Shear horizontal wave in a p-type Si substrate covered with a piezoelectric semiconductor n-type ZnO layer with consideration of PN heterojunction effects

Xu, Chunyu; Wei, Peijun; Wei, Zibo; Guo, Xiao

doi:10.1007/s00707-023-03771-4

Cited by 3 publications

(5 citation statements)

References 31 publications

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“…To reflect the difference between the homo-and hetero-junctions, the combinations of the upper PSC layer and lower PSC substrate are defined as upper n-type ZnO/lower p-type ZnO, upper p-type ZnO/lower n-type ZnO, upper n-type Si/lower p-type ZnO, and upper p-type Si/lower n-type ZnO, respectively. The constitutive parameters of these four PSC materials are contained in Table 1 [13,22]. The horizontal axes of the dispersion and attenuation curves are the frequency f in log coordinates.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…On the surface y = H, consider two types of boundary conditions: the mechanical open circuit and electrical open circuit, i.e., displacement-free and insulation surface boundary condition [22] N…”

Section: Problem Formulation and Basic Equationsmentioning

confidence: 99%

“…and the mechanical open circuit electrical short circuit, i.e., displacement-free and metalized ground surface boundary condition [22]…”

Section: Problem Formulation and Basic Equationsmentioning

confidence: 99%

“…It is indicated that the acoustoelectric fields in the space charge region of the non-uniform PSC PN junction are more sensitive to the applied mechanical forces compared with that of the uniform junction, especially for a heterogeneous PN junction. Treated as an electrical gradient layer between the covering layer and the substrate, Xu et al discussed the influence of PN junctions on the dispersion and attenuation characteristics of Love waves in PSC semi-infinite mediums [22]. It is found that the PN junction has an evident influence on the wave-mode shapes, electric potential, carrier concentration, electric displacement, and the current density of carriers of the above waves.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Homo- and Hetero-Junctions on the Propagation Characteristics of Love Waves in a Piezoelectric Semiconductor Semi-Infinite Medium

Guo,

Wang,

et al. 2024

Mathematics

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With the fast development and miniaturization of acoustic and electric smart devices, micro and nanoscale piezoelectric semiconductor materials are gradually being used to manufacture information communication, energy conversion, and nondestructive testing technologies. As the core components of the above piezoelectric semiconductor devices, homo- and hetero-junctions have an evident influence on the propagation performance of high-frequency and short-wavelength elastic waves inside the bulk piezoelectric semiconductor materials. Based on the Gurtin–Murdoch theory, a theoretical model of interface effect originating from homo- and hetero-junctions is established to investigate the propagation properties of Love waves in a piezoelectric semiconductor semi-infinite medium considering the electrical open circuit (insulation) and short circuit (metalized ground) surface boundary conditions and biasing electric fields. Four interface characteristic lengths are introduced to describe the electrical imperfect interface of homo- and hetero-junctions, which are legitimately confirmed through comparisons of the dispersion and attenuation curves of Love waves. The influence of homo- and hetero-junctions on the dispersion and attenuation characteristics of Love waves are elaborated in detail. Numerical results show that the interface characteristic lengths are independent of the electrical surface boundary conditions, acceptor and donor concentrations, thickness of the upper piezoelectric semiconductor layer, and biasing electric fields in the piezoelectric semiconductor semi-infinite medium. Moreover, the propagation characteristics of Love waves can be manipulated by changing the biasing electric field parallel to the homo- and hetero-junctions. Since the high-frequency and short-wavelength Love wave is an important class of surface acoustic waves propagating in micro- and nano-scale piezoelectric semiconductor materials, the establishment of mathematical models and the revelation of physical mechanisms are fundamental to the analysis and optimization of the above piezoelectric semiconductor devices.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: Problem Formulation and Basic Equationsmentioning

confidence: 99%

“…and the mechanical open circuit electrical short circuit, i.e., displacement-free and metalized ground surface boundary condition [22]…”

