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    • 51. 发明授权
    • Substrate usable for an acoustic surface wave device, a method for fabricating the same substrate and an acoustic surface wave device having the same substrate
    • 用于声表面波装置的基板,用于制造相同基板的方法和具有相同基板的声表面波装置
    • US06815867B2
    • 2004-11-09
    • US09997997
    • 2001-11-30
    • Tomohiko ShibataYukinori NakamuraMitsuhiro Tanaka
    • Tomohiko ShibataYukinori NakamuraMitsuhiro Tanaka
    • H01L4108
    • H03H9/02543Y10T29/42
    • A base material made of C-faced sapphire single crystal is set on a susceptor installed in a reactor arranged horizontally. Then, a trimethyl-aluminum and an ammonia are introduced as raw material gases into the reactor and supplied onto the substrate, to form an AlN film. In this case, the temperature of the base material is set to 1100° C. or over, and the ratio (V raw material gas/III raw material gas) is set to 800 or below, and the forming pressure is set within a range of 7-17 Torr. As a result, the crystallinity of the AlN film is developed to 90 arcsec or below in FWHM of X-ray rocking curve, and the surface flatness of the AlN film is developed to 20 Å or below. Therefore, a substrate composed of the base material and the AlN film is preferably usable for an acoustic surface wave device, and if the substrate is employed, the deviation from the theoretical propagation velocity is set to 1.5 m/sec or below.
    • 将由C面蓝宝石单晶构成的基材设置在安装在水平排列的反应器中的基座上。 然后,将三甲基铝和氨作为原料气体引入反应器中并供给到基板上,形成AlN膜。 在这种情况下,将基材的温度设定为1100℃以上,将原料气体/ III原料气体的比率设定为800以下,将成形压力设定在 7-17 Torr。 结果,在X射线摇摆曲线的FWHM中,AlN膜的结晶度显现为90弧秒以下,AlN膜的表面平坦度显现为20以下。 因此,由基材和AlN膜构成的基板优选用于声表面波器件,如果使用基板,则与理论传播速度的偏差设定为1.5m / sec以下。