Journal Article

FZJ-2022-03689

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Moisture Effect on the Threshold Switching of TOPO-Stabilized Sub-10 nm HfO 2 Nanocrystals in Nanoscale Devices

Maiti, S. ; Ohlerth, T. ; Schmidt, N.FZJ* ; Aussen, S.FZJ* ; Waser, R.FZJ* ; Simon, U. ; Karthäuser, S. (Corresponding author)FZJ*

2022
Soc. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/32895  doi:10.1021/acs.jpcc.2c06303

Abstract: The enduring demand for ever-increasing storage capacities inspires the development of new few nanometer-sized, high-performance memory devices. In this work, tri-n-octylphosphine oxide (TOPO)-stabilized sub-10 nm monoclinic HfO2 nanocrystals (NC) with a rod-like and spherical shape are synthesized and used to build up microscale and nanoscale test devices. The electrical characterization of these devices studied by cyclic current–voltage measurements reveals a redox-like behavior in ambient atmosphere and volatile threshold switching in vacuum. By employing a thorough spectroscopic and surface analysis (FT-IR and NMR spectroscopy and XPS), the origin of this behavior was elucidated. While the redox behavior is enabled by residual moisture present during clean-up of the NC and thin film preparation, which leads to a partial desorption of TOPO from the NC surface, threshold switching is obtained for dry TOPO-stabilized HfO2 NC in microchannel as well as in nanoelectrode devices addressing only a few sub-10 nm TOPO-stabilized HfO2 NC. The results show that integration of sub-10 nm HfO2 NC in nanoscale devices is feasible to build up switching elements.

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Contributing Institute(s):

1. Elektronische Materialien (PGI-7)
2. JARA-FIT (JARA-FIT)
3. JARA Institut Green IT (PGI-10)

Research Program(s):

1. 5233 - Memristive Materials and Devices (POF4-523) (POF4-523)

Appears in the scientific report 2022

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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