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Title: Bidirectional threshold switching characteristics in Ag/ZrO{sub 2}/Pt electrochemical metallization cells

Abstract

A bidirectional threshold switching (TS) characteristic was demonstrated in Ag/ZrO{sub 2}/Pt electrochemical metallization cells by using the electrochemical active Ag electrode and appropriate programming operation strategies The volatile TS was stable and reproducible and the rectify ratio could be tuned to ∼10{sup 7} by engineering the compliance current. We infer that the volatile behavior is essentially due to the moisture absorption in the electron beam evaporated films, which remarkably improved the anodic oxidation as well as the migration of Ag{sup +} ions. The resultant electromotive force would act as a driving force for the metal filaments dissolution, leading to the spontaneous volatile characteristics. Moreover, conductance quantization behaviors were also achieved owing to formation and annihilation of atomic scale metal filaments in the film matrix. Our results illustrate that the Ag/ZrO{sub 2}/Pt device with superior TS performances is a promising candidate for selector applications in passive crossbar arrays.

Authors:
; ; ;  [1];  [2]
  1. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018 (China)
  2. Key Laboratory of Nanodevices and Applications, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Ruoshui Road 398, Suzhou 215123 (China)
Publication Date:
OSTI Identifier:
22611394
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 6; Journal Issue: 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; ANNIHILATION; CURRENTS; DISSOLUTION; ELECTROCHEMISTRY; ELECTROMOTIVE FORCE; ELECTRON BEAMS; ELECTRONS; FILAMENTS; FILMS; INDIUM FLUORIDES; METALS; MOISTURE; OXIDATION; PERFORMANCE; PLATINUM; QUANTIZATION; SILVER; ZIRCONIUM OXIDES

