Scientists at the US department of energy ’s National Renewable Energy Laboratory ( NREL ) have developed a silicon - based solar window that gets darker the sunnier it is and has a thermal efficiency of 11.3 % . The window drives out organic molecules when it is exposed to sunlight , heats the glass , and absorbs them as it breaks back down .
Scientists at the US Department of Energy’s National Renewable Energy Laboratory (NREL) have presented a perovskite-based solar window that gets darker the sunnier it is and has a conversion efficiency of 11.3%. The window drives out methylamine molecules when it is exposed to sunlight, darkening the glass, and absorbs them as it cools back down.