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Role of Am Piezoelectric Crystal Orientation in Solidly Mounted Film Bulk Acoustic Wave Resonators

  • 발행 : 2003.04.01

초록

To investigate the effect of AIN c-axis orientation on the resonance performance of film bulk acoustic wave resonators, solidly mounted resonators with crybtallographically different AIN piezoelectric films were prepared by changing only the bottom electrode surface conditions. As increasing the degree of c-axis texturing, the effective electromechanical coupling coefficient ($\kappa$$\_$eff/)$^2$ in resonators increased gradually. The least 4 degree of full width at half maximum in an AIN(002) rocking curve, which corresponds to $\kappa$$^2$$\_$eff/ of above 5%, was measured to be necessary for band pass filter applications in wireless communication system. The longitudinal acoustic wave velocity of AIN films varied with the degree of c-axis texturing. The velocity of highly c-axis textured AIN film was extracted to be about 10200 n/s by mathematical analysis using Matlab.

키워드

참고문헌

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피인용 문헌

  1. Crystallographic Texture of Submicron Thin Aluminum Nitride Films on Molybdenum Electrode for Suspended Micro and Nanosystems vol.2, pp.4, 2013, https://doi.org/10.1149/2.001305jss
  2. Group III nitride and SiC based MEMS and NEMS: materials properties, technology and applications vol.40, pp.20, 2007, https://doi.org/10.1088/0022-3727/40/20/S19