JP7447811B2 - 横方向に励起されたフィルムバルク音響共振器 - Google Patents
横方向に励起されたフィルムバルク音響共振器 Download PDFInfo
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- 239000000758 substrate Substances 0.000 claims description 56
- 238000000034 method Methods 0.000 claims description 38
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 27
- 239000004020 conductor Substances 0.000 claims description 23
- 235000012239 silicon dioxide Nutrition 0.000 claims description 14
- 239000000377 silicon dioxide Substances 0.000 claims description 13
- 239000013078 crystal Substances 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 6
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 4
- 239000010931 gold Substances 0.000 claims description 4
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- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 description 20
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 15
- 238000004891 communication Methods 0.000 description 10
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- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
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- 229910052681 coesite Inorganic materials 0.000 description 7
- 229910052906 cristobalite Inorganic materials 0.000 description 7
- 238000000151 deposition Methods 0.000 description 7
- 229910052682 stishovite Inorganic materials 0.000 description 7
- 238000010897 surface acoustic wave method Methods 0.000 description 7
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- 238000004088 simulation Methods 0.000 description 6
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- 229920002120 photoresistant polymer Polymers 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
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- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910002601 GaN Inorganic materials 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 229910003327 LiNbO3 Inorganic materials 0.000 description 1
- 229910012463 LiTaO3 Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- 238000004140 cleaning Methods 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
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- 238000002955 isolation Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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Description
図1は、横方向に励起されたフィルムバルク音響共振器(XBAR)100の簡略化された概略的上面図および直交断面図を示す。共振器100などのXBAR共振器は、バンドリジェクトフィルタ、バンドパスフィルタ、デュプレクサ、およびマルチプレクサを含むさまざまなRFフィルタで使用し得る。XBARは、周波数が3GHzを超える通信帯域のフィルタでの使用に特に適している。
図17は、XBARまたはXBARを組み込んだフィルタを作製するための方法1700の簡略化されたフローチャートである。方法1700は、基板および圧電材料のプレートを備えた1705で開始し、完成したXBARまたはフィルタを備えた1795で終了する。図17のフローチャートには、主要なプロセスステップのみが含まれている。さまざまな従来のプロセスステップ(例えば、表面処理、洗浄、検査、ベーキング、アニーリング、監視、試験など)は、図17に示されるステップの前、間、後、および最中に実行され得る。
この説明全体を通して、示される実施形態および実施例は、開示または請求される装置および手順に対する制限ではなく、模範と見なされるべきである。本明細書に提示される例の多くは、方法動作またはシステム要素の特定の組み合わせを含むが、それらの行為およびそれらの要素は、同じ目的を達成するために他の方法で組み合わせることができることを理解されたい。フローチャートに関しては、追加のより少ないステップをとることができ、示されているステップを組み合わせて、またはさらに改良して、本明細書に記載の方法を達成することができる。一実施形態に関連してのみ論じられる動作、要素、および特徴は、他の実施形態における同様の役割から除外されることを意図するものではない。
