Spatially-Segmented Colored Radiative Cooler With Angle-Robustness

IEEE Photonics Journal

Gil Ju Lee¹  Young Min Song²  Se-Yeon Heo²  Dong Hyun Seo²  Do Hyeon Kim² 

[1] Department of Electronics Engineering, Pusan National University, Busan, Republic of Korea;School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea;

关键词: Angle robustness;    colored cooler;    metal-insulator-metal;    optical resonator;    radiative cooling;   

DOI  :  10.1109/JPHOT.2022.3155715

来源: DOAJ

【 摘 要 】

Conventional radiative cooling devices are white or silver in color to achieve high reflectance in the solar spectral range. However, a versatile color that can be applied to the radiative cooler is required for practical application. To determine the boundary between coloration and cooling performance, the reflectance in the visible range should be fine-tuned. Here, this paper presents a spatially-segmented colored radiative cooler (SSCRC), which is a 2-dimensional micro-patterning of colored areas, with angle-robustness. By using the metal-insulator-metal (MIM) optical resonator incorporating high refractive index dielectric (i.e., TiO₂), the SSCRC shows consistent coloration in a wide-angle ranging up to 70°. In addition, the spatial segmentation introduced in the colored radiative cooler coordinates the relationship between solar absorption and vivid coloration. We perform the systematic designs in terms of spectrum, thermal analyses, and color coordinates. Finally, experimental demonstrations confirm the theoretical results on the coloration/cooling performance of SSCRC during the daytime.

【 授权许可】

Unknown