scholarly journals Two-dimensional hybrid organic–inorganic perovskites as emergent ferroelectric materials

2020 ◽  
Vol 128 (6) ◽  
pp. 060906 ◽  
Author(s):  
Yuchen Hou ◽  
Congcong Wu ◽  
Dong Yang ◽  
Tao Ye ◽  
Vasant G. Honavar ◽  
...  
Keyword(s):  
Ferroelectric Materials ◽  
Two Dimensional

Giant tunnel electroresistance in ferroelectric tunnel junctions with metal contacts to two-dimensional ferroelectric materials

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
Lili Kang ◽  
Peng Jiang ◽  
Hua Hao ◽  
Yanhong Zhou ◽  
Xiaohong Zheng ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Ferroelectric Materials ◽  
Two Dimensional ◽  
Metal Contacts

A Two-Dimensional Free Energy Model for Single Crystalline Ferroelectrics

2005 ◽  
Vol 881 ◽  
Author(s):  
Sang-Joo Kim ◽  
Stefan Seelecke ◽  
Brian L. Ball ◽  
Ralph C. Smith ◽  
Chang-Hoan Lee
Keyword(s):  
Free Energy ◽  
Evolution Equations ◽  
Saddle Points ◽  
Ferroelectric Materials ◽  
Energy Model ◽  
Two Dimensions ◽  
Two Dimensional ◽  
Energy Potential ◽  
Single Crystalline ◽  
Free Energy Model

AbstractThe one-dimensional free energy model for ferroelectric materials developed in [1-3] is general-ized to two dimensions. The proposed two-dimensional energy potential consists of four energy wells corresponding to four variants of the material, four saddle points representing the barriers for 900 switching processes, and a local energy maximum across which 1800-switching processes take place. The free energy potential is combined with the evolution equations based on the theory of thermally activated processes. The prediction of the model is compared with the recent measurements on a Ba- TiO3 single crystalline ferroelectric in [4]. The responses of the model at various loading frequencies are calculated and the kinetics of 900 and 1800 switching processes are discussed.

2D Ferroelectric Devices: Working Principles and Research Progresses

2021 ◽  
Author(s):  
Minghao Liu ◽  
Ting Liao ◽  
Ziqi Sun ◽  
Yuantong Gu ◽  
Liangzhi Kou
Keyword(s):  
Response Time ◽  
Energy Cost ◽  
High Performance ◽  
Ferroelectric Materials ◽  
Low Energy ◽  
Two Dimensional ◽  
Short Response Time ◽  
Storage Density ◽  
Nanoelectronic Devices ◽  
High Storage

Two-dimensional (2D) ferroelectric materials are promising to be used for high-performance nanoelectronic devices, due to the non-volatility, high storage density, low energy cost and short response time originated from the...

Realizing giant tunneling electroresistance in two-dimensional graphene/BiP ferroelectric tunnel junction

Nanoscale ◽  
2019 ◽  
Vol 11 (36) ◽  
pp. 16837-16843 ◽  
Author(s):  
Lili Kang ◽  
Peng Jiang ◽  
Ning Cao ◽  
Hua Hao ◽  
Xiaohong Zheng ◽  
...  
Keyword(s):  
Tunnel Junction ◽  
Ferroelectric Materials ◽  
Two Dimensional ◽  
Doped Graphene ◽  
Ferroelectric Tunnel Junction

Giant tunneling electroresistance is realized through the construction of an all two-dimensional ferroelectric tunnel junction with 2D ferroelectric materials BiP and B/N-doped graphene.

scholarly journals Terahertz optics-driven phase transition in two-dimensional multiferroics

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Jian Zhou ◽  
Shunhong Zhang
Keyword(s):  
Phase Transition ◽  
Data Storage ◽  
Transition Process ◽  
Ferroelectric Materials ◽  
Two Dimensional ◽  
Phonon Modes ◽  
Switching Speed ◽  
Strongly Coupled ◽  
Mechanical Responses ◽  
Ferroic Materials

AbstractDisplacive martensitic phase transition is potentially promising in semiconductor-based data storage applications with fast switching speed. In addition to traditional phase transition materials, the recently discovered two-dimensional ferroic materials are receiving a lot of attention owing to their fast ferroic switching dynamics, which could tremendously boost data storage density and enhance read/write speed. In this study, we propose that a terahertz laser with an intermediate intensity and selected frequency can trigger ferroic order switching in two-dimensional multiferroics, which is a damage-free noncontacting approach. Through first-principles calculations, we theoretically and computationally investigate optically induced electronic, phononic, and mechanical responses of two experimentally fabricated multiferroic (with both ferroelastic and ferroelectric) materials, β-GeSe and α-SnTe monolayer. We show that the relative stability of different orientation variants can be effectively manipulated via the polarization direction of the terahertz laser, which is selectively and strongly coupled with the transverse optical phonon modes. The transition from one orientation variant to another can be barrierless, indicating ultrafast transition kinetics and the conventional nucleation-growth phase transition process can be avoidable.

