CAJ | 학술논문

采用数值模拟的方法对比性地研究了常闭和常开工作模式下平面栅极型碳纳米管场发射电子源.静电场的数值计算结果显示:常闭工作模式下该电子源中阴极电极的表面电场分布不均匀,边缘处的高电场易导致其上的碳纳米管烧毁,从而引起场发射电流衰减.为了解决此问题,提出将常开工作模式用于该电子源,并证实常开工作模式能够用于该电子源,并有利于解决电流衰减问题.因此,相对于常闭工作模式,常开工作模式更适合平面栅极型碳纳米管场发射电子源.
채용수치모의적방법대비성지연구료상폐화상개공작모식하평면책겁형탄납미관장발사전자원.정전장적수치계산결과현시:상폐공작모식하해전자원중음겁전겁적표면전장분포불균균,변연처적고전장역도치기상적탄납미관소훼,종이인기장발사전류쇠감.위료해결차문제,제출장상개공작모식용우해전자원,병증실상개공작모식능구용우해전자원,병유리우해결전류쇠감문제.인차,상대우상폐공작모식,상개공작모식경괄합평면책겁형탄납미관장발사전자원.
The planar gate-type carbon nano-tube field emission electron sources operating in normally-off and normally-on modes were simulated in finite element method.The electric field distributions of the system were numerically calculated.The simulated results show that when the electron source works in normally-off operation modes,its field emission current gradually decays because the high electric field at the edges of the cathode often leads to burning of the carbon nanotubes.However,the normally-on operation mode can be an effective solution to the problem of current degradation on the basis of our simulation.We propose that the normally-on operation mode be more suitable than the normally-off operation mode for the planar gate-type carbon nano-tube field emission electron source.