Sc and Er Co-Doped AlN Surface Acoustic Wave Devices

Shiping Mao, Zixiong Ru, Changtao Yang*, Jian Zhou*, Jianhui Wu, Yongqing Fu

*Corresponding author for this work

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Abstract

Co-doping AlN film with various elements of rare earth or transition metals has been considered as a good method to significantly improve its piezoelectric responses of surface acoustic wave (SAW) devices. In this paper, we investigated the influences of different Er/ Sc atomic percentage ratio on the piezoelectric and acoustic wave properties of the Er and Sc co-doped AlN films prepared by RF magnetron sputtering. Results show that c/a-axis ratio of the AlN films decreases after doped with Sc, whereas those of the AlN films codoped with Er and Sc increase as the Er/Sc ratio increases. The reasons can be explained from the competitions of Sc and Er elements for occupying the Al atoms sites, and the larger ion radius of the Er compared that of Sc, which causes significant increase of c/a. Resonant frequency and Rayleigh wave velocity of the SAW resonators fabricated using these co-doped AlN films decrease as the Er/Sc ratio increases. Electromechanical coupling coefficient (k2 eff) of the SAW devices increases after the AlN film is single doped with either Sc or Er element, but decreases after co-doping with both Er and Sc.
Original languageEnglish
Pages (from-to)171-178
Number of pages8
JournalIntegrated Ferroelectrics
Volume230
Issue number1
Early online date6 Oct 2022
DOIs
Publication statusPublished - 22 Nov 2022

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