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首页> 外文期刊>Journal of Vacuum Science & Technology >High-current, low-cost field emission triode using a reticulated vitreous carbon cathode
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High-current, low-cost field emission triode using a reticulated vitreous carbon cathode

机译：使用网状玻璃碳阴极的高电流，低成本场发射三极管

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摘要

A simple, macroscale field-emission triode was assembled using a single 3.8 mm diameter Ar~+-ion irradiated reticulated vitreous carbon (RVC) cathode. The irradiation process results in random carbon nanostructures on the surface of the RVC, providing effective, low-field emission sites. The use of RVC results in a self-ballasting cathode. The grid electrode further increases local field enhancement on the cathode surface, increasing the extracted current over what is produced in diode mode. The anode electric field required to produce 0.1 μA/cm~2 was measured to decrease from 0.9 to 0.65 V/μm with 300 V applied to the grid electrode. With 2.1 W/μm, and 300 V applied to the grid, the limits of our power supply were reached, and a current density of 16.0 mA/cm~2 and arncurrent of 1.82 mA from a single cathode were measured. Semiconductorlike emission properties, showing three regions of operation, were observed. In region III the cathode emits from a large number of sites, producing a total beam that is readily focused to a small spot size with ordinary electron optics. This low-cost, robust configuration, machined without microfabrication processes or lithography, makes very-high total current in single field-emission triodes possible.
机译：使用单个3.8毫米直径的Ar〜+离子辐照的网状玻璃碳（RVC）阴极组装了一个简单的宏观场发射三极管。辐照过程会在RVC的表面上产生随机的碳纳米结构，从而提供有效的低场发射点。使用RVC会导致自镇流阴极。栅极进一步增强了阴极表面的局部电场，从而增加了在二极管模式下产生的电流。测量产生0.1μA/ cm〜2所需的阳极电场，在向栅电极施加300 V电压的情况下，其电场强度从0.9降低至0.65 V /μm。在2.1 W /μm和300 V的电网电压下，达到了我们的电源极限，并且从单个阴极测得的电流密度为16.0 mA / cm〜2，电流为1.82 mA。观察到显示出三个工作区域的类半导体发射特性。在区域III中，阴极从大量位置发射，产生总束，该束很容易用普通电子光学器件聚焦到较小的光斑尺寸。这种低成本，坚固的配置无需机械加工或光刻即可进行机械加工，从而使单个场发射三极管中的总电流非常高。

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  • 来源
    《Journal of Vacuum Science & Technology》 |2010年第2期|C2C37-C2C40|共4页
  • 作者

    Arthur C. Carpenter; Charles E. Hunt;

  • 作者单位

    Department of Electrical and Computer Engineering, University of California, One Shields Avenue, Davis,California 95616;

    Department of Electrical and Computer Engineering, University of California, One Shields Avenue, Davis,California 95616;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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