JP2022068857A - 特定共振周波数を有する薄膜バルク音響共振装置を製造する方法 - Google Patents
特定共振周波数を有する薄膜バルク音響共振装置を製造する方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 38
- 239000010409 thin film Substances 0.000 claims description 40
- 239000000758 substrate Substances 0.000 claims description 16
- 239000010931 gold Substances 0.000 claims description 14
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 8
- 229910052737 gold Inorganic materials 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052451 lead zirconate titanate Inorganic materials 0.000 claims description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 4
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 claims description 4
- 239000011540 sensing material Substances 0.000 claims description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims 2
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- 235000012431 wafers Nutrition 0.000 description 6
- 238000001514 detection method Methods 0.000 description 2
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- 238000009413 insulation Methods 0.000 description 2
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
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- 230000035945 sensitivity Effects 0.000 description 1
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- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
- H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
- H03H9/171—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator implemented with thin-film techniques, i.e. of the film bulk acoustic resonator [FBAR] type
- H03H9/172—Means for mounting on a substrate, i.e. means constituting the material interface confining the waves to a volume
- H03H9/173—Air-gaps
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- H03H9/02015—Characteristics of piezoelectric layers, e.g. cutting angles
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- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02015—Characteristics of piezoelectric layers, e.g. cutting angles
- H03H9/02031—Characteristics of piezoelectric layers, e.g. cutting angles consisting of ceramic
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- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
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- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02047—Treatment of substrates
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/13—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
- H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
- H03H9/176—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator consisting of ceramic material
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- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/02—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks
- H03H2003/021—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks the resonators or networks being of the air-gap type
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- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/02—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks
- H03H2003/023—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks the resonators or networks being of the membrane type
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- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/02—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks
- H03H3/04—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks for obtaining desired frequency or temperature coefficient
