Polymeric gate insulators to induce synaptic photoresponse of organic transistors

Ko, Gyu-Min; Kang, Yu Gyeong; Jeong, Ui-Chan; Lee, Tae‐Woo; Park, Hea‐Lim

doi:10.1007/s40042-023-00811-z

Cited by 4 publications

(2 citation statements)

References 37 publications

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“…We note that SI with hydroxyl groups such as PVP is generally used to induce photomemory effect in OPTs. [37][38][39] However, our VOPT (wet-etching time of 20 s) showed a much higher on/off current ratio of B10 5 than the reference device (wet-etching time of 2.5 s) of B10 because of the sufficiently reduced leakage current. In practical computing systems, the on/off ratio of the memory component is a crucial parameter that governs the number of memory levels.…”

Section: Resultsmentioning

confidence: 61%

Engineered current path of vertical organic phototransistors for smart optoelectronic applications

An,

Jang,

Kim

et al. 2023

J. Mater. Chem. C

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Section: Resultsmentioning

confidence: 61%

Engineered current path of vertical organic phototransistors for smart optoelectronic applications

An,

Jang,

Kim

et al. 2023

J. Mater. Chem. C

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“…The charge trapping at organic semiconductor (OSC)/insulator interfaces can modulate the synaptic weight [44,45]. For example, when light stimulation is applied in a photonic synapse, electron-hole pairs are generated, and the characteristics of the insulating layer, such as hydroxyl groups in poly (4-vinylphenol), can lead to the trapping of photogenerated electrons at the OSC/insulator interfaces [46,47]. Even after the light spike is removed, trapped charges recombined and disappear, exhibiting STP and characteristics.…”

Section: Synaptic Properties Of Biological and Artificial Synaptic De...mentioning

confidence: 99%

Modulating short-term and long-term plasticity of polymer-based artificial synapses for neuromorphic computing and beyond

Jeong,

Ro,

Park

et al. 2024

Neuromorph. Comput. Eng.

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Neuromorphic devices that emulate biological neural systems have been actively studied to overcome the limitations of conventional von Neumann computing structure. Implementing various synaptic characteristics and decay time in the devices is important for various wearable neuromorphic applications. Polymer-based artificial synapses have been proposed as a solution to satisfy these requirements. Owing to the characteristics of polymer conjugated materials, such as easily tunable optical/electrical properties, mechanical flexibility, and biocompatibility, polymer-based synaptic devices are investigated to demonstrate their ultimate applications replicating biological nervous systems. In this review, we discuss various synaptic properties of artificial synaptic devices, including the operating mechanisms of synaptic devices. Furthermore, we review recent studies on polymer-based synaptic devices, focusing on strategies that modulate synaptic plasticity and synaptic decay time by changing the polymer structure and fabrication process. Finally, we show how the modulation of the synaptic properties can be applied to three major categories of these devices, including neuromorphic computing, artificial synaptic devices with sensing functions, and artificial nerves for neuroprostheses.

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Multi‐Color Synaptic Luminescence in RE‐Doped Ca₂SnO₄ (RE = Sm³⁺, Er³⁺, and La³⁺)

Wi,

Lee,

Han

et al. 2024

Adv Funct Materials

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Recently, there has been a surge of interest in neuromorphic computation inspired by the extraordinary characteristics of the human brain, such as low energy consumption, parallelism, adaptivity, cognitive abilities, and learning capabilities. Significant research efforts have focused on exploring optical synaptic behaviors in various functional materials. In this study, the potential of red, green and blue (RGB)‐colored long‐persistent luminescence (LPL) in Sm3+/Er3+/La3+‐doped Ca2SnO4 is investigated for synaptic functionality. The luminescence of the samples is continuously enhanced under serial photoexcitation pulse applications, that is, the potentiation process, which is a key feature demonstrated in biological synapses. In addition, multichannel synaptic functionalities in the full‐color range is successfully demonstrated by integrating individual RGB‐colored Sm3+/Er3+/La3+‐doped Ca2SnO4 into a single quantity. To validate the optical synaptic behavior of the samples in neuromorphic computing applications, a reservoir computing (RC) simulation is performed for space‐time data processing using the unique responses of the samples under 4‐bit excitation pulses. The results demonstrated that the multi‐channel synaptic behaviors in the samples should be more valid for utilization in the RC layer than the single channel of synaptic behavior. We suggest this exploration holds promise for the advancement of synaptic devices employing LPL materials.

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Polymeric gate insulators to induce synaptic photoresponse of organic transistors

Cited by 4 publications

References 37 publications

Engineered current path of vertical organic phototransistors for smart optoelectronic applications

Engineered current path of vertical organic phototransistors for smart optoelectronic applications

Modulating short-term and long-term plasticity of polymer-based artificial synapses for neuromorphic computing and beyond

Multi‐Color Synaptic Luminescence in RE‐Doped Ca₂SnO₄ (RE = Sm³⁺, Er³⁺, and La³⁺)

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Polymeric gate insulators to induce synaptic photoresponse of organic transistors

Cited by 4 publications

References 37 publications

Engineered current path of vertical organic phototransistors for smart optoelectronic applications

Engineered current path of vertical organic phototransistors for smart optoelectronic applications

Modulating short-term and long-term plasticity of polymer-based artificial synapses for neuromorphic computing and beyond

Multi‐Color Synaptic Luminescence in RE‐Doped Ca2SnO4 (RE = Sm3+, Er3+, and La3+)

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Product

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Multi‐Color Synaptic Luminescence in RE‐Doped Ca₂SnO₄ (RE = Sm³⁺, Er³⁺, and La³⁺)