Enhanced Field Emission from the Contact between Metal and Dielectric
We have investigated the enhanced field emission at the contact between metal and dielectric. Such a strong enhancement of field emission has been often observed as a breakdown and is considered to be due to dielectric 1. It seems that the enhancement of emission has two reasons 2. One is the polarization of dielectric due to the charge on the metal. The polarization charges, in return, attract free charges on the metal toward the junction, which leads to the high surface chare density near the junction. The other is the space charges produced by the very enhanced field, in dielectric. Due to a lot of space charges, the contact barrier between metal and dielectric is thinned and lowered, which leads to the production of a detour path from metal through dielectric to vacuum. The detour path can be more preferable by the view of potential energy than the direct path from metal-vacuum. We evaluate the two effects to explain the enhancement of field emission in problem.
M.S.Chung B.-G.Yoon A.Mayer B.L.Weiss N.M.Miskovsky P.H.Cutler
Department of Physics, University of Ulsan, Ulsan 680-749, Republic of Korea FUNDP-University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA
国际会议
2010 8th International Vacuum Electron Sources Conference and NANOcarbon(第八届真空电子源和纳米碳国际会议)
南京
英文
21-22
2010-10-14（万方平台首次上网日期，不代表论文的发表时间）