The dispersion and attenuation of the multi-physical fields coupled waves in a piezoelectric semiconductor

Jiao, Fengyu; Wei, Peijun; Zhou, Xiaoli; Zhou, Yun

doi:10.1016/j.ultras.2018.09.009

Cited by 82 publications

(18 citation statements)

References 28 publications

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“…in which the drift current of electrons is linearized, as in Refs. [11], [14], [21], and [22], with a small ∆n. Here, N D denotes the initial doping concentration, and µ n 33 and D n 33 are the carrier mobility and diffusion constants of the electrons, respectively.…”

Section: One-dimensional (1d) Equations For the Extension Of A Ps Fibermentioning

confidence: 99%

“…It is well known that the time-dependent behaviors of PS structures are more important to the devices than the above-mentioned static ones, for example, in applications such as frequency generation/operation, telecommunication, time keeping, and sensing [17] . However, most of the existing analyses of PS structures only considered the I-V characteristics in the steady-state [18][19][20][21] , wave propagation [22][23][24][25][26] , or time-harmonic vibration [27] . Although the above analyses can extract the most basic behaviors of PS structures including their resonant frequencies and mode shapes, important transient effects in device operations still cannot be described.…”

Section: Introductionmentioning

confidence: 99%

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Typical transient effects in a piezoelectric semiconductor nanofiber under a suddenly applied axial time-dependent force

Yang

Liang

2021

Appl. Math. Mech.-Engl. Ed.

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Based on the mechanical motion equation, Gauss’s law, and the current continuity condition, we study a few typical transient effects in a piezoelectric semiconductor (PS) fiber to realize the startup and turning-off functions of common piezotronic devices. In this study, the transient extensional vibration induced by a suddenly applied axial time-dependent force is examined in a cantilevered n-type ZnO nanofiber. Neither the magnitude of the loadings nor the doping concentration significantly affects the propagation caused by disturbance of the axial displacement. However, both of the factors play an important role in the propagation caused by disturbance of the electron concentrations. This indicates that the electromechanical coupling effect can be expected to directly determine the electronic performance of the devices. In addition, the assumption of previous simplified models which neglect the charge carriers in Gauss’s law is discussed, showing that this assumption has a little influence on the startup state when the doping concentration is smaller than 1021 m−3. This suggests that the screening effect of the carriers on the polarized electric field is much reduced in this situation, and that the state is gradually transforming into a pure piezoelectric state. Nevertheless, the carriers can provide a damping effect, which means that the previous simplified models do not sufficiently describe the turning-off state. The numerical results show that the present study has referential value with respect to the design of newly multifunctional PS devices.

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Section: One-dimensional (1d) Equations For the Extension Of A Ps Fibermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Typical transient effects in a piezoelectric semiconductor nanofiber under a suddenly applied axial time-dependent force

Yang

Liang

2021

Appl. Math. Mech.-Engl. Ed.

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“…The above equations are applicable to each component phase of the composite structure in Figure 1 as special cases. They have been used to study thickness vibration of plates [ 25 , 26 ], wave propagation [ 27 , 28 , 29 , 30 , 31 , 32 ], fields near cracks [ 33 , 34 , 35 ], extension of rods [ 36 , 37 , 38 , 39 ], bending of beams [ 40 , 41 , 42 , 43 , 44 , 45 ], and fields near PN junctions [ 46 , 47 , 48 , 49 ] in piezoelectric semiconductors.…”

Section: Governing Equationsmentioning

confidence: 99%

Magnetically Induced Carrier Distribution in a Composite Rod of Piezoelectric Semiconductors and Piezomagnetics

et al. 2020

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In this work, we study the behavior of a composite rod consisting of a piezoelectric semiconductor layer and two piezomagnetic layers under an applied axial magnetic field. Based on the phenomenological theories of piezoelectric semiconductors and piezomagnetics, a one-dimensional model is developed from which an analytical solution is obtained. The explicit expressions of the coupled fields and the numerical results show that an axially applied magnetic field produces extensional deformation through piezomagnetic coupling, the extension then produces polarization through piezoelectric coupling, and the polarization then causes the redistribution of mobile charges. Thus, the composite rod exhibits a coupling between the applied magnetic field and carrier distribution through combined piezomagnetic and piezoelectric effects. The results have potential applications in piezotronics when magnetic fields are relevant.

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“…Owing to the unique coupling of piezoelectricity and semiconductor properties, piezoelectric semiconductor (PS) materials are attracting tremendous attention in recent years [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Impact of PN junction inhomogeneity on the piezoelectric fields of acoustic waves in piezo-semiconductive fibers

Fang

Liu

et al. 2022

Ultrasonics

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The dispersion and attenuation of the multi-physical fields coupled waves in a piezoelectric semiconductor

Cited by 82 publications

References 28 publications

Typical transient effects in a piezoelectric semiconductor nanofiber under a suddenly applied axial time-dependent force

Typical transient effects in a piezoelectric semiconductor nanofiber under a suddenly applied axial time-dependent force

Magnetically Induced Carrier Distribution in a Composite Rod of Piezoelectric Semiconductors and Piezomagnetics

Impact of PN junction inhomogeneity on the piezoelectric fields of acoustic waves in piezo-semiconductive fibers

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