Precise weight tuning in quantum dot-based resistive-switching memory for neuromorphic systems.

IF 12.2 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Materials Horizons Pub Date : 2024-11-14 DOI:10.1039/d4mh01182a

Gyeongpyo Kim, Doheon Yoo, Hyojin So, Seoyoung Park, Sungjoon Kim, Min-Jae Choi, Sungjun Kim

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引用次数: 0

Abstract

In this study, nonvolatile bipolar resistive switching and synaptic emulation behaviors are performed in an InGaP quantum dots (QDs)/HfO₂-based memristor device. First, the physical and chemical properties of InGaP QDs are investigated by high-resolution transmission electron microscopy and spectrophotometric analysis. Through comparative experiments, it is proven that the HfO₂ layer improves the variations in resistive switching characteristics. Additionally, the Al/QDs/HfO₂/ITO device exhibits reversible switching performances with excellent data retention. Fast switching speeds in the order of nanoseconds were confirmed, which could be explained by trapping/detrapping and quantum tunneling effects by the trap provided by nanoscale InGaP QDs. In addition, the operating voltage is decreased when the device is exposed to ultraviolet light for low-power switching. Biological synapse features such as spike-timing-dependent plasticity are emulated for neuromorphic systems. Finally, the incremental step pulse using proven algorithm method enabled the implementation of four-bit states (16 states), markedly enhancing the inference precision of neuromorphic systems.

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用于神经形态系统的基于量子点的电阻开关存储器的精确权重调整。

本研究在基于 InGaP 量子点（QDs）/HfO2 的忆阻器器件中实现了非易失性双极电阻开关和突触仿真行为。首先，通过高分辨率透射电子显微镜和分光光度分析研究了 InGaP 量子点的物理和化学特性。通过对比实验证明，HfO2 层改善了电阻开关特性的变化。此外，Al/QDs/HfO2/ITO 器件具有可逆开关性能和出色的数据保持能力。纳米级 InGaP QDs 提供的阱和量子隧穿效应可以解释这种快速开关速度。此外，当器件暴露在紫外线下进行低功耗开关时，工作电压会降低。神经形态系统仿真了生物突触的特征，如依赖于尖峰计时的可塑性。最后，利用经过验证的算法方法，增量阶跃脉冲实现了四位状态（16 个状态），显著提高了神经形态系统的推理精度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Horizons CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

18.90

自引率

2.30%

发文量

306

审稿时长

1.3 months

期刊介绍： Materials Horizons is a leading journal in materials science that focuses on publishing exceptionally high-quality and innovative research. The journal prioritizes original research that introduces new concepts or ways of thinking, rather than solely reporting technological advancements. However, groundbreaking articles featuring record-breaking material performance may also be published. To be considered for publication, the work must be of significant interest to our community-spanning readership. Starting from 2021, all articles published in Materials Horizons will be indexed in MEDLINE©. The journal publishes various types of articles, including Communications, Reviews, Opinion pieces, Focus articles, and Comments. It serves as a core journal for researchers from academia, government, and industry across all areas of materials research. Materials Horizons is a Transformative Journal and compliant with Plan S. It has an impact factor of 13.3 and is indexed in MEDLINE.