scholarly journals Recent progress in the synthesis of novel two-dimensional van der Waals materials

2021 ◽  
Author(s):  
Renji Bian ◽  
Changcun Li ◽  
Qing Liu ◽  
Guiming Cao ◽  
Qundong Fu ◽  
...  
Keyword(s):  
Piezoelectric Materials ◽  
Van Der Waals ◽  
Ferroelectric Materials ◽  
Green Energy ◽  
Great Success ◽  
Two Dimensional ◽  
Preparation Conditions ◽  
Physical Fundamental ◽  
Fundamental Research ◽  
Quantum Technology

ABSTRACT The last decade has witnessed the significant progress of physical fundamental research and great success of practical application in two-dimensional (2D) van der Waals (vdW) materials since the discovery of graphene in 2004. Up to date, the vdW material is still a vibrant and fast expanding field, where tremendous reports have been published covering the topics from cutting-edge quantum technology to urgent green energy and so on. Here, we briefly reviewed the emerging hot physical topics and the intriguing materials, such as 2D topological materials, piezoelectric materials, ferroelectric materials, magnetic materials and twistronic heterostructures. Then various vdW material synthetic strategies were discussed in detail concerning the growth mechanisms, preparation conditions and the typical examples. Finally, prospects and further opportunities in the booming field of 2D materials were addressed.

scholarly journals Enhanced bulk photovoltaic effect in two-dimensional ferroelectric CuInP2S6

2021 ◽  
Author(s):  
Yue Li ◽  
Jun Fu ◽  
Xiaoyu Mao ◽  
Chen Chen ◽  
Heng Liu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Photovoltaic Effect ◽  
Free Path Length ◽  
Photocurrent Density ◽  
Ferroelectric Materials ◽  
Two Dimensional ◽  
Dramatic Decrease ◽  
Photocurrent Generation ◽  
Ferroelectric Perovskite ◽  
2D To 3D

Abstract The photocurrent generation in photovoltaics relies essentially on the interface of p-n junction or Schottey barrier with the photoelectric efficiency constrained by the Shockley-Queisser limit. The recent progresses have shown a promising route to surpass this limit via the bulk photovoltaic effect (BPVE) for crystals without inversion symmetry. Here we report the BPVE in two-dimensional (2D) ferroelectric CuInP2S6 with enhanced photocurrent density by two orders of magnitude higher than conventional bulk ferroelectric perovskite oxides. The BPVE is inherently associated to the room-temperature polar ordering in 2D CuInP2S6. We also demonstrate a crossover from 2D to 3D BPVE material with the observation of a dramatic decrease in photocurrent density when the thickness of the 2D material exceeds the free path length (\({l}_{0}\)) at around 40 nm. This work spotlights the potential application of ultrathin 2D ferroelectric materials for the third-generation photovoltaic cells.

A two-dimensional anionic CdIIpolymer constructed through dicyanamide coordination bridges

2015 ◽  
Vol 71 (8) ◽  
pp. 717-720 ◽  
Author(s):  
Hui-Ting Wang ◽  
Lin Zhou ◽  
Xiao-Li Wang
Keyword(s):  
Crystal Structure ◽  
Solid Phase ◽  
Inorganic Compounds ◽  
Three Dimensional ◽  
Ferroelectric Materials ◽  
Organic Cations ◽  
Supramolecular Network ◽  
Cadmium Nitrate ◽  
Two Dimensional ◽  
Nitrate Tetrahydrate

In the search for potential ferroelectric materials, molecular-based one-, two- and three-dimensional cadmium(II) organic–inorganic compounds have been of interest as they often display solid–solid phase transitions induced by a variation in temperature. A new cadmium dicyanamide complex, poly[4-dimethylamino-1-ethylpyridin-1-ium [tri-μ-dicyanamido-κ6N1:N5-cadmium(II)]], {(C9H15N2)[Cd(C2N3)3]}n, was synthesized by the reaction of 4-dimethylamino-1-ethylpyridin-1-ium bromide, cadmium nitrate tetrahydrate and sodium dicyanamide in aqueous solution. In the crystal structure, each CdIIcation is octahedrally coordinated by six terminal N atoms from six anionic dicyanamide (dca) ligands. Neighbouring CdIIcations are linked together by dicyanamide bridges to form a two-dimensional coordination polymer. The organic cations are not involved in the formation of the supramolecular network.

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