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- W2044691409 abstract "We present a study of the effective piezoelectric activity of thin ZnO films produced by radio-frequency (rf) planar magnetron sputtering. The energetic plasma particles which bombard the substrate in the above deposition system increase the substrate temperature, thus causing a gradual variation in film structure during the beginning of the film growth. As a result, a precursor layer is formed which consists of small randomly oriented crystallites, exhibiting poor piezoelectric activity. Hence, the film thickness responsible for piezoelectric activity is generally less than the physical thickness of the film and is adjacent to a layer having different acoustic impedance. This leads to an increase in the resonant frequency of the film. For example, a film designed to have a half-wave resonance at 288 MHz, was found to be resonant at 332 MHz. The poorly structured initial layer meant in this typical case that only 87% of this film volume exhibited piezoelectric activity. Investigations based on the substrate temperature, the optical losses, scanning electron microscope imaging, and rf electrical behavior are presented in this letter." @default.
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- W2044691409 date "1995-09-18" @default.
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- W2044691409 title "Effective piezoelectric activity of zinc oxide films grown by radio-frequency planar magnetron sputtering" @default.
- W2044691409 doi "https://doi.org/10.1063/1.115053" @default.
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