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Title:

Directed Assembly of Nanoparticle Threshold Selector Arrays

Document type:
Zeitschriftenaufsatz
Author(s):
Speckbacher, M.; Rinderle, M.; Kaiser, W.; Osman, E.A.; Chryssikos, D.; Cattani-Scholz, A.; Gibbs, J.M.; Gagliardi, A.; Tornow, M.
Abstract:
The directed assembly of ordered arrays of cubic silver nanoparticles featuring distinct electrical threshold-switching characteristics is reported. Threshold selectors are key elements for nonvolatile resistive random-access-memory architectures, as they suppress sneak path currents in crosspoint arrays. Nanocubes are site-selectively immobilized on a TiO2-coated silicon surface via a complementary molecular surface functionalization of nanoparticles and substrate based on a Cu(I)-catalyzed alkyne-azide cycloaddition without any physical template. Electrical characterization of individual silver nanocubes by conductive-probe atomic force microscopy reveals pronounced and reproducible threshold-switching behavior, featuring ultralow OFF currents below 1 pA, steep turn-on slopes of <50 mV dec−1 and ON-OFF ratios in excess of 103. Numerical simulation of Ag-ion migration dynamics in the TiO2 electrolyte using a kinetic Monte Carlo model supports a switching mechanism based on conductive filament formation from Ag nanoclusters, and their reversible rupture in the low-voltage regime. Assembled Ag nanocube threshold selectors are proposed for applications in memristive memory architectures, in particular for future highly integrated 3D circuitry.
Dewey Decimal Classification:
500 Naturwissenschaften
Journal title:
Adv. Electron.Mater. , 5, 1900098 2019-05
Year:
2019
Year / month:
2019-05
Quarter:
2. Quartal
Month:
May
Reviewed:
ja
Language:
en
Fulltext / DOI:
doi:10.1002/aelm.201900098
WWW:
https://onlinelibrary.wiley.com/doi/10.1002/aelm.201900098
Publisher:
Wiley Online Library
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