Abstract
An exponential aluminum composition AlxGa1-xN nanowire array photocathode was proposed, and the photoemission and electronic collection characteristics of their nanostructured photoemitter were studied. The photoelectric conversion model is established based on the two-dimensional continuity equation derived from the corresponding boundary conditions, and the model is solved by the finite difference method in Matlab software. Generally, the photoelectric conversion efficiency of nanostructured emitters is better than that of planar emitters. In addition, the exponential nanowire emitter has the advantages of a continuous built-in electric field and an external electric field pulling structure to reconstruct the surface emission electron ratio and further enhance the overall electron collection efficiency. The exponentially doped cathode with the highest quantum efficiency (46.5%) is not as good as the exponential composition cathode (57.3%). In the process of rise the external electric field from 0 to 2.5 V/μm, the collection efficiency increased by 140%.
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