2023 Departmental Poster Competition

The transport of photogenerated electrons in copper under the influence of an external electric field is analyzed through Monte Carlo simulations. The electron distribution at the surface, accounting for the scattering mechanisms during transport, is investigated. Internal potential profiles are determined using a density functional approach, and the one-dimensional Schrödinger wave equation is numerically solved with the Numerov technique to obtain appropriate wave functions at the emitting surface. Current density is then calculated utilizing the transmission coefficient and electronic distribution. To boost current output, an array of emitters is utilized, and consideration is given to the use of high aspect ratio materials like carbon nanotubes (CNTs) for enhanced electric field effects at emitter tips. Charge screening effects, and field distortion due to proximity effects associated with neighboring emitters are comprehensively taken into account. This leads to electric field reductions at the emitter tips due to the presence of other emitters. Theoretical framework is grounded in the Fowler-Nordheim equation for electron field emission. Various applications would benefit from this research, including flat panel displays, X-ray tube sources, cathode ray lamps, electron sources for microwave generation, and nanolithography, among others.