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Femtosecond dynamics of excitons and hole-polarons in composite P3HT/PCBM nanoparticles.
- Source :
-
The journal of physical chemistry. B [J Phys Chem B] 2013 Apr 25; Vol. 117 (16), pp. 4626-33. Date of Electronic Publication: 2013 Feb 19. - Publication Year :
- 2013
-
Abstract
- The dynamics of charge separation in aqueous suspensions of regioregular P3HT nanoparticles containing PCBM were investigated for the first time using femtosecond transient absorption spectroscopy. This investigation is supported by the recently reported use of regioregular P3HT/PCBM nanoparticles as charge trapping and storage devices. In this study, the presence of excited-state and charge-separated species, including singlet excitons, polymer polarons and free charges, generated in rr-P3HT/PCBM nanoparticles was identified through visible pump and visible/near-infrared probe femtosecond transient absorption spectroscopy at a range of electron acceptor concentrations. The decrease of the singlet exciton lifetime by charge transfer to PCBM is well described by a one-dimensional diffusion model with a P3HT domain size of approximately 5 nm for 5-50 wt % PCBM. This model also indicates that bimolecular recombination is the dominant charge recombination mechanism at 20 wt % PCBM and above.
Details
- Language :
- English
- ISSN :
- 1520-5207
- Volume :
- 117
- Issue :
- 16
- Database :
- MEDLINE
- Journal :
- The journal of physical chemistry. B
- Publication Type :
- Academic Journal
- Accession number :
- 23383985
- Full Text :
- https://doi.org/10.1021/jp308876z