Single transparent silicon polymer processed, using laser, into either radiative cooling or solar heating material, without requiring electricity

https://www.eurekalert.org/news-releases/1101723

"applying this material to building roofs improves efficiency, reducing annual heating/ cooling energy costs by up to 26.5%... controlling laser's output intensity changes material's optical/ thermal properties: high-power laser transforms surface into white porous structure (SiO2-centered) reflecting sunlight lowering temperature 5.89°C, low-power laser creates black porous structure (SiC-centered) absorbing sunlight heating surface to 58.1°C... also, temperature differences enable thermoelectric generators"