It may still be a lab experiment, but still, this could led to eventual mainstream adoption of solar power…

Photoelectric current as function of photon energy was measured on single crystal TiO2 coated with a monolayer of PbS nanoparticles. The experiments conclusively showed that multiple electrons were generated and extracted from the nanoparticles for each high energy photon that was absorbed. The result is a theoretical efficiency increase from 31 percent in single junction photovoltaic cells to 47 percent in a MEG cell.

Ars Technica explores how Solar cells could get two electrons for the price of one, efficiency bonus.