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A Study on the ZnO Piezoelectric Thin Film SAW Filter for High Frequency

ZnO 압전 박막을 이용한 고주파 SAW 필터 연구

  • 박용욱 (남서울대학교 전자정보통신공학부) ;
  • 신현용 (남서울대학교 전자정보통신공학부)
  • Published : 2003.06.01

Abstract

ZnO thin films on glass substrate were deposited by RF magnetron reactive sputtering at 100 W, 1.33 Pa, Ar/O2=50 : 50, 200$^{\circ}C$, and a target/substrate distance of 4 cm. Crystallinities, surface morphologies, chemical compositions, and electrical properties of the films were investigated by XRD, SEM, AFM, RBS, and electrometer. All films showed a strong preferred c-axis orientation and the chemical stoichiometry. The propagation velocity of ZnO/IDT/glass of single electrode and double electrode types SAW filter was about 2,589 m/sec, 2,533 m/sec and insertion loss was a minimum value of about -11 dB and -21 dB, respectively.

RF 마그네트론 스퍼터링법을 이용하여 유리기판위에 인가전력 100 W, 1.33Pa, Ar/O2=50 : 50, 20$0^{\circ}C$ 그리고 타겟과 기판사이의 거리 4 cm의 조건으로 ZnO 압전 박막을 성장시켰다. 증착된 박막의 결정성, 표면형상, 화학적 결합비와 전기적 특성을 XRD, SEM, AFM, RBS와 electrometer를 이용하여 측정 분석하였다 제조된 박막은 우수한 c축 우선 배향성을 보였고 또한 화학 양론적인 결합비를 나타내었다. 전극 구조가 single 및 double IDT를 갖는 ZnO/1DT/glass SAW 필터를 제작하여 특성을 분석한 결과, 전파속도는 각각 2,589 m/sec, 2,533 m/sec이었고, 삽입손실은 -11 dB과 -21 dB 값을 나타내어 박막형 SAW 필터로 응용이 기대된다.

Keywords

References

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Cited by

  1. Deposition of Piezoelectric ZnO Films by RF Magnetron Sputtering and its Application to SAW Devices vol.1035, pp.1946-4274, 2007, https://doi.org/10.1557/PROC-1035-L05-16
  2. SAW Filter Made of ZnO/Nanocrystalline Diamond Thin Films vol.42, pp.5, 2009, https://doi.org/10.5695/JKISE.2009.42.5.216