Ultra‐Efficient Passive Daytime Radiative Cooling Enabled by Dual‐Selective Inorganic SiO 2 /Si 3 N 4 Photonic Emitter

作者：Lulu Cheng, Houhong Chen, Qiyu Cai, Jiajie Deng, Hao Cheng, Xicheng Fan, Fei Ma, Tianshu Lai, Ke Chen · 发表于：Laser & Photonics Review · 年份：2025 · DOI：10.1002/lpor.202500068 · 被引用次数：20 · 研究领域：Thermal Radiation and Cooling Technologies、Quantum Electrodynamics and Casimir Effect、Optical properties and cooling technologies in crystalline materials

Abstract Radiative cooling is a zero‐energy technology that enables subambient cooling by emitting heat into outer space (≈3K) via the atmospheric transparent windows. However, existing designs predominantly focus only on the primary atmospheric window (8–13 µm) and neglect another window (16–25 µm), underutilizing their cooling potential. Moreover, widely utilized organic radiative cooling metamaterials face significant challenges, including oxidation, degradation, and delamination, which ultimately reduce their operational lifespan. In this work, a dual‐selective emitter is demonstrated based on an inorganic multilayer SiO 2 /Si 3 N 4 photonic structure. Outdoor experiments demonstrate that the emitter achieves notable subambient cooling (≈12.6 °C) and a cooling power of 141.4 under a solar irradiance of over 900, exceeding the performance of existing inorganic multilayer thermal emitters. Moreover, this emitter's substantial application potential is revealed in building cooling energy conservation with estimated annual energy savings of ≈129.1 in hot climates through numerical simulations, thereby facilitating meaningful reductions in fossil fuel consumption and greenhouse gas emissions. This work offers a scalable and practical radiative cooling solution for sustainable thermal management with superior performance.