WO2013105634A1 - 熱酸化異種複合基板及びその製造方法 - Google Patents
熱酸化異種複合基板及びその製造方法 Download PDFInfo
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- H—ELECTRICITY
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/60—Formation of materials, e.g. in the shape of layers or pillars of insulating materials
- H10P14/63—Formation of materials, e.g. in the shape of layers or pillars of insulating materials characterised by the formation processes
- H10P14/6302—Non-deposition formation processes
- H10P14/6304—Formation by oxidation, e.g. oxidation of the substrate
- H10P14/6306—Formation by oxidation, e.g. oxidation of the substrate of the semiconductor materials
- H10P14/6308—Formation by oxidation, e.g. oxidation of the substrate of the semiconductor materials of Group IV semiconductors
- H10P14/6309—Formation by oxidation, e.g. oxidation of the substrate of the semiconductor materials of Group IV semiconductors of silicon in uncombined form, i.e. pure silicon
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
- H10D30/6758—Thin-film transistors [TFT] characterised by the insulating substrates
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
- H10D62/10—Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
- H10D62/113—Isolations within a component, i.e. internal isolations
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/60—Formation of materials, e.g. in the shape of layers or pillars of insulating materials
- H10P14/63—Formation of materials, e.g. in the shape of layers or pillars of insulating materials characterised by the formation processes
- H10P14/6302—Non-deposition formation processes
- H10P14/6322—Formation by thermal treatments
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- H—ELECTRICITY
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P90/00—Preparation of wafers not covered by a single main group of this subclass, e.g. wafer reinforcement
- H10P90/19—Preparing inhomogeneous wafers
- H10P90/1904—Preparing vertically inhomogeneous wafers
- H10P90/1906—Preparing SOI wafers
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- H10P90/00—Preparation of wafers not covered by a single main group of this subclass, e.g. wafer reinforcement
- H10P90/19—Preparing inhomogeneous wafers
- H10P90/1904—Preparing vertically inhomogeneous wafers
- H10P90/1906—Preparing SOI wafers
- H10P90/1914—Preparing SOI wafers using bonding
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P95/00—Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
- H10P95/90—Thermal treatments, e.g. annealing or sintering
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- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W10/00—Isolation regions in semiconductor bodies between components of integrated devices
- H10W10/10—Isolation regions comprising dielectric materials
- H10W10/181—Semiconductor-on-insulator [SOI] isolation regions, e.g. buried oxide regions of SOI wafers
Definitions
- the present invention relates to a thermally oxidized heterogeneous composite substrate obtained by thermally oxidizing a heterogeneous composite substrate in which a single crystal silicon film is formed on a handle substrate made of glass, quartz, sapphire or the like, and a method for manufacturing the same.
- Silicon on insulator (SOI) wafers are becoming widely used to reduce parasitic capacitance and measure device speed.
- SOI wafers wafers in which handle wafers of silicon on quartz (SOQ) and silicon on sapphire (SOS) are made of an insulating transparent wafer are attracting attention.
- SOQ is expected to be applied to optoelectronics utilizing the high transparency of quartz, or to high frequency devices utilizing low dielectric loss. Since SOS has a handle wafer made of sapphire, it has high thermal conductivity that cannot be obtained with quartz in addition to high transparency and low dielectric loss, so it is expected to be applied to high-frequency devices that generate heat. .
- bonded wafers made of different materials are concerned about defects induced during the process.
- a normal device process includes high-temperature processing exceeding 850 ° C. for forming a gate oxide film.
- dissimilar composite substrates the silicon thin film is subjected to strong compressive and tensile stresses by such a high temperature process, and various defects (such as minute cracks) may occur. is there.
- the heterogeneous composite substrate has a large difference in expansion coefficient between a support substrate called a handle substrate and an upper silicon thin film, which is an essential problem of the heterogeneous composite substrate.
- the present invention has been made in view of the above circumstances, and a thermally oxidized heterogeneous composite substrate in which defects such as microcracks are reduced as much as possible after performing high-temperature processing exceeding 850 ° C. in order to form an oxide film. And it aims at providing the manufacturing method.