Citation Formats

Du, Gang, E-mail: dugang@hdu.edu.cn, Li, Hongxia, Mao, Qinan, Ji, Zhenguo, and Wang, Chao. Bidirectional threshold switching characteristics in Ag/ZrO{sub 2}/Pt electrochemical metallization cells. United States: N. p., 2016. Web. doi:10.1063/1.4961709.
Du, Gang, E-mail: dugang@hdu.edu.cn, Li, Hongxia, Mao, Qinan, Ji, Zhenguo, & Wang, Chao. Bidirectional threshold switching characteristics in Ag/ZrO{sub 2}/Pt electrochemical metallization cells. United States. doi:10.1063/1.4961709.
Du, Gang, E-mail: dugang@hdu.edu.cn, Li, Hongxia, Mao, Qinan, Ji, Zhenguo, and Wang, Chao. Mon . "Bidirectional threshold switching characteristics in Ag/ZrO{sub 2}/Pt electrochemical metallization cells". United States. doi:10.1063/1.4961709.
@article{osti_22611394,
title = {Bidirectional threshold switching characteristics in Ag/ZrO{sub 2}/Pt electrochemical metallization cells},
author = {Du, Gang, E-mail: dugang@hdu.edu.cn and Li, Hongxia and Mao, Qinan and Ji, Zhenguo and Wang, Chao},
abstractNote = {A bidirectional threshold switching (TS) characteristic was demonstrated in Ag/ZrO{sub 2}/Pt electrochemical metallization cells by using the electrochemical active Ag electrode and appropriate programming operation strategies The volatile TS was stable and reproducible and the rectify ratio could be tuned to ∼10{sup 7} by engineering the compliance current. We infer that the volatile behavior is essentially due to the moisture absorption in the electron beam evaporated films, which remarkably improved the anodic oxidation as well as the migration of Ag{sup +} ions. The resultant electromotive force would act as a driving force for the metal filaments dissolution, leading to the spontaneous volatile characteristics. Moreover, conductance quantization behaviors were also achieved owing to formation and annihilation of atomic scale metal filaments in the film matrix. Our results illustrate that the Ag/ZrO{sub 2}/Pt device with superior TS performances is a promising candidate for selector applications in passive crossbar arrays.},
doi = {10.1063/1.4961709},
journal = {AIP Advances},
number = 8,
volume = 6,
place = {United States},
year = {Mon Aug 15 00:00:00 EDT 2016},
month = {Mon Aug 15 00:00:00 EDT 2016}
}
  • In this study, we achieved bidirectional threshold switching (TS) for selector applications in a Ag-Cu{sub 2}O-based programmable-metallization-cell device by engineering the stack wherein Ag was intentionally incorporated in the oxide (Cu{sub 2}O) layer by a simple approach comprising co-sputtering and subsequent optimized annealing. The distribution of the Ag was directly confirmed by transmission electron microscopy and energy dispersive spectroscopy line profiling. The observed TS occurred because of the spontaneous self-rupturing of the unstable Ag filament that formed in the oxide layer.
  • The rate processes of electrochemical reactions were clarified in a CH{sub 4}-H{sub 2}O system at the interface of a porous Pt electrode/Y{sub 2}O{sub 3}-stabilized ZrO{sub 2} electrolyte. Direct-current polarization measurements and ac impedance spectroscopy were made with gas analysis before and after the reaction at 1,073 K. The authors proposed an analytical method to determine the rates of electrochemical reactions taking place in parallel. When the ratio p(H{sub 2}O)/p(CH{sub 4}) of the inlet gas was close to zero, the observed relationship between the polarization current and electrode potential was interpreted by the electrochemical oxidation processes of H{sub 2}, CO, C,more » and CH{sub 4} in parallel using the proposed method. For example, the ratio of the oxidation rates for C/CO/CH{sub 4}/H{sub 2} is 1/1.3 x 10/1.9 x 10{sup 2}/2.8 x 10{sup 3} at E = {minus}600 mV vs. air. The result was obtained under very low CH{sub 4} concentration. The estimated oxidation rates of H{sub 2} and CO as functions of the electrode potential were described by the model proposed by Mizusaki et al. for the reaction of H{sub 2}-H{sub 2}O and CO-CO{sub 2}.« less
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  • The effect of the incorporation of a metallic phase (Pt) into a superacid catalyst (SO {sup 2{minus}}{sub 4} - ZrO{sub 2}) for n-butane isomerization was studies. The convenience of supporting Pt directly on the super-acid or on alumina and of using the physical mixture as a catalyst was also analyzed. Pt supported on SO {sup 2{minus}}{sub 4} -ZrO{sub 2} has the same activity as So{sup 2{minus}}{sub 4} -ZrO{sub 2}, but the stability is increased. The bifunctional reaction mechanism is not operating because Pt does not have the metallic properties due to a strong interaction with the support under the experimentalmore » conditions of reduction (573 K). When Pt is supported on Al{sub 2}O{sub 3} and mixed mechanically with SO{sup 2{minus}}{sub 4} -ZrO{sub 2}, the activity and stability are increased due to the operation of the bifunctional mechanism. 14 refs., 5 figs., 3 tabs.« less
  • ZrO 2-Al 2O 3 and CeO 2-Al 2O 3 were prepared by a co-precipitation method and selected as supports for Pt catalysts. The effects of CeO 2 and ZrO 2 on the surface area and Brønsted acidity of Pt/Al 2O 3 were studied. In the hydrodeoxygenation (HDO) of p-cresol, the addition of ZrO 2 promoted the direct deoxygenation activity on Pt/ZrOO 2-Al 2O 3 via Caromatic-O bond scission without benzene ring saturation. Pt/CeOO 2-Al 2O 3 exhibited higher deoxygenation extent than Pt/Al 2O 3 due to the fact that Brønsted acid sites on the catalyst surface favored the adsorption ofmore » p-cresol. With the advantages of CeO 2 and ZrO 2 taken into consideration, CeO 2-ZrOO 2-Al 2O 3 was prepared, leading to the highest HDO activity of Pt/CeO 2-ZrOO 2-Al 2O 3. The deoxygenation extent for Pt/CeO 2-ZrOO 2-Al 2O 3 was 48.4% and 14.5% higher than that for Pt/ZrO2O 2-Al 2O 3 and Pt/CeOO 2-Al 2O 3, respectively.« less