Abstract
Abstract In this paper, we study the effect of geometric structure of gradient Al component AlxGa1-xN nanowires on their optical response. Based on the finite element simulation software Comsol Multiphysics, we systematically studied the optical properties of different geometric parameters of base radius (R), axis inclination (θ) and Angle of incident light (AOI). In the radial mode, we investigate the optical response of nanopillar and nanohole. Simulation results show that the AlxGa1-xN cathode can be omnidirectional and unified broadband light absorption by pillar nanostructured arrays with an axial inclination of 24°. In addition, Three-step Spicer emission model was used to establish the photoemission efficiency of graded Al component AlxGa1-xN nanostructure. All these findings not only indicate that the gradient Al component AlxGa1-xN material has a significant potential advantage over the UV photocathode, but it also provides an effective broadband and omnidirectional light absorption UV photocathode.
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