- an insulating transparent wafer (quartz, glass, sapphire, etc.) to which a silicon thin film has been transferred is subjected to an intermediate process before being subjected to a high temperature process exceeding 850 ° C. It has been found that it is effective to add heat treatment to be called heat treatment and to set the temperature of this intermediate heat treatment to 650 ° C. or higher and 850 ° C. or lower.
- this intermediate heat treatment is a treatment for reducing defects that appear due to a high-temperature treatment exceeding 850 ° C. by interposing an intermediate heat treatment (650 ° C. or higher and 850 ° C. or lower). It can be said that the localized stress is averaged over the entire wafer surface. The cause of the localized stress is presumed to be the distortion and roughness of the material of the handle substrate, non-uniformity in the bonding process, and the like. In addition, this intermediate heat treatment sufficiently increases the bonding strength at the bonding interface before reaching the high temperature processing temperature, and does not cause peeling or misalignment even when the silicon thin film is subjected to strong stress. It is. Then, after the intermediate heat treatment, the number of defects after oxidation can be reduced by performing a high temperature treatment such as oxidation.
- the present invention provides the following thermally oxidized heterogeneous composite substrate and a method for manufacturing the same.
- It is a heterogeneous composite substrate having a single crystal silicon film on the handle substrate, and an intermediate heat treatment from 650 ° C. to 850 ° C. is performed before the thermal oxidation process exceeding 850 ° C., and then the temperature exceeds 850 ° C.
- Thermally oxidized heterogeneous composite substrate obtained by applying thermal oxidation treatment.
- a thermally oxidized heterogeneous composite substrate with a reduced number of defects after thermal oxidation can be obtained.
- the thermally oxidized heterogeneous composite substrate of the present invention is obtained by subjecting a heterogeneous composite substrate having a single crystal silicon film on a handle substrate to an intermediate heat treatment at 650 to 850 ° C., and then performing a thermal oxidation process at a temperature exceeding 850 ° C. can get.
- glass, quartz, sapphire and the like are the main subjects. These materials have a different expansion coefficient from silicon. The expansion coefficient is shown in Table 1 below.
- the SOQ that can be obtained by bonding silicon and quartz has a difference in expansion coefficient of 2.04 ppm.
- the minimum is 4.4 ppm and the maximum is 5.1 ppm.
- sapphire has a different expansion coefficient depending on the orientation, the effect of the present invention can be further improved by using a sapphire substrate having a small expansion coefficient in order to reduce the difference in expansion coefficient. Specifically, it is effective to avoid the use of an A-plane wafer having a large expansion coefficient and use the C-plane (7.0 ppm) or the R-plane (about 7.4 ppm).
- the thermal expansion coefficient of the handle substrate is preferably 0.54 to 7.4 ppm at 400 ° C. or less, and in the case of a sapphire wafer, the expansion coefficient is preferably 7.4 ppm or less from room temperature to 400 ° C. .
- the thickness of the handle substrate is preferably 500 to 800 ⁇ m, particularly 600 to 725 ⁇ m, and the thickness of the single crystal silicon film is preferably 50 to 500 nm, particularly 100 to 350 nm.
- the thickness is preferably 25 to 150 nm.
- the BOX oxide film may be formed by a method similar to that disclosed in Japanese Patent Laid-Open No. 2002-305292 for forming a buried oxide film on an SOI wafer.
- an intermediate heat treatment at 650 to 850 ° C., preferably 700 to 850 ° C. is performed.
- the atmosphere of the intermediate heat treatment is not particularly limited as long as it is easy to handle. Typical examples include argon, nitrogen, oxygen, hydrogen, helium and the like. Further, an inert gas such as argon or nitrogen and an oxidizing gas may be mixed.
- the time for the intermediate heat treatment is preferably 0.5 to 6 hours, particularly 1 to 3 hours. If it is too short, the object of the present invention may not be sufficiently achieved. If it is too long, the cost may increase.
- a thermal oxidation treatment is performed after the intermediate heat treatment.