Section: Problem Formulation and Basic Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Homo- and Hetero-Junctions on the Propagation Characteristics of Love Waves in a Piezoelectric Semiconductor Semi-Infinite Medium

Guo,

Wang,

et al. 2024

Mathematics

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“…With a decrease in the physical dimensions of microor nano-scale PSC materials, the influence of the homo-and hetero-junctions on the propagation characteristics of SAW should be considered, i.e., the interface effect resulting from the homo-or hetero-junction. Compared with the investigation of Rayleigh SAW [25,26], Lamb SAW [27], shear-horizontal (SH) waves [28,29], and bulk waves [30,31] in the PSC, discussion regarding the interface effect resulting from the homo-and hetero-junctions on the propagation characteristics of radially propagated cylindrical SAW is relatively lacking, which motivated the design of the current study. Compared with the BAW and SAW investigated through the Cartesian coordinate system, radially propagated cylindrical SAW is motivated by a point wave source, of which the wave motion energy concentrates on a single point.…”

Section: Introductionmentioning

confidence: 99%

Influence of Homo- and Hetero-Junctions on the Propagation Characteristics of Radially Propagated Cylindrical Surface Acoustic Waves in a Piezoelectric Semiconductor Semi-Infinite Medium

Guo,

Wang,

et al. 2024

Mathematics

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This paper theoretically investigates the influence of homo- and hetero-junctions on the propagation characteristics of radially propagated cylindrical surface acoustic waves in a piezoelectric semiconductor semi-infinite medium. First, the basic equations of the piezoelectric semiconductor semi-infinite medium are mathematically derived. Then, based on these basic equations and the transfer matrix method, two equivalent mathematical models are established concerning the propagation of radially propagated cylindrical surface acoustic waves in this piezoelectric semiconductor semi-infinite medium. Based on the surface and interface effect theory, the homo- or hetero-junction is theoretically treated as a two-dimensional electrically imperfect interface in the first mathematical model. To legitimately confirm the interface characteristic lengths that appear in the electrically imperfect interface conditions, the homo- or hetero-junction is equivalently treated as a functional gradient thin layer in the second mathematical model. Finally, based on these two mathematical models, the dispersion and attenuation curves of radially propagated cylindrical surface acoustic waves are numerically calculated to discuss the influence of the homo- and hetero-junctions on the dispersion and attenuation characteristics of radially propagated cylindrical surface acoustic waves. The interface characteristic lengths are legitimately confirmed through the comparison of dispersion and attenuation curves calculated using the two equivalent mathematical models. As piezoelectric semiconductor energy harvesters usually work under elastic deformation, the establishment of mathematical models and the revelation of physical mechanisms are both fundamental to the analysis and optimization of micro-scale surface acoustic wave resonators, energy harvesters, and acoustic wave amplification based on the propagation of surface acoustic waves.

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Dispersion and bandgap feature of coupled Bloch waves in one-dimensional piezoelectric semiconductor phononic crystal with PN junction

Wei,

et al. 2024

Acta Mech

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Shear horizontal wave in a p-type Si substrate covered with a piezoelectric semiconductor n-type ZnO layer with consideration of PN heterojunction effects

Cited by 3 publications

References 31 publications

Influence of Homo- and Hetero-Junctions on the Propagation Characteristics of Love Waves in a Piezoelectric Semiconductor Semi-Infinite Medium

Influence of Homo- and Hetero-Junctions on the Propagation Characteristics of Love Waves in a Piezoelectric Semiconductor Semi-Infinite Medium

Influence of Homo- and Hetero-Junctions on the Propagation Characteristics of Radially Propagated Cylindrical Surface Acoustic Waves in a Piezoelectric Semiconductor Semi-Infinite Medium

Dispersion and bandgap feature of coupled Bloch waves in one-dimensional piezoelectric semiconductor phononic crystal with PN junction

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