当前位置: X-MOL 学术J. Nanophotonics › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Optimal design of compositionally graded Al xGa1−xN nanostructure for optical absorption of UV photocathode
Journal of Nanophotonics ( IF 1.5 ) Pub Date : 2021-01-01 , DOI: 10.1117/1.jnp.15.016003
Zhisheng Lv 1 , Lei Liu 1 , Xingyue Zhangyang 1 , Feifei Lu 1 , Jian Tian 1
Affiliation  

We numerically analyzed the influence of geometric structures of gradient Al component AlxGa1 − xN nanowire on their light-trapping properties, ranging from nanopillars, inverted conical frustums, to inverted hexagonal frustums. COMSOL® Multiphysics package based on the finite element method is used to systematically study the effects of geometric parameters such as base radii (R), pillar height (H), period (P), and angle of incident light on the optical absorption. The simulation results show that compared with the other nanostructure counterparts, the inverted hexagonal frustum can effectively couple photons into the nanoarrays to achieve wide spectrum and effective optical absorption for AlxGa1 − xN nanowire-based UV photocathode. The inverted hexagon frustum with optimum height can obtain an optical absorption above 95% over a wide wavelength of 200 to 380 nm and a broad angle of incident light between 0 deg and 70 deg. All these findings not only show that the gradient Al component AlxGa1 − xN material has a great potential advantage for the UV photocathode, but it also provides an efficient broadband and omni-directional light trappers for the UV photocathode.

中文翻译:

紫外光阴极光吸收的组成梯度Al x Ga 1- x N纳米结构的优化设计

我们数值分析了梯度Al组分AlxGa1-xN纳米线的几何结构对它们的光捕获特性的影响,从纳米柱,倒圆锥形截头圆锥体到倒六角形截头圆锥体。基于有限元方法的COMSOL®Multiphysics软件包用于系统研究几何参数(例如基半径(R),柱高(H),周期(P)和入射光角度)对光吸收的影响。仿真结果表明,与其他纳米结构相比,倒置的六角形截头锥体可以有效地将光子耦合到纳米阵列中,从而获得基于AlxGa1-xN纳米线的UV光电阴极的宽光谱和有效的光吸收。具有最佳高度的倒置六边形视锥,可以在200至380 nm的宽波长和0度至70度的宽入射角范围内获得95%以上的光吸收。所有这些发现不仅表明梯度Al组分AlxGa1-xN材料对于UV光电阴极具有巨大的潜在优势,而且还为UV光电阴极提供了有效的宽带和全向光阱。
更新日期:2021-01-19
down
wechat
bug