Electrohydrodynamically Printed Flexible Organic Memristor for Leaky Integrate and Fire Neuron

Xu, Yichun; Wang, Hongyang; Ye, Dong; Yang, Rui; Huang, Yong; Miao, Xiangshui

doi:10.1109/led.2021.3129202

Cited by 21 publications

(9 citation statements)

References 31 publications

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“…This flexible sensor successfully realized optical signal detection and color recognition, which can play an important role in artificial vision systems. By the inkjet printing equipment, a polymer memory resistor that is the core component of the neuronal circuit was also manufactured [75]. The high-resolution inkjet printing equipment provides strong technical support for the manufacturing of new flexible electronics.…”

Section: Inkjet Printing Equipmentmentioning

confidence: 99%

Flexible electronics manufacturing technology and equipment

Yin

Huang

Yang

et al. 2022

Sci. China Technol. Sci.

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Flexible electronics such as mechanically compliant displays, sensors and solar cells, have important applications in the fields of energy, national defence and biomedicine, etc. Various types of flexible electronics have been proposed or developed by the improvements in structural designs, material properties and device integrations. However, the manufacturing of flexible electronics receives little attention, which limits its mass production and industrialization. The increasing demands on the size, functionality, resolution ratio and reliability of flexible electronics bring several significant challenges in their manufacturing processes. This work aims to report the state-of-art technologies and applications of flexible electronics manufacturing. Three key technologies including electrohydrodynamic direct-writing, flip chip and automatic optical inspection are highlighted. The mechanism and developments of these technologies are discussed in detail. Based on these technologies, the present work develops three kinds of manufacturing equipment, i.e., inkjet printing manufacturing equipment, robotized additive manufacturing equipment, and roll-to-roll manufacturing equipment. The advanced manufacturing processes, equipment and systems for flexible electronics pave the way for applications of new displays, smart sensing skins and epidermal electronics, etc. By reviewing the developments of flexible electronics manufacturing technology and equipment, it can be found that the existing advances greatly promote the applications and commercialization of flexible electronics. Since flexible electronics manufacturing contains many multi-disciplinary problems, the current investigations are confronted with great challenges. Therefore, further developments of the reviewed manufacturing technology and equipment are necessary to break the current limitations of manufacturing resolution, efficiency and reliability. flexible electronics, micro/nano manufacturing, electrohydrodynamic direct-writing, flip chip, automatic optical inspection

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Section: Inkjet Printing Equipmentmentioning

confidence: 99%

Flexible electronics manufacturing technology and equipment

Yin

Huang

Yang

et al. 2022

Sci. China Technol. Sci.

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“…[45,46] Moreover, the conductivity of the ultrafine silver pattern is usually very poor, because the contact positions between Ag NPs is less in a thin space. [47,48] Zhang et al optimized the EHD printing parameters to increase the resolution to 10 μm, however, the resistance was as high as 100 Ω. [49] Li et al printed 5-50 μm Ag lines, while the conductivity dropped significantly with increasing resolution.…”

Section: Introductionmentioning

confidence: 99%

Electrohydrodynamic Printing of Ultrafine and Highly Conductive Ag Electrodes for Various Flexible Electronics

Feng

Zhang

et al. 2023

Adv Materials Technologies

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Silver nanoparticle (AgNP) based inks are widely used in printed electronics to form conductive patterns. However, high resolution and high electrical conductivity are still hard to achieve at the same time for the patterning of AgNP‐based electrodes. Herein, Ag patterns with a high resolution of sub‐10 µm and a high conductivity are realized by the electrohydrodynamic (EHD) printing. The parameters including the composition of Ag ink, printing speed, voltage, and working height are carefully controlled to increase the resolution, and the process window of the cone jet mode is established. With the help of the finite element simulation, the generation mechanism of the Taylor cone is clarified. Ag electrodes with various patterns and shapes are easily produced, which exhibited excellent patterning qualities, such as superior uniformity and flatness, narrow spacing, and clear edge definition. Finally, flexible light‐emitting diode (LED) circuits, transparent heaters, and supercapacitors are fabricated by EHD printed Ag grid electrodes. These results indicate that this work provides a simple and scalable strategy for fabricating ordered metal conductive patterns in the emerging printed electronics.

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“…[11,12,[14][15][16] Particularly, the organic memristors based on the filamentary conduction have been evaluated as promising candidates for synaptic components in neuromorphic systems, owing to the high current ratio between the high and low resistance states (HRS and LRS) and the stable retention performance for non-volatile memory characteristics. [11,12,15] In the filamentary based organic memristors, the metallic filaments are formed by the electric stimuli, resulting in the resistive switching features of the devices. Additionally, multilevel conductance states can be achieved in the devices by precisely controlling the filament thickness.…”

Section: Introductionmentioning

confidence: 99%

Formation of Cluster‐Structured Metallic Filaments in Organic Memristors for Wearable Neuromorphic Systems with Bio‐Mimetic Synaptic Weight Distributions

Jung,

Kim,

Jang

et al. 2023

Advanced Science

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With increasing demand for wearable electronics capable of computing huge data, flexible neuromorphic systems mimicking brain functions have been receiving much attention. Despite considerable efforts in developing practical neural networks utilizing several types of flexible artificial synapses, it is still challenging to develop wearable systems for complex computations due to the difficulties in emulating continuous memory states in a synaptic component. In this study, polymer conductivity is analyzed as a crucial factor in determining the growth dynamics of metallic filaments in organic memristors. Moreover, flexible memristors with bio‐mimetic synaptic functions such as linearly tunable weights are demonstrated by engineering the polymer conductivity. In the organic memristor, the cluster‐structured filaments are grown within the polymer medium in response to electric stimuli, resulting in gradual resistive switching and stable synaptic plasticity. Additionally, the device exhibits the continuous and numerous non‐volatile memory states due to its low leakage current. Furthermore, complex hardware neural networks including ternary logic operators and a noisy image recognitions system are successfully implemented utilizing the developed memristor arrays. This promising concept of creating flexible neural networks with bio‐mimetic weight distributions will contribute to the development of a new computing architecture for energy‐efficient wearable smart electronics.

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Electrohydrodynamically Printed Flexible Organic Memristor for Leaky Integrate and Fire Neuron

Cited by 21 publications

References 31 publications

Flexible electronics manufacturing technology and equipment

Flexible electronics manufacturing technology and equipment

Electrohydrodynamic Printing of Ultrafine and Highly Conductive Ag Electrodes for Various Flexible Electronics

Formation of Cluster‐Structured Metallic Filaments in Organic Memristors for Wearable Neuromorphic Systems with Bio‐Mimetic Synaptic Weight Distributions

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