Acceptor energy level control of charge photogeneration in organic donor/acceptor blends.
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).
Shoaee
Safa
S
Centre for Plastic Electronics, Department of Chemistry, Imperial College London, London, SW7 2AZ United Kingdom.
Clarke
Tracey M
TM
Huang
Chun
C
Barlow
Stephen
S
Marder
Seth R
SR
Heeney
Martin
M
McCulloch
Iain
I
Durrant
James R
JR
D000042:Absorption; D004579:Electron Transport; D046529:Microscopy, Electron, Transmission; D010569:Perylene / Q000737:chemistry*; D055668:Photochemical Processes; D013816:Thermodynamics; D013876:Thiophenes / Q000737:chemistry*
D013876:Thiophenes; C507295:poly(3-hexylthiophene); D010569:Perylene