A Multilayer‐Based Visibly Transparent Radiative Cooler with Enhanced Solar Selectivity

Abstract Transparent radiative cooling enables passive thermal management by selectively reflecting solar radiation and emitting thermal energy, thereby offering a promising solution for energy‐efficient cooling in transparent applications. Despite recent progress in the development of transparent radiative coolers, achieving a balance between high visible transparency and effective solar reflection remains a critical challenge in enhancing the cooling performance. In this study, a transparent radiative cooler comprising a 50 µm‐thick polydimethylsiloxane (PDMS) emitter integrated with a sophisticated metal‐dielectric multilayer is evaluated both experimentally and theoretically. The theoretical simulations demonstrate a visible transmittance >82% and a near‐infrared reflectance >92%, with a sharp transition between spectral regimes. Experimental characterizations confirm a visible transmittance of 48% alongside an enhanced near‐infrared reflectance of 98%, thereby validating robust cooling performance under real‐world conditions. Additionally, daytime outdoor measurements indicate that the cooler achieves a maximum temperature reduction of 10.8 °C compared to conventional PDMS‐coated glass. Furthermore, global simulations illustrate the cooling effect of this cooler under diverse climatic conditions, highlighting its potential for use in various terrestrial areas.