Claims (24)
- ベースと、少なくとも二酸化シリコン又は窒化シリコンを含む中間層とを含む基板と、
前記中間層に設けられた1つまたは複数のキャビティと、
それぞれの前記キャビティにまたがる、1つまたは複数のダイアフラムと、前記ダイアフラムに対応する部分を少なくとも除く部分が直接前記中間層に取り付けられる、単結晶圧電プレートと、
前記単結晶圧電プレートに形成された導体パターンであって、前記導体パターンは、シャント共振器および直列共振器を含むそれぞれ複数の音響共振器の複数のインターディジタル変換器(IDT)を含み、複数の前記IDTの各々のインターリーブされたフィンガーは、前記1つまたは複数のダイアフラムのそれぞれのダイアフラム上に配置される、導体パターンと、
前記シャント共振器の前記IDTのフィンガー間の第1の厚さを有する第1の誘電体層と、
前記直列共振器の前記IDTのフィンガー間の第2の厚さを有する第2の誘電体層と、
を含むフィルタデバイスであって、
前記単結晶圧電プレートおよび複数の全ての前記IDTは、前記IDTに適用される無線周波数信号がそれぞれのダイアフラムの内部でそれぞれの1次剪断音響モードを励起するように構成され、
前記第1の厚さは、前記第2の厚さよりも大きい、
フィルタデバイス。 - 前記直列共振器の共振周波数と前記シャント共振器の共振周波数との差は、前記第1の厚さと前記第2の厚さとの差によって部分的に決まる、請求項1に記載のフィルタデバイス。
- 前記第1の厚さは500nm以下であり、前記第2の厚さは0以上である、請求項1に記載のフィルタデバイス。
- 励起された1次剪断音響モードの各々の音響エネルギーの流れの方向は、前記単結晶圧電プレートの表面に実質的に垂直である、請求項1に記載のフィルタデバイス。
- 前記単結晶圧電プレートの前面と背面との間の厚さは、200nm以上1000nm以下である、請求項1に記載のフィルタデバイス。
- 複数の前記IDTの各々は、前記単結晶圧電プレートの厚さの2倍以上25倍以下のそれぞれのピッチを有する、請求項1に記載のフィルタデバイス。
- 前記第1の誘電体層および前記第2の誘電体層は、少なくとも1つの二酸化シリコンまたは窒化シリコンを含む、請求項1に記載のフィルタデバイス。
- 前記導体パターンは、アルミニウム、アルミニウム合金、銅、銅合金、ベリリウム、金のうちの1つを含む、請求項1に記載のフィルタデバイス。
- 前記単結晶圧電プレートのz軸は、前記単結晶圧電プレートの前面および背面に垂直である、請求項1に記載のフィルタデバイス。
- 複数の全ての前記IDTのフィンガーは、前記単結晶圧電プレートのx軸に平行である、請求項9に記載のフィルタデバイス。
- 複数の共振器は2つ以上のシャント共振器を含み、
前記第1の誘電体層は、2つ以上の全ての前記シャント共振器のフィンガー間に配置される、
請求項1に記載のフィルタデバイス。 - 複数の共振器は2つ以上の直列共振器を含み、
前記第2の誘電体層は、2つ以上の全ての前記直列共振器のフィンガー間に配置される、
請求項1に記載のフィルタデバイス。 - 基板に取り付けられた圧電プレート上にフィルタデバイスを製造する方法であって、
前記圧電プレートのそれぞれの部分が、キャビティ上に懸架された1つまたは複数のダイアフラムを形成するように、前記基板が含むベースと、前記ベースの上であって少なくとも二酸化シリコン又は窒化シリコンを含む中間層のうち、前記中間層に1つまたは複数のキャビティを形成することと、
シャント共振器および直列共振器を含むそれぞれ複数の共振器の複数のインターディジタル変換器(IDT)を含む導体パターンであって、複数のIDTの各々のインターリーブされたフィンガーが、1つまたは複数のダイアフラムのそれぞれのダイアフラム上に配置されている、導体パターンを形成することと、
第1の厚さを有する第1の誘電体層であって、前記シャント共振器のIDTのフィンガー間の第1の誘電体層を形成することと、
第2の厚さを有する第2の誘電体層であって、前記直列共振器のIDTのフィンガー間の第2の誘電体層を形成することと、
を含み、
前記圧電プレートおよび複数の全ての前記IDTは、前記IDTに適用される無線周波数信号がそれぞれのダイアフラムにおいてそれぞれの1次剪断音響モードを励起するように構成され、
前記第1の厚さは、前記第2の厚さよりも大きい、
方法。 - 前記直列共振器の共振周波数と前記シャント共振器の共振周波数との差に応じて、前記第1の厚さと前記第2の厚さとの差が生じるように前記第1の誘電体層及び前記第2の誘電体層を形成する、請求項13に記載の方法。
- 前記第1の厚さは500nm以下であり、前記第2の厚さは0以上である、請求項14に記載の方法。
- 励起された1次剪断音響モードの各々の音響エネルギーの流れの方向は、前記圧電プレートの表面に実質的に垂直である、請求項13に記載の方法。
- 前記圧電プレートの前面と背面との間の厚さは、200nm以上1000nm以下である、請求項13に記載の方法。
- 複数の前記IDTの各々は、前記圧電プレートの厚さの2倍以上25倍以下のそれぞれのピッチを有する、請求項13に記載の方法。
- 前記第1の誘電体層および前記第2の誘電体層は、少なくとも1つの二酸化シリコンまたは窒化シリコンを含む、請求項13に記載の方法。
- 前記導体パターンは、アルミニウム、アルミニウム合金、銅、銅合金、ベリリウム、金のうちの1つを含む、請求項13に記載の方法。
- 前記圧電プレートは、前記圧電プレートの前面および背面に垂直であるz軸を有している、請求項13に記載の方法。
- 複数の全ての前記IDTのフィンガーは、前記圧電プレートのx軸に平行になるように形成されている、請求項21に記載の方法。
- 複数の共振器は2つ以上のシャント共振器を含み、
前記第1の誘電体層は、2つ以上の全ての前記シャント共振器のフィンガー間に配置される、
請求項13に記載の方法。 - 複数の共振器は2つ以上の直列共振器を含み、
前記第2の誘電体層は、2つ以上の全ての前記直列共振器のフィンガー間に配置される、
請求項13に記載の方法。
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US10491192B1 (en) | 2019-11-26 |
JP2021527344A (ja) | 2021-10-11 |
CN112352382A (zh) | 2021-02-09 |
TW202019087A (zh) | 2020-05-16 |
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