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Author: search.filters.author.Lin, Chun-ChiehSubject: search.filters.subject.Resistive switching

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Now showing 1 - 4 of 4
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    Effect of thermal treatment on resistive switching characteristics in Pt/Ti/Al2O3/Pt devices
    (2008-12-25)
    Lin, Chih-Yang
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    Lee, Dai-Ying
    ;
    Wang, Sheng-Yi
    ;
    Lin, Chun-Chieh
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    Tseng, Tseung-Yuen
    Resistive switching characteristics of Pt/Ti/Al2O3/Pt memory devices annealed at various temperatures including 400 degrees C, 500 degrees C and 600 degrees C for 1 h under ambient condition were investigated in the study. The Al2O3 thin films annealed at up to 600 degrees C for 1 h remain amorphous phase based on the X-ray diffraction (XRD) analyses. As increasing annealing temperature, the forming voltage (activating the pristine device) of the memory device decreases in contrast to the rising trend of the turn-on voltage (switching from high to low resistance state). However, the turn-off voltage (switching from low to high resistance state) is almost uninfluenced by thermal annealing. These phenomena might be attributed to the interdiffusion between Ti and Al2O3, based on the analyzed results of secondary ion mass spectroscopy (SIMS) and high resolution transmission electron microscope (HR-TEM). Moreover, the thermal annealing process eventually creates high conducting paths with a high density of oxygen vacancies between the two electrodes. (c) 2008 Elsevier B.V. All rights reserved.
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    Reproducible resistive switching behavior in sputtered CeO2 polycrystalline films
    (2008-12-25)
    Lin, Chih-Yang
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    Lee, Dai-Ying
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    Wang, Sheng-Yi
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    Lin, Chun-Chieh
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    Tseng, Tseung-Yuen
    Sputter-deposited CeO2 film in the metal-insulator-metal structure exhibits repeatable resistive switching behavior under voltage sweep. Based on the X-ray diffraction patterns and the cross-sectional scanning electron microscope image, the CeO2 film is polycrystalline with columnar grains perpendicular to the bottom electrode. Moreover, due to the symmetric device structure of Pt/CeO2/Pt, the resistive switching behavior is independent of bias polarity so that both positive and negative voltages can switch the device from high conducting state (ON-state) into low conducting state (OFF-state) and then back to ON-state, which is named non-polar resistive switching. The resistance ratio between two memory states is about five orders of magnitude, which is stable over 10(4) S at 0.3 V stress. in addition, the resistance ratio decreases with increasing the current compliance during forming process. The stability of ON-state, OFF-state, and as-deposited film state (the state before performing forming process) against temperature is also investigated in this study, showing that the OFF-state is less stable. (C) 2008 Elsevier B.V. All rights reserved.
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    Switching Failure Mechanism in Zinc Peroxide-Based Programmable Metallization Cell
    (2018-10-19)
    Simanjuntak, Firman Mangasa
    ;
    Chandrasekaran, Sridhar
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    Lin, Chun-Chieh
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    Tseng, Tseung-Yuen
    ;
    電子工程學系及電子研究所
    The impact of peroxide surface treatment on the resistive switching characteristics of zinc peroxide (ZnO2)-based programmable metallization cell (PMC) devices is investigated. The peroxide treatment results in a ZnO hexagonal to ZnO2 cubic phase transformation; however, an excessive treatment results in crystalline decomposition. The chemically synthesized ZnO2 promotes the occurrence of switching behavior in Cu/ZnO2/ZnO/ITO with much lower operation current as compared to the Cu/ZnO/ITO (control device). However, the switching stability degrades as performing the peroxide treatment for a longer time. We suggest that the microstructure of the ZnO2 is responsible for this degradation behavior and fine tuning on ZnO2 properties, which is necessary to achieve proper switching characteristics in ZnO2-based PMC devices.
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    Improved resistive switching properties of Ti/ZrO2/Pt memory devices for RRAM application
    (2011-07-01)
    Wang, Sheng-Yu
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    Tsai, Chen-Han
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    Lee, Dai-Ying
    ;
    Lin, Chih-Yang
    ;
    Lin, Chun-Chieh
    In this study, we have investigated the effect of current compliance during forming process on resistive switching (RS) characteristics of the Ti/ZrO2/Pt device. The higher the current compliance is, the larger RS operation voltage is needed. The Ti/ZrO2/Pt device with high device yield can be operated over 10,000 RS cycles by sweeping dc voltage. and the on and off two memory states exhibit good stability under 0.3 V stress voltage. Moreover, the data retention of both memory states is over 10(5) s. As applying +6-V 10-ns and -3-V 10-ns voltage pulses on the device, there are operation errors observed during continuous write-read-erase-read cycles until increasing the pulse width to 50 ns. Nondestructive readout tests are also performed on the Ti/ZrO2/Pt device before and after 10(3) pulse cycles without any obvious degradation observed. Compared with reported ZrO2-based memory devices, our Ti/ZrO2/Pt device exhibits better RS properties and has a high potential for memory application. (C) 2011 Elsevier B.V. All rights reserved.