Temperature Coefficient of SAW Device on SiO<sub>2</sub>/Proton Exchanged LiNbO<sub>3</sub>Substrate

Cheng, Chien‐Chuan; Kao, K. C.; Chen, Ying–Chung; Chung, Chung-Jen

doi:10.1080/00150190490457735

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…6 at 280–320 K as functions of the number of layers. In the figure, the TCF of the LiNbO 3 crystal without a graphene layer is , which is close to the reported value of 43 . It is clear that the TCFs of zero-, mono-, bi-, and tetra-graphene layer samples are almost the same, but the TCFs of the tri- and penta-layer samples are higher and lower, respectively.…”

Section: Resultssupporting

confidence: 87%

“…The thermal coefficient of the fundamental frequency (TCF) of LiNbO 3 crystal is well known as one important parameter of the SAW device. Its value is reported to be near room temperature 43 . The TCF is sensitive to presence of graphene layers because mass accumulation changes the Young’s modulus and mass density of the graphene/LiNbO 3 interface 44 .…”

Section: Resultsmentioning

confidence: 96%

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Possible pair-graphene structures govern the thermodynamic properties of arbitrarily stacked few-layer graphene

Sun

Kirimoto

Takase

et al. 2021

Sci Rep

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The thermodynamic properties of few-layer graphene arbitrarily stacked on LiNbO3 crystal were characterized by measuring the parameters of a surface acoustic wave as it passed through the graphene/LiNbO3 interface. The parameters considered included the propagation velocity, frequency, and attenuation. Mono-, bi-, tri-, tetra-, and penta-layer graphene samples were prepared by transferring individual graphene layers onto LiNbO3 crystal surfaces at room temperature. Intra-layer lattice deformation was observed in all five samples. Further inter-layer lattice deformation was confirmed in samples with odd numbers of layers. The inter-layer lattice deformation caused stick–slip friction at the graphene/LiNbO3 interface near the temperature at which the layers were stacked. The thermal expansion coefficient of the deformed few-layer graphene transitioned from positive to negative as the number of layers increased. To explain the experimental results, we proposed a few-layer graphene even–odd layer number stacking order effect. A stable pair-graphene structure formed preferentially in the few-layer graphene. In even-layer graphene, the pair-graphene structure formed directly on the LiNbO3 substrate. Contrasting phenomena were noted with odd-layer graphene. Single-layer graphene was bound to the substrate after the stable pair-graphene structure was formed. The pair-graphene structure affected the stacking order and inter-layer lattice deformation of few-layer graphene substantially.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 96%

Possible pair-graphene structures govern the thermodynamic properties of arbitrarily stacked few-layer graphene

Sun

Kirimoto

Takase

et al. 2021

Sci Rep

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“…1,2) As the substrates, LiNbO 3 and LiTaO 3 have been widely used for surface acoustic wave (SAW) filters because of their excellent piezoelectric properties. 3,4) With the development of frequency agile communications, tunable acoustic filters have received great attention. Compared to semiconductor capacitors, BST capacitors have a higher power capacity, smaller size, and shorter response time.…”

mentioning

confidence: 99%

Wide-range tunable Ba_0.7Sr_0.3TiO₃ films capacitors on LiNbO₃ substrates

Mao¹,

Lu²,

Luo³

et al. 2022

Appl. Phys. Express

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Ba0.7Sr0.3TiO3 (BST) films on Y-cut LiNbO3 substrates are investigated to realize wide-range tunable BST capacitors. The performances of the BST films are improved by the optimal magnetron sputtering conditions. It is found that the permittivity tunability of the BST capacitor reaches 300% under an applied voltage of 5V. Moreover, the film has a high dielectric constant 2700 under an applied voltage of 0 V, and the Q value of the BST capacitor exceeds 3000. The results demonstrate that the BST film on the LiNbO3 substrate has potential as a wide-range tunable capacitor for tunable surface acoustic wave filters.

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