Toward ultimate nonvolatile resistive memories: The mechanism behind ovonic threshold switching revealed.

Abstract:

:Fifty years after its discovery, the ovonic threshold switching (OTS) phenomenon, a unique nonlinear conductivity behavior observed in some chalcogenide glasses, has been recently the source of a real technological breakthrough in the field of data storage memories. This breakthrough was achieved because of the successful 3D integration of so-called OTS selector devices with innovative phase-change memories, both based on chalcogenide materials. This paves the way for storage class memories as well as neuromorphic circuits. We elucidate the mechanism behind OTS switching by new state-of-the-art materials using electrical, optical, and x-ray absorption experiments, as well as ab initio molecular dynamics simulations. The model explaining the switching mechanism occurring in amorphous OTS materials under electric field involves the metastable formation of newly introduced metavalent bonds. This model opens the way for design of improved OTS materials and for future types of applications such as brain-inspired computing.

journal_name

Sci Adv

journal_title

Science advances

authors

Noé P,Verdy A,d'Acapito F,Dory JB,Bernard M,Navarro G,Jager JB,Gaudin J,Raty JY

doi

10.1126/sciadv.aay2830

subject

Has Abstract

pub_date

2020-02-28 00:00:00

pages

eaay2830

issue

9

issn

2375-2548

pii

aay2830

journal_volume

6

pub_type

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