JP6248212B2 - Оnoスタックの形成方法 - Google Patents
Оnoスタックの形成方法 Download PDFInfo
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- JP6248212B2 JP6248212B2 JP2016568437A JP2016568437A JP6248212B2 JP 6248212 B2 JP6248212 B2 JP 6248212B2 JP 2016568437 A JP2016568437 A JP 2016568437A JP 2016568437 A JP2016568437 A JP 2016568437A JP 6248212 B2 JP6248212 B2 JP 6248212B2
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- 229910052760 oxygen Inorganic materials 0.000 claims description 23
- 150000004767 nitrides Chemical class 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 16
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- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 7
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- 229910052751 metal Inorganic materials 0.000 description 4
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- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 4
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- 238000000151 deposition Methods 0.000 description 3
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- 229910000449 hafnium oxide Inorganic materials 0.000 description 3
- KQHQLIAOAVMAOW-UHFFFAOYSA-N hafnium(4+) oxygen(2-) zirconium(4+) Chemical compound [O--].[O--].[O--].[O--].[Zr+4].[Hf+4] KQHQLIAOAVMAOW-UHFFFAOYSA-N 0.000 description 3
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- 229910052757 nitrogen Inorganic materials 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 3
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- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
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- 239000002131 composite material Substances 0.000 description 1
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- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- -1 phosphorus ions Chemical class 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
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- 229910000077 silane Inorganic materials 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
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- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 229910052726 zirconium Inorganic materials 0.000 description 1
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- 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
