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Percolation threshold enables optical resistive‐memory switching and light‐tuneable synaptic learning in segregated nanocomposites

Jaafar, Ayoub H.; O'Neill, Mary; Kelly, Stephen M.; Verrelli, Emanuele; Kemp, Neil T.

Authors

Ayoub H. Jaafar

Mary O'Neill

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Dr Neil Kemp N.Kemp@hull.ac.uk
Director of Postgraduate Researchers (Physics and Mathematics), Senior Lecturer in Physics



Abstract

An optical memristor where the electrical resistance memory depends on the history of both the current flowing through the device and the irradiance of incident light onto it is demonstrated. It is based on a nanocomposite consisting of functionalized gold nanoparticles in an optically active azobenzene polymer matrix. The composite has an extremely low percolation threshold of 0.04% by volume for conductivity because of the aggregation of the conducting nanoparticles into filamentary nanochannels. Optical irradiation results in photomechanical switching through expansion of the thin film from above to below the percolation threshold, giving a large LOW/HIGH resistance ratio of 103. The device acts as an artificial synapse, the conductivity or plasticity of which can be independently modulated, either electrically or optically, to enable tunable and reconfigurable synaptic circuits for brain‐inspired artificial intelligent or visual memory arrays. The lifetime of the resistive‐memory states is also optically controllable, which enables spatial modulation of long‐ and short‐term memory.

Citation

Jaafar, A. H., O'Neill, M., Kelly, S. M., Verrelli, E., & Kemp, N. T. (2019). Percolation threshold enables optical resistive‐memory switching and light‐tuneable synaptic learning in segregated nanocomposites. Advanced Electronic Materials, 5(7), https://doi.org/10.1002/aelm.201900197

Journal Article Type Article
Acceptance Date May 2, 2019
Online Publication Date May 28, 2019
Publication Date Jul 1, 2019
Deposit Date Jul 3, 2019
Publicly Available Date May 29, 2020
Journal Advanced Electronic Materials
Print ISSN 2199-160X
Electronic ISSN 2199-160X
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 5
Issue 7
Article Number 1900197
DOI https://doi.org/10.1002/aelm.201900197
Keywords Electronic, Optical and Magnetic Materials
Public URL https://hull-repository.worktribe.com/output/1866750
Publisher URL https://onlinelibrary.wiley.com/doi/abs/10.1002/aelm.201900197

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