Rest Gas Properties in Field Emission Devices with nano scale ZnO emitters
In sealed Field Emission (FE) devices, the emission currents of Zinc Oxide (ZnO) cold cathode degrade continually at set anode voltages. However, with the same cathode, more stable current was observed under an ultra high vacuum (UHV) level. This means the residual gases in the devices play an important role in degrading the emission current of ZnO cathodes. To investigate the gas condition in the sealed FEdevices with ZnO cathodes, a vacuum system with a quadrupole mass spectrometer (QMS) was employed. The QMS data were recorded before and after the gas in the FE-device going into the vacuum system. Based on these QMS data obtained, the following conclusions can be drawn: the residual gases in ZnOFE-devices are H2, CH4, CO, Ar and CO2. The residual gases affect the emission currents of ZnO FE-devices by changing the work function at the cathode surface, as can be seen from the FN curves of the same cathode tested both in the device and in UHV chamber.
Jinchan Wang
School of Electronic and Information Engineering, Henan University of Science and Technology, Luoyang, China, 471003
国际会议
长春
英文
1-4
2011-08-29（万方平台首次上网日期，不代表论文的发表时间）