1 School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China; 2 Department of Physics, Shanghai Polytechnic University, Shanghai 201209, China
Abstract A tunable selective emitter with hollow zigzag SiO2 metamaterials, which are deposited on Si3N4 and Ag film, is proposed and numerically investigated for achieving excellent radiative cooling effects. The average emissivity reaches a high value of 98.7% in the atmospheric window and possesses a high reflectivity of 92.0% in the solar spectrum. To reveal the enhanced absorptivity, the confined electric field distribution is investigated, and it can be well explained by moth eye effects. Moreover, tunable emissivity can also be initiated with different incident angles and it stays above 83% when the incident angle is less than 80°, embodying the excellent cooling performance in the atmospheric transparency window. Its net cooling power achieves 100.6 W·m-2, with a temperature drop of 13°, and the cooling behavior can persist in the presence of non-radiative heat exchange conditions. Therefore, high and tunable selective emitters based on our designed structure could provide a new route to realizing high-performance radiative cooling. This work is also of great significance for saving energy and environmental protection.
Fund: Project supported by the Natural Science Foundation of Henan Educational Committee (Grant No. 21A140026).
Corresponding Authors:
Chunzhen Fan
E-mail: chunzhen@zzu.edu.cn
Cite this article:
Huawei Yao(姚华伟), Xiaoxia Wang(王晓霞), Huaiyuan Yin(殷怀远), Yuanlin Jia(贾渊琳), Yong Gao(高勇), Junqiao Wang(王俊俏), and Chunzhen Fan(范春珍) Efficient realization of daytime radiative cooling with hollow zigzag SiO2 metamaterials 2021 Chin. Phys. B 30 064214
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