Abstract
The applications of surface acoustic wave (SAW) devices aim directly at piezoelectric thin films deposited onto amorphous diamond-like carbon (DLC) coated on silicon substrates from target ZnO in this study. Our high-velocity SAW filters are characterized using multi-layer structures of thin films by DLC depositing. However, if propagating velocity of diamond is much higher, then the SAW phase velocity of piezoelectric thin film ZnO deposited on DLC coated onto Si substrate is raised from 2800 to11430 m/s. Consequently, the GHz-band SAW devices could be fabricated using thin films of DLC without sub-micron photolithography technology. We have been also successfully fabricated and demonstrated the diamond-like SAW filters by evaporating interdigital transducers on ZnO thin films with ULSI technology.
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