Theoretical study on photoemission of two-dimensional variable-Al composition AlxGa1-xN nanorod array photocathode

Abstract

Abstract With the development of the application of sun-blind ultraviolet (UV) detectors, the research of photoelectric detection devices with high-efficiency solar blind detection performance has become a hot spot. Therefore, in order to meet this demand, we have studied AlxGa1-xN photocathode with dielectric wavelength tunable properties. Since the actual measured quantum efficiency is too different from the simulation calculation results, in order to solve the secondary absorption problem of the nanorod array photocathode, we propose to use a variable-Al composition AlxGa1-xN nanorod array structure as a solution. By establishing a two-dimensional photoemission model of AlxGa1-xN nanorod array photocathode with variable-Al composition, the effect of the built-in electric field generated by variable-Al composition on the top surface quantum efficiency of nanorods was analyzed. A variable-Al composition AlxGa1-xN nanorod array photocathode structure with excellent solar blind response characteristics was obtained. Therefore, the research in this paper can provide some theoretical references for the manufacture of vacuum solar blind UV detectors with high efficiency detection performance.