Solar panels can be engineered to also optimize cooling, by selectively increasing their reflectivity at wavelengths that are neither useful for electricity pro

Solar panels can be engineered to also optimize cooling, by selectively increasing their reflectivity at wavelengths that are neither useful for electricity production nor for radiation of their waste thermal energy. https://web.stanford.edu/group/fan/publication/Li_ACSPhotonics_4_774_2017.pdf https://web.stanford.edu/group/fan/publication/Li_ACSPhotoni... "[...] we design a photonic cooler made of one- dimensional photonic films that can strongly radiate heat through its thermal emission while also significantly reflecting the solar spectrum in the sub-band-gap and ultraviolet regimes. We show that applying this photonic cooler to a solar panel can lower the cell temperature by over 5.7 °C."