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Thin-film design of amorphous hafnium oxide nanocomposites enabling strong interfacial resistive switching uniformity
Univ Cambridge, England.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. Univ Cambridge, England; Univ Cambridge, England.ORCID iD: 0000-0002-3083-7536
Purdue Univ, IN 47907 USA.
Univ Cambridge, England.
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2023 (English)In: Science Advances, E-ISSN 2375-2548, Vol. 9, no 25, article id eadg1946Article in journal (Refereed) Published
Abstract [en]

A design concept of phase-separated amorphous nanocomposite thin films is presented that realizes interfacial resistive switching (RS) in hafnium oxide-based devices. The films are formed by incorporating an average of 7% Ba into hafnium oxide during pulsed laser deposition at temperatures <= 400 degrees C. The added Ba prevents the films from crystallizing and leads to similar to 20-nm-thin films consisting of an amorphous HfOx host matrix interspersed with similar to 2-nm-wide, similar to 5-to-10-nm-pitch Ba-rich amorphous nanocolumns penetrating approximately two-thirds through the films. This restricts the RS to an interfacial Schottky-like energy barrier whose magnitude is tuned by ionic migration under an applied electric field. Resulting devices achieve stable cycle-to-cycle, device-to-device, and sample-to-sample reproducibility with a measured switching endurance of >= 10(4) cycles for a memory window >= 10 at switching voltages of +/- 2 V. Each device can be set to multiple intermediate resistance states, which enables synaptic spike-timing-dependent plasticity. The presented concept unlocks additional design variables for RS devices.

Place, publisher, year, edition, pages
AMER ASSOC ADVANCEMENT SCIENCE , 2023. Vol. 9, no 25, article id eadg1946
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-197410DOI: 10.1126/sciadv.adg1946ISI: 001029333500028PubMedID: 37343094OAI: oai:DiVA.org:liu-197410DiVA, id: diva2:1796270
Note

Funding Agencies|EPSRC; U.S. National Science Foundation [EP/T012218/1-ECCS-EPSRC, ECCS-1902644, ECCS-1902623]; University of Cambridge [EU-H2020-ERC-ADG 882929]; Royal Academy of Engineering [CIET1819_24]; Swedish Research Council [2019-00191, 2021-00357]; Cambridge Herchel Smith postdoctoral fellowship; Royal Academy of Engineering in the form of a Senior Research Fellowship; NNSAs Laboratory Directed Research and Development Program; U.S. Department of Energys NNSA [89233218CNA000001]

Available from: 2023-09-12 Created: 2023-09-12 Last updated: 2024-02-08

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