Efficient light trapping in GaN inclined nanorod and nanohole arrays for photocathode applications

Abstract In this paper, COMSOL Multiphysics commercial software package based on the finite element method is used to design simulation models of GaN nanorod and nanohole arrays. The absorption differences of two types of nanostructure arrays in the ultraviolet band were studied. The influence of geometric parameters on the optical absorption properties of GaN nanostructure arrays were analyzed. The inclination of the nanostructure was changed to study the variation of the absorption performance of the inclined nanostructure arrays. Studies have shown that vertical nanohole arrays with a hexagonal arrangement are more likely to obtain high absorption, and inclined nanostructures can further improve the ability of light trapping. The simulation experiments of GaN nanorod and nanohole arrays provide some references for the structural design of photocathodes, which will help UV detectors obtain efficient light absorption.