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Polymer/TiO2Nanorod Nanocomposite Optical Memristor Device

Jaafar, A. H.; Al Chawa, M. M.; Cheng, F.; Kelly, S. M.; Picos, R.; Tetzlaff, R.; Kemp, N. T.

Authors

A. H. Jaafar

M. M. Al Chawa

F. Cheng

R. Picos

R. Tetzlaff

N. T. Kemp



Abstract

Modulation of resistive switching memory by light opens the route to new optoelectronic devices that can be controlled both optically and electronically. Applications include integrated circuits with memory elements switchable by light and neuromorphic computing with optically reconfigurable and tunable synaptic circuits. We report on a unique nanocomposite resistive switching material and device made from a low concentration (∼0.1% by mass) of titanium dioxide nanorods (TiO2-NRs) embedded within the azobenzene polymer, poly(disperse red 1 acrylate, PDR1A). The device exhibits both reversible electronic memristor switching and reversible polarization-dependent optical switching. Optical irradiation by circularly polarized light causes a trans-cis photochemical isomerization that modifies the conformation and orientation of the photoactive azo-unit within the polymer. The resulting expansion of the composite (PDR1A/TiO2-NR) polymer film modifies the conduction pathway, facilitated by the presence of the TiO2-NRs, as a semiconductor material, through the (PDR1A/TiO2-NR) polymer film, which provides a sensitive means to control resistive switching in the device. The effect is reversible by changing the polarization state of the incident light. A charge-flux memristor model successfully reproduces the current-voltage hysteresis loops and threshold switching properties of the device, as well as the effect of the illumination on the electrical characteristics.

Citation

Jaafar, A. H., Al Chawa, M. M., Cheng, F., Kelly, S. M., Picos, R., Tetzlaff, R., & Kemp, N. T. (2021). Polymer/TiO2Nanorod Nanocomposite Optical Memristor Device. Journal of physical chemistry. C, 125(27), 14965–14973. https://doi.org/10.1021/acs.jpcc.1c02799

Journal Article Type Article
Acceptance Date Jun 16, 2021
Online Publication Date Jun 30, 2021
Publication Date Jul 15, 2021
Deposit Date Jul 2, 2021
Publicly Available Date Jul 1, 2022
Journal Journal of Physical Chemistry C
Print ISSN 1932-7447
Electronic ISSN 1932-7455
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 125
Issue 27
Pages 14965–14973
DOI https://doi.org/10.1021/acs.jpcc.1c02799
Keywords Oxides; Light; Memristors; Electrical conductivity; Polymers
Public URL https://hull-repository.worktribe.com/output/3796463