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Yiming Li - One of the best experts on this subject based on the ideXlab platform.

  • Optimization on configuration of surface Conduction Electron-emitters
    Microelectronics Reliability, 2010
    Co-Authors: Hui-wen Cheng, Yiming Li
    Abstract:

    Abstract In this work, a novel nanogap with inclined protrusion cathode in palladium strip fabricated by hydrogen absorption under high-pressure treatment is optimized for the surface Conduction Electron-emitter. Its field emission is sensitive to the geometry of surface Conduction Electron-emitters (SCE). For a specified emitter material, the SCE are further investigated by varying the thickness, tilted angle and gap of palladium (Pd). An optimal field emission efficiency with 80° tilted angle, 120 nm gap and 10 nm thickness of Pd is found for certain designed field emission efficiency. We further find that varying the emitter material work function of the emitter material from 5.12 eV to 3.9 eV will further improve the field emission property due to the increase of the emitted current.

  • Optimal Configuration of Hydrogen-Embrittlement-Fabricated Nanogaps for Surface-Conduction Electron-Emitter Display
    Nanotechnology, IEEE Transactions on, 2009
    Co-Authors: Yiming Li, Hui-wen Cheng
    Abstract:

    Application of nanogaps for Electron sources is fascinating in surface-Conduction Electron-emitter display. In contrast to rather complicated fabrication processes of the focused ion beam technique for the extremely narrow fissure, nanogaps fabricated by hydrogen embrittlement (HE) have thus been proposed as novel surface-Conduction Electron emitters due to their low turn-on voltage, high emission current, high focus capability, and high emission efficiency. In this paper, we theoretically investigate effects of the separation width and the tilted angle of the nanogaps fabricated by HE method on the field emission efficiency using a 3-D finite-difference time-domain particle-in-cell simulation technique. The structure with a large tilted angle may result in a high emitted current, but the collected current on the anode is suppressed due to the strong local field around the tip. A small structure prevents the emitted Electrons from spreading out, and thus, no current could be collected by the anode. Also, the structure with a wide (or a narrow) separation of gap weakens (or enhances) the field around the tip and reduces the collected Electrons. For better emission efficiency and focus capability, the separation width and the tilted angle of the examined structure could vary from 57 to 117 nm and 30deg to 60deg, respectively.

  • surface Conduction Electron emission in palladium hydrogenation nanogaps
    Journal of Physics D, 2008
    Co-Authors: Yiming Li, Hsiang-yu Lo
    Abstract:

    A nanometre scale gap (nanogap) structure in palladium strip fabricated by hydrogen absorption under high-pressure treatment was proposed and applied to the surface Conduction Electron emitter for flat panel displays. In this paper we demonstrate that the structure possesses different high field-emission efficiencies with low turn-on voltages and high focused capability, compared with the conventional type. An experimentally validated simulation is conducted to investigate the field-emission characteristics of the explored structure. It is observed the inclined sidewall and protrusion of this nanogap can enhance the local electric field and the focused capability and protect emission areas from being damaged by impurity ions during field-emission operation. This study benefits the advanced design of metallic electrodes in nanodevice technology for new types of Electron sources and display applications.

  • Field Emission Dependence on Nanogap Separation in Surface Conduction Electron-Emitter Display
    2008 8th IEEE Conference on Nanotechnology, 2008
    Co-Authors: Yiming Li, Hui-wen Cheng, Hsiang-yu Lo, Chih-hong Hwang, Mei-tsao Chiang, Chi-neng Mo
    Abstract:

    Nanogap nowadays is fascinating in surface Conduction Electron-emitters (SCEs) for Electron sources of the flat panel displays (FPDs). Surface Conduction Electron-emitter display (SED) is one of new type FPDs based on the SCEs. The nanogap fabricated by focused ion beam was studied, but the extremely narrow fissure complicated its fabrication. Palladium hydrogenation nanogaps have thus been proposed as a novel surface Conduction Electron-emitters for it low turn-on voltage, high emission current, high focused capability, and high emission efficiency. In this work, we investigate effects of nanogap separation width of the palladium hydrogenation nanogaps on the field emission efficiency using a finite-difference time domain particle-in-cell simulation method. The result of this study shows as the gap width increases, the field emission efficiency grows due to the larger space allows the particles attracted to the anode plate instead of attracting by the opposite electrode. Moreover, the study shows the better emission efficiency can be achieved under wider gap width, which reduces the difficulty of the fabrication.

