TRANSPARENT Solar Panels?!

We can maybe back off with the question mark-exclamation point ending on the title, folks.

I'll take 'not 100% transparent' any day of the week if it means that we can turn our windows into solar panels. That would be outstanding.

I am a little curious, though, about just how 'not 100% transparent' they would be. The whole <640 nm thing would be around red/orange, and their explanation that longer wavelengths would travel right on through seems odd. Longer than red/orange doesn't leave a whole lot of colors because the rest of the colors are shorter wavelengths than red/orange.