I was reading  about this amazing accidental discovery by Rami Louca at the University of Cambridge Nanoscience centre in Wired UK.

Louca grew a spherical “flower”  – a titanium dioxide nanoparticle filament coated in a light- absorbing dye that works like chlorophyll in plants  – floating in solution. The result is maybe the next- generation of solar cells, much cheaper than silicon cells. (Image courtesy of Wired UK)