Optimization of AlN thin layers on diamond substrates for high frequency SAW resonators

AlN/diamond heterostructures are very promising for high frequency surface acoustic wave (SAW) resonators. In their design, the thickness of the piezoelectric film is one of the key parameters. On the other hand, the film material quality and, hence, the device performance, also depend on that thick...

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Veröffentlicht in:Materials letters 2012, Vol.66 (1), p.339-342
Hauptverfasser: Rodríguez-Madrid, J.G., Iriarte, G.F., Araujo, D., Villar, M.P., Williams, O.A., Müller-Sebert, W., Calle, F.
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container_end_page 342
container_issue 1
container_start_page 339
container_title Materials letters
container_volume 66
creator Rodríguez-Madrid, J.G.
Iriarte, G.F.
Araujo, D.
Villar, M.P.
Williams, O.A.
Müller-Sebert, W.
Calle, F.
description AlN/diamond heterostructures are very promising for high frequency surface acoustic wave (SAW) resonators. In their design, the thickness of the piezoelectric film is one of the key parameters. On the other hand, the film material quality and, hence, the device performance, also depend on that thickness. In this work, polished microcrystalline diamond substrates have been used to deposit AlN films by reactive sputtering, from 150 nm up to 3 μm thick. A high degree of the c-axis orientation has been obtained in all cases. SAW one port resonators at high frequency have been fabricated on these films with a proper combination of the film thickness and transducer size. ► We deposit AlN on Diamond substrates by sputtering for high-frequency applications. ► The thickness of the AlN film influences on the crystal quality. ► The deposit of AlN on diamond has been optimized for different film thicknesses. ► The crystal quality for AlN films on diamond improves as its thickness increases. ► The layers were used to process SAW resonators operating above 10 GHz.
doi_str_mv 10.1016/j.matlet.2011.09.003
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subjects acoustics
AlN sputtering
Aluminum nitride
Diamond
Film thickness
films (materials)
High frequencies
High frequency
nanodiamonds
Piezoelectric films
Polished
Resonators
SAW resonators
Surface acoustic waves
Thin films
title Optimization of AlN thin layers on diamond substrates for high frequency SAW resonators
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