- H01L29/792—Field effect transistors with field effect produced by an insulated gate with charge trapping gate insulator, e.g. MNOS-memory transistors
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- Computer Hardware Design (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Semiconductor Memories (AREA)
- Non-Volatile Memory (AREA)
- Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
- Formation Of Insulating Films (AREA)
Description
Claims (16)
- ウェハ上に誘電体スタックを形成するステップであって、前記誘電体スタックは、ウェハ上のトンネル誘電体層と、電荷トラップ層と、該電荷トラップ層を覆うキャップ層とを含む、誘電体スタックの形成ステップと、
前記ウェハの第2の領域における前記誘電体スタックを同時に除去しつつ、前記ウェハの第1の領域に不揮発性メモリ(NVM)トランジスタの不揮発性(NV)ゲートスタックを形成するために前記誘電体スタックをパターニングするステップと、
前記NVゲートスタックの前記キャップ層の少なくとも第1の部分を同時に酸化して、ブロッキング酸化物層を形成し、且つ前記第2の領域における少なくとも1つの金属−酸化物−半導体(MOS)トランジスタのゲート酸化物層を形成するために、2段階のゲートの酸化プロセスを実行するステップと、を含み、
前記ゲート酸化プロセスの第1の酸化工程は、高速熱酸化(RTO)プロセスを含み、前記ゲート酸化プロセスの第2酸化工程は、ウェット・インサンチュ蒸気生成(ISSG)プロセスを含み、
前記少なくとも1つのMOSトランジスタの前記ゲート酸化物層は、前記2段階のゲート酸化プロセスの第1の酸化工程と第2の酸化工程の2つの工程で形成され、
前記ブロッキング酸化物層は、前記第2の酸化工程で形成される、方法。 - 前記2段階のゲート酸化プロセスを実行するステップの後に、前記NVゲートスタックの前記ブロッキング酸化物層の厚さと、前記少なくとも1つのMOSトランジスタの前記ゲート酸化物層との間の厚さの比は、おおよそ、1:2.33〜1:6.67の範囲内である、請求項1に記載の方法。
- 前記ゲート酸化プロセスの前記第2の酸化工程は、前記第1の酸化工程の後、直ぐに実行される、請求項1に記載の方法。
- 前記ゲート酸化プロセスの前記第1の酸化工程中、前記NVゲートスタックの前記キャップ層の前記少なくとも第1の部分は、化学量論的及び化学的の両方で実質的に変化しないままである、請求項1に記載の方法。
- 前記ゲート酸化プロセスの前記第1の酸化工程の後、前記少なくとも1つのMOSトランジスタの前記ゲート酸化物層は、第1の厚さに成長し、
前記ゲート酸化プロセスの前記第2の酸化工程中、前記ゲート酸化物層は、第2の厚さまで成長し続け、前記第2の厚さは前記第1の厚さよりも大きい、請求項3に記載の方法。 - 前記第1及び第2の酸化工程の少なくとも1つは、シングルウェハ処理チャンバ又はバッチウェハ処理チャンバ内で実行される、請求項1に記載の方法。
- 前記ゲート酸化プロセスの前記第1及び第2の酸化工程の完了後、前記NVMトランジスタの前記ブロッキング酸化物層はおおよそ30Å〜45Åの範囲内の厚さに達し、一方で、前記少なくとも1つのMOSトランジスタの前記ゲート酸化物層は、おおよそ105Å〜200Åの範囲内の前記第2の厚さに達する、請求項5に記載の方法。
- 前記誘電体スタックは、前記キャップ層の頂部に堆積される犠牲酸化物層をさらに備え、
前記キャップ層は、窒化物又は酸窒化物層を含み、前記第1の部分と第2の部分とに分けられ、
前記第2の部分は、前記第1の部分の上に堆積され、
前記NVゲートスタックの前記ブロッキング酸化物層は、前記キャップ層の少なくとも前記第1の部分を消費することで形成される、請求項1に記載の方法。 - 前記2段階のゲート酸化プロセスを実行するステップの前に、本方法は、
前記ウェハの表面上に残存する酸化物を同時に除去して、前記第2の領域の前記ウェハの前記表面を露出させながら、前記NVゲートスタックの前記キャップ層の前記犠牲酸化物層及び少なくとも前記第2の部分を除去するために、ゲート酸化物(GOX)前洗浄プロセスを実行するステップをさらに含み、
前記キャップ層の前記第2の部分は、前記キャップ層の前記第2の部分の除去を容易にするために、前記第1の部分に対して酸素リッチな組成を含む、請求項8に記載の方法。 - 前記ウェハ上に誘電体スタックを形成するステップの前に、本方法は、
前記NVMトランジスタのチャネルを形成するために、前記ウェハの前記第1の領域に、インジウムをおおよそ5×1011m−2〜1×1013cm−2の範囲内のドーズ量で注入するステップをさらに含む、請求項1に記載の方法。 - 前記ゲート酸化プロセスの前記第1及び第2の酸化工程は、ISSG処理チャンバ内で両方とも実行され、且つおおよそ800℃〜1100℃の範囲内の温度に曝され、
前記第1の酸化工程中には、酸素のみが前記ISSG処理チャンバへ導入され、
前記第2の酸化工程中には、酸素と水素の両方が、前記ISSG処理チャンバへ導入される、請求項1に記載の方法。 - 前記第1及び第2の酸化工程の両方はISSGプロセスであり、
