The State Key Laboratory for New Ceramics & Fine Processing, School of Materials Science & Engineering, Tsinghua University, Beijing, 100084, China.
Nanoscale. 2017 Aug 10;9(31):11047-11054. doi: 10.1039/c7nr02334k.
The importance of tuning refractive index in a multilayer antireflection coating (ARC) system can not be denied. In practical applications, regulation of refractive index is complex due to limited choice and availability of appropriate materials for the trilayer AR coating assembly. To overcome this issue, we used a single inorganic material, HfO, for the construction of a trilayer AR light harvesting moth eye, resembling hierarchical nanostructure coatings, for exploring new generation photovoltaics and optoelectronic devices. In the trilayer AR HfO (TAR-H) assembly, using a glancing angle deposition technique (GLAD), the dense bottom layer was steadily changed into a spongy middle layer that further changed to a highly porous top layer micmiking a moth eye, reducing the refractive index of the coating from 1.87 to 1.30. The broadband omnidirectional properties of the TAR-H coating, with superior thermal stability and improved scratch resistance, in the visible wavelength range were experimentally demonstrated. The TAR-H coating on FTO and sapphire substrates achieved reflectance of up to <1% in the visible wavelength range.
在多层抗反射涂层（ARC）系统中，调整折射率的重要性不言而喻。在实际应用中，由于三层 AR 涂层组件中合适材料的选择和可用性有限，折射率的调节较为复杂。为了解决这个问题，我们使用了单一的无机材料 HfO，构建了类似于分层纳米结构涂层的三层 AR 光捕获蛾眼，用于探索新一代光伏和光电设备。在三层 AR HfO（TAR-H）组件中，我们使用掠角沉积技术（GLAD），将致密的底层稳定地转变为海绵状的中层，进一步转变为高度多孔的顶层，模拟蛾眼，将涂层的折射率从 1.87 降低到 1.30。实验证明，TAR-H 涂层在可见光范围内具有宽带各向同性特性，具有优异的热稳定性和耐磨性，在可见波长范围内，TAR-H 涂层在 FTO 和蓝宝石衬底上的反射率可低至<1%。
