ELECTRON-TRANSPORT AND EMISSION PROPERTIES OF C(100)

Secondary-electron-emission spectroscopy is used to probe the transpor t and emission of impact-ionized electrons in single-crystal diamond. By studying the emission from a cesiated C(100) surface having a negat ive electron affinity (NEA), the full energy spectrum of the internal electrons is revealed in the measured energy distribution data. The ki netic energy of the electrons and the height of the surface energy bar rier are measured relative to the conduction-band minimum E-c, which i s identified in the spectra. The cesiated diamond surface is observed to be NEA, but the hydrogenated diamond surface (commonly believed to be NEA) has an electron affinity near zero and slightly positive. Anal ysis of the very high yield data (delta(max)similar to 132) and the sh arply peaked energy distribution data indicates that the transport of low-energy electrons is very efficient in C(100). An emission model is deduced that involves the surface properties of the material and the internal energy distribution of the electrons.