前記2段階のゲート酸化プロセスを実行するステップにおける、前記第1の酸化工程の実行と前記第2の酸化工程の実行との間に、本方法は、
前記第1の酸化工程中に前記NVゲートスタックの前記キャップ層の前記第1の部分の一部を酸化することで形成された第1のブロッキング酸化物層のみを露出させるために開口部をパターニングするステップと、
前記NVゲートスタックにおける前記第1のブロッキング酸化物層を除去するステップと、をさらに含む、請求項1に記載の方法。 - ウェハを、複数の第1の領域と複数の第2の領域とに分けるステップと、
前記ウェハに誘電体スタックを形成するステップであって、前記誘電体スタックは、前記ウェハ上の底部の酸化物層と、多層の電荷トラップ膜と、該多層の電荷トラップ膜を覆う底部及び頂部の窒化物キャップ層と、頂部の犠牲酸化物層とを含む、誘電体スタックの形成ステップと、
各前記第2の領域における前記誘電体スタックを同時に除去しつつ、各前記第1の領域にシリコン-酸化物-窒化物-酸化物-シリコン(SONOS)トランジスタの不揮発性(NV)ゲートスタックを形成するために前記誘電体スタックをパターニングするステップと、
ドライRTOプロセス及びウェットラジカルISSGプロセスを含む2段階のゲート酸化プロセスを実行するステップと、
を含む方法であって、
前記ドライRTOプロセスは、各前記第2の領域に、少なくとも1つの金属−酸化物−半導体(MOS)トランジスタの第1のゲート酸化物層を形成し、
前記ウェットラジカルISSGプロセスは、少なくとも前記底部の窒化物のキャップ層を同時に酸化して、各前記第1の領域における前記NVゲートスタックのための頂部の酸化物層を形成するために、前記ドライRTOプロセスの後に直ぐに実行され、且つ各前記第2の領域における前記少なくとも1つの金属−酸化物−半導体(MOS)トランジスタの前記第1のゲート酸化物層上に酸化物層を形成し続け、該酸化物層の厚さを増やす、方法。 - 前記2段階のゲート酸化プロセスを実行するステップの後に、前記NVゲートスタックの頂部の酸化物層と前記少なくとも1つのMOSトランジスタの前記第1のゲート酸化物層との間の厚さの比は、おおよそ、1:2.33〜1:6.67の範囲内である、請求項13に記載の方法。
- 集積相補型金属-酸化物-半導体(CMOS)プロセスフローにおいてSONOSトランジスタのブロッキング酸化物層の厚さを制御するための方法であって、該方法は、
ウェハを、第1の領域と第2の領域とに分けるステップと、
前記第1の領域に少なくとも1つのSONOSトランジスタを形成するステップであって、各SONOSトランジスタは第1の実用厚さを有する前記ブロッキング酸化物層を含む、SONOSトランジスタの形成ステップと、
前記第2の領域に少なくとも1つのMOSトランジスタを形成するステップであって、該少なくとも1つのMOSトランジスタは、高電圧(HV)MOSトランジスタを含み、該HVMOSトランジスタは、第2の実用厚さを有するゲート酸化物層を含む、MOSトランジスタの形成ステップと、を含み、
前記少なくとも1つのSONOSトランジスタ及び前記少なくとも1つのMOSトランジスタは、同時に形成され、
前記SONOSトランジスタのそれぞれの前記ブロッキング酸化物層及び前記HVMOSトランジスタの前記ゲート酸化物層は、2段階の酸化プロセスにて同時に形成され、該酸化プロセスは、
前記HVMOSトランジスタの前記ゲート酸化物層を第1の厚さに成長させるためのドライRTOプロセスと、
前記少なくとも1つのSONOSトランジスタの前記ブロッキング酸化物層の厚さが前記第1の実用厚さに近い厚さになるまでブロッキング酸化物層を同時に形成し、且つ前記HVMOSトランジスタの前記ゲート酸化物層の上に酸化物層を第2の厚さまで成長させ続けるためのウェットラジカルISSGプロセスと、を含み、
前記第2の厚さは、前記第1の厚さよりも大きく、前記HVMOSトランジスタの前記第2の実用厚さに達する、方法。 - 前記少なくとも1つのSONOSトランジスタの前記ブロッキング酸化物層の前記第1の実用厚さは、おおよそ30Å〜45Åの範囲内であり、その一方で、前記HVMOSトランジスタの前記ゲート酸化物層の前記第2の実用厚さは、おおよそ105Å〜200Åの範囲内であり、前記ブロッキング酸化物層の前記第1の実用厚さと前記ゲート酸化物層の前記第2の実用厚さとの間の比は、おおよそ1:2.33〜1:6.67の範囲内である、請求項15に記載の方法。
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US10418373B2 (en) | 2019-09-17 |
WO2016144397A1 (en) | 2016-09-15 |
US9218978B1 (en) | 2015-12-22 |
US9793284B1 (en) | 2017-10-17 |
CN110246805A (zh) | 2019-09-17 |
TW201707147A (zh) | 2017-02-16 |
DE112015006291T5 (de) | 2017-11-30 |
JP2018041977A (ja) | 2018-03-15 |
CN106471615A (zh) | 2017-03-01 |
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