半导体学报2008，Vol.29Issue(8)：1479-1483,5.
表面势垒形状对NEA光阴极电子能量分布的影响
Effect of Surface Potential Barrier on the Electron Energy Distribution of NEA Photocathodes
摘要
Abstract
By calculating the energy distribution of electrons reaching the photocathode surface and solving the Schrodinger equation that describes the behavior of an electron tunneling through the surface potential barrier,we obtain an equation to calculate the emitted electron energy distribution of transmission-mode NEA GaAs photocathodes.Accord-ing to the equation,we study the effect of cathode surface potential barrier on the electron energy distribution and find a significant effect of the barrier-I thickness or end height,especially the thickness,on the quantum efficiency of the cath-ode.Barrier II has an effect on the electron energy spread,and an increase in the vacuum level will lead to a narrower electron energy spread while sacrificing a certain amount of cathode quantum efficiency.The equation is also used to fit the measured electron energy distribution curve of the transmission-mode cathode and the parameters of the surface barri-er are obtained from the fitting.The theoretical curve is in good agreement with the experimental curve.关键词
NEA光阴极/表面势垒/透射系数/电子能量分布/量子效率Key words
NEA photocathode/surface potential barrier/transmission coefficient/electron energy distribution/quan-turn efficiency分类
电子信息工程引用本文复制引用
邹继军,杨智,乔建良,常本康,曾一平..表面势垒形状对NEA光阴极电子能量分布的影响[J].半导体学报,2008,29(8):1479-1483,5.基金项目
国家自然科学基金(批准号:60678043),江西省自然科学基金(批准号:2007GQS0412)和江西省教育厅科技计划(批准号:GJJ08298)资助项目 （批准号:60678043）
Project supported by the National Natural Science Foundation of China (No.60678043),the Natural Science Foundation of Jiangxi Province(No.GJJ08298) （No.60678043）
