Effect of interface barrier on carbon nanotube field emission property

Carbon nanotube was deposited on Si substrate which was intentionally covered with a certain thickness SiO2 layer as the interface barrier. A doublepotential barrier model was proposed and the tunneling probability of the two barriers in the external electric field was qualitatively discussed. The two variable tunneling probabilities of interface barrier and surface barrier are the reason of the nonlinearity of the Fowler-Nordheim(F-N) plots. The plots follow the F-N law in low electric field because the tunneling probability of interface barrier is larger than that of surface barrier. The plots do not follow the F-N law in high electric field because the tunneling probability of surface barrier is higher．