| Pb(Zr0.8Ti0.2)O3강유전 음극에서 비대칭 전극구조가 전자 방출 특성에 미치는 영향 |
| 박지훈, 김용태, 윤기현, 김태희1, 박경봉1 |
연세대학교 세라믹공학과
1안동대학교 재료공학부 |
| Effect of Asymmetric Electrode Structure on Electron Emission of the Pb(Zr0.8Ti0.2)O3 Ferroelectric Cathode |
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| ABSTRACT |
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To investigate the electrode structural effect on the ferroelectric electron emission, the electric field distribution in a 2-dimensional structure was calculated as a function of upper electrode diameter, and the switching charge density and emission charge were measured simultaneously. The simulation of the electric field distribution showed that an asymmetric electrode structure could cause a stray field on the bare surface of the ferroelectric cathode near the edge of upper electrode. The distance of stray field from the electrode edge increased with increasing ferroelectric thickness, but it did not depend on the upper electrode diameter. The switching charge density increased more on the cathode with smaller upper electrode diameter. This was attributed to the stray field on the bare ferroelectric surface near the electrode edge, because the stray field for the asymmetric ferroelectric cathode enhanced polarization switching near the electrode edge. From the switching charge density, the distance of stray field from the electrode edge was calculated as about 11-14${mu}{textrm}{m}$. The threshold voltage of electron emission was 61-68 kV/cm, which was almost 3 times lager than the coercive voltage. The threshold voltage was not determined just by coercive voltage, but by strength and distance of the stray-field, which largely depended on the geometrical structure of ferroelectric cathode. |
| Key words:
Ferroelectric, Electron emission, PZT, Cathode |
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