Piezoelectric biaxial strain effects on the optical and photoluminescence spectra of 2D III–VI compound <b>
                     <i>α</i>
                  </b>-In2Se3 nanosheets

Guo, Feng; Jedrzejczyk, Michal Bartlomiej; Zhao, Yuqian; Io, Weng Fu; Bai, Gongxun; Wu, Wenzhuo; Hao, Jian

doi:10.1063/5.0001795

Cited by 18 publications

(9 citation statements)

References 37 publications

(38 reference statements)

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“…Unlike other 2D ferroelectric materials, which only involve pure in-plane (IP) or out-ofplane (OOP) orientations, semiconducting α-In 2 Se 3 exhibits reversible spontaneous electric polarization in both IP and OOP orientations under room temperature. [26][27][28][29] The strong interrelated coupling between the IP and OOP polarizations originates from the central Se atomic layer's lateral movement caused by an external electric field. Besides, the ferroelectric α-In 2 Se 3 has two different stacking modes named rhombohedral (3R) and hexagonal (2H), [30] which belong to the space group of R3m and P63/mmc, respectively, as shown in Figure 1c.…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Optoelectronic Synapse Based on Ferroelectric Van der Waals Heterostructure for Emulating the Entire Human Visual System

Guo

Song

Wong

et al. 2021

Adv Funct Materials

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The development of optoelectronic synapses can provide an important breakthrough toward creating a sophisticated and adaptable artificial visual system analogous to that of humans. However, it remains a great challenge to implement the various functions of the biological visual neuromorphic system at the single device level. Intriguingly, 2D van der Waals (vdW) heterostructure may offer a platform to address the issue. Here, a novel multifunctional synaptic device based on ferroelectric α-In 2 Se 3 /GaSe vdW heterojunction is proposed to emulate the entire biological visual system. Essential synaptic behaviors are observed in response to light and electrical stimuli; additionally, the retina-like selectivity for light wavelengths and the achievement of Pavlov's dog experiment demonstrate the device's capacity for processing complex electrical and optical inputs. Beyond the optoelectronic synaptic behaviors, the device incorporates memory and logic functions analogous to those in the brain's visual cortex. The results of artificial neural network simulations show that the vdW heterojunction-based device is completely capable of performing logic operations and recognizing images with a high degree of accuracy. The study indicates that versatile devices with a rationally designed construction have great potential for efficiently processing complex visual information and may simplify the design of artificial visual systems.

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Section: Resultsmentioning

confidence: 99%

Multifunctional Optoelectronic Synapse Based on Ferroelectric Van der Waals Heterostructure for Emulating the Entire Human Visual System

Guo

Song

Wong

et al. 2021

Adv Funct Materials

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“…7,59,60 In particular, controllable bi-axial homogeneous strains can be applied on 2D materials by tuning the temperature of substrate with large thermal expansion thermal expansion coefficients or modulating bias voltage on piezoelectric substrates. [61][62][63] Similar approaches might be applicable to study the effects of bi-axial strains on the magnetic properties of ScI 2 monolayers.…”

Section: Methodsmentioning

confidence: 99%

Biaxial strain induced multiple magnetic phase transitions in nonmagnetic transition metal halide monolayer

Zhou

Yang

et al. 2022

J. Mater. Chem. C

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“…Light-controlled performance has long been pursued because irradiation is a non-contact, non-damaging remote control mode and is different from the electric field, stress, magnetic field, and so forth . Very recently, temperature-dependent dielectric constant changes were found in SA under light irradiation .…”

Section: Introductionmentioning

confidence: 99%

Light-Driven Domain Switching on a Photochromic Ferroelectric

Liu

Wang

et al. 2023

Crystal Growth & Design

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Photochromic materials that undergo reversible structural transformations have been extensively investigated on their transition mechanism and electric and optic properties. However, switching the ferroelectric domain of such typical photochromic molecules has rarely been discussed. Here, we report a photochromic ferroelectric, namely, (E)-2,4-di-tert-butyl-(((2-fluorophenyl)imino)methyl)phenol (tBu-2-FSA), crystallizing in the R3c space group at room temperature. tBu-2-FSA undergoes a structural transformation via reversible enol–keto isomerization when being subject to light irradiation of various wavelengths. The reversible switching of the polarization of tBu-2-FSA under an external electric field verifies its ferroelectricity. More importantly, the erase and write of the ferroelectric domain on the surface layers of the tBu-2-FSA thin film can be governed by non-destructive irradiation of various light wavelengths. Thus, tBu-2-FSA is a photoswitching ferroelectric that does not rely on thermal dynamic phase transition, which is unrealizable by traditional ceramic ferroelectrics. This work will pave a way for the future of light-controlled smart materials and biomechanical materials science.

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Piezoelectric biaxial strain effects on the optical and photoluminescence spectra of 2D III–VI compound α -In2Se3 nanosheets

Cited by 18 publications

References 37 publications

Multifunctional Optoelectronic Synapse Based on Ferroelectric Van der Waals Heterostructure for Emulating the Entire Human Visual System

Multifunctional Optoelectronic Synapse Based on Ferroelectric Van der Waals Heterostructure for Emulating the Entire Human Visual System

Biaxial strain induced multiple magnetic phase transitions in nonmagnetic transition metal halide monolayer

Light-Driven Domain Switching on a Photochromic Ferroelectric

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