In this work, wideband graphene-based near-infrared solar absorber with rectangular sawtooth at the outer edge of the C-shaped structure is proposed. The C-shaped with rectangular sawtooth metasurface provides better absorption in the near-infrared region (NIR) from 0.81 μm to 1.07 μm. The metallic resonators made up of tungsten and graphene monolayer helps to improve the absorption in the gaps of structure with an efficiency of 91.8% at NIR region. The design is also compared with rectangular sawtooth on the outer edge and the inner edge of the C-shaped design. The numerical analysis is further investigated with the change in design parameters like the height of metasurface design (T), height of dielectric layer (S), width of C-shaped on metasurface (W), and the height of bottom layer (B) to observe the effect on absorption band. The design is also insensitive with the change in the angle of incidence such that proposed solar absorber can be used from energy harvesting.

在这项工作中，提出了在C形结构的外边缘具有矩形锯齿的宽带石墨烯基近红外太阳能吸收器。具有矩形锯齿形超表面的C形可在0.81μm至1.07μm的近红外区域（NIR）提供更好的吸收。由钨和石墨烯单层组成的金属谐振器有助于改善结构间隙中的吸收，在NIR区域的效率为91.8％。该设计还与C形设计的外边缘和内边缘的矩形锯齿进行了比较。通过设计参数的变化进一步研究了数值分析，这些参数包括：超表面设计高度（T），介电层高度（S），超表面C形宽度（W）和底层高度（B）观察对吸收带的影响。