3M has developed a see-through film that turns ordinary windows into solar panels. It will go on sale next year. The solar film, on display at the Ceatec electronics conference in Japan, is arrayed in narrow, translucent green strips with clear gaps between and then glued to windows in large patches.
A square meter of the film can generate roughly enough electricity to charge an iPhone under peak sunlight, but still allows for high visibility.
The 3M Film is apparently easier to install than existing solar panels and it takes up less room as no additional space is required, and it can also operate under lower sunlight conditions that traditional solar panels.