THERMALLY ENHANCED FIELD EMISSION

THERMALLY ENHANCED FIELD EMISSION

THERMALLY ENHANCED FIELD EMISSION
Process b of Figure 2.19 is thermally enhanced field emission or thermionic field emission. Thermally enhanced field emission is a direct tunneling process by which an electron is transferred from an allowed state in one material to an allowed state in another. It differs from field emission, which is also a direct tunneling process, in that field emission (path d) is not thermally assisted.30 Except for the higher semiconductor doping levels and lower temperatures, thermionic field emission is not expected to dominate over the parallel path of thermionic emission at semiconductor-metal interfaces.