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Ⅰ引论 负电子亲和势光电发射体和次级电子发射体是一种新型的发射体,在本文中,我们将讲座它们在签象强管中的应用。我们通过和普通发射体作比较来突出负电子亲和势发射体的特点。从新近研制的象管测得的性能数据说明应用初期的水平。 负电子亲和势是某些半导体表面的一种状态——真空能级低于半导体块内导带的最低能级,负电子亲和势是通过在原子级洁净度表面上吸附正电性元素,而且在某些情况下再吸附负电性元素,形成降低真空能级的偶电层来实现的。因为表面没有阻滞电子逸出的正能量势,所以导带中的电子可逸入到真空中去。
I. INTRODUCTION Negative electron affinity photoemission emitters and secondary electron emitters are a new type of emitter. In this article, we will discuss their use in tagging tubes. We highlight the characteristics of negative-electron affinity emitters by comparison with ordinary emitters. Performance data from the newly developed tube shows the initial level of application. Negative electron affinity is a state of some semiconductor surfaces - the vacuum level is lower than the lowest level of the conduction band in the semiconductor block, and the negative electron affinity is obtained by adsorbing the positive charge element on the atomic cleanliness surface , But also in some cases re-adsorption of negative electrical elements to form the vacuum level to reduce the even layer to achieve. Because the surface has no positive energy potential that blocks electrons from escaping, the electrons in the conduction band can escape into the vacuum.