title: Direct optical generation of long-range charge-transfer states in organic photovoltaics.
abstract: Direct optical excitation of long-range charge-transfer (CT) states in organic photovoltaics is shown to be feasible, a fact that is ascribed to the very low but non-vanishing oscillator strength of each individual transition and the much higher density of states (DOS) as compared with their short-range counterparts. This finding provides a new framework to interpret the low-energy absorption spectra of photovoltaic devices and to correlate this property with the optoelectronic conversion process in working devices.
authors.affiliation: Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Institute of Theoretical and Computational Chemistry, Nanjing University, Nanjing, 210093, China.
authors.forename: Haibo
authors.initials: H
authors.lastname: Ma
authors.forename: Alessandro
authors.initials: A
authors.lastname: Troisi
keywords: charge separation; exciton dissociation; long-range charge-transfer states; organic solar cells