低功函数阴极涂层的场发射

N. Sule, M. Kirley, B. Novaković, J. Scharer, I. Knezevic, J. Booske
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引用次数: 0

摘要

本文报道了铜刀口阴极(CKE)裸阴极和涂覆低功函数(2.6 eV)六硼化镧(LaB6)薄膜的场发射实验和分析。裸CKE阴极在高场强下表现出空间电荷限制发射电流的特征。LaB6涂层阴极表现出非线性的Fowler-Nordhiem (FN)型发射。从场发射数据中观察到一个中间饱和区,在升高(185℃)时更为突出。令人惊讶的是,LaB6涂层阴极比高功函数(> 4 eV)的裸CKE阴极发射更少的电流。提出了一个假设和相应的模型,包括场发射和Cu衬底通过LaB6薄膜的固态电子传输,以解释实验结果。
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Field emission from low-work function cathode coatings
We report experiments and analysis of field emission from copper knife-edge (CKE) cathodes, both bare and coated with low work function (2.6 eV) Lanthanum hexaboride (LaB6) thin films. The bare CKE cathode exhibits evidence of space charge limited emission currents at high field strengths. The LaB6 coated cathodes exhibit a nonlinear Fowler-Nordhiem (FN) type emission. An intermediate saturation region is observed from field emission data, which is more prominent at elevated (185 C) temperature. Surprisingly, the LaB6 coated cathodes are observed to emit less current than the higher work function (> 4 eV) bare CKE cathode. A hypothesis and corresponding model including both field emission and solid state electron transport from the Cu substrate, through the LaB6 thin film, is proposed to explain the experimental observations.
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