As one of the most widely used optical films, antireflective coating (ARC) is widely used in lasers, display screens and solar cells. In this article, the double-layer ARC coating consists of a bottom layer using SiO₂-TiO₂ composite nanomaterials and a top layer of SiO₂ modified with Hexamethyldisilazane (HMDS). The optimal parameters of the double-layer ARC were obtained through the simulation software Macleod. Meanwhile, the aging time of SiO₂ sol, the volume fraction of HMDS, the annealing temperature, the dip-coating speed, and the volume fraction of TiO₂, which affect the refractive index of the bottom and top layers, were explored in order to match the best parameters. By adjusting the structure of the bottom and top layers, the double-layer broadband ARC coating has a maximum transmittance of 97.6% in the 400-1800 nm spectral range, and an average transmittance of 96.0%. In addition, HMDS was used to modify the SiO₂ sol to obtain a double-layer ARC with superhydrophobic properties with a hydrophobic angle of 151.4°. After the high-temperature and high-humidity environment test, the antireflective performance of the double-layer ARC has not changed significantly, demonstrating the broad prospects for application in large outdoor solar photovoltaic power plants. Moreover, this work not only provides a new method for adjusting the refractive index of the coating, but also opens up a new way for the preparation of broadband ARC.

作为最广泛使用的光学膜之一，抗反射涂层（ARC）广泛用于激光器，显示屏和太阳能电池。在本文中，双层ARC涂层由使用SiO ₂ -TiO ₂复合纳米材料的底层和用六甲基二硅氮烷（HMDS）改性的SiO ₂顶层组成。双层ARC的最佳参数是通过仿真软件Macleod获得的。同时，SiO ₂溶胶的老化时间，HMDS的体积分数，退火温度，浸涂速度和TiO ₂的体积分数为了影响最佳参数，对影响底层和顶层折射率的材料进行了研究。通过调整底层和顶层的结构，双层宽带ARC涂层在400-1800 nm光谱范围内的最大透射率为97.6％，平均透射率为96.0％。此外，HMDS用于改性SiO ₂溶胶获得具有超疏水性能的疏水角为151.4°的双层ARC。经过高温高湿环境测试后，双层ARC的抗反射性能没有明显变化，证明了在大型室外太阳能光伏电站中的广阔应用前景。而且，这项工作不仅为调节涂层的折射率提供了一种新方法，而且为宽带ARC的制备开辟了一条新途径。