Jiang Xiaoyun, Wang Tao, Zhong Qingfang, Yan Ruoqin, Huang Xing
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
Nanotechnology. 2020 Jul 31;31(31):315202. doi: 10.1088/1361-6528/ab88ee. Epub 2020 Apr 14.
A near-ideal solar absorber, which is composed of a metal nanowire array and a planar multilayer system, is proposed and investigated. Both numerical and analytical results show that the proposed nanostructure can achieve over 90% optical absorption throughout the wavelength range of 300-1909 nm due to the coupled effect of multiple resonance modes, and can maintain a good absorption stability over a wide incident angle regardless of the polarization states. Meanwhile, for practical applications, the total photothermal conversion efficiency can reach 95.57% at operating temperature of 373.15 K, which is particularly useful in solar energy harvesting. The absorption performance is also strongly dependent on the diameter and height of nanowire as well as the thicknesses of dielectric layers, enabling the further improvement of both the operating bandwidth and absorption efficiency. Moreover, by adjusting the period of the multilayer or nanowire materials, the selective absorption properties of this nanostructure can be flexibly controlled to satisfy more spectral requirements. These features make the presented designs hold promise for a series of solar-dependent optical applications, such as photothermal energy generation and thermal emitters.
提出并研究了一种由金属纳米线阵列和平面多层系统组成的近理想太阳能吸收器。数值和分析结果均表明，由于多种共振模式的耦合效应，所提出的纳米结构在300 - 1909 nm波长范围内可实现超过90%的光吸收，并且无论偏振态如何，在宽入射角范围内都能保持良好的吸收稳定性。同时，对于实际应用，在373.15 K的工作温度下，总光热转换效率可达95.57%，这在太阳能收集方面特别有用。吸收性能还强烈依赖于纳米线的直径和高度以及介电层的厚度，从而能够进一步提高工作带宽和吸收效率。此外，通过调整多层或纳米线材料的周期，可以灵活控制这种纳米结构的选择性吸收特性，以满足更多的光谱要求。这些特性使得所提出的设计在一系列依赖太阳能的光学应用中具有前景，如光热发电和热发射器。
