JP2020522877A - ワードライン抵抗を低下させる方法 - Google Patents
ワードライン抵抗を低下させる方法 Download PDFInfo
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- JP2020522877A JP2020522877A JP2019557809A JP2019557809A JP2020522877A JP 2020522877 A JP2020522877 A JP 2020522877A JP 2019557809 A JP2019557809 A JP 2019557809A JP 2019557809 A JP2019557809 A JP 2019557809A JP 2020522877 A JP2020522877 A JP 2020522877A
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- liner
- layer
- substrate
- polysilicon layer
- tungsten
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- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims abstract description 41
- 229920005591 polysilicon Polymers 0.000 claims abstract description 41
- 229910052751 metal Inorganic materials 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 32
- 239000000758 substrate Substances 0.000 claims description 55
- 229910052721 tungsten Inorganic materials 0.000 claims description 37
- 239000010937 tungsten Substances 0.000 claims description 37
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 36
- 238000000151 deposition Methods 0.000 claims description 18
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 238000003672 processing method Methods 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
- H10B43/20—EEPROM devices comprising charge-trapping gate insulators characterised by three-dimensional arrangements, e.g. with cells on different height levels
- H10B43/23—EEPROM devices comprising charge-trapping gate insulators characterised by three-dimensional arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels
- H10B43/27—EEPROM devices comprising charge-trapping gate insulators characterised by three-dimensional arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels the channels comprising vertical portions, e.g. U-shaped channels
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C8/00—Arrangements for selecting an address in a digital store
- G11C8/14—Word line organisation; Word line lay-out
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Abstract
Description
Claims (15)
- 基板表面に、間にギャップを有する複数の離間された酸化物層と、前記離間された酸化物層の間の前記ギャップ内に付与されたポリシリコン層とを、提供することと、
前記離間された酸化物層の表面下のある深さまで前記ポリシリコン層に凹部形成することと、
前記離間された酸化物層の上にライナーを形成し、凹部形成された前記ポリシリコン層の上にはライナーを形成しないことと、
ワードラインを形成するため、前記ライナー上の前記ギャップ内に金属層を堆積することと、
を含む処理方法。 - 基板表面に、間にギャップを有する複数の離間された酸化物層と、前記離間された酸化物層の間の前記ギャップ内に付与されたポリシリコン層とを、提供することと、
前記離間された酸化物層の表面下のある深さまで前記ポリシリコン層に凹部形成することと、
前記離間された酸化物層と凹部形成された前記ポリシリコン層の上にライナーを形成することと、
ワードラインを形成するため、前記ライナー上の前記ギャップ内に金属層を堆積することと、
前記離間された酸化物層から前記ライナーをエッチングすることと、
を含む処理方法。 - 前記金属層がタングステンを含む、請求項1又は2に記載の方法。
- 前記金属層は基本的にタングステンからなる、請求項3に記載の方法。
- 前記金属層を堆積させることが、前記基板をタングステン前駆体と反応物質に曝露することを含む、請求項4に記載の方法。
- 前記タングステン前駆体は、WF6、WCl6又はWCl5のうちの一又は複数を含み、前記反応物質はH2を含む、請求項5に記載の方法。
- 前記ライナーは、TiN、TiSiN、TiAlN、Al2O3又はTaNのうちの一又は複数を含む、請求項1又は2に記載の方法。
- 前記ライナーは、約20Åから約50Åの範囲の厚みを有する、請求項7に記載の方法。
- 前記ライナーを形成することは、チタン前駆体と窒素反応物質への順次曝露を含む、請求項7に記載の方法。
- 前記チタン前駆体はTiCl4を含み、前記反応物質はNH3を含む、請求項9に記載の方法。
- 50より多くのワードラインがある、請求項1又は2に記載の方法。
- 前記ポリシリコン層に凹部形成することは、HF、CFx、HCl、Cl2、HBr、Br2又はH2のうちの一又は複数を含むエッチャントに前記基板を曝露することを含む、請求項1又は2に記載の方法。
- 前記ポリシリコン層に凹部形成することは、プラズマへの曝露を含む、請求項12に記載の方法。
- 前記金属層は、前記離間された酸化物層と実質的に同一面をなす、請求項1又は2に記載の方法。
- 前記金属層を堆積することは、WF6、WCl6又はWCl5のうちの一又は複数を含む前駆体に、前記基板を曝露することを含み、反応物質はH2を含む、請求項14に記載の方法。
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