JP7200199B2 - 単結晶圧電層、およびそのような層を含むマイクロエレクトロニクスデバイス、光子デバイスまたは光学デバイスの作製方法 - Google Patents
単結晶圧電層、およびそのような層を含むマイクロエレクトロニクスデバイス、光子デバイスまたは光学デバイスの作製方法 Download PDFInfo
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- 150000001875 compounds Chemical class 0.000 claims description 4
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- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 3
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 2
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Description
1つは、「表面音響波」(SAW)フィルタであり、
もう1つは、「バルク音響波」(BAW)フィルタおよび共振器である。
これらの技術の総説については、W. SteichenおよびS. Ballandras, "Composants acoustiques utilises pour le filtrage - Revue des differentes technologies" (Acoustic components used for filtering - Review of different technologies), Techniques de l' Ingenieur, E2000, 2008に掲載されている。
本発明は、
圧電材料のドナー基板を供給する工程と、
受入基板を供給する工程と、
「起原層」と呼ばれる層を、前記ドナー基板から受入基板に移送する工程と、
単結晶圧電層の所要厚が得られるまで、起原層上に圧電材料のエピタキシを実装する工程と、
を含むことを特徴とする、単結晶圧電層の層作製方法を開示するものである。
一実施形態によれば、起原層の移送は、以下の工程:
移送対象となる起原層が画定されるようにドナー基板内に脆化ゾーンを形成する工程と、
移送対象となる起原層が接合界面にあるように、ドナー基板を受入基板上に接合する工程と、
受入基板上に起原層が移送されるように脆化ゾーンに沿ってドナー基板を分離させる工程と、を含む。
情報提供を目的に、起原層とエピタキシャル層の厚さの組み合わせを、下表に示す。
層10を特徴付けているのは、特性の異なる以下の2つの部分が存在することである。
起原層に対応する受入基板110との界面にある第1の部分102と、
エピタキシャル層に対応する第1の部分102から延在し、第1の部分とは異なる結晶品質を有する第2の部分(103)であって、エピタキシ工程中に(特に、起原層上で品質向上を得ることを目的に)、前記品質が調節可能であり、場合によっては最適化され、且つ/あるいは、組成が異なるために(特にエピタキシの最中に不純物が導入された場合)、エピタキシャル層上に特定の特性が付与される可能性のある、第2の部分。
Claims (10)
- 単結晶圧電層(10)の層の作製方法であって、
圧電材料のドナー基板(100)を供給する工程と、
受入基板(110)を供給する工程と、
前記圧電材料の「起原層」(102)と呼ばれる層を、前記ドナー基板(100)から前記受入基板(110)に移送する工程と、
前記単結晶圧電層(10)の所要厚が得られるまで、前記起原層(102)上に前記圧電材料のエピタキシを実装する工程と、
を含み、
前記圧電材料が、石英、ならびに式LiXO 3 (式中、Xは、ニオブおよびタンタルから選択される)を有する化合物から選択され、
前記受入基板が半導体材料製であり、且つ前記起原層と前記受入基板との間に、多結晶シリコン、非晶質シリコンおよび多孔質シリコンから選択される少なくとも1種の材料で形成されたトラップリッチ層を挟持してなることを特徴とする、作製方法。 - 前記起原層(102)の移送が、以下の工程:
移送対象となる前記起原層(102)が画定されるように前記ドナー基板内に脆化ゾーン(101)を形成する工程と、
移送対象となる前記起原層(102)が接合界面にあるように、前記ドナー基板(100)を前記受入基板(110)上に接合する工程と、
前記受入基板(110)上に前記起原層(102)が移送されるように脆化ゾーン(101)に沿って前記ドナー基板(100)を分離させる工程と、
を含む、請求項1に記載の作製方法。 - 前記ドナー基板(100)へのイオン注入によって前記脆化ゾーン(101)が形成される、請求項2に記載の作製方法。
- 前記起原層(102)の厚さが2μm未満である、請求項1~3のいずれか一項に記載の作製方法。
- 前記エピタキシを実装する工程の前に、前記受入基板(110)上に移送された前記起原層(102)の厚さの一部が除去される、請求項1~4のいずれか一項に記載の作製方法。
- 前記エピタキシを実装する工程の終了時に、前記単結晶圧電層(10)の厚さが0.2~20μmになる、請求項1~5のいずれか一項に記載の作製方法。
- 少なくとも1つの電気絶縁層および/または少なくとも1つの電気伝導層が、前記受入基板と前記起原層との間の界面上に形成される、請求項1~6のいずれか一項に記載の作製方法。
- 受入基板(110)上に単結晶圧電層(10)を含む、マイクロエレクトロニクスデバイス、光子デバイスまたは光学装置用の基板の製造方法であって、請求項1~7のいずれか一項に記載の作製方法を用いた前記単結晶圧電層(10)の作製を含むことを特徴とする、基板の製造方法。
- 単結晶圧電層(10)に対向する2つの主面上に電極(12、13)を配設する工程を含む、バルク音響波デバイスの製造方法であって、請求項1~7のいずれか一項に記載の作製方法を用いた前記単結晶圧電層(10)の作製を含むことを特徴とする、製造方法。
- 単結晶圧電層(10)の表面上に相互に嵌合された2つの電極(12、13)を形成する工程を含む、表面音響波デバイスの製造方法であって、請求項1~7のいずれか一項に記載の作製方法により前記単結晶圧電層(10)を作製する工程を含むことを特徴とする、製造方法。
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