Selective multilayer emitter for high performance daytime radiative cooling

Sunae So; Younghwan Yang; Junsuk Rho

doi:10.1117/12.2583040

5 March 2021 Selective multilayer emitter for high performance daytime radiative cooling

Sunae So, Younghwan Yang, Junsuk Rho

Proceedings Volume 11681, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices X; 1168113 (2021) https://doi.org/10.1117/12.2583040
Event: SPIE OPTO, 2021, Online Only

Conference Poster

Abstract

Passive radiative cooling has attracted great attention due to its capability to dissipate heat without energy consumption [1,2]. Here, we demonstrate a one dimensional photonic structure for high-performance daytime radiative cooling [3]. Structural parameters of the proposed photonic structure are optimized for both wavelength range of the solar and atmospheric transparency window simultaneously. The types of materials and thicknesses of up-to 10 layers of multilayer are optimized by genetic algorithms. We develop an objective function in the solar region to achieve high-performance daytime radiative cooling with a focus on minimizing solar absorption power. Among the four material candidates of SiO2, Si3N4, MgF2, and HfO2, proper materials are recommended and the best thickness are optimized for desired optical functionalities for daytime radiative cooling. The designed structures minimize the solar power absorbed while strongly emit thermal radiation at the atmospheric transparency window at 8-13 um wavelength region.

Citation Download Citation

Sunae So, Younghwan Yang, and Junsuk Rho "Selective multilayer emitter for high performance daytime radiative cooling", Proc. SPIE 11681, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices X, 1168113 (5 March 2021); https://doi.org/10.1117/12.2583040

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