Nanometer-Scale Uniform Conductance Switching in Molecular Memristors.
conductive atomic force microscopy
memristor
tip enhanced Raman spectroscopy
transition metal complex
uniformity
Journal
Advanced materials (Deerfield Beach, Fla.)
ISSN: 1521-4095
Titre abrégé: Adv Mater
Pays: Germany
ID NLM: 9885358
Informations de publication
Date de publication:
Oct 2020
Oct 2020
Historique:
received:
27
06
2020
revised:
02
08
2020
pubmed:
8
9
2020
medline:
8
9
2020
entrez:
7
9
2020
Statut:
ppublish
Résumé
One common challenge highlighted in almost every review article on organic resistive memory is the lack of areal switching uniformity. This, in fact, is a puzzle because a molecular switching mechanism should ideally be isotropic and produce homogeneous current switching free from electroforming. Such a demonstration, however, remains elusive to date. The reports attempting to characterize a nanoscopic picture of switching in molecular films show random current spikes, just opposite to the expectation. Here, this longstanding conundrum is resolved by demonstrating 100% spatially homogeneous current switching (driven by molecular redox) in memristors based on Ru-complexes of azo-aromatic ligands. Through a concurrent nanoscopic spatial mapping using conductive atomic force microscopy and in operando tip-enhanced Raman spectroscopy (both with resolution <7 nm), it is shown that molecular switching in the films is uniform from hundreds of micrometers down to the nanoscale and that conductance value exactly correlates with spectroscopically determined molecular redox states. This provides a deterministic molecular route to obtain spatially homogeneous, forming-free switching that can conceivably overcome the chronic problems of robustness, consistency, reproducibility, and scalability in organic memristors.
Identifiants
pubmed: 32893411
doi: 10.1002/adma.202004370
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e2004370Subventions
Organisme : National Research Foundation Singapore
ID : NRF-CRP15-2015-01
Organisme : SERB
ID : SR/S2/JCB-09/2011
Organisme : SERB
ID : EMR/2014/000520
Organisme : Texas A and M University
Organisme : Agency for Science, Technology and Research
ID : A1983c0034
Informations de copyright
© 2020 Wiley-VCH GmbH.
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