21/28141—Lithography-related aspects, e.g. sub-lithography lengths; Isolation-related aspects, e.g. to solve problems arising at the crossing with the side of the device isolation; Planarisation aspects insulating part of the electrode is defined by a sidewall spacer, e.g. dummy spacer, or a similar technique, e.g. oxidation under mask, plating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/401—Multistep manufacturing processes
- H01L29/4011—Multistep manufacturing processes for data storage electrodes
- H01L29/40114—Multistep manufacturing processes for data storage electrodes the electrodes comprising a conductor-insulator-conductor-insulator-semiconductor structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
- H01L29/42324—Gate electrodes for transistors with a floating gate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66825—Unipolar field-effect transistors with an insulated gate, i.e. MISFET with a floating gate
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/30—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B69/00—Erasable-and-programmable ROM [EPROM] devices not provided for in groups H10B41/00 - H10B63/00, e.g. ultraviolet erasable-and-programmable ROM [UVEPROM] devices
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Non-Volatile Memory (AREA)
- Semiconductor Memories (AREA)
Description
前述した説明は本発明の特定の実施形態を詳述し、特定のアレイのアーキテクチャを使用する本発明の実施形態について説明するものである。しかし、本発明は本願明細書に開示した実施形態に限定されたり、所定の例で使用した特定のアーキテクチャに限定されたりするものではない。本発明が、添付の特許請求の範囲の全範囲内においてその権利が保護されるべきであることが理解されよう。
Claims (12)
- 半導体基板面上に不揮発性メモリセルアレイを作る方法であって、
第1の方向に隔置され、かつ第1の方向に直交する第2の方向に伸びるシャロートレンチアイソレーション(STI)構造間に形成される第1のフローティングゲート部と基板との間にゲート誘電体層を設けて、前記基板面の両端にわたって前記第1のフローティングゲート部のアレイを形成するステップと、
マスキング部を前記第1のフローティングゲート部に対して自己位置合せを行うように、第1のフローティングゲート部によって覆われていない前記基板の領域にわたってマスキング部を形成するステップと、
第1のフローティングゲート部にわたって側壁スペーサを前記マスキング部の側面上に形成するステップと、
少なくとも一方向に前記側壁スペーサによって画定され、かつ前記第1のフローティングゲート部に接触する第2のフローティングゲート部を形成するステップであって、前記第2のフローティングゲート部のうちの1つが個々の第1のフローティングゲート部用に形成され、第1のフローティングゲート部に接触する個々の第2のフローティングゲート部の一部が第1の方向に対応する第1のフローティングゲート部の端縁部の方向へ延在するステップと、
前記側壁スペーサを除去し、それにより前記第1および第2のフローティングゲート部の表面を露出させるステップと、
を有する方法。 - 請求項1記載の方法において、
ゲート材の層を成膜し、その後前記マスキング部とは異なる誘電体材料の層を前記ゲート材上にわたって成膜し、その後同じパターンで前記誘電体材料とゲート材とのエッチングを行うことにより、前記第1のフローティングゲート部を形成して、誘電体材料によって覆われた第1のフローティングゲート部を有する構造を形成する方法。 - 請求項2記載の方法において、
誘電体材料によって覆われた第1のフローティングゲート部が存在している間、前記基板内へ不純物を注入して、誘電体材料によって覆われたフローティングゲート部によって覆われていない基板領域のみに不純物を注入するステップをさらに有する方法。 - 請求項2または3記載の方法において、
前記基板面上にわたってマスキング材を成膜することにより前記マスキング部を形成し、その後誘電体材料によって覆われた第1のフローティングゲート部上にわたって存在するマスキング材を除去する方法。 - 請求項4記載の方法において、
誘電体材料によって覆われた第1のフローティングゲート部上にわたって存在する前記マスキング材を除去した後、前記誘電体材料を除去する方法。 - 請求項1記載の方法において、
窒化シリコンの成膜とエッチバックとによって前記側壁スペーサを形成する方法。 - 請求項1記載の方法において、
ポリシリコンの成膜とエッチバックとによって前記第2のフローティングゲート部を形成する方法。 - 請求項1記載の方法において、
前記露出されたフローティングゲート部の表面に誘電体層を形成するステップと、
少なくとも一方向に前記フローティングゲートの両端にわたって延在し、かつ前記誘電体層と接触する導電性ゲートを形成するステップと、
をさらに有する方法。 - 請求項8記載の方法において、
前記誘電体層は、ONO層である方法。 - 請求項8記載の方法において、
前記導電性ゲートの最下端部の方が前記第2のフローティングゲート部の上端部よりも前記半導体基板面により近くなるように、前記導電性ゲートが前記半導体基板面へ向かって延在する方法。 - 請求項10記載の方法において、
前記導電性ゲートは、上方からかつ4つの側面に接して前記第2のフローティングゲート部を取り囲むように延在する方法。 - 請求項8記載の方法において、
前記導電性ゲート上に金属を成膜し、シリサイド層を生成するために上昇した温度までさらすステップをさらに有する方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/600,259 | 2003-06-20 | ||
US10/600,259 US7105406B2 (en) | 2003-06-20 | 2003-06-20 | Self aligned non-volatile memory cell and process for fabrication |
PCT/US2004/018545 WO2005001922A1 (en) | 2003-06-20 | 2004-06-09 | Floating gate structures with vertical projections |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2007521653A JP2007521653A (ja) | 2007-08-02 |
JP5072357B2 true JP5072357B2 (ja) | 2012-11-14 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2006517221A Expired - Fee Related JP5072357B2 (ja) | 2003-06-20 | 2004-06-09 | 不揮発性メモリセルアレイを作る方法 |
Country Status (7)
Country | Link |
---|---|
US (2) | US7105406B2 (ja) |
EP (1) | EP1636834B1 (ja) |
JP (1) | JP5072357B2 (ja) |
KR (2) | KR101140151B1 (ja) |
CN (2) | CN102034828B (ja) |
TW (1) | TWI257148B (ja) |
WO (1) | WO2005001922A1 (ja) |
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JP2007521653A (ja) | 2007-08-02 |
EP1636834A1 (en) | 2006-03-22 |
CN101019215B (zh) | 2010-12-08 |
WO2005001922A9 (en) | 2007-03-22 |
US20070076485A1 (en) | 2007-04-05 |
KR101234107B1 (ko) | 2013-02-19 |
CN101019215A (zh) | 2007-08-15 |
US7504686B2 (en) | 2009-03-17 |
WO2005001922A1 (en) | 2005-01-06 |
US7105406B2 (en) | 2006-09-12 |
EP1636834B1 (en) | 2014-02-26 |
KR101140151B1 (ko) | 2012-05-02 |
KR20060023167A (ko) | 2006-03-13 |
US20050003616A1 (en) | 2005-01-06 |
TWI257148B (en) | 2006-06-21 |
CN102034828A (zh) | 2011-04-27 |
KR20120034794A (ko) | 2012-04-12 |
CN102034828B (zh) | 2012-10-17 |
TW200509318A (en) | 2005-03-01 |
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