Passive radiative cooler for solar cells' temperature and efficiency control - Perrakis, George; Tasolamprou, Anna C.; Kenanakis, George; Economou, Eleftherios N.; Tzortzakis, Stelios; Kafesaki, Maria (2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021, 2021)