| People | Locations | Statistics |
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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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Nielsen, Martin Meedom
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (25/25 displayed)
- 2024Characterization of Deformational Isomerization Potential and Interconversion Dynamics with Ultrafast X-ray Solution Scattering.citations
- 2024Characterization of Deformational Isomerization Potential and Interconversion Dynamics with Ultrafast X-ray Solution Scatteringcitations
- 2020Hot branching dynamics in a light‐harvesting iron carbene complex revealed by ultrafast x‐ray emission spectroscopycitations
- 2020Hot branching dynamics in a light‐harvesting iron carbene complex revealed by ultrafast x‐ray emission spectroscopycitations
- 2020Vibrational wavepacket dynamics in Fe carbene photosensitizer determined with femtosecond X-ray emission and scatteringcitations
- 2019Simulation of ultrafast excited-state dynamics and elastic x-ray scattering by quantum wavepacket dynamicscitations
- 2017Ligand manipulation of charge transfer excited state relaxation and spin crossover in [Fe(2,2′-bipyridine) 2 (CN) 2 ]citations
- 2017Unique Crystal Orientation of Poly(ethylene oxide) Thin Films by Crystallization Using a Thermal Gradientcitations
- 2016Novel micro-reactor flow cell for investigation of model catalysts using in situ grazing-incidence X-ray scatteringcitations
- 2016The negative piezoelectric effect of the ferroelectric polymer poly(vinylidene fluoride)citations
- 2016The negative piezoelectric effect of the ferroelectric polymer poly(vinylidene fluoride)citations
- 2008Organic thin film transistors with polymer brush gate dielectrics synthesized by atom transfer radical polymerizationcitations
- 2007Nanoscale structural characterization of Mg(NH 3 ) 6 Cl 2 during NH 3 desorption:An in situ small angle X-ray scattering studycitations
- 2007Nanoscale structural characterization of Mg(NH3)6Cl2 during NH3 desorptioncitations
- 2006Enhancement of charge-transport characteristics in polymeric films using polymer brushescitations
- 2006Molecular-weight dependence of interchain polaron delocalization and exciton bandwidth in high-mobility conjugated polymerscitations
- 2006Designing solution-processable air-stable liquid crystalline crosslinkable semiconductorscitations
- 2006Activation of a Cu/ZnO catalyst for methanol synthesiscitations
- 2005Structure of zone-cast HBC-C 1 2 H 2 5 filmscitations
- 2005Effects of packing structure on the optoelectronic and charge transport properties in poly(9,9-di-n-octylfluorene-alt-benzothiadiazole)citations
- 2005Effects of Packing Structure on the Optoelectronic and Charge Transport Properties in Poly(9,9-di- n -octylfluorene- alt -benzothiadiazole)citations
- 2005Structure of zone-cast HBC-C12H25 filmscitations
- 2004Electronic Conductivity of Polypyrrole−Dodecyl Benzene Sulfonate Complexescitations
- 2003Induced alignment of a solution-cast discotic hexabenzocoronene derivative for electronic devices investigated by surface X-ray diffractioncitations
- 2000Micro-structure-mobility correlation in self-organised, conjugated polymer field-effect transistorscitations
Places of action
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article
Effects of packing structure on the optoelectronic and charge transport properties in poly(9,9-di-n-octylfluorene-alt-benzothiadiazole)
Abstract
Spin-coated poly(9,9-di-n-octylfluorene-alt-benzothiadiazole) (F8BT) films of different molecular weights (M-n = 9-255 kg/mol), both in the pristine and annealed state, were studied in an effort to elucidate changes in the polymer packing structure and the effects this structure has on the optoelectronic and charge transport properties of these films. A model based on quantum chemical calculations, wide-angle X-ray scattering, atomic force microscopy, Raman spectroscopy, photoluminescence, and electron mobility measurements was developed to describe the restructuring of the polymer film as a function of polymer chain length and annealing. In pristine high molecular weight films, the polymer chains exhibit a significant torsion angle between the F8 and BT units, and the BT units in neighboring chains are close to one another. Annealing films to sufficiently high transition temperatures allows the polymers to adopt a lower energy configuration in which the BT units in one polymer chain are adjacent to F8 units in a neighboring chain ("alternating structure"), and the torsion angle between F8 and BT units is reduced. This restructuring, dictated by the strong dipole on the BT unit, subsequently affects the efficiencies of interchain electron transfer and exciton migration. Films exhibiting the alternating structure show significantly lower electron mobilities than those of the pristine high molecular weight films, due to a decrease in the efficiency of interchain electron transport in this structure. In addition, interchain exciton migration to low energy weakly emissive states is also reduced for these alternating structure films, as observed in their photoluminescence spectra and efficiencies.