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Journal of Photonics for Energy

Charge photogeneration in donor/acceptor organic solar cells
Author(s): Safa Shoaee; Tracey M. Clarke; Mattias P. Eng; Iain McCulloch; James R. Durrant; Chun Huang; Stephen Barlow; Seth R. Marder; Eva Espildora; Juan Luis Delgado; Nazario Martin; Bert J. Campo; Dirk Vanderzande; Martin J. Heeney
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Paper Abstract

We focus upon the role of interfacial energetics and morphology in influencing the separation of CT states into dissociated charge carriers. 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) fullerene electron acceptors. For the PDI 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 phenyl-C61-butyric acid methyl ester(PCBM). Furthermore, we compare the charge recombination dynamics observed in films comprising P3HT blended with three fullerene derivatives: PCBM and two alternative pyrazolinofullerenes. Transient absorption data indicate that replacement of PCBM with either of the pyrazolinofullerene derivatives results in a transition from nongeminate to monomolecular (geminate) recombination dynamics. We show that this transition cannot be explained by a difference in interfacial energetics. However, this transition does correlate with nanomorphology data that indicate that both pyrazolinofullerenes yield a much finer phase segregation with correspondingly smaller domain sizes than observed with PCBM. Our results therefore provide clear evidence of the role of nanomorphology in determining the nature of recombination dynamics in such donor/acceptor blends.

Paper Details

Date Published: 12 March 2012
PDF: 15 pages
J. Photon. Energy 2(1) 021001 doi: 10.1117/1.JPE.2.021001
Published in: Journal of Photonics for Energy Volume 2, Issue 1
Show Author Affiliations
Safa Shoaee, Imperial College London (United Kingdom)
Tracey M. Clarke, Imperial College London (United Kingdom)
Mattias P. Eng, Imperial College London (United Kingdom)
Iain McCulloch, Imperial College London (United Kingdom)
James R. Durrant, Imperial College London (United Kingdom)
Chun Huang, Georgia Institute of Technology (United States)
Stephen Barlow, Georgia Institute of Technology (United States)
Seth R. Marder, Georgia Institute of Technology (United States)
Eva Espildora, Univ. Complutense de Madrid (Spain)
Juan Luis Delgado, Univ. Complutense de Madrid (Spain)
Nazario Martin, Univ. Complutense de Madrid (Spain)
Bert J. Campo, Univ. Hasselt (Belgium)
Dirk Vanderzande, Univ. Hasselt (Belgium)
Martin J. Heeney, Merck Chemicals Ltd. (United Kingdom)

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