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. ISSN 1010-6030, DOI https://doi.org/10.1016/j.jphotochem.2020.112914.

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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 con-duction, possibly involving hydrogen-bonding. Upon UV irradiation at similar to 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.

Item Type: Article
Funders: Ministry of Higher Education of Malaysia through the Fundamental Research Grant Scheme [FP079-2018A], Ministerio de Economia y Competitividad (MINECO) [BES-2015-071235] [MAT2014-55205-P], Universiti Malaya [RF004B-2018], Royal Academy of Engineering - UK [NRCP1516/4/61], University of Aberdeen [SF10192], Carnegie Trust for the Universities of Scotland [RIG008586], Royal Society of London European Commission [RGSR1201397], Royal Society of London [M19-0000], Specac Ltd. [RGSR1201397]
Uncontrolled Keywords: Azobenzene; Photochromic molecules; Hydrogen-bonding; Dielectric spectroscopy; Conductivity; Memory device
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: Ms Zaharah Ramly
Date Deposited: 29 Jul 2022 02:52
Last Modified: 29 Jul 2022 02:52
URI: http://eprints.um.edu.my/id/eprint/28259

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