A new light-responsive resistive random-access memory device containing hydrogen-bonded complexes

Velayutham, Thamil Selvi and Azmina, M.S. and Manickam Achari, Vijayan and Roche, Alejandro and Ramesh, Rinaa and Martinez-Felipe, Alfonso (2021) A new light-responsive resistive random-access memory device containing hydrogen-bonded complexes. Journal of Photochemistry and Photobiology A: Chemistry, 404. p. 112914. ISSN 1010-6030, DOI https://doi.org/10.1016/j.jphotochem.2020.112914.

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Official URL: https://doi.org/10.1016/j.jphotochem.2020.112914


In the search to obtain new and more efficient components of memory devices, we report the photochromic, dielectric and electrochemical response of a light-responsive organic compound, and its memory performance under electrical fields. The so-called N(1)-[12-(4-(4′-isobutyloxyphenyldiazo)phenoxy)dodecyloxy)]thymine, tAZOi, molecule contains one azobenzene group, which provides with photochromic character, and one terminal thymine group, capable to form hydrogen bonds and assemble supramolecular dimers, (tAZOi)2. We have calculated the optical absorption coefficient, extinction coefficient and refractive index of tAZOi, which obeys the single oscillator Wemple–DiDomenico model. An ITO/tAZOi/Al device has been prepared and presents two switchable conductance states with preservation of memory performance. The mechanism linked to the resistive random-access memory (RRAM) has been evaluated by molecular modelling and is controlled by p-type conduction, possibly involving hydrogen-bonding. Upon UV irradiation at ∼ 365 nm, tAZOi displays an increase in the complex permittivity driven by trans-to-cis (E-to-Z) isomerisation of the azobenzene groups. Molecular simulations suggest that conductivity and device performance can be enhanced (and controlled) by light exposure through the formation of activated Z isomers that could transfer charge to other neighbouring molecules, resulting in photo-electric responsive devices. © 2020 Elsevier B.V.

Item Type: Article
Funders: Ministry of Higher Education of Malaysia through the Fundamental Research Grant Scheme [ FP079-2018A ], Ministerio de Economía y Competitividad (MINECO) for PhD grant BES-2015-071235, under the project MAT2014-55205-P, University Malaya for the grant RF004B-2018, Royal Academy of Engineering, U.K., for the grant NRCP1516/4/61 (Newton Research Collaboration Programme), University of Aberdeen, for the award of the grant SF10192, Carnegie Trust for the Universities of Scotland, for the Research Incentive Grant RIG008586, Royal Society and Specac Ltd. , for the Research Grant RGSR1201397, Royal Society of Chemistry for the award of a mobility grant ( M19-0000 )
Uncontrolled Keywords: Azobenzene; Photochromic molecules; Hydrogen-bonding; Dielectric spectroscopy; Conductivity; Memory device
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Q Science > QH Natural history
Divisions: Faculty of Science > Department of Physics
Faculty of Science > Institute of Biological Sciences
Faculty of Science > Department of Chemistry
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 07 May 2021 02:31
Last Modified: 07 May 2021 02:31
URI: http://eprints.um.edu.my/id/eprint/25963

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