- the heat treatment temperature is a temperature exceeding 850 ° C., preferably a temperature exceeding 900 ° C. to 1,000 ° C., particularly 950 to 1,000 ° C.
- the thickness is not particularly limited as long as a desired oxide film thickness is obtained.
- the intermediate heat treatment can be performed at 650 to 900 ° C., particularly 700 to 900 ° C.
- the heat treatment atmosphere is generally dry oxygen, water vapor or the like.
- the heat treatment time is not particularly limited as long as a desired oxide film thickness can be obtained.
- a thermally oxidized heterogeneous composite substrate having a significantly reduced number of defects can be obtained, but an HF immersion test can be applied to determine the number of defects in the composite substrate.
- the inspection can be easily performed. If it is too thin, HF will not penetrate, and if it is too thick, penetration of HF will be too fast, which may cause a disadvantage in inspection.
- Example 1 A plurality of SOS wafers using a sapphire wafer (R surface) having a diameter of 150 mm and a thickness of 600 ⁇ m as a supporting substrate were prepared.
- the thickness of silicon is 200 nm
- the thickness of the BOX layer is 200 nm.
- This wafer was subjected to intermediate heat treatment at 600 ° C., 650 ° C., 700 ° C., 800 ° C., 850 ° C., and 900 ° C.
- the atmosphere was argon gas and the holding time was 1 hour.
- One reference wafer without intermediate heat treatment was added, and a 200 nm oxide film was formed on these wafers by wet oxidation at 1,000 ° C.
- Example 2 A plurality of SOQ wafers using a quartz wafer having a diameter of 150 mm and a thickness of 625 ⁇ m as a supporting substrate were prepared.
- the thickness of silicon is 200 nm
- the thickness of the BOX layer is 200 nm.
- This wafer was subjected to intermediate heat treatment at 600 ° C., 650 ° C., 700 ° C., 800 ° C., 850 ° C., and 900 ° C.
- the atmosphere was argon gas and the holding time was 1 hour.
- One reference wafer without intermediate heat treatment was added, and a 200 nm oxide film was formed on these wafers by wet oxidation at 950 ° C.
- Example 3 A plurality of SOS wafers using a sapphire wafer having a diameter of 150 mm and a thickness of 600 ⁇ m as a supporting substrate were prepared.
- the thickness of silicon is 200 nm
- the thickness of the BOX layer is 200 nm.
- An intermediate heat treatment at 800 ° C. was applied to these wafers.
- the atmosphere was argon gas and the holding time was 1 hour.
- a 200 nm oxide film was formed on these wafers by wet oxidation at 1,000 ° C.
- This method has been described in an embodiment specific to quartz and sapphire, but is equally effective when a material having a thermal expansion coefficient (0.54 to 7.4 ppm) between quartz and sapphire is used as a handle substrate. is there.
