JP5934424B2 - 弾性波デバイスの製法 - Google Patents
弾性波デバイスの製法 Download PDFInfo
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- JP5934424B2 JP5934424B2 JP2015501444A JP2015501444A JP5934424B2 JP 5934424 B2 JP5934424 B2 JP 5934424B2 JP 2015501444 A JP2015501444 A JP 2015501444A JP 2015501444 A JP2015501444 A JP 2015501444A JP 5934424 B2 JP5934424 B2 JP 5934424B2
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Description
圧電基板と該圧電基板よりも低い熱膨張係数を持つ支持基板とを貼り合わせた複合基板であって、
前記支持基板は、同じ材料で作られた第1基板と第2基板とがブレードで剥離可能な強度で直接接合により接合され、前記第1基板のうち前記第2基板との接合面とは反対側の面で前記圧電基板と貼り合わされたものである。
(a)上述した複合基板を準備する工程と、
(b)前記複合基板のうち前記圧電基板の表面に弾性波デバイス用の電極を形成する工程と、
(c)ブレードで前記第1基板から前記第2基板を剥離して除去する工程と、
(d)前記複合基板をダイシングして弾性波デバイスを得る工程と、
を含むものである。
第1及び第2基板として、直径100mm、厚さ250μmのシリコン基板を2枚用意した。各シリコン基板は、両面が鏡面に仕上げられたものを用意した。各シリコン基板を洗浄して表面の汚れを取った後、ステンレス鋼製の真空チャンバーに導入した。チャンバー内を1×10-6Pa台の真空雰囲気に調節し、その中で各シリコン基板の表面にArイオンビームを180sec間照射した。次いで、各シリコン基板のビーム照射面を接触させるように重ね合わせた後、500kgfの荷重をかけて両シリコン基板を接合し、総厚み500μmの支持基板を得た。この支持基板のほかに、両面が鏡面に仕上げられた直径100mm、厚さ230μmのLT基板を圧電基板として用意した。そして、LT基板と支持基板とを再度洗浄し、真空チャンバーに投入した。チャンバー内を1×10-6Pa台の真空雰囲気に調節し、その中でLT基板の表面及び支持基板の表面(第1基板の表面)にArイオンビームを300sec照射した。次いで、LT基板のビーム照射面と支持基板のビーム照射面とを接触させるように重ね合わせた後、2000kgfの加重をかけて両基板を接合し、3層構造の複合基板を得た。
支持基板として直径100mm、厚さ250μmのシリコン基板1枚を用いた以外は、実施例1と同様にして複合基板を作製し、研磨前後の複合基板の反り量を測定したところ約60μmであった。また、100℃の加熱前後の反り量を測定したところ約1500μmであった。
表2に実施例1と比較例1の反り量の結果をまとめた。表1から明らかなように、実施例1では、比較例1と比べて、支持基板が厚いため、大幅な反り低減効果が認められた。
実施例1の研磨後の複合基板に弾性波デバイス(弾性表面波デバイス)用の電極のパターニングを施した後、SiとSiの接合部にブレードを挿入し、接合基板の剥離を行った。これにより、LT基板とSi基板(第1基板)とが接合された2層構造の複合基板と、単層のSi基板(第2基板)を得た。2層構造の複合基板の剥離面及び単層のSi基板の剥離面をAFM(原子間力顕微鏡)にて観察したところ、ウェハーの表面粗さRaは約0.4nmであり、研磨しなくても十分な表面状態であった。また、エネルギー分散型X線分光法(EDS)を用いて、先ほどの剥離面の元素分析を行ったところ、Si元素のほかにFe元素およびCr元素が検出された。Fe元素およびCr元素は、真空チャンバーに由来する元素である。これらの元素は、第1基板と第2基板とを直接接合する際に混入したものである。
Claims (2)
- (a)圧電基板よりも熱膨張係数の低い同じ材料で作られた第1及び第2基板を用意し、両基板の接合面に不活性ガスのイオンビームを照射した後、両基板の接合強度が厚さ100μmのブレードを挿入したときに剥離する強度となるように、真空中、常温で両基板を貼り合わせて支持基板を作製し、前記第1基板のうち前記第2基板との接合面とは反対側の面で前記圧電基板と貼り合わせることにより複合基板を作製する工程と、
(b)前記複合基板のうち前記圧電基板の表面に弾性波デバイス用の電極を形成する工程と、
(c)ブレードで前記第1基板から前記第2基板を剥離して除去する工程と、
(d)前記複合基板をダイシングして弾性波デバイスを得る工程と、
を含む弾性波デバイスの製法。 - 前記工程(a)では、前記支持基板を作製した後前記支持基板と前記圧電基板とを直接接合又は樹脂接合により接合する、
請求項1に記載の弾性波デバイスの製法。
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CN105027436A (zh) | 2015-11-04 |
CN105074868A (zh) | 2015-11-18 |
US20180053679A1 (en) | 2018-02-22 |
US20150328875A1 (en) | 2015-11-19 |
TWI609435B (zh) | 2017-12-21 |
DE112014000888T5 (de) | 2015-11-26 |
JPWO2014129432A1 (ja) | 2017-02-02 |
US9812345B2 (en) | 2017-11-07 |
KR20150118143A (ko) | 2015-10-21 |
CN105027436B (zh) | 2018-04-24 |
US9911639B2 (en) | 2018-03-06 |
EP2960925B1 (en) | 2018-04-25 |
TW201501213A (zh) | 2015-01-01 |
TWI635632B (zh) | 2018-09-11 |
KR20150120354A (ko) | 2015-10-27 |
EP2960925A1 (en) | 2015-12-30 |
KR102094026B1 (ko) | 2020-03-27 |
US20150380290A1 (en) | 2015-12-31 |
JPWO2014129433A1 (ja) | 2017-02-02 |
US10629470B2 (en) | 2020-04-21 |
EP2960925A4 (en) | 2016-06-22 |
WO2014129433A1 (ja) | 2014-08-28 |
TW201501378A (zh) | 2015-01-01 |
WO2014129432A1 (ja) | 2014-08-28 |
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