Field emission negative electrode structure with current-limiting PN junctions

Abstract

The invention provides a field emission negative electrode structure with current-limiting PN junctions. The field emission negative electrode structure comprises a substrate, a conductive layer above the substrate, a P type semiconductor layer above the conductive layer, an N type semiconductor layer above the P type semiconductor layer and negative electrode emitters above the N type semiconductor layer, wherein a PN junction is formed by the P type semiconductor layer and the N type semiconductor layer; and the PN junction is in a reverse bias state when the negative electrode is in use. According to the field emission negative electrode structure, based on the characteristic that when the PN is under a certain reverse bias voltage, the flowing current barely changes along with the changes of the reverse bias voltage, one PN junction is connected below each emission unit in the filed emission array in series, so that the emission current of each unit is balanced; therefore, the stability and the uniformity of the emission current of the field emission negative electrode array are improved; the burnout of a part of the emitters caused by overhigh loads is avoided; the service life of the device is prolonged; and the general emission capability of the negative electrode is improved.

Description

technical field [0001] The invention belongs to the field of electron emission technology, in particular to field electron emission cold cathode technology. Background technique [0002] An ideal practical field electron emission cathode should have characteristics such as low threshold voltage, high current density, uniform and stable emission current, and these characteristics mainly depend on the cell structure, array density and emission of the field electron emission cathode. properties of bulk materials. In terms of unit structure, the electric field intensity at the tip of the emitter should be increased as much as possible while ensuring a low driving voltage and a stable emission current. [0003] However, due to various reasons, it is difficult to ensure that each field emission unit has the same emission capability, resulting in inconsistent emission currents provided by different emitters in the field emission array cathode (Field emission array, FEA). The tall...

AI Technical Summary

Problems solved by technology

However, it is difficult to achieve the same field emission performance of each emitter at present, so it is necessary to limit the maximum current of each emission unit of the field emission array, avoid part of the emitter from being burned due to excessive load, and improve the uniformity and stability of field emission sex

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