铁电阴极电子发射的动态特性分析  

Analysis on the Dynamic Characteristics of Electron Emission from Ferroelectric Cathode

作　　者：蔡雪梅[1] 周应华[2] 

机构地区：[1]重庆邮电大学光电学院,重庆400065 [2]重庆邮电大学计算机学院,重庆400065

出　　处：《半导体技术》2009年第4期345-347,374,共4页Semiconductor Technology

基　　金：重庆市自然科学基金(CSTC2008BB4408)

摘　　要：主要研究了铁电阴极电子发射的动态特性,通过对收集到的激励电压和发射电流波形进行幅频特性和相频特性分析,得到电子发射的敏感频率区域为0.65～2 MHz。运用电子发射的极化反转机理,在以上动态特性分析结果的基础上,研究电子发射与极化之间存在的关系,得出转向极化对电子发射的贡献大,热离子极化对电子发射贡献小的结论。在以上结果基础上提出提高电子发射的两种途径:一是通过掺杂增加自由离子浓度,以提高热离子极化,从而提高电子发射;二是改进激励源的设计,使输出电压的频谱包含更多对电子发射频率敏感的成分。The dynamic characteristics of electron emission from the ferroelectric cathode were studied. By analyzing the amplitude and phase frequency response through the collected waveforms of the excited voltage and the emitted current, the sensitive frequency range of the electron emission about 0.65 to 2 MHzwas obtained. The relationship of the electron emission and the polarization was considered based on the fast polarization switch theory of ferroelectric electron emission and the above dynamic characteristics. The analyzed results are that the contribution of the thermionic polarization to the electron emission is bigger than that of the dipole orientation obtained. One is to increase polarization, thus two methods for improving the electron emission can be the concentration of free ions by doping and the electron emission will be increased as the thermionic polarization increased, the other is to improve the design of the excitation source, so the electron emission will be increased as the spectrum of the output voltage signals including more frequency components sensitive to electron emission.

关 键 词：铁电阴极 转向极化 热离子极化 动态特性 

分 类 号：O462[理学—电子物理学]