Until now, solar cells of this kind have been only partially transparent and usually a bit tinted, but these new ones are so clear that they're practically indistinguishable from a normal pane of glass.

Previous claims toward transparent solar panels have been misleading, since the very nature of transparent materials means that light must pass through them. Transparent photovoltaic cells are virtually impossible, in fact, because solar panels generate energy by converting absorbed photons into electrons. For a material to be fully transparent, light would have to travel uninhibited to the eye which means those photons would have to pass through the material completely (without being absorbed to generate solar power).