We fabricated film-bulk-acoustic resonator with high c-axis oriented AlN film on Mo/SiO2/Si(100) using metalorganic chemical vapor deposition. The resonant frequency and anti-resonant frequency of the fabricated resonator were 3.189GHz and 3.224GHz, respectively. The quality factor and the effective electromechanical coupling coefficient were 24.7 and 2.65%, respectively. The conditions of AlN deposition were substrate temperature of 950°C, pressure of 20Torr, and V-III ratio of 25000. We have successfully grown high c-axis oriented AlN film with 4×10-5Ωcm resistivity of Mo bottom electrode. The full width at half maximum (FWHM) of the AlN(0002) on Mo/SiO2/Si (100) and Mo/SiO2/Si (111) were 4° and 3.8°, respectively. The FWHM values of deposited AlN film are satisfied with the RF band pass filter specification for GHz-band wireless local area network.
ASJC Scopus subject areas
- Acoustics and Ultrasonics