  • Emission efficiency dependence on the tilted angle of nanogaps in surface Conduction Electron-emitter
    2008 International Conference on Simulation of Semiconductor Processes and Devices, 2008
    Co-Authors: Yiming Li, Hui-wen Cheng, Hsiang-yu Lo, Mei-tsao Chiang, Chi-neng Mo
    Abstract:

    In this work, the emission efficiency of the novel surface Conduction Electron-emitter corresponding to tilted angles (thetas) of the driving electrode is studied numerically. Due to the small angle, the emitter apex becomes significant and induces large electric field. The large electric field then attracts more particles into vacuum and then increases the emission current. However, the structure of the driving electrode limits the Electron trajectory while the angle decreases, and it reflects the portion of collected current by the anode decreases and makes a drop in emission efficiency. It shows there is the highest emission efficiency (about 37%) under an optimum angle thetas = 60deg. The result provides an insight into the relation between emission efficiency and emitter apex.

Hsiang-yu Lo - One of the best experts on this subject based on the ideXlab platform.

  • surface Conduction Electron emission in palladium hydrogenation nanogaps
    Journal of Physics D, 2008
    Co-Authors: Yiming Li, Hsiang-yu Lo
    Abstract:

    A nanometre scale gap (nanogap) structure in palladium strip fabricated by hydrogen absorption under high-pressure treatment was proposed and applied to the surface Conduction Electron emitter for flat panel displays. In this paper we demonstrate that the structure possesses different high field-emission efficiencies with low turn-on voltages and high focused capability, compared with the conventional type. An experimentally validated simulation is conducted to investigate the field-emission characteristics of the explored structure. It is observed the inclined sidewall and protrusion of this nanogap can enhance the local electric field and the focused capability and protect emission areas from being damaged by impurity ions during field-emission operation. This study benefits the advanced design of metallic electrodes in nanodevice technology for new types of Electron sources and display applications.

  • Field Emission Dependence on Nanogap Separation in Surface Conduction Electron-Emitter Display
    2008 8th IEEE Conference on Nanotechnology, 2008
    Co-Authors: Yiming Li, Hui-wen Cheng, Hsiang-yu Lo, Chih-hong Hwang, Mei-tsao Chiang, Chi-neng Mo
    Abstract:

    Nanogap nowadays is fascinating in surface Conduction Electron-emitters (SCEs) for Electron sources of the flat panel displays (FPDs). Surface Conduction Electron-emitter display (SED) is one of new type FPDs based on the SCEs. The nanogap fabricated by focused ion beam was studied, but the extremely narrow fissure complicated its fabrication. Palladium hydrogenation nanogaps have thus been proposed as a novel surface Conduction Electron-emitters for it low turn-on voltage, high emission current, high focused capability, and high emission efficiency. In this work, we investigate effects of nanogap separation width of the palladium hydrogenation nanogaps on the field emission efficiency using a finite-difference time domain particle-in-cell simulation method. The result of this study shows as the gap width increases, the field emission efficiency grows due to the larger space allows the particles attracted to the anode plate instead of attracting by the opposite electrode. Moreover, the study shows the better emission efficiency can be achieved under wider gap width, which reduces the difficulty of the fabrication.

  • Emission efficiency dependence on the tilted angle of nanogaps in surface Conduction Electron-emitter
    2008 International Conference on Simulation of Semiconductor Processes and Devices, 2008
    Co-Authors: Yiming Li, Hui-wen Cheng, Hsiang-yu Lo, Mei-tsao Chiang, Chi-neng Mo
    Abstract:

    In this work, the emission efficiency of the novel surface Conduction Electron-emitter corresponding to tilted angles (thetas) of the driving electrode is studied numerically. Due to the small angle, the emitter apex becomes significant and induces large electric field. The large electric field then attracts more particles into vacuum and then increases the emission current. However, the structure of the driving electrode limits the Electron trajectory while the angle decreases, and it reflects the portion of collected current by the anode decreases and makes a drop in emission efficiency. It shows there is the highest emission efficiency (about 37%) under an optimum angle thetas = 60deg. The result provides an insight into the relation between emission efficiency and emitter apex.

  • Effect of Process Variation on Field Emission Characteristics in Surface-Conduction Electron Emitters
    IEEE Transactions on Nanotechnology, 2008
    Co-Authors: Hsiang-yu Lo, Yiming Li, Chihhao Tsai, Hsueh-yung Chao
    Abstract:

    In this paper, we explore the effect of process variation on field emission characteristics in surface-Conduction Electron emitters. The structure of Pd thin-film emitter is fabricated on the substrate and the nanometer scale gap is formed by the focused ion beam technique. Different shapes of nanogaps due to the process variations are investigated by the experiment and three-dimensional Maxwell particle-in-cell simulation. Four deformation structures are examined, and it is found that the type 1 exhibits high emission efficiency due to a stronger electric field around the apex and larger emission current among structures. The Electron emission current is dependent upon the angle of inclination of surface. Hydrogen plasma treatment is also used to increase the edge roughness of the nanogap and thereby dramatically improve the field emission characteristics. For the nanogap with a separation of 90 nm, the turn-on voltage significantly reduces from 60 to 20 V after the hydrogen plasma treatment.

