| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Curbing Charging Currents in Pulsed Field Emission by Prolonging Pulse Edges |
| Jin-Di Wei1, Yun-Hui Li2, Geng-Min Zhang1**, Jin Yang3, Ying-Jie Xing1, Wen-Sheng Zhou4 |
1Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871
2Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055
3Chang'an Communication Technology Co., Ltd., Beijing 102209
4SIP-UCLA Institute for Technology Advancement, Suzhou 215123
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| Cite this article: |
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Jin-Di Wei, Yun-Hui Li, Geng-Min Zhang et al 2018 Chin. Phys. Lett. 35 057901 |
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Abstract In field emission under a non-dc voltage, a displacement current is inevitable due to charging the cathode–anode condenser. Under an often-used square voltage pulse, in which the voltage rises from zero to a certain value abruptly, the charging current in the circuit is very large at the rising and falling edges. This large charging current makes measurement of the actual emissive current from the cathode difficult, constitutes a threat to the components in the circuit and causes attenuation of the emissive current within the pulse. To alleviate these drawbacks, trapezoid voltage pulses, whose rising edges are extended dramatically in comparison with square voltage pulses, are employed to extract the field emission. Under a trapezoid voltage pulse, the charging current is clearly lowered as expected. Furthermore, the heat generated by the charging current under the trapezoid voltage pulse is much smaller than that under the square voltage pulse. Hence the emissive current does not show any attenuation within the pulse. Finally, the average emissive currents are found to decrease with the repetition frequency of the pulses.
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Received: 17 January 2018
Published: 30 April 2018
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| PACS: |
79.70.+q
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(Field emission, ionization, evaporation, and desorption)
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84.30.Sk
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(Pulse and digital circuits)
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85.45.Db
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(Field emitters and arrays, cold electron emitters)
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| Fund: Supported by the Natural Science Foundation of Jiangsu Province of China under Grant Nos BK20161243 and BK20161242, and the National Natural Science Foundation of China under Grant No 61774007. |
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