期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 112, 期 40, 页码 12282-12287出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1509453112
关键词
radiative cooling; thermal radiation; photonic crystal; solar absorber
资金
- Advanced Research Projects Agency-Energy, US Department of Energy [DE-AR0000316]
- National Science Foundation through the National Nanotechnology Infrastructure Network [ECS-9731293]
- Stanford Nano Center and Soft & Hybrid Materials Facility, parts of the Stanford Nano Shared Facilities
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1542152] Funding Source: National Science Foundation
A solar absorber, under the sun, is heated up by sunlight. In many applications, including solar cells and outdoor structures, the absorption of sunlight is intrinsic for either operational or aesthetic considerations, but the resulting heating is undesirable. Because a solar absorber by necessity faces the sky, it also naturally has radiative access to the coldness of the universe. Therefore, in these applications it would be very attractive to directly use the sky as a heat sink while preserving solar absorption properties. Here we experimentally demonstrate a visibly transparent thermal black-body, based on a silica photonic crystal. When placed on a silicon absorber under sunlight, such a blackbody preserves or even slightly enhances sunlight absorption, but reduces the temperature of the underlying silicon absorber by as much as 13 degrees C due to radiative cooling. Our work shows that the concept of radiative cooling can be used in combination with the utilization of sunlight, enabling new technological capabilities.
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