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Title: Charge photogeneration in donor/acceptor organic solar cells
Authors: Shoaee, Safa
Clarke, Tracey M.
Eng, Mattias P.
Huang, Chun
Barlow, Stephen
Espildora, Eva
Luis Delgado, Juan
CAMPO, Bert 
Marder, Seth R.
Heeney, Martin
McCulloch, Iain
Martin, Nazario
Durrant, James R.
Issue Date: 2012
Source: JOURNAL OF PHOTONICS FOR ENERGY, 2 (Special Issue 1), p. Article 021001
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. (C) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.JPE.2.021001]
Notes: [Shoaee, Safa; Clarke, Tracey M.; Eng, Mattias P.; McCulloch, Iain; Durrant, James R.] Univ London Imperial Coll Sci Technol & Med, Ctr Plast Elect, Dept Chem, London SW7 2AZ, England. [Huang, Chun; Barlow, Stephen; Marder, Seth R.] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA. [Huang, Chun; Barlow, Stephen; Marder, Seth R.] Georgia Inst Technol, Ctr Organ Photon & Elect, Atlanta, GA 30332 USA. [Heeney, Martin; McCulloch, Iain] Merck Chem, Southampton SO16 7QD, Hants, England. [Heeney, Martin] Univ London, Dept Mat, Queen Mary EI 4NS, England. [Espildora, Eva; Luis Delgado, Juan; Martin, Nazario] Univ Complutense, Fac Quim, Dept Quim Organ, E-28040 Madrid, Spain. [Luis Delgado, Juan; Martin, Nazario] Ciudad Univ Cantoblanco, IMDEA Nanociencia, Fac Ciencias, E-28049 Madrid, Spain. [Campo, Bert; Vanderzande, Dirk] Inst Mat Res, Div Chem, BE-3590 Diepenbeek, Belgium.
Keywords: Materials Science, Multidisciplinary; Optics; Physics, Applied;charge photogeneration; nanomorphology; energy for charge separation
Document URI:
DOI: 10.1117/1.JPE.2.021001
ISI #: 000309362300001
Category: A1
Type: Journal Contribution
Validations: ecoom 2013
Appears in Collections:Research publications

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