Abstract Designing and manufacturing cost-effective absorbers that can cover the full-spectrum of solar irradiation is still critically important for solar harvesting. Utilizing control of the lightwave reflection and transmission, metamaterials realize high absorption over a relatively wide bandwidth. Here, a truncated circular cone metasurface (TCCM) composed of alternating multiple layers of titanium (Ti) and silicon dioxide (SiO2) is presented. Enabled by the synergetic of surface plasmon resonances and Fabry-Pérot resonances, the TCCM simultaneously achieves high absorptivity (exceed 90%), and absorption broadband covers almost the entire solar irradiation spectrum. In addition, the novel absorber exhibits great photo-thermal property. By exploiting the ultrahigh melting point of Ti and SiO2, high-efficiency solar irradiation absorption and heat release have been achieved at 700℃ when the solar concentration ratio is 500 (i.e., incident light intensity at 5×105 W/m2). It is worth noting that the photo-thermal efficiency is almost unchanged when the incident angle increases from 0° to 45°. The outstanding capacity for solar harvesting and light-to-heat reported in this paper suggests that TCCM has great potential in photothermal therapies, solar desalination, and radiative cooling, etc.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11804134 and 11464019) and the Natural Science Foundation of Jiangxi Province, China (Grant No. 20202BBEL53036).
Corresponding Authors:
Zhengqi Liu, Guiqiang Liu
E-mail: zliu@jxnu.edu.cn;liugq@jxnu.edu.cn
Cite this article:
Zhefu Liao(廖喆夫), Zhengqi Liu(刘正奇), Qizhao Wu(吴起兆), Xiaoshan Liu(刘晓山), Xuefeng Zhan(詹学峰), Gaorong Zeng(曾高荣), and Guiqiang Liu(刘桂强) Solar energy full-spectrum perfect absorption and efficient photo-thermal generation 2021 Chin. Phys. B 30 084206
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