Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 3, Issue 7, Pages 971-976Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c003394d
Keywords
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Funding
- EPSRC
- BP Solar
- Knut and Alice Wallenberg foundation
- European Science Foundation [05-SONS-FP-021 SOHYD]
- MEC of Spain [CT2008-00795/BQU, 2010C-07-25200]
- Comunidad de Madrid [P-PPQ-000225-0505]
- MICINN
- EU
- Institute for the Promotion of Innovation through Science and Technology in Flanders (IWT-Vlaanderen)
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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.
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