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- Formation Of Insulating Films (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Thin Film Transistor (AREA)
Abstract
Description
また、この中間の熱処理は、貼り合わせ界面の貼り合わせ強度を、上記高温処理温度に到達する前に十分に高め、シリコン薄膜が強い応力を受けた際にも剥がれやズレを生じさせないための処理である。
そして、この中間熱処理を経た後に酸化などの高温処理を施すことで、酸化後の欠陥数を低減することが可能となるものである。
〔1〕
ハンドル基板上に単結晶シリコン膜を有する異種複合基板であり、850℃を超えた熱酸化処理を施す前に650℃から850℃までの中間熱処理を加え、然る後に850℃を超えた温度で熱酸化処理を施すことで得られる熱酸化異種複合基板。
〔2〕
ハンドル基板がガラス、石英、サファイアのいずれかであることを特徴とする〔1〕に記載の熱酸化異種複合基板。
〔3〕
ハンドル基板と単結晶シリコン膜との間に埋め込み酸化膜が介在することを特徴とする〔1〕又は〔2〕に記載の熱酸化異種複合基板。
〔4〕
中間熱処理の雰囲気が、アルゴン、窒素、酸素、水素、ヘリウム、又は不活性ガスと酸素を混合した雰囲気であることを特徴とする〔1〕~〔3〕のいずれかに記載の熱酸化異種複合基板。
〔5〕
ハンドル基板の熱膨張係数が400℃以下で0.54ppm以上7.4ppm以下であることを特徴とする〔1〕~〔4〕のいずれかに記載の熱酸化異種複合基板。
〔6〕
ハンドル基板がサファイアであり、サファイアウェーハの膨張係数が室温から400℃で7.4ppm以下であることを特徴とする〔5〕に記載の熱酸化異種複合基板。
〔7〕
ハンドル基板上に単結晶シリコン膜を有する異種複合基板に対し650~850℃の中間熱処理を加えた後、850℃を超えた温度で熱酸化処理を施すことを特徴とする熱酸化異種複合基板の製造方法。
〔8〕
ハンドル基板がガラス、石英、サファイアのいずれかであることを特徴とする〔7〕に記載の熱酸化異種複合基板の製造方法。
〔9〕
異種複合基板が、ハンドル基板と単結晶シリコン膜との間に埋め込み酸化膜が介在するものであることを特徴とする〔7〕又は〔8〕に記載の熱酸化異種複合基板の製造方法。
〔10〕
中間熱処理の雰囲気が、アルゴン、窒素、酸素、水素、ヘリウム、又は不活性ガスと酸素を混合した雰囲気であることを特徴とする〔7〕~〔9〕のいずれかに記載の熱酸化異種複合基板の製造方法。
〔11〕
ハンドル基板の熱膨張係数が400℃以下で0.54ppm以上7.4ppm以下であることを特徴とする〔7〕~〔10〕のいずれかに記載の熱酸化異種複合基板の製造方法。
〔12〕
ハンドル基板がサファイアであり、サファイアウェーハの膨張係数が室温から400℃で7.4ppm以下であることを特徴とする〔11〕に記載の熱酸化異種複合基板の製造方法。
この場合、ハンドル基板と単結晶シリコン膜との間に埋め込み酸化膜(BOX層:Box=Buried oxide)を介在させることもできる。
また、上記ハンドル基板の厚さは500~800μm、特に600~725μmが好ましく、単結晶シリコン膜の厚さは50~500nm、特に100~350nmが好ましい。埋め込み酸化膜(BOX酸化膜)を介在させる場合、その厚さは25~150nmが好ましい。なお、BOX酸化膜は、特開2002-305292号公報において、SOIウェーハの埋め込み酸化膜の成膜について開示されているのと同様の方法で形成すればよい。
この中間熱処理の雰囲気は、扱いやすいものであれば、特に限定を受けることはない。代表的なものとして、アルゴン、窒素、酸素、水素、ヘリウム等が挙げられる。また、アルゴンや窒素などの不活性ガスと酸化ガスを混合しても構わない。
また、中間熱処理の時間は、0.5~6時間、特に1~3時間であることが好ましい。短すぎると、本発明の目的が十分達成されないおそれがあり、長すぎると、コストの上昇を招くおそれがある。
熱処理時間は、所望の酸化膜厚が得られれば特に限定はない。
直径150mm、厚さ600μmのサファイアウェーハ(R面)を支持基板とするSOSウェーハを複数枚用意した。シリコンの厚さは200nm、BOX層の厚さは200nmである。このウェーハに、600℃、650℃、700℃、800℃、850℃、900℃の中間熱処理を加えた。雰囲気はアルゴンガスとし、保持時間を1時間とした。中間熱処理を施さないリファレンスのウェーハ1枚を追加し、これらのウェーハに1,000℃でウェット酸化により、200nmの酸化膜を形成した。酸化後、これらのウェーハを10%HF溶液に30分間浸漬し、欠陥の数を数えたところ、図1の結果を得た。650℃から850℃までの中間熱処理を加えたものは、欠陥数が減少している。600℃の中間熱処理を加えたものは欠陥がそれほど減少していないのは、600℃が効果を発現させるには不十分な温度なためと思われる。また900℃で中間処理したものは、中間処理の時点で既に欠陥が発現してしまったためと思われる。最適な温度は650℃から850℃程度と考えられる。
