Flexible Ferroelectric Devices: Status and Applications

Jia, Xi; Guo, Rui; Tay, Beng Kang; Yan, Xiaobing

doi:10.1002/adfm.202205933

Cited by 40 publications

(21 citation statements)

References 223 publications

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“…This kind of index (≈1) implies that fewer carriers recombination in the particularly complex electron‐hole pair transfer process (generation, separation, recombination, and trapping) in the self‐powered FPD. [ 33 ] To explore the optoelectronic performance of FPD in more detail. The I–t curves characteristic of TiO 2 /Cs 3 Cu 2 I 5 FPD and TiO 2 NTs FPD at −1 V bias were shown in Figure S5 (Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Woven Fibrous Photodetectors for Scalable UV Optical Communication Device

Deng

Cao

et al. 2023

Adv Funct Materials

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Fibrous photodetectors (FPDs) have attracted great interest in wearable and consumer electronics, which is a lightweight and flexible tools to achieve efficient light information transmission. However, there is a necessary compromise between high optoelectronic performance and high‐level integration. Herein, a woven optoelectronic keyboard consisting of 40 PD button units is extended and integrated from four individual FPDs, with the integration level expanding by 1000%. Each FPD is based on uniform type‐II TiO2/Cs3Cu2I5 heterojunction, which exhibits greatly reduced dark current by eight orders of magnitudes, large rectification ratio up to 33306@± 5V, high on–off ratio of 2.8 × 104@−1 V and self‐powered responsivity of 26.9 mA W−1. The vacuum‐deposited Cs3Cu2I5 nanoparticles finely passivate the massive defects and serve as a p‐type hole transport layer to improve hole transfer efficiency, which greatly promotes the radial transport and collection of photogenerated electrons. Moreover, the photocurrent remains highly stable after bending and twisting states. Intriguingly, the woven optoelectronic keyboards successfully realize logic AND/OR, further identifying the UV light signal as a keying text signal (“A–Z” letters, “0–9” numbers, and four punctuations). This work not only provides a scalable strategy to reduce device redundancy but also shows the great potential of fibrous photodetectors for wearable optical communication.

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Section: Resultsmentioning

confidence: 99%

Woven Fibrous Photodetectors for Scalable UV Optical Communication Device

Deng

Cao

et al. 2023

Adv Funct Materials

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“…Nevertheless, it gradually decreased until it stabilized at a value of 1.00 with the increase in the time interval between the two pulses (Figure 3d). Obviously, the PPF index is closely related to the time interval between the two consecutive pulses, and the A 2 /A 1 decay curve with Δt follows a double exponential function given by the following expression (1) where τ 1 and τ 2 represent the characteristic relaxation time of the rapid and slow phase, respectively. From the fitting results, that the values of 5.34 and 6.53 s were extracted τ 1 and τ 2 , respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The human brain is an interconnected network that is composed of organic biological microfibers (neurons), and the information travels throughout the body via neurons and synapses. For many years, the goal of the artificial intelligence discipline was the development of practical neural devices that can mimic the functions of the biological brain. − However, the already existing programmable computer system based on neural computing are less efficient in operating in complex environments compared to biological systems. , Thus, there is an urgent need to find alternative materials and structures to achieve efficient neuromorphic functions. Along these lines, the photonic neural system is regarded as a promising alternative .…”

Section: Introductionmentioning

confidence: 99%

Optically Readable Electrochromic-Based Microfiber Synaptic Device for Photonic Neuromorphic Systems

Shi

Bang-hu

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Optical synaptic devices possess great potential in both artificial intelligence and neuromorphic photonics. In this work, an optically readable electrochromic-based microfiber synaptic device was designed by the combination of a multimode fiber and an electrochromic device and using an external voltage to control the transmission of light in the fiber. The proposed synaptic device has the ability to imitate various basic functions of the biological synapses, such as synaptic plasticity, and paired-pulse facilitation (PPF), as well as the transition from short-term memory to long-term memory. Moreover, the proposed device decodes the output optical signal with the international Morse code to express the signal “HFUT” in two ways, and a 3 × 3 array composed of this device can simulate the perceptual learning process. The device can be easily prepared for a wide range of applications, and the incorporated microfibers can be replaced by planar optical waveguides, making it easy to be integrated into a more complex and versatile photonic neuromorphic system.

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“…[10] On the other hand, singlecrystalline BiFeO 3, a prototype multiferroic material, is realized in the freestanding membrane form to explore the effect of mechanical deformation on quantum properties. [9,14,15] Astonishingly, the freestanding BiFeO 3 membrane with two-unit, which is even thinner than the critical thickness for ferroelectricity, exhibits ferroelectricity. Also, freestanding BaTiO 3 (BTO) membrane preserving ferroelectricity was reported to realize ferroelectric tunneling junction devices.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Integration of Freestanding Bilayer Oxide Membrane for Multiferroicity

et al. 2023

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Transition metal oxides exhibit a plethora of electrical and magnetic properties described by their order parameters. In particular, ferroic orderings offer access to a rich spectrum of fundamental physics phenomena, in addition to a range of technological applications. The heterogeneous integration of ferroelectric and ferromagnetic materials is a fruitful way to design multiferroic oxides. The realization of freestanding heterogeneous membranes of multiferroic oxides is highly desirable. In this study, epitaxial BaTiO 3 /La 0.7 Sr 0.3 MnO 3 freestanding bilayer membranes are fabricated using pulsed laser epitaxy. The membrane displays ferroelectricity and ferromagnetism above room temperature accompanying the finite magnetoelectric coupling constant. This study reveals that a freestanding heterostructure can be used to manipulate the structural and emergent properties of the membrane. In the absence of the strain caused by the substrate, the change in orbital occupancy of the magnetic layer leads to the reorientation of the magnetic easy-axis, that is, perpendicular magnetic anisotropy. These results of designing multiferroic oxide membranes open new avenues to integrate such flexible membranes for electronic applications.

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Flexible Ferroelectric Devices: Status and Applications

Cited by 40 publications

References 223 publications

Woven Fibrous Photodetectors for Scalable UV Optical Communication Device

Woven Fibrous Photodetectors for Scalable UV Optical Communication Device

Optically Readable Electrochromic-Based Microfiber Synaptic Device for Photonic Neuromorphic Systems

Heterogeneous Integration of Freestanding Bilayer Oxide Membrane for Multiferroicity

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