We numerically studied the effect of the geometric structure and Al component on the optical capture performance of gradient Al component AlxGa1 − xN photocathodes. The effects of geometric parameters, such as base radius (R), wire-to-wire spacing, cone rate, and angle of incident light, on the optical response were systematically studied based on the finite element method. In the radial direction, we study the optical response of rectangular periodic structure and hexagonal periodic structure. Simulation results show that pencil nanostructure can achieve omnidirectional and broadband light absorption of AlxGa1 − xN nanowires with hexagonal periodic structure. In addition, we used the Spicer three-step emission model to establish the photoemission efficiency of the AlxGa1 − xN nanostructure. As a result, the photocathode achieves optimal quantum efficiency when the Al component is in the range of 0 to 0.75 and sublayer thickness of 240, 180, 120, and 60 nm.

中文翻译：

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梯度铝组分AlGaN纳米线用于紫外光电阴极的光学特性研究

我们数值研究了几何结构和Al组分对梯度Al组分AlxGa1-xN光电阴极的光学捕获性能的影响。基于有限元方法，系统地研究了几何参数（如基半径（R），线对线间距，锥角率和入射光角度）对光学响应的​​影响。在径向方向上，我们研究了矩形周期性结构和六角形周期性结构的光学响应。仿真结果表明，铅笔纳米结构可以实现具有六边形周期性结构的AlxGa1-xN纳米线的全向和宽带光吸收。此外，我们使用了Spicer三步发射模型来建立AlxGa1-xN纳米结构的光发射效率。因此，