直径150mm、厚さ625μmの石英ウェーハを支持基板とするSOQウェーハを複数枚用意した。シリコンの厚さは200nm、BOX層の厚さは200nmである。このウェーハに、600℃、650℃、700℃、800℃、850℃、900℃の中間熱処理を加えた。雰囲気はアルゴンガスとし、保持時間を1時間とした。中間熱処理を施さないリファレンスのウェーハ1枚を追加し、これらのウェーハに950℃でウェット酸化により、200nmの酸化膜を形成した。酸化後、これらのウェーハを10%HF溶液に30分間浸漬し、欠陥の数を数えたところ、図2の結果を得た。650℃から850℃までの中間熱処理を加えたものは、欠陥数が減少している。600℃の中間熱処理を加えたものは欠陥がそれほど減少していないのは、600℃が効果を発現させるには不十分な温度なためと思われる。また900℃で中間処理したものは、中間処理の時点で既に欠陥が発現してしまったためと思われる。最適な温度は650℃から850℃程度と考えられる。
直径150mm、厚さ600μmのサファイアウェーハを支持基板とするSOSウェーハを複数枚用意した。この時のサファイアの方位は、C面(熱膨張係数CTE=7.0ppm)、R面(熱膨張係数CTE=7.4ppm)、A面(熱膨張係数CTE=7.7ppm)とした。シリコンの厚さは200nm、BOX層の厚さは200nmである。これらのウェーハに、800℃の中間熱処理を加えた。雰囲気はアルゴンガスとし、保持時間を1時間とした。これらのウェーハに1,000℃でウェット酸化により、200nmの酸化膜を形成した。酸化後、これらのウェーハを10%HF溶液に30分間浸漬し、欠陥の数を数えたところ、図3の結果を得た。C面、R面はA面よりも効果的に欠陥の数が減少していることが分かった。
Claims (12)
- ハンドル基板上に単結晶シリコン膜を有する異種複合基板であり、850℃を超えた熱酸化処理を施す前に650℃から850℃までの中間熱処理を加え、然る後に850℃を超えた温度で熱酸化処理を施すことで得られる熱酸化異種複合基板。
- ハンドル基板がガラス、石英、サファイアのいずれかであることを特徴とする請求項1に記載の熱酸化異種複合基板。
- ハンドル基板と単結晶シリコン膜との間に埋め込み酸化膜が介在することを特徴とする請求項1又は2に記載の熱酸化異種複合基板。
- 中間熱処理の雰囲気が、アルゴン、窒素、酸素、水素、ヘリウム、又は不活性ガスと酸素を混合した雰囲気であることを特徴とする請求項1~3のいずれか1項に記載の熱酸化異種複合基板。
- ハンドル基板の熱膨張係数が400℃以下で0.54ppm以上7.4ppm以下であることを特徴とする請求項1~4のいずれか1項に記載の熱酸化異種複合基板。
- ハンドル基板がサファイアであり、サファイアウェーハの膨張係数が室温から400℃で7.4ppm以下であることを特徴とする請求項5に記載の熱酸化異種複合基板。
- ハンドル基板上に単結晶シリコン膜を有する異種複合基板に対し650~850℃の中間熱処理を加えた後、850℃を超えた温度で熱酸化処理を施すことを特徴とする熱酸化異種複合基板の製造方法。
- ハンドル基板がガラス、石英、サファイアのいずれかであることを特徴とする請求項7に記載の熱酸化異種複合基板の製造方法。
- 異種複合基板が、ハンドル基板と単結晶シリコン膜との間に埋め込み酸化膜が介在するものであることを特徴とする請求項7又は8に記載の熱酸化異種複合基板の製造方法。
- 中間熱処理の雰囲気が、アルゴン、窒素、酸素、水素、ヘリウム、又は不活性ガスと酸素を混合した雰囲気であることを特徴とする請求項7~9のいずれか1項に記載の熱酸化異種複合基板の製造方法。
- ハンドル基板の熱膨張係数が400℃以下で0.54ppm以上7.4ppm以下であることを特徴とする請求項7~10のいずれか1項に記載の熱酸化異種複合基板の製造方法。
- ハンドル基板がサファイアであり、サファイアウェーハの膨張係数が室温から400℃で7.4ppm以下であることを特徴とする請求項11に記載の熱酸化異種複合基板の製造方法。
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| US14/366,125 US10103021B2 (en) | 2012-01-12 | 2013-01-11 | Thermally oxidized heterogeneous composite substrate and method for manufacturing same |
| KR1020147019998A KR102055933B1 (ko) | 2012-01-12 | 2013-01-11 | 열산화 이종 복합 기판 및 그 제조 방법 |
| EP13736379.2A EP2804202B1 (en) | 2012-01-12 | 2013-01-11 | Method for manufacturing a thermally oxidized heterogeneous composite substrate |
