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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Parkinson, Patrick
University of Manchester
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2023Heterometallic lanthanide complexes with site-specific binding that enable simultaneous visible and NIR-emissioncitations
- 2021Measuring, controlling and exploiting heterogeneity in optoelectronic nanowirescitations
- 2020Spatially and temporally resolved degradation in antisolvent treated perovskite films
- 2020Spatially and temporally resolved degradation in antisolvent treated perovskite films
- 2019Effect of size on the luminescent efficiency of perovskite nanocrystalscitations
- 2016Characterization of a silica-PVA hybrid for high density and stable silver dissolutioncitations
- 2013III-V semiconductor nanowires for optoelectronic device applicationscitations
- 2012Polarization tunable, multicolor emission from core-shell photonic III-V semiconductor nanowirescitations
- 2011III-V semiconductor nanowires for optoelectronic device applicationscitations
- 2008Efficient generation of charges via below-gap photoexcitation of polymer-fullerene blend films investigated by terahertz spectroscopycitations
- 2007Dimensionality-dependent energy transfer in polymer-intercalated SnS2 nanocompositescitations
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article
Efficient generation of charges via below-gap photoexcitation of polymer-fullerene blend films investigated by terahertz spectroscopy
Abstract
Using optical-pump terahertz-probe spectroscopy, we have investigated the time-resolved conductivity dynamics of photoexcited polymer-fullerene bulk heterojunction blends for two model polymers: poly3-hexylthiophene (P3HT) and poly2-methoxy-5-3,7-dimethyloctyloxy-1,4-phenylenevinylene (MDMO-PPV) blended with 6,6-phenyl-C61 butyric acid methyl ester (PCBM). The observed terahertz frequency conductivity is characteristic of dispersive charge transport for photoexcitation both at the absorption peak 560 nm for P3HT and significantly below it 800 nm. The photoconductivity at 800 nm is unexpectedly high, which we attribute to the presence of a charge-transfer complex. We report the excitation fluence dependence of the photoconductivity over more than four orders of magnitude, obtained by utilizing a terahertz spectrometer based upon on either a laser oscillator or an amplifier source. The time-averaged photoconductivity of the P3HT:PCBM blend is over 20 times larger than that of P3HT, indicating that longlived hole polarons are responsible for the high photovoltaic efficiency of polymer:fullerene blends. At early times the linear dependence of photoconductivity upon fluence indicates that interfacial charge transfer dominates as an exciton decay pathway, generating charges with mobility of at least 0.1 cm2 V−1 s−1. At later times, a sublinear relationship shows that carrier-carrier recombination effects influence the conductivity on a longer time scale with a bimolecular charge annihilation constant for the blends that is approximately two to three orders of magnitude smaller than that typical for neat polymer films.