Electrode Structure of Ferroelectric Electron Emitter
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Abstract
A novel electron emitter utilizing the characteristics of ferroelectric ceramic materials has been developed. The electron-emitting portion of the electron emitter has a unique microstructure that has a vacuum gap between the upper electrode and the surface of the ferroelectric layer. We confirmed electron emission by a three-step process that consists of (the first step) electron charge, (the second step) charge retention, and (the third step) electron emission. The asymmetric property of ferroelectric hysteresis in the process indicates the following results. In the first step, an electron charge is performed in synchrony with the polarization reversal of the ferroelectric layer. On the other hand, in the third step, the electric field in the vacuum gap advances the electron emission while the polarization reversal is performed in the ferroelectric layer.