JP2023522485A - 薄膜バルク音波共振器及びその製造工程 - Google Patents
薄膜バルク音波共振器及びその製造工程 Download PDFInfo
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Abstract
Description
S1:音波反射構造が形成された、又は後で形成される基板に底部電極層を製造することで、音波反射構造を覆うステップと、
S2:底部電極層に圧電層を製造するステップと、
S3:圧電層の、音波反射構造の境界に対応する部位に対して脱分極処理を行うことで、脱分極部を形成するステップと、
S4:圧電層に上部電極層を製造するステップと、を含む。
S31:圧電層にハードマスクを堆積し又はフォトレジストをコーティングするステップと、
S32:前記ハードマスク又は前記フォトレジストをパターン化することで、圧電層の少なくとも音波反射構造の境界に対応する部位を露出させるステップと、
S33:圧電層の露出部位に対してイオン注入を行うステップと、
S34:ハードマスク又はフォトレジストを除去するステップと、を含む。
まず、図6aに示すように、基板601にシリコン層602を成長させ、基板601はSi、SiC、サファイア、スピネルなどであってもよく、好ましくは、PVDによって成長されたシリコン層の厚さは1.5~3μmである。図6bに示すように、フォトリソグラフィによって必要な共振器キャビティパターンをシリコン層602に生成する。図6cに示すように、キャビティに犠牲層603を成長させ、犠牲層材料はPSG(Pを添加したSiO2)であってもよく、犠牲層603に対して化学機械研磨を行う。シリコン層602及び犠牲層603に底部電極604を製造し、底部電極604の材料はモリブデンであってもよく、底部電極604を基礎として圧電層605を製造し、圧電層605は窒化アルミニウムであり、具体的な構造について、図6d及び6eを参照すればよい。
Claims (15)
- 薄膜バルク音波共振器であって、
音波反射構造が所在する基板の上部に設けられる底部電極層、圧電層及び上部電極層を含み、前記圧電層の、前記音波反射構造の境界に対応する部位に対して脱分極処理を行うことで、脱分極部を形成することを特徴とする薄膜バルク音波共振器。 - 前記脱分極部は部分的に脱分極されることを特徴とする請求項1に記載の薄膜バルク音波共振器。
- 前記脱分極部は全部脱分極されることを特徴とする請求項1に記載の薄膜バルク音波共振器。
- 前記脱分極部の、前記基板での投影領域は少なくとも前記音波反射構造の外部領域から前記音波反射構造内部まで跨ることを特徴とする請求項1~3の何れか一項に記載の薄膜バルク音波共振器。
- 前記脱分極部は前記圧電層に対して選択的脱分極処理を行って形成されることを特徴とする請求項1~3の何れか一項に記載の薄膜バルク音波共振器。
- 前記脱分極処理は、圧電層における圧電材料に対するイオン注入及びアニーリングを含むことを特徴とする請求項5に記載の薄膜バルク音波共振器。
- 前記共振器は同一基板に設けられる複数の共振器を含み、前記複数の共振器の間の領域が具備する圧電層は脱分極処理が行われることを特徴とする請求項1に記載の薄膜バルク音波共振器。
- 前記音波反射構造はキャビティであることを特徴とする請求項1に記載の薄膜バルク音波共振器。
- 前記音波反射構造はブラッグ反射構造であることを特徴とする請求項1に記載の薄膜バルク音波共振器。
- 薄膜バルク音波共振器の製造工程であって、
S1:音波反射構造が形成されたか、又は後で形成される基板に底部電極層を製造することで、前記音波反射構造を覆うステップと、
S2:前記底部電極層に圧電層を製造するステップと、
S3:前記圧電層の、前記音波反射構造の境界に対応する部位に対して脱分極処理を行うことで、脱分極部を形成するステップと、
S4:前記圧電層に上部電極層を製造するステップと、を含むことを特徴とする薄膜バルク音波共振器の製造工程。 - 前記ステップS3は具体的に、
S31:前記圧電層にハードマスクを堆積するか又はフォトレジストをコーティングするステップと、
S32:前記ハードマスク又は前記フォトレジストをパターン化することで、前記圧電層の少なくとも前記音波反射構造の境界に対応する部位を露出させるステップと、
S33:前記圧電層の露出部位に対してイオン注入を行うステップと、
S34:前記ハードマスク又はフォトレジストを除去するステップと、を含むことを特徴とする請求項10に記載の製造工程。 - 前記S33ステップは、イオン注入後、前記圧電層にアニーリング工程を付与するステップをさらに含むことを特徴とする請求項11に記載の製造工程。
- 前記S33ステップは具体的に、イオン注入が行われた圧電層材料のキュリー点が、前記イオン注入が行われた前記共振器の製造工程の最高工程温度より低くなるように、イオン注入過程における添加イオンの種類及び/又は濃度を制御するステップを含むことを特徴とする請求項11に記載の製造工程。
- 前記音波反射構造はキャビティ又はブラッグ反射構造であることを特徴とする請求項10~13の何れか一項に記載の製造工程。
- 薄膜バルク音波共振器であって、請求項10~14の何れか一項に記載の製造工程によって製造されることを特徴とする薄膜バルク音波共振器。
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PCT/CN2020/098557 WO2021248572A1 (zh) | 2020-06-09 | 2020-06-28 | 一种薄膜体声波谐振器及其制作工艺 |
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CN112260659B (zh) * | 2020-10-26 | 2022-02-01 | 武汉大学 | 一种高q值薄膜体声波谐振器及其制备方法 |
CN113965182B (zh) * | 2021-12-23 | 2022-04-01 | 深圳新声半导体有限公司 | 一种提高体声波滤波器制备良率的方法和结构 |
CN117013982B (zh) * | 2022-04-29 | 2024-08-27 | 锐石创芯(重庆)科技有限公司 | 体声波谐振器、滤波器、多工器及其制作方法 |
CN114826191B (zh) * | 2022-05-23 | 2023-11-07 | 武汉敏声新技术有限公司 | 一种薄膜体声波谐振器 |
CN116032236B (zh) * | 2023-02-15 | 2023-06-06 | 成都频岢微电子有限公司 | 一种体声波耳形通道谐振器 |
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