Fig. 1. Numbers of SCI articles published every year on radiative cooling（Data Source：https：//www.webofscience.com/wos/alldb/basic-search）

Fig. 2. The spectral emissivity of two ideal radiative coolers：broadband cooler（red line）and selective cooler（blue line）（the left rainbow background spectrum shows solar irradiance and the right blue background spectrum shows the " atmospheric window"）^［55］

Fig. 3. The schematic diagram of heat exchanges of a radiative cooling structure

Fig. 4. Performance of radiative cooling materials developed by Zhai et al.（a）real time ambient temperature and sample surface temperature，（b）real time radiative cooling power ^［79］

Fig. 5. （a）The schematic diagram of preparing PMMA HPA film，（b-c）Scanning micrograph of SiO₂ array template，（d-g）SEM micrograph and elemental distribution diagram of PMMA/SiO₂ composite，（h-i）SEM micrographs of PMMA HPA film^［52］

Fig. 6. （a）Processing diagram of preparing porous P（VDF HFP）HP，（b）SEM picture of P（VDF HFP）HP coating（c）photo of outdoor use of P（VDF HFP）HP coating material^［82］

Fig. 7. Comparative cooling test of metafabric and cotton on human body，（a）photo of cooling test on human body，（b）infrared images of human body for comparative cooling test on cotton（on the left）and metafabric（on the right），respectively^［84］

Fig. 8. Radiative cooling material with multilayer structure^［50］

Fig. 9. Radiative cooler with structured surface of SiO₂（a）and its emissivity spectra（b）^［95］

Fig. 10. Broadband absorption enabled by changing dielectric materials and horizontal superposition ^{［96，97］}

Fig. 11. Broadband absorption enabled by vertical superposition of tapering structures^{［46，70］}

Fig. 12. Broadband absorption enabled by changing dielectric layer thickness ^［100］

Fig. 13. Structure of a pyramid silica radiative cooler（a）and its cooling effect on solar cells（b）^［149］

Fig. 14. Radiative cooling system built by Fan’s group，（a）the schematic diagram，（b，c，d）experimental setup ^［153］