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Yoon, Tae-Sik
Nano Semiconductor Research Lab.
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Tri-state resistive switching characteristics of MnO/Ta2O5 resistive random access memory device by a controllable reset process

Author(s)
Lee, N. J.Kang, T. S.Hu, Q.Lee, T. S.Yoon, Tae-SikLee, H. H.Yoo, E. J.Choi, Y. J.Kang, C. J.
Issued Date
2018-06
DOI
10.1088/1361-6463/aabb77
URI
https://scholarworks.unist.ac.kr/handle/201301/50204
Citation
JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.51, no.22
Abstract
Tri-state resistive switching characteristics of bilayer resistive random access memory devices based on manganese oxide (MnO)/tantalum oxide (Ta2O5) have been studied. The current-voltage (I-V) characteristics of the Ag/MnO/Ta2O5/Pt device show tri-state resistive switching (RS) behavior with a high resistance state (HRS), intermediate resistance state (IRS), and low resistance state (LRS), which are controlled by the reset process. The MnO/Ta2O5 film shows bipolar RS behavior through the formation and rupture of conducting filaments without the forming process. The device shows reproducible and stable RS both from the HRS to the LRS and from the IRS to the LRS. In order to elucidate the tri-state RS mechanism in the Ag/MnO/Ta2O5/Pt device, transmission electron microscope (TEM) images are measured in the LRS, IRS and HRS. White lines like dendrites are observed in the Ta2O5 film in both the LRS and the IRS. Poole-Frenkel conduction, space charge limited conduction, and Ohmic conduction are proposed as the dominant conduction mechanisms for the Ag/MnO/Ta2O5/Pt device based on the obtained I-V characteristics and TEM images.
Publisher
IOP PUBLISHING LTD
ISSN
0022-3727
Keyword (Author)
tri-state resistive switchingtantalum oxidemanganese oxideRRAM
Keyword
BILAYER STRUCTURE2-STEP RESETPERFORMANCEBEHAVIORSRRAM

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