Abstract
Voltage-dependent field emission energy distribution (V-FEED) and current versus voltage measurements were performed on Mo tips coated with intrinsic cubic boron nitride (c-BN) to determine the origin of the field-emitted electrons. Spectra were collected from the Mo emitters under ultrahigh vacuum conditions both before and after being coated. In some instances multiple FEED peaks were observed in the collected spectra. These corresponded to multiple emission sites on the emitter. The energy of the field-emitted electrons from the c-BN-coated emitters usually depended linearly upon the applied voltage and could be explained using a simplified band-bending model. However, at higher voltages the FEED measured from the c-BN-coated emitters departed from this linear behavior. These nonlinearities were attributed to a contact resistance at the Mo/c-BN interface which had a greater influence on the energy distribution of emitted electrons at larger emission currents.
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