Nitrogen-doped titanium dioxide nanorod array memristors with synaptic features and tunable memory lifetime for neuromorphic computing
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Release time:2022-06-08 Impact Factor:5.316 DOI number:10.1016/j.jallcom.2021.159194 Affiliation of Author(s):中南大学 Journal:Journal of Alloys and Compounds Key Words:Memristor
Titanium dioxide
Nitrogen-doped
Tunable memory lifetime Abstract: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. First Author:Y. Yu Indexed by:Journal paper Correspondence Author:C.Jiang Discipline:Engineering First-Level Discipline:Materials Science and Engineering Document Type:J Volume:868 Issue:159194 ISSN No.:0925-8388 Translation or Not:no Date of Publication:2021-02-11 Included Journals:SCI Links to published journals:https://www.sciencedirect.com/journal/journal-of-alloys-and-compounds -
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