Abstract
Ambipolar transport in PCBM: The methanofullerene PCBM is an electron acceptor and a key component of polymer solar cells. Time-of-flight mobility measurements show that PCBM dramatically increases the hole mobility of a poly(phenylene vinylene) polymer/ PCBM blend, and that PCBM transports electrons and holes equally well. This may explain the high PCBM content required for efficient solar cells.