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    • 3. 发明公开
    • COMPOSITE SUBSTRATE
    • 复合材料基材
    • EP2787638A1
    • 2014-10-08
    • EP13840126.0
    • 2013-11-11
    • NGK Insulators, Ltd.NGK Ceramic Device Co., Ltd.
    • TAI, TomoyoshiIWASAKI, YasunoriHORI, YujiYAMADERA, TakahiroHATTORI, RyosukeSUZUKI, Kengo
    • H03H9/25H03H9/145
    • H01L41/0838H01L41/053H01L41/312H03H9/02574
    • A composite substrate according to the present invention includes a piezoelectric substrate that is a single-crystal lithium tantalate or lithium niobate substrate, a support substrate that is a single-crystal silicon substrate, and an amorphous layer joining together the piezoelectric substrate and the support substrate. The amorphous layer contains 3 to 14 atomic percent of argon. The amorphous layer includes, in order from the piezoelectric substrate toward the composite substrate, a first layer, a second layer, and a third layer. The first layer contains a larger amount of a constituent element (such as tantalum) of the piezoelectric substrate than the second and third layers. The third layer contains a larger amount of a constituent element (silicon) of the support substrate than the first and second layers. The second layer contains a larger amount of argon than the first and third layers.
    • 根据本发明的复合基板包括:作为单晶钽酸锂或铌酸锂基板的压电基板,作为单晶硅基板的支撑基板和将压电基板和支撑基板接合在一起的非晶层 。 无定形层含有3至14原子百分比的氩。 非晶层从压电基板朝向复合基板依次包括第一层,第二层和第三层。 第一层含有比第二层和第三层更大量的压电基片的组成元素(如钽)。 与第一层和第二层相比,第三层含有更多的支撑基板的构成元素(硅)。 第二层含有比第一层和第三层更大量的氩。
    • 4. 发明公开
    • COMPOSITE SUBSTRATE, ELASTIC SURFACE WAVE DEVICE, AND METHOD FOR PRODUCING COMPOSITE SUBSTRATE
    • 复合基材,为了制造基片可弯曲声表面波器件和方法
    • EP2736169A1
    • 2014-05-28
    • EP13821781.5
    • 2013-07-12
    • NGK Insulators, Ltd.
    • HORI, YujiHATTORI, RyosukeTAI, Tomoyoshi
    • H03H9/145C04B37/02H03H3/08H03H9/25
    • H03H9/64C04B37/02H01L41/312H03H3/02H03H3/08H03H9/02574H03H9/02622H03H9/02866H03H9/0538H03H9/059H03H9/0595H03H9/145H03H9/25
    • In a composite substrate 10, a bonding surface 21 of a piezoelectric substrate 20 is an irregular surface which is partially planarized. The irregular surface which is partially planarized includes a plurality of protrusions 23, each having a flat portion 25 on the tip thereof. The piezoelectric substrate 20 and the supporting substrate 30 are directly bonded to each other at the flat portions 25. By forming the bonding surface 21 into an irregular surface (rough surface) and providing flat portions 25 at the same time, it is possible to secure a sufficient contact area between the piezoelectric substrate 20 and the supporting substrate 30. Accordingly, in the composite substrate in which the piezoelectric substrate 20 and the supporting substrate 30 are bonded to each other, the bonding surface 21 can be roughened and direct bonding can be performed. Furthermore, it is possible to obtain a surface acoustic wave device in which heat resistance is enhanced by performing direct bonding without using an adhesive, and also bulk waves are scattered because of the roughened bonding surface, thus improving characteristics.
    • 在复合基板10,压电基片20的贴合面21是不规则的表面的所有被部分平坦化。 不规则表面的所有其被平坦化部分包括:突起23,其各自具有在前端的平坦部25种的多元性。 压电基板20和支撑基板30在平坦部分25直接键合到彼此通过形成粘贴面21成不规则表面(粗糙表面),并在同一时间提供平坦部25,所以能够确保 压电基板20和支撑基板之间的足够的接触面积30。因此,在将压电基板20和支撑基板30彼此接合的复合衬底,接合表面21可以被粗糙化,直接结合可以是 执行。 进一步,有可能获得其中耐热性的表面声波器件是通过不使用粘接剂上执行直接粘结增强,因此体波被散射由于粗糙接合面,从而提高特性。