%0 Journal Article
%A Maiti, Sonam
%A Ohlerth, Thorsten
%A Schmidt, Niclas
%A Aussen, Stephan
%A Waser, Rainer
%A Simon, Ulrich
%A Karthäuser, Silvia
%T Moisture Effect on the Threshold Switching of TOPO-Stabilized Sub-10 nm HfO 2 Nanocrystals in Nanoscale Devices
%J The journal of physical chemistry  / C
%V 126
%N 43
%@ 1932-7447
%C Washington, DC
%I Soc.
%M FZJ-2022-03689
%P 18571 - 18579
%D 2022
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000877343500001
%R 10.1021/acs.jpcc.2c06303
%U https://juser.fz-juelich.de/record/910212