Scalable colored sub-ambient radiative coolers based on a polymer-Tamm photonic structure
Abstract
Daytime radiative coolers cool objects below the air temperature without any electricity input, while most of them are limited by a silvery or whitish appearance. Colored daytime radiative coolers (CDRCs) with diverse colors, scalable manufacture, and sub-ambient cooling have not been achieved. We introduce a polymer-Tamm photonic structure to enable a high infrared emittance and an engineered absorbed solar irradiance, governed by the quality factor (Q-factor). We theoretically determine the theoretical thresholds for sub-ambient cooling through yellow, magenta, and cyan CDRCs. We experimentally fabricate and observe a temperature drop of 2.6-8.8 degrees Celsius on average during daytime and 4.0-4.4degrees Celsius during nighttime. Furthermore, we demonstrate a scalable-manufactured magenta CDRC with a width of 60 cm and a length of 500 cm by a roll-to-roll deposition technique. This work provides guidelines for large-scale CDRCs and offers unprecedented opportunities for potential applications with energy-saving, aesthetic, and visual comfort demands.
Keywords
Cite
@article{arxiv.2207.10957,
title = {Scalable colored sub-ambient radiative coolers based on a polymer-Tamm photonic structure},
author = {Tianzhe Huang and Qixiang Chen and Jinhua Huang and Yuehui Lu and Hua Xu and Meng Zhao and Yao Xu and Weijie Song},
journal= {arXiv preprint arXiv:2207.10957},
year = {2026}
}