The two molecules are chemically linked, and the resulting dimer allows for interesting precision in the conversion of light to electricity, and the method of production that the Brookhaven scientists developed actually enables them to play around with different sized molecules fullerenes and quantum dots both.

FORBES: Quantum Dots and Fullerenes Team Up For Better Nanoscale Solar Panels

Sandwiching the solar cells inside the device would block some light out and knock down power conversion efficiency even further, Filler cautioned.

FORBES: Magazine Article

So it's not the journey that's slowing things down, it's the conversion from electronic signal to light and light back to electronic signal.

CNN: Surfing at the speed of light

Panasonic's artificial photosysnthesis system has a simple structure with highly efficient CO2 conversion, which can utilize direct sunlight or focused light.

ENGADGET: Panasonic Photosynthesis System converts carbon dioxide to organic material with plant-like efficiency