| SG11201404039UA SG11201404039UA (en) | 2012-01-12 | 2013-01-11 | Thermally oxidized heterogeneous composite substrate and method for manufacturing same |
| CN201380005209.0A CN104040686B (zh) | 2012-01-12 | 2013-01-11 | 热氧化异种复合基板及其制造方法 |
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| JP2012003856 | 2012-01-12 | ||
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| EP (1) | EP2804202B1 (ja) |
| JP (2) | JPWO2013105634A1 (ja) |
| KR (1) | KR102055933B1 (ja) |
| CN (1) | CN104040686B (ja) |
| SG (1) | SG11201404039UA (ja) |
| TW (1) | TWI576474B (ja) |
| WO (1) | WO2013105634A1 (ja) |
Cited By (3)
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| WO2014178356A1 (ja) * | 2013-05-01 | 2014-11-06 | 信越化学工業株式会社 | ハイブリッド基板の製造方法及びハイブリッド基板 |
| JP2015195290A (ja) * | 2014-03-31 | 2015-11-05 | 信越化学工業株式会社 | 酸化膜付き異種soi基板の欠陥検出方法 |
| JP2015195289A (ja) * | 2014-03-31 | 2015-11-05 | 信越化学工業株式会社 | 酸化膜付き異種soi基板の製造方法 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7262421B2 (ja) * | 2020-05-08 | 2023-04-21 | 信越化学工業株式会社 | 圧電体複合基板およびその製造方法 |
| JP7402112B2 (ja) | 2020-05-08 | 2023-12-20 | 信越化学工業株式会社 | 圧電性単結晶膜を備えた複合基板の製造方法 |
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- 2013-01-11 SG SG11201404039UA patent/SG11201404039UA/en unknown
- 2013-01-11 EP EP13736379.2A patent/EP2804202B1/en active Active
- 2013-01-11 JP JP2013553323A patent/JPWO2013105634A1/ja active Pending
- 2013-01-11 WO PCT/JP2013/050387 patent/WO2013105634A1/ja not_active Ceased
- 2013-01-11 TW TW102101103A patent/TWI576474B/zh active
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Also Published As
| Publication number | Publication date |
|---|---|
| JP6288323B2 (ja) | 2018-03-07 |
| CN104040686A (zh) | 2014-09-10 |
| KR20140112036A (ko) | 2014-09-22 |
| US10103021B2 (en) | 2018-10-16 |
| JP2017098577A (ja) | 2017-06-01 |
| TW201341604A (zh) | 2013-10-16 |
| JPWO2013105634A1 (ja) | 2015-05-11 |
| SG11201404039UA (en) | 2014-10-30 |
| US20140322546A1 (en) | 2014-10-30 |
| EP2804202A1 (en) | 2014-11-19 |
| CN104040686B (zh) | 2017-05-24 |
| KR102055933B1 (ko) | 2019-12-13 |
| EP2804202A4 (en) | 2015-09-16 |
| EP2804202B1 (en) | 2021-02-24 |
| TWI576474B (zh) | 2017-04-01 |
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