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A Self-Assembled 2D Thermofunctional Material for Radiative Cooling

AuthorsJaramillo-Fernandez, Juliana ; Whitworth, Guy L.; Pariente González, J. Ángel; Blanco Montes, Álvaro ; Garcia, Pedro D.; López, Cefe ; Sotomayor Torres, C. M.
KeywordsRadiative cooling
Self-assembled single-layer crystals
Thermofunctional materials
Ultra-broadband thermal emitters
Issue Date27-Dec-2019
PublisherJohn Wiley & Sons
CitationSmall 15(52): 1905290 (2019)
Abstract[EN] The regulation of temperature is a major energy-consuming process of humankind. Today, around 15% of the global-energy consumption is dedicated to refrigeration and this figure is predicted to triple by 2050, thus linking global warming and cooling needs in a worrying negative feedback-loop. Here, an inexpensive solution is proposed to this challenge based on a single layer of silica microspheres self-assembled on a soda-lime glass. This 2D crystal acts as a visibly translucent thermal-blackbody for above-ambient radiative cooling and can be used to improve the thermal performance of devices that undergo critical heating during operation. The temperature of a silicon wafer is found to be 14 K lower during daytime when covered with the thermal emitter, reaching an average temperature difference of 19 K when the structure is backed with a silver layer. In comparison, the soda-lime glass reference used in the measurements lowers the temperature of the silicon by just 5 K. The cooling power of this simple radiative cooler under direct sunlight is found to be 350 W m when applied to hot surfaces with relative temperatures of 50 K above the ambient. This is crucial to radiatively cool down devices, i.e., solar cells, where an increase in temperature has drastic effects on performance.
Publisher version (URL)http://dx.doi.org/10.1002/smll.201905290
Appears in Collections:(CIN2) Artículos
(ICMM) Artículos
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