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depolarization field in relaxor-based ferroelectric single crystals under one-cycle bipolar pulse drive

Chinese Physics B 2019年第12期28卷 326-330页

作者： Chuan-Wen Chen Yang Xiang Li-Guo Tang Lian Cui Bao-Qing Lin Wei-Dong Du Wen-Wu Cao Fujian Provincial Key Laboratory of Light Propagation and Transformation College of Information Science and EngineeringHuaqiao UniversityXiamen 361021China Department of Mathematics and Materials Research Institute The Pennsylvania State UniversityUniversity ParkPennsylvania 16802USA Department of Applied Marine Physics&Engineering Xiamen UniversityXiamen 361010China State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190China School of Electronic and Information Engineering Yangtze Normal UniversityChongqing 408003China Acoustic Science and Technology Laboratory Harbin Engineering UniversityHarbin 150001China

The [001]c-polarized(1-x)Pb(Mg1/3Nb2/3)O3–xPbTiO3(PMN-PT) single crystals are widely used in ultrasonic detection transducers and underwater acoustic sensors. However, the relatively small coercive field( 2 kV/cm) of such crystals restricts their application at high frequencies because the driving field will exceed the coercive field. The depolarization field can be considerably larger in an antiparallel direction than in a parallel direction with respect to polarization when the bipolar driving cycle starts. Thus, if the direction of the sine wave signal in the first half cycle is opposite to the polarization direction, then the depolarized domains can be repolarized in the second half of the sine cycle. However, if the direction of the sine wave signal in the first half of the cycle is along the polarization direction, then the change is negligible,and the domains switched in the second half of the sine cycle cannot be recovered. The design of electric driving method needs to allow the use of a large applied field to emit strong enough signals and produce good images. This phenomenon combined with the coercive field increases with the driving frequency, thereby making the PMN-PT single crystals usable for high-frequency applications. As such, the applied field can be considerably larger than the conventionally defined coercive field.

关键词： piezoelectric crystal coercive field depolarization field bipolar pulse

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Ultraviolet photodetectors based on ferroelectric depolarization field

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Journal of Energy Chemistry 2023年第2期77卷 487-498,I0013页

作者： Xiaoyu Zhou Qingqing Ke Silin Tang Jilong Luo Zihan Lu School of Microelectronics Science and Technology Sun Yat-sen UniversityZhuhai 519082GuangdongChina Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems Sun Yat-sen UniversityZhuhai 519082GuangdongChina

Ultraviolet(UV)photodetectors are extensively adopted in the fields of the Internet of Things,optical communications and ***,with broadening the application scope of UV photodetectors,developing integrated devices with more functionalities rather than basic photo-detecting ability are highly required and have been triggered ever-growing interest in scientific and industrial *** thin films have become a potential candidate in the field of UV detection due to their wide bandgap and unique photovoltaic ***,ferroelectric thin films perform excellent dielectric,piezoelectric,pyroelectric,acousto-optic effects,etc.,which can satisfy the demand for the diversified development of UV *** this review,according to the different roles of ferroelectric thin films in the device,the UV photodetectors based on ferroelectric films are classified into ferroelectric depolarization field driven type,ferroelectric depolarization field and built-in electric field co-driven type,and ferroelectric field enhanced *** three types of ferroelectric UV photodetectors have great potential and are expected to promote the development of a new generation of UV detection *** the end of the paper,the advantages and challenges of three types of ferroelectric UV photodetectors are summarized,and the possible development direction in the future is proposed.

关键词： UV photodetector Ferroelectric Thin film depolarization field Built-in electric field

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Study of depolarization field Influence on Ferroelectric Films Within Transverse Ising Model

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Communications in Theoretical Physics 2005年第3期43卷 556-560页

作者： TAOYong-Mei SHIQin-Fen JIANGQing DepartmentofPhysics ChangshuCollegeChangshu215500China／／DepartmentofPhysicsSuzhouUniversity，Suzhou215006China DepartmentofPhysics SuzhouUniversity，Suzhou215006China

An improved transverse Ising model is proposed by taking the depolarization field effect into account. Within the framework of mean-held theory we investigate the behavior of the ferroelectric thin film. Our results show that the influence of the depolarization field is to flatten the spontaneous polarization profile and make the films more homogeneous, which is consistent with Ginzburg Landau theory. This fact shows that this model can be taken as an effective model to deal with the ferroelectric film and can be further extended to refer to quantum effect. The competition between quantum effect and depolarization field induces some interesting phenomena on ferroelectric thin films.

关键词： ferroelectric films depolarization field transverse Ising model

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Design space for stabilized negative capacitance in HfO2 ferroelectric-dielectric stacks based on phase field simulation

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Science China(Information Sciences) 2021年第2期64卷 192-201页

作者： Pengying CHANG Gang DU Xiaoyan LIU Institute of Microelectronics Peking University

Polarization evolution with space and time in HfO2based metal-ferroelectric-insulator-metal（MFIM） structure is studied based on the phase field model by self-consistently solving the two-dimensional time-dependent Ginzburg-Landau and Poisson equations. Through examining the domain wall and electrostatic（depolarization） energies compared with the negative ferroelectric（FE） anisotropy energy, the correlation between the domain pattern（phase transition） and negative capacitance（NC） effect is revealed for different structure parameters and material properties, including FE thickness and gradient coefficient,dielectric permittivity and thickness, and operation frequency of applied voltage. The design space for stabilized NC with（near） hysteresis-free operation accompanied with voltage amplification is limited by phase transition, implying the potentials and limitations of FE HfO2for energy-efficient steep-slope devices.

关键词： ferroelectric polarization dynamics hysteresis negative capacitance depolarization field

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