Photoreduction of Ag+ in Ag/Ag2S/Au memristor

•The effect of illumination on the operating voltages and switching speed of Ag/Ag2S/Au memristors is studied•Illumination decreased the average switching time from high to low resistance states by ∼19% and decreased the turn-off voltages dramatically from −0.8V to −0.25V.•Photo-induced reduction of...

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Bibliographic Details
Published in:Applied surface science 2015-06, Vol.340, p.138-142
Main Authors: Mou, N.I., Tabib-Azar, M.
Format: Article
Language:English
Subjects:
Electric potential
Illumination
Memory devices
Memristor
Optical memories
Photochemistry
Resistors
Silver
Switching
Three dimensional
Voltage
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Summary:•The effect of illumination on the operating voltages and switching speed of Ag/Ag2S/Au memristors is studied•Illumination decreased the average switching time from high to low resistance states by ∼19% and decreased the turn-off voltages dramatically from −0.8V to −0.25V.•Photo-induced reduction of silver in Ag2S may be used in three dimensional optical memories that can be electronically read and reset.•Illumination changed sulfur's valency and modified its oxidation/reduction potential. Silver halides and chalcogenides are excellent memristor materials that have been extensively used in the past as photosensitive layers in photography. Here we examine the effect of illumination on the operating voltages and switching speed of Ag/Ag2S/Au memristors using a green laser (473–523nm). Our results indicate that illumination decreases the average switching time from high to low resistance states by ∼19% and decreases the turn-off voltages dramatically from −0.8V to −0.25V that we attribute to the change in sulfur valency and a photo-induced change in its oxidation/reduction potential. Photo-induced reduction of silver in Ag2S may be used in three dimensional optical memories that can be electronically read and reset.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2015.02.038