title: Nanosecond intersystem crossing times in fullerene acceptors: implications for organic photovoltaic diodes.
abstract: Triplet-exciton formation through intersystem crossing of photogenerated singlet excitons in fullerene acceptors can compete with charge generation in organic photovoltaic diodes. This article reports the intersystem crossing timescale (τISC ) of the most commonly used fullerene acceptors, PC60 BM and PC70 BM, in solutions and in spin-coated films. These times are on the nanosecond timescale, and are longer than the characteristic times for charge generation (τd ).
authors.affiliation: Cavendish Laboratory, University of Cambridge, CB3 0HE, United Kingdom.
authors.forename: Philip C Y
authors.initials: PC
authors.lastname: Chow
authors.forename: Sebastian
authors.initials: S
authors.lastname: Albert-Seifried
authors.forename: Simon
authors.initials: S
authors.lastname: Gélinas
authors.forename: Richard H
authors.initials: RH
authors.lastname: Friend
keywords: electronic processes; fullerenes; organic electronics; photovoltaic devices; solar cells