Nitrogen-doped titanium dioxide nanorod array memristors with synaptic features and tunable memory lifetime for neuromorphic computing
发布时间：2022-06-08
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影响因子：5.316
DOI码：10.1016/j.jallcom.2021.159194
所属单位：中南大学
发表刊物：Journal of Alloys and Compounds
关键字：Memristor Titanium dioxide Nitrogen-doped Tunable memory lifetime
摘要：Titanium dioxide memristors are promising next generation devices for neuromorphic computing, which can mimic synapses of human brain. With respect to meet satisfactory performance, gradual conductance changes and stability of cycling are essential. In this work, nitrogen-doped titanium dioxide nanorod arrays (N-TiO2 NARs) memristors with high performance have been fabricated using a hydrothermal process. The X-ray photo electron spectra confirm the existence of Ti‒N bonds, with uniform distribution of nitrogen confirmed by elemental mapping. The bidirectional gradually changing conductance and endurance of over 8000 cycles have been achieved. The ratio of high resistance state (HRS) and low resistance state (LRS) exceeds 16. The synaptic features, such as potentiation, depression, paired pulse facilitation (PPF), experience-learning and STDP have been achieved using continuous sweeping voltage and pulse trains respectively. It is possible to emulate the learning processes by stimulating the memristor using pulses of different amplitude, duration and interval. By manipulating the stimulation pulse duration, voltage and current compliance, memory lifetimes (MLTs) can be tuned from seconds to tens of thousands of seconds. These transitional processes are associated with anion vacancy creation/accumulation and diffusion. Those synaptic features and tunable MLTs provide a promising approach for neuromorphic computing.
第一作者：Y. Yu
论文类型：期刊论文
通讯作者：C.Jiang
学科门类：工学
一级学科：材料科学与工程
文献类型：J
卷号：868
期号：159194
ISSN号：0925-8388
是否译文：否
发表时间：2021-02-11
收录刊物：SCI
发布期刊链接：https://www.sciencedirect.com/journal/journal-of-alloys-and-compounds