title: Acceptor energy level control of charge photogeneration in organic donor/acceptor blends.
abstract: In this paper we focus upon the role of interfacial energetics in influencing the separation of charge transfer states into dissociated charge carriers in organic donor/acceptor blend films. In particular, we undertake transient optical studies of films comprising regioregular poly(3-hexylthiophene) (P3HT) blended with a series of perylene-3,4:9,10-tetracarboxydiimide (PDI) electron acceptors. For this film series, we observe a close correlation between the PDI electron affinity and the efficiency of charge separation. This correlation is discussed in the context of studies of charge photogeneration for other organic donor/acceptor blend films, including other polymers, blend compositions, and the widely used electron acceptor 3'-phenyl-3'H-cyclopropa[1,9](C(60)-I(h))[5,6]fullerene-3'-butanoic acid methyl ester (PCBM).
authors.affiliation: Centre for Plastic Electronics, Department of Chemistry, Imperial College London, London, SW7 2AZ United Kingdom.
authors.forename: Safa
authors.initials: S
authors.lastname: Shoaee
authors.forename: Tracey M
authors.initials: TM
authors.lastname: Clarke
authors.forename: Chun
authors.initials: C
authors.lastname: Huang
authors.forename: Stephen
authors.initials: S
authors.lastname: Barlow
authors.forename: Seth R
authors.initials: SR
authors.lastname: Marder
authors.forename: Martin
authors.initials: M
authors.lastname: Heeney
authors.forename: Iain
authors.initials: I
authors.lastname: McCulloch
authors.forename: James R
authors.initials: JR
authors.lastname: Durrant
mesh_terms: D000042:Absorption; D004579:Electron Transport; D046529:Microscopy, Electron, Transmission; D010569:Perylene / Q000737:chemistry*; D055668:Photochemical Processes; D013816:Thermodynamics; D013876:Thiophenes / Q000737:chemistry*
chemical_list: D013876:Thiophenes; C507295:poly(3-hexylthiophene); D010569:Perylene