Modeling of field-assisted emission from a negative electron affinity cathode
Modeling of field-assisted emission from a negative electron affinity cathode
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DOI：
10.1116/1.2404683
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发表时间：
2007-01
影响因子：
1.4
通讯作者：
A. Mayer;M. Chung;N. Kumar;B. Weiss;N. Miskovsky;P. H. Cutler
中科院分区：
文献类型：
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作者：
A. Mayer;M. Chung;N. Kumar;B. Weiss;N. Miskovsky;P. H. Cutler
最近报道了一种装置[M]。W. Geis等人，苹果。理论物理。leet . 87, 192115(2005)]，其中电子在被发射到真空之前通过负电子亲和玻璃基板的图像状态。这种发射所需的外场可能低至10V / cm，比其他材料和结构所遇到的场低三个数量级。作者对该器件进行了描述和分析，包括玻璃衬底和金属触点。该模型还解释了玻璃中铯的电离。考虑两个阶段：(i)通过玻璃建立200V偏置的激活步骤和（ii）操作状态，其中电子从金属接触到玻璃表面的转移被捕获在玻璃中的正离子增强。结果提供了对被困在玻璃中的正电荷的作用的深入了解。结果表明，遇到的条件是……
A device has been reported recently [M. W. Geis et al., Appl. Phys. Lett. 87, 192115 (2005)] in which electrons transit through the image states of a negative electron affinity glass substrate before being emitted to the vacuum. The external field required for this emission may be as low as 10V∕cm, which is up to three orders of magnitude lower than the fields encountered with other materials and configurations. The authors present a description and analysis of this device, which includes the glass substrate and the metallic contacts. The model also accounts for the ionization of cesium in the glass. Two stages are considered: (i) the activation step in which a 200V bias is established through the glass and (ii) the operational state in which the transfer of electrons from the metallic contacts to the glass surface is enhanced by positive ions trapped in the glass. The results provide insight into the role of the positive charges trapped in the glass. It is shown that the conditions are encountered, both ...