JP5290517B2 - メモリセル構造の製造方法 - Google Patents
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- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 239000001257 hydrogen Substances 0.000 claims description 51
- 229910052739 hydrogen Inorganic materials 0.000 claims description 51
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 33
- 230000008569 process Effects 0.000 claims description 21
- 239000000758 substrate Substances 0.000 claims description 19
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 17
- 125000006850 spacer group Chemical group 0.000 claims description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 239000004065 semiconductor Substances 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 15
- 238000003860 storage Methods 0.000 claims description 15
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 13
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 13
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229910000077 silane Inorganic materials 0.000 claims description 7
- 239000002243 precursor Substances 0.000 claims description 6
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 3
- 150000002831 nitrogen free-radicals Chemical class 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 229960001730 nitrous oxide Drugs 0.000 claims description 2
- 235000013842 nitrous oxide Nutrition 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 150000004767 nitrides Chemical class 0.000 description 76
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 150000002431 hydrogen Chemical class 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- -1 Silicon Oxide Nitride Chemical class 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 3
- 229920005591 polysilicon Polymers 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 1
- BUMGIEFFCMBQDG-UHFFFAOYSA-N dichlorosilicon Chemical compound Cl[Si]Cl BUMGIEFFCMBQDG-UHFFFAOYSA-N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010336 energy treatment Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
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- 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
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- H01L21/28158—Making the insulator
- H01L21/28167—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation
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- 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
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- H01L21/28008—Making conductor-insulator-semiconductor electrodes
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- H01L21/28158—Making the insulator
- H01L21/28167—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation
- H01L21/28202—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation in a nitrogen-containing ambient, e.g. nitride deposition, growth, oxynitridation, NH3 nitridation, N2O oxidation, thermal nitridation, RTN, plasma nitridation, RPN
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66833—Unipolar field-effect transistors with an insulated gate, i.e. MISFET with a charge trapping gate insulator, e.g. MNOS transistors
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Description
窒化物層において水素がかなりの量含まれることで、例えば、その後のプログラミングサイクル中、高エネルギー電子が窒化物層に注入されるときに悪影響を及ぼす。窒化物層において、これらの電子が窒素−水素結合及び/又はシリコン−水素結合を分解でき、水素原子(“水素ラジカル”)のかなりの数が遊離されるからである。窒化物層にこれら水素ラジカルが存在することで、窒化物層における電荷損失が発生され、結果としてメモリセルの閾電圧シフトのようなマイナス要因となり、予測不可能なメモリデバイス挙動を結果的に引き起こす。その上、窒化物層における電荷損失が、メモリセルのプログラミングデータ損失及び/又はプログラミング性能の損失を結果的に更に生じさせる。また、ONOスタックの上部層及び底部層のような隣接酸化物層内へも水素基が移動し得るので、デバイス特性の水準を更に低下し得る。これらマイナス要因が結果としてメモリデバイスの性能不良につながる。
Claims (6)
- メモリセル構造を製造する方法であって、
半導体基板を用意する工程と、
前記半導体基板上に第1シリコン酸化物層を形成する工程と、
シラン及び反応性窒素の組み合わせを含む前駆体を用いて、400℃〜650℃の温度でのCVDプロセスにより、前記第1シリコン酸化物層上に、電荷格納層を構成するシリコン窒化物層を形成する工程であって、前記反応性窒素は窒素ラジカルを含み、前記窒素ラジカルが前記シリコン窒化物層の水素含有量を減少させる工程と、
前記シリコン窒化物層上に第2シリコン酸化物層を形成する工程と、
前記第1シリコン酸化物層、前記シリコン窒化物層、および前記第2シリコン酸化物層を含み、両側にサイドウォールを備えるゲートスタックを、前記半導体基板のチャンネル上に形成する工程と、
前記ゲートスタックの前記サイドウォールに隣接して、400℃〜650℃の温度でのCVDプロセスにより、シラン及び反応性窒素の組み合わせを含む前駆体を用いて、スペーサを形成する工程とを備え、
前記スペーサは水素含有量が減少されたシリコン窒化物を含み、前記水素含有量が減少されることで、前記シリコン窒化物層により構成される前記電荷格納層における電荷損失が減少される、メモリセル構造の製造方法。 - 酸素雰囲気又は一酸化二窒素雰囲気により前記シリコン窒化物層をアニールする工程をさらに備える、請求項1記載のメモリセル構造の製造方法。
- 前記アニールが、900℃〜1000℃の範囲の温度で行なわれる、請求項2記載のメモリセル構造の製造方法。
- 前記第2シリコン酸化物層上にゲート層を形成する工程をさらに備える、請求項1記載のメモリセル構造の製造方法。
- 前記電荷格納層の水素含有量は、1.0at%未満である、請求項1記載のメモリセル構造の製造方法。
- 前記電荷格納層の水素含有量は、0at%〜0.5at%である、請求項1記載のメモリセル構造の製造方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US10/655,179 US6992370B1 (en) | 2003-09-04 | 2003-09-04 | Memory cell structure having nitride layer with reduced charge loss and method for fabricating same |
US10/655,179 | 2003-09-04 | ||
PCT/US2004/028329 WO2005027210A1 (en) | 2003-09-04 | 2004-08-31 | Memory cell structure having nitride layer with reduced charge loss and method for fabricating same |
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JP2007504668A JP2007504668A (ja) | 2007-03-01 |
JP5290517B2 true JP5290517B2 (ja) | 2013-09-18 |
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US (1) | US6992370B1 (ja) |
JP (1) | JP5290517B2 (ja) |
KR (1) | KR101217260B1 (ja) |
CN (1) | CN1853258A (ja) |
DE (1) | DE112004001510T5 (ja) |
GB (1) | GB2420226B (ja) |
TW (1) | TWI382529B (ja) |
WO (1) | WO2005027210A1 (ja) |
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EP1333473A1 (en) * | 2002-01-31 | 2003-08-06 | STMicroelectronics S.r.l. | Interpoly dielectric manufacturing process for non volatile semiconductor memories |
US7651910B2 (en) * | 2002-05-17 | 2010-01-26 | Micron Technology, Inc. | Methods of forming programmable memory devices |
JP2004095918A (ja) * | 2002-08-30 | 2004-03-25 | Fasl Japan Ltd | 半導体記憶装置及び半導体装置の製造方法 |
US6740605B1 (en) * | 2003-05-05 | 2004-05-25 | Advanced Micro Devices, Inc. | Process for reducing hydrogen contamination in dielectric materials in memory devices |
JP4139266B2 (ja) * | 2003-05-13 | 2008-08-27 | スパンション エルエルシー | 半導体メモリ用のメモリ素子を製造する方法 |
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2003
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- 2004-08-31 WO PCT/US2004/028329 patent/WO2005027210A1/en active Application Filing
- 2004-08-31 CN CNA2004800255363A patent/CN1853258A/zh active Pending
- 2004-08-31 GB GB0601284A patent/GB2420226B/en not_active Expired - Fee Related
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US6992370B1 (en) | 2006-01-31 |
GB2420226A (en) | 2006-05-17 |
GB0601284D0 (en) | 2006-03-01 |
TW200520208A (en) | 2005-06-16 |
KR20060086357A (ko) | 2006-07-31 |
CN1853258A (zh) | 2006-10-25 |
GB2420226B (en) | 2007-01-17 |
TWI382529B (zh) | 2013-01-11 |
DE112004001510T5 (de) | 2006-07-06 |
JP2007504668A (ja) | 2007-03-01 |
KR101217260B1 (ko) | 2012-12-31 |
WO2005027210A1 (en) | 2005-03-24 |
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