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Color-selective Schottky Barrier Modulation for Optoelectric Logic
최영진,김성찬,우휘제,송영재,황의헌,강문성,조정호 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
The limitation on signal processes implementable using conventional circuits based on necessitates revolutionary change in device structures such that they can exploit photons or light. Herein, we introduce optoelectric logic circuits converting optical signals with different wavelengths colors into electric signals. Such circuits are assembled using unit devices in which electric current through channel is gated by lights of different colors. Color-selective optical modulation of the device is achieved using graphene decorated with different organic dyes as the electrode of Schottky diode. The drastic change in electrode work function under illumination induces a change in the height of Schottky barrier formed at the electrode/semiconductor junction and consequent modulation of current; we term the developed device a photonic barristor. We construct logic circuits using array of photonic barristors executing the functions of conventional NAND and NOR gates from optical input signals.
노동규,김성찬,최윤영,우휘제,강문성,송영재,안종현,이윤명,조정호 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
The nature of repetitive learning and oblivion of memory enables humans to manage vast amounts of memory by prioritizing information for long-term storage. This paper presents an artificial synaptic array, which mimics the biological memorization process by replicating Ebbinghaus’ forgetting curve. To construct the artificial synaptic array, access transistors and synaptic memory transistors were designed using indium-gallium-zinc-oxide and poly(3-hexylthiophene), respectively. To secure the desired performance of the access transistor in regulating the input signal to the synaptic transistor, the content of gallium in the access transistor was optimized. We realized repetitive learning characterizing Ebbinghaus’ oblivion curves using an artificial synaptic array with optimized conditions for both transistor components. Furthermore, we were able to mimic selective attention for information prioritization in the human brain.
Artificial Stimuli-Response System Capable of Conscious Response
김성찬,노동규,최윤영,우휘제,박중필,이종익,최용석,조새벽,강문성,송영재,정소희,조정호 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Stimulus-response system and conscious response enable humans to respond to environmental changes. Inspired by human conscious response, we presents an artificial stimulus-response system capable of conscious response. The system is composed of an artificial visual receptor, artificial synapse, artificial neuron circuit, and an actuator. The artificial visual receptor with quantum dot layer generates the electrical pulse under light illumination. The artificial synapse with retentive electric double layer processes the electrical pulse signals to strengthen synaptic connections. The CMOS based artificial neuron circuit integrates synaptic output signal to activate the actuator. By incorporating these components, a series of conscious response process is demonstrated which reduces response time as a result of learning process. The demonstrated artificial stimulus-response system offers a promising research field providing an alternative to patients with neurological disorders.