  • field emission properties of novel palladium nanogaps for surface Conduction Electron emitters
    Nanotechnology, 2007
    Co-Authors: Hsiang-yu Lo, Yiming Li, Hsueh-yung Chao, Chihhao Tsai
    Abstract:

    We explore novel nanometer-scale gaps with different widths in palladium (Pd) thin-film strips using hydrogen absorption under high-pressure conditions and different temperatures. Both the experimental measurement and numerical calculation are conducted to examine the Electron Conduction properties of the newly proposed surface Conduction Electron-emitters (SCEs). It is shown that this novel structure exhibits a high emission efficiency, so that a low turn-on voltage of 40 V for an SCE with a 30 nm nanogap is obtained. A calibrated model is adopted to predict the effects of the emitter thickness and different material work functions on emission current with different width of nanogaps. It is found that the heightened thickness increases the emission current. However, it tends to saturate for smaller nanogaps. The decrement of work function is proportional to the increase in emission current, which is independent of the width of nanogap.

Chihhao Tsai - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Process Variation on Field Emission Characteristics in Surface-Conduction Electron Emitters
    IEEE Transactions on Nanotechnology, 2008
    Co-Authors: Hsiang-yu Lo, Yiming Li, Chihhao Tsai, Hsueh-yung Chao
    Abstract:

    In this paper, we explore the effect of process variation on field emission characteristics in surface-Conduction Electron emitters. The structure of Pd thin-film emitter is fabricated on the substrate and the nanometer scale gap is formed by the focused ion beam technique. Different shapes of nanogaps due to the process variations are investigated by the experiment and three-dimensional Maxwell particle-in-cell simulation. Four deformation structures are examined, and it is found that the type 1 exhibits high emission efficiency due to a stronger electric field around the apex and larger emission current among structures. The Electron emission current is dependent upon the angle of inclination of surface. Hydrogen plasma treatment is also used to increase the edge roughness of the nanogap and thereby dramatically improve the field emission characteristics. For the nanogap with a separation of 90 nm, the turn-on voltage significantly reduces from 60 to 20 V after the hydrogen plasma treatment.

  • field emission properties of novel palladium nanogaps for surface Conduction Electron emitters
    Nanotechnology, 2007
    Co-Authors: Hsiang-yu Lo, Yiming Li, Hsueh-yung Chao, Chihhao Tsai
    Abstract:

    We explore novel nanometer-scale gaps with different widths in palladium (Pd) thin-film strips using hydrogen absorption under high-pressure conditions and different temperatures. Both the experimental measurement and numerical calculation are conducted to examine the Electron Conduction properties of the newly proposed surface Conduction Electron-emitters (SCEs). It is shown that this novel structure exhibits a high emission efficiency, so that a low turn-on voltage of 40 V for an SCE with a 30 nm nanogap is obtained. A calibrated model is adopted to predict the effects of the emitter thickness and different material work functions on emission current with different width of nanogaps. It is found that the heightened thickness increases the emission current. However, it tends to saturate for smaller nanogaps. The decrement of work function is proportional to the increase in emission current, which is independent of the width of nanogap.

  • nanogap formation by palladium hydrogenation for surface Conduction Electron emitters fabrication
    Applied Physics Letters, 2007
    Co-Authors: Chihhao Tsai, Kuanjung Chen, Chi-neng Mo
    Abstract:

    Nanometer-scale gaps in Pd strips are obtained by hydrogen absorption under high pressure treatment. The resulting lattice constant increase due to the Pd phase transformation after hydrogen uptake results in a large compressive stress on the thin Pd films. Under proper geometric arrangement of the Pd electrode within a surface Conduction Electron (SCE) emitter structure, a single nanogap per SCE device is obtained. A turn-on voltage of 41V is observed for emitters with a 25nm gap.

  • Effect of process variation on field emission characteristic in surface Conduction Electron-emitters
    2007 7th IEEE Conference on Nanotechnology (IEEE NANO), 2007
    Co-Authors: Hsiang-yu Lo, Yiming Li, Hsueh-yung Chao, Chihhao Tsai
    Abstract:

    In this work, we explore the effect of process variation on field emission characteristics in surface Conduction Electron-emitters. The structure of palladium thin-film emitter is fabricated on the substrate and the nanometer scaled gap is formed by the focused ion beam (FIB) technique. Different shapes of nanogaps due to the process variations are investigated by the experiment and 3D Maxwell particle-in-cell simulation. Four deformation structures are examined, and it is found that the Type 1 exhibits high emission efficiency due to a stronger electric field around the apex and larger the emission current among structures. The Electron emission current is dependent upon the angle of inclination of surface.

Chi-neng Mo - One of the best experts on this subject based on the ideXlab platform.

