Sung‐Nam Lee

Tunable optoelectronic synaptic behavior in ultralow-temperature ALD-grown ZnO thin films

JunHyeong Park, J. H. Cho, SeungMin Song, Seyeon Tak et autres

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Charge-Trapping-Enhanced Resistive Switching and Charge Storage in Silk Fibroin–TiO2 Composite Memristors

송승민, JunHyeong Park, J. H. Cho, Seyeon Tak et autres

Silk fibroin (SF) is a promising bio-compatible material for transient and bio-integrated memory devices; however, its relatively high leakage current and limited resistance state stability remain critical issues. In this study, Ag/SF–TiO2/Pt bio-memristors were fabricated using SF–TiO2 composite films with TiO2 nanoparticle …

Wavelength-dependent synaptic plasticity and memory dynamics in graphene oxide optoelectronic synaptic devices

J. H. Cho, JunHyeong Park, 송승민, Seyeon Tak et autres

Forming-free resistive switching characteristics of RF-sputtered Ga2O3-based memristors

Hye Ryeong Lee, Hye Jin Lee, Dabin Jeon, Sung‐Nam Lee

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Synaptic plasticity and visual memory in WO3-Based optoelectronic devices controlled by electrode configuration

Dabin Jeon, Seung Hun Lee, Chang‐Shin Park, Han‐Ki Kim et autres

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Substrate Orientation-Dependent Synaptic Plasticity and Visual Memory in Sol–Gel-Derived ZnO Optoelectronic Devices

Dabin Jeon, J. H. Cho, Kyoung‐Bo Kim, Sung‐Nam Lee

We report Al/ZnO/Al optoelectronic synaptic devices fabricated on c-plane and m-plane sapphire substrates using a sol-gel process. The devices exhibit essential synaptic behaviors such as excitatory postsynaptic current modulation, paired-pulse facilitation, and long-term learning-forgetting dynamics described by Wickelgren's power law. Comparative analysis …

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Filamentary Gate‐Controlled CNT‐Based Optoelectronic Synaptic Devices for Light‐Driven Neuromorphic Memory

Sung‐Nam Lee, Dabin Jeon

Abstract Neuromorphic systems aim to replicate the brain's ability to process information with high efficiency and low energy consumption. Optoelectronic synaptic devices, which leverage light stimuli for signal processing and memory operations, have emerged as promising components for artificial visual perception. However, …

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Filamentary gate-controlled Ga2O3 synaptic device for in-sensing optoelectronic memory

Hye Jin Lee, Seung Hun Lee, Dabin Jeon, Sung‐Nam Lee

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Enhanced Optoelectronic Synaptic Performance in Sol–Gel Derived Al-Doped ZnO Thin Film Devices

Dabin Jeon, Seung Hun Lee, Sung‐Nam Lee

We report the fabrication and characterization of Al-doped ZnO (AZO) optoelectronic synaptic devices based on sol-gel-derived thin films with varying Al concentrations (0~4.0 wt%). Structural and optical analyses reveal that moderate Al doping modulates the crystal orientation, optical bandgap, and defect levels …

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Synaptic Plasticity and Memory Retention in ZnO–CNT Nanocomposite Optoelectronic Synaptic Devices

Seung Hun Lee, Dabin Jeon, Sung‐Nam Lee

This study presents the fabrication and characterization of ZnO-CNT composite-based optoelectronic synaptic devices via a sol-gel process. By incorporating various concentrations of CNTs (0-2.0 wt%) into ZnO thin films, we investigated their effects on synaptic behaviors under ultraviolet (UV) stimulation. The CNT …

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Enhanced Resistive Switching and Conduction Mechanisms in Silk Fibroin-Based Memristors with Ag Nanoparticles for Bio-Neuromorphic Applications

Jongyun Choi, Seung Hun Lee, Taehun Kim, Kyungtaek Min et autres

This study explores the resistive switching (RS) behavior and conduction mechanisms of Ag/SF-Ag NP/Si memristors with varying Ag NP concentrations. I-V measurements confirm stable RS characteristics across 100 cycles, with consistent set and reset voltages. Increasing Ag NP concentration enhances conductive filament …

Capacitance and Dielectric Properties of Spin-Coated Silk Fibroin Thin Films for Bioelectronic Capacitors

Jongyun Choi, Seung Hun Lee, Taehun Kim, Kyungtaek Min et autres

Silk fibroin, a biocompatible and flexible biopolymer derived from Bombyx mori silkworms, has shown promise in bioelectronics, due to its adjustable dielectric properties. This study investigates the influence of spin coating parameters on the optical, electrical, and dielectric properties of thin silk …