| 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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Bao, Zhenan
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2022Visualization of the distribution of covalently cross-linked hydrogels in CLARITY brain-polymer hybrids for different monomer concentrations.citations
- 2021Conducting Polymer‐Based Granular Hydrogels for Injectable 3D Cell Scaffolds
- 2020Understanding the Origin of Highly Selective CO2 Electroreduction to CO on Ni, N-doped Carbon Catalysts.citations
- 2020Air-Stability and Carrier Type in Conductive M3(Hexaaminobenzene)2, (M = Co, Ni, Cu).citations
- 2019Fine-Tuning Semiconducting Polymer Self-Aggregation and Crystallinity Enables Optimal Morphology and High-Performance Printed All-Polymer Solar Cells.citations
- 2018Effect of Nonconjugated Spacers on Mechanical Properties of Semiconducting Polymers for Stretchable Transistorscitations
- 2016Direct Uniaxial Alignment of a Donor-Acceptor Semiconducting Polymer Using Single-Step Solution Shearing.citations
- 2015Structural and Electrical Investigation of C 60 –Graphene Vertical Heterostructurescitations
- 2015Ultrahigh electrical conductivity in solution-sheared polymeric transparent films.citations
- 2015Large-area formation of self-aligned crystalline domains of organic semiconductors on transistor channels using CONNECTcitations
- 2015Impact of the Crystallite Orientation Distribution on Exciton Transport in Donor-Acceptor Conjugated Polymerscitations
- 2014One-dimensional self-confinement promotes polymorph selection in large-area organic semiconductor thin filmscitations
- 2014Ultrafast energy transfer from rigid, branched side-chains into a conjugated, alternating copolymercitations
- 2012Controlled Conjugated Backbone Twisting for an Increased Open-Circuit Voltage while Having a High Short-Circuit Current in Poly(hexylthiophene) Derivativescitations
- 2012Chemical and Engineering Approaches To Enable Organic Field-Effect Transistors for Electronic Skin Applicationscitations
- 2011Tuning charge transport in solution-sheared organic semiconductors using lattice straincitations
- 2010Highly sensitive flexible pressure sensors with microstructured rubber dielectric layerscitations
- 2009Self-Sorted Nanotube Networks on Polymer Dielectrics for Low-Voltage Thin-Film Transistorscitations
- 2009High-Performance Air-Stable n-Channel Organic Thin Film Transistors Based on Halogenated Perylene Bisimide Semiconductorscitations
- 2009Crystalline Ultrasmooth Self-Assembled Monolayers of Alkylsilanes for Organic Field-Effect Transistorscitations
Places of action
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article
Direct Uniaxial Alignment of a Donor-Acceptor Semiconducting Polymer Using Single-Step Solution Shearing.
Abstract
The alignment of organic semiconductors (OSCs) in the active layers of electronic devices can confer desirable properties, such as enhanced charge transport properties due to better ordering, charge transport anisotropy for reduced device cross-talk, and polarized light emission or absorption. The solution-based deposition of highly aligned small molecule OSCs has been widely demonstrated, but the alignment of polymeric OSCs in thin films deposited directly from solution has typically required surface templating or complex pre- or postdeposition processing. Therefore, single-step solution processing and the charge transport enhancement afforded by alignment continue to be attractive. We report here the use of solution shearing to tune the degree of alignment in poly(diketopyrrolopyrrole-terthiophene) thin films by controlling the coating speed. A maximum dichroic ratio of ∼7 was achieved on unpatterned substrates without any additional pre- or postdeposition processing. The degree of polymer alignment was found to be a competition between the shear alignment of polymer chains in solution and the complex thin film drying process. Contrary to previous reports, no charge transport anisotropy was observed because of the small crystallite size relative to the channel length, a meshlike morphology, and the likelihood of increased grain boundaries in the direction transverse to coating. In fact, the lack of aligned morphological structures, coupled with observed anisotropy in X-ray diffraction data, suggests the alignment of polymer molecules in both the crystalline and the amorphous regions of the films. The shear speed at which maximum dichroism is achieved can be controlled by altering deposition parameters such as temperature and substrate treatment. Modest changes in molecular weight showed negligible effects on alignment, while longer polymer alkyl side chains were found to reduce the degree of alignment. This work demonstrates that solution shearing can be used to tune polymer alignment in a one-step deposition process not requiring substrate patterning or any postdeposition treatment.