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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/11043

Title: Influence of nanoscale phase separation on geminate versus bimolecular recombination in P3HT:fullerene blend films
Authors: Shoaee, Safa
Eng, Mattias P.
Espildora, Eva
Luis Delgado, Juan
Martin, Nazario
Durrant, James R.
Issue Date: 2010
Citation: ENERGY & ENVIRONMENTAL SCIENCE, 3(7). p. 971-976
Abstract: In this paper, we compare the charge recombination dynamics observed in films comprising poly(3-hexylthiophene) 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 bimolecular 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 which 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.
Notes: [Shoaee, Safa; Eng, Mattias P.; Durrant, James R.] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England. [Espildora, Eva; Luis Delgado, Juan; Martin, Nazario] Univ Complutense, Fac Quim, Dept Quim Organ, E-28040 Madrid, Spain. [Luis Delgado, Juan; Martin, Nazario] Fac Ciencias, IMDEA Nanociencia, E-28049 Madrid, Spain. [Campo, Bert; Vanderzande, Dirk] Univ Hasselt, Inst Mat Res, Div Chem, BE-3590 Diepenbeek, Belgium. j.durrant@imperial.ac.uk
URI: http://hdl.handle.net/1942/11043
DOI: 10.1039/c003394d
ISI #: 000279322800012
ISSN: 1754-5692
Category: A1
Type: Journal Contribution
Validation: ecoom, 2011
Appears in Collections: Research publications

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