Solar cell fabrication from single organic molecule leads to lighter, cheaper, and simpler solar panels with close-to-unity charge collection efficiency

https://www.eurekalert.org/news-releases/1100520

"spin-radical organic semiconductor molecule P3TTM has single unpaired electron at its center... unpaired electrons on neighboring molecules encourages alignment alternately up/ down... absorbed photon moves an electron downhill from 1 molecule to identical nearest molecule, creating positive/ negative charges extracted as photocurrent... energy for this (Hubbard U) is electrostatic charging energy for double electron occupancy of molecule that has become negatively charged"