- H03H2003/0414—Resonance frequency
- H03H2003/0421—Modification of the thickness of an element
- H03H2003/0428—Modification of the thickness of an element of an electrode
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- H03—ELECTRONIC CIRCUITRY
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- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/02—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks
- H03H3/04—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks for obtaining desired frequency or temperature coefficient
- H03H2003/0414—Resonance frequency
- H03H2003/0421—Modification of the thickness of an element
- H03H2003/0442—Modification of the thickness of an element of a non-piezoelectric layer
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
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Abstract
Description
10 基板
11 エアギャップ
12 第一絶縁層
13 第二絶縁層
14 第二圧電材料層
15 下部電極
16 第一圧電材料層
17 上部電極
18 共振周波数決定金属層
Claims (10)
- 特定共振周波数を有する薄膜バルク音響共振装置を製造する方法であって、
上部電極を提供する工程と、
下部電極を提供する工程と、
前記上部電極と前記下部電極との間に第一圧電材料層を配置する工程と、
前記上部電極に共振周波数決定金属層を配置する工程であって、前記共振周波数決定金属層は、厚さを有し、前記薄膜バルク音響共振装置の共振周波数と前記厚さとの間に曲線関係を形成し、前記厚さが線形に変化すると、前記共振周波数が非線形に変化することを特徴とする方法。 - 前記薄膜バルク音響共振装置は、第一絶縁層、第二絶縁層、第二圧電材料層及び上部電極を更に含み、
前記第一絶縁層は、前記基板に配置され、
前記第二絶縁層は、前記第一絶縁層に配置され、
前記第一圧電材料層は、前記第二絶縁層に配置され、
前記第二圧電材料層は、前記上部電極と前記下部電極との間に配置され、
前記第一絶縁層と前記基板との間には、エアギャップがあり、
前記エアギャップの内部は、真空状態を示すことを特徴とする請求項1に記載の方法。 - 前記基板は、シリコンを含み、
前記第一絶縁層は、窒化ケイ素を含み、
前記第二絶縁層は、二酸化ケイ素を含み、
前記上部電極及び前記下部電極は、モリブデンを含み、
前記第一圧電材料層及び前記第二圧電材料層は、窒化アルミニウム又はチタン酸ジルコン酸鉛を含み、
前記共振周波数決定金属層は、金(Au)を含むことを特徴とする請求項2に記載の方法。 - 前記厚さは、0.05μm~0.15μmであり、
前記エアギャップの深さは3μmであり、
前記第一絶縁層、前記第二絶縁層、前記第二圧電材料層、前記上部電極及び前記下部電極の厚さは、すべて0.2μmであり、
前記第一圧電材料層の厚さは、1μmであることを特徴とする請求項2に記載の方法。 - 前記基板、前記第一絶縁層、前記第二絶縁層、前記第二圧電材料層、前記下部電極及び前記第一圧電材料層は、第一シリンダを形成し、
前記第一シリンダは、第一直径が200μmであり、
前記エアギャップは、第二シリンダを形成し、
前記第二シリンダは、第二直径が140μmであり、
前記共振周波数決定金属層及び前記上部電極は、第三シリンダを形成し、
前記第三シリンダは、第三直径が100μmであることを特徴とする請求項4に記載の方法。 - 前記共振周波数決定金属層の厚さが0.1μmから0.15μmに増加すると、前記薄膜バルク音響共振装置の前記共振周波数が増加した第一差値が21kHzであり、
前記共振周波数決定金属層の厚さが0.05μmから0.1μmに増加すると、前記薄膜バルク音響共振装置の前記共振周波数が増加した第二差値が0.48GHzであり、
前記共振周波数決定金属層は、感知材料に接続され、前記感知材料は、前記薄膜バルク音響共振装置の前記共振周波数を感知するために使用されることを特徴とする請求項4に記載の方法。 - 前記厚さが第一範囲にあると、前記曲線関係を第一曲線セグメントに定義し、前記厚さが第二範囲にあると、前記曲線関係を第二曲線セグメントに定義し、第一曲線セグメントの第一勾配を第二曲線セグメントの第二勾配よりも大きくなるようにする工程と、
前記特定共振周波数に対応する前記厚さが前記第一範囲又は前記第二範囲にあることに応じて、特定の厚さを選択して前記薄膜バルク音響共振装置を製造する工程と、を更に含むことを特徴とする請求項4に記載の方法。 - 特定共振周波数を有する薄膜バルク音響共振装置を製造する方法であって、
上部電極を提供する工程と、
下部電極を提供する工程と、
前記上部電極と前記下部電極との間に第一圧電材料層を配置する工程と、
前記上部電極に共振周波数決定金属層を配置する工程であって、前記共振周波数決定金属層は、厚さを有し、前記薄膜バルク音響共振装置の共振周波数と前記厚さとの間に曲線関係を形成し、前記厚さが第一範囲にあると、前記曲線関係を第一曲線セグメントに定義し、前記厚さが第二範囲にあると、前記曲線関係を第二曲線セグメントに定義し、第一曲線セグメントの第一勾配を第二曲線セグメントの第二勾配よりも大きくなるようにする工程と、
前記特定共振周波数に対応する前記厚さが前記第一範囲又は前記第二範囲にあることに応じて、特定の厚さを選択して前記薄膜バルク音響共振装置を製造する工程と、を含むことを特徴とする方法。 - 前記共振周波数決定金属層の前記厚さは、0.05μm~0.15μmであり、
前記薄膜バルク音響共振装置は、基板、第一絶縁層、第二絶縁層及び第二圧電材料層を更に含み、
前記第一絶縁層は、前記基板に配置され、
前記第二絶縁層は、前記第一絶縁層に配置され、
前記第二圧電材料層は、前記第二絶縁層に配置され、
前記下部電極は、前記第二圧電材料層に配置され、
前記第一絶縁層と前記基板との間には、エアギャップがあり、
前記エアギャップの内部は、真空状態を示すことを特徴とする請求項8に記載の方法。 - 前記基板は、シリコンを含み、
前記第一絶縁層は、窒化ケイ素を含み、
前記第二絶縁層は、二酸化ケイ素を含み、
前記上部電極及び前記下部電極は、モリブデンを含み、
前記第一圧電材料層及び前記第二圧電材料層は、窒化アルミニウム又はチタン酸ジルコン酸鉛を含み、
前記共振周波数決定金属層は、金(Au)を含むことを特徴とする請求項9に記載の方法。
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CN114389560A (zh) | 2022-04-22 |
DE102021127486A1 (de) | 2022-04-28 |
TW202218326A (zh) | 2022-05-01 |
US20220131514A1 (en) | 2022-04-28 |
TWI784331B (zh) | 2022-11-21 |
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