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JOURNAL OF SYNTHETIC CRYSTALS ›› 2022, Vol. 51 ›› Issue (9-10): 1691-1702.

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Research Progress of AlN-Based Filters: Materials, Devices and Applications

OUYANG Peidong1, YI Xinyan1,2, LUO Tianyou1, WANG Wenliang1, LI Guoqiang1,2   

  1. 1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China;
    2. Guangzhou Aifo Light Communication Technology Co., Ltd., Guangzhou 510700, China
  • Received:2022-05-24 Online:2022-10-15 Published:2022-11-02

Abstract: In the era of 5G communication, bulk acoustic wave (BAW) filters have become an effective solution to achieve high-performance radio frequency (RF) filtering. In the current environment where film bulk acoustic resonator (FBAR) technology (the most mature BAW technology) and patents are held by a few companies, it is essential to make breakthroughs in piezoelectric film growth and device preparation, to form a unique BAW device technology route. This paper reviews the AlN thin film growth, the development of AlN in BAW filter devices, and the preparation and application of AlN-based BAW devices. With the efforts of domestic researchers, the single-crystalline AlN bulk acoustic resonator (SABAR) device has further improved the performance of BAW devices through independent innovation in the material growth method and preparation process. Moreover, it also brought a new route to eliminate the “neck sticking” problem to the RF filter industry constrained by foreign countries.

Key words: AlN thin film, bulk acoustic filter, material growth, device manufacturing, single-crystalline AlN bulk acoustic resonator

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