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| Emission Performance of Scandate Cathodes Prepared by Pulse Laser Deposition |
| Peng Zhen①② Yin Sheng-yi① Zheng Qiang① Wang Xin-xin① Wang Yu① Li Yang① |
①(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)
②(University of Chinese Academy of Sciences, Beijing 100039, China) |
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Abstract In order to improve the emission performance of cathodes to meet the demands of new type devices, this paper develops a new-type scandate cathode coated with W+BaO-Sc2O3-SrO film prepared by Pulse Laser Deposition (PLD) technology. The experiment obtains emission current characteristics measured as a function of voltage and temperature and analyzes the emission mechanism. The test results indicate that at 1100 °C the current density of the new cathode reaches 305.5 A/cm2; and the layer of Ba-Sc-Sr-O is the key to this excellent performance. The abnormal Schottky effect that the cathode appears is also investigated by using semiconductor model.
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Received: 25 April 2013
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Corresponding Authors:
Peng Zhen
E-mail: pengzhen1130@163.com
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2014, Vol. 36 