  • Field Emission Dependence on Nanogap Separation in Surface Conduction Electron-Emitter Display
    2008 8th IEEE Conference on Nanotechnology, 2008
    Co-Authors: Yiming Li, Hui-wen Cheng, Hsiang-yu Lo, Chih-hong Hwang, Mei-tsao Chiang, Chi-neng Mo
    Abstract:

    Nanogap nowadays is fascinating in surface Conduction Electron-emitters (SCEs) for Electron sources of the flat panel displays (FPDs). Surface Conduction Electron-emitter display (SED) is one of new type FPDs based on the SCEs. The nanogap fabricated by focused ion beam was studied, but the extremely narrow fissure complicated its fabrication. Palladium hydrogenation nanogaps have thus been proposed as a novel surface Conduction Electron-emitters for it low turn-on voltage, high emission current, high focused capability, and high emission efficiency. In this work, we investigate effects of nanogap separation width of the palladium hydrogenation nanogaps on the field emission efficiency using a finite-difference time domain particle-in-cell simulation method. The result of this study shows as the gap width increases, the field emission efficiency grows due to the larger space allows the particles attracted to the anode plate instead of attracting by the opposite electrode. Moreover, the study shows the better emission efficiency can be achieved under wider gap width, which reduces the difficulty of the fabrication.

  • Emission efficiency dependence on the tilted angle of nanogaps in surface Conduction Electron-emitter
    2008 International Conference on Simulation of Semiconductor Processes and Devices, 2008
    Co-Authors: Yiming Li, Hui-wen Cheng, Hsiang-yu Lo, Mei-tsao Chiang, Chi-neng Mo
    Abstract:

    In this work, the emission efficiency of the novel surface Conduction Electron-emitter corresponding to tilted angles (thetas) of the driving electrode is studied numerically. Due to the small angle, the emitter apex becomes significant and induces large electric field. The large electric field then attracts more particles into vacuum and then increases the emission current. However, the structure of the driving electrode limits the Electron trajectory while the angle decreases, and it reflects the portion of collected current by the anode decreases and makes a drop in emission efficiency. It shows there is the highest emission efficiency (about 37%) under an optimum angle thetas = 60deg. The result provides an insight into the relation between emission efficiency and emitter apex.

  • nanogap formation by palladium hydrogenation for surface Conduction Electron emitters fabrication
    Applied Physics Letters, 2007
    Co-Authors: Chihhao Tsai, Kuanjung Chen, Chi-neng Mo
    Abstract:

    Nanometer-scale gaps in Pd strips are obtained by hydrogen absorption under high pressure treatment. The resulting lattice constant increase due to the Pd phase transformation after hydrogen uptake results in a large compressive stress on the thin Pd films. Under proper geometric arrangement of the Pd electrode within a surface Conduction Electron (SCE) emitter structure, a single nanogap per SCE device is obtained. A turn-on voltage of 41V is observed for emitters with a 25nm gap.

Chi Li - One of the best experts on this subject based on the ideXlab platform.

  • a graphene based large area surface Conduction Electron emission display
    Carbon, 2013
    Co-Authors: Chi Li, Xiaobing Zhang, Matthew T Cole, Ke Qu, Shuyi Ding, Yan Zhang, Jamie H Warner, Baoping Wang, W I Milne
    Abstract:

    The fabrication and functionality of a 21 cm graphene-based transverse Electron emission display panel is presented. A screen-printed triode edge Electron emission geometry has been developed based on chemical vapor deposited (CVD) graphene supported on vertically aligned carbon nanotubes (CNT) necessary to minimize electrostatic shielding induced by the proximal bulk substrate. Integrated ZnO tetrapod Electron scatterers have been shown to increase the emission efficiency by more than 90%. Simulated Electron trajectories validate the observed emission characteristics with driving voltages less than 60 V. Fabricated display panels have shown real-time video capabilities that are hysteresis free (<0.2%), have extremely stable lifetimes (<3% variation over 10 h continuous operation) in addition to rapid temporal responses (<1 ms).

  • Surface Conduction Electron emission of ZnO nanostructures
    Nanotechnology, 2007
    Co-Authors: Chi Li, Xiaobing Zhang, Wei Gu, Daniel Den Engelsen
    Abstract:

    This paper describes a study on the surface Conduction Electron emission of ZnO tetrapods, which were synthesized by the oxidation of Zn vapor. With an insulator of thickness 100 µm, the turn-on voltage was 540 V in the surface Conduction structure and 750 V in the conventional cathode-gate field emission structure. At the same gate voltage, the surface Conduction structure had a much larger anode current density. It was found that electrical activation of the ZnO-tetrapod layer greatly enhanced the Electron emission. After activation, the turn-on voltage was 40 V, and the emission current density reached 0.49 mA cm−2 at an applied voltage of 150 V. A preliminary theory on the surface Conduction Electron emission of ZnO is presented.