Abstract
GaAs nanowire arrays with variable Al content can effectively improve the photoelectric emission of nanowires due to the existence of internal electric field. Metal particles adsorb nanowires, which can excite local plasmons and enhance the optical absorption of nanowires. In this paper, the Al content change of Al_xGa_ (1-x) As material and metal particle adsorption are combined to study the light absorption and quantum efficiency of the Al_xGa_ (1-x) As nanowire array with metal particles adsorbed on the surface. Based on the finite element method and COMSOL multiphysics software, the effects of the number of metal nanoparticles, the distribution of particles, array period and particle size on the optical properties of the array are analyzed. The results show that metal particle adsorption can enhance the light capture ability of Al_xGa_(1-x) As nanowires arrays, the absorption of short wave light can be improved by adding adsorption particles layer by layer. Higher quantum efficiency can be obtained by appropriately increasing the array period and the diameter of metal particles of the structure.
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