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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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Sommer, Michael
Chemnitz University of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2024Meta-kinks are key to binder performance of poly(arylene piperidinium) ionomers for alkaline membrane water electrolysis using non-noble metal catalystscitations
- 2024Molecular-scale imaging enables direct visualization of molecular defects and chain structure of conjugated polymerscitations
- 2022Organogels from Diketopyrrolopyrrole Copolymer Ionene/Polythiophene Blends Exhibit Ground-State Single Electron Transfer in the Solid Statecitations
- 2020Glass transition temperature from the chemical structure of conjugated polymerscitations
- 2019Impact of Side Chains of Conjugated Polymers on Electronic Structure: A Case Studycitations
- 2019Effect of thionation on the performance of PNDIT2-based polymer solar cellscitations
- 2019Impact of side chains of conjugated polymers on electronic structure: a case studycitations
- 2018Tuning the Molecular Weight of the Electron Accepting Polymer in All-Polymer Solar Cellscitations
- 2018Drastic Improvement of Air Stability in an n-Type Doped Naphthalene-Diimide Polymer by Thionationcitations
- 2018Graphene exfoliation in the presence of semiconducting polymers for improved film homogeneity and electrical performancescitations
- 2018In Situ Synthesis of Ternary Block Copolymer/Homopolymer Blends for Organic Photovoltaicscitations
- 2018Impact of Acceptor Fluorination on the Performance of All-Polymer Solar Cellscitations
- 2017Polar Side Chains Enhance Processability, Electrical Conductivity, and Thermal Stability of a Molecularly p-Doped Polythiophenecitations
- 2017Unconventional Molecular Weight Dependence of Charge Transport in the High Mobility n-type Semiconducting Polymer P(NDI2OD-T2)citations
- 2017Signatures of Melting and Recrystallization of a Bulky Substituted Poly(thiophene) Identified by Optical Spectroscopycitations
- 2015High molecular weight mechanochromic spiropyran main chain copolymers via reproducible microwave-assisted Suzuki polycondensationcitations
- 2015High molecular weight mechanochromic Spiropyran main chain copolymers via reproducible microwave-assisted Suzuki polycondensationcitations
- 2013Hierarchical orientation of crystallinity by block-copolymer patterning and alignment in an electric fieldcitations
- 2013Crystallization-induced 10-nm structure formation in P3HT/PCBM blendscitations
- 2012Solvent additive control of morphology and crystallization in semiconducting polymer blendscitations
Places of action
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article
Tuning the Molecular Weight of the Electron Accepting Polymer in All-Polymer Solar Cells
Abstract
<p>Molecular weight is an important factor determining the morphology and performance of all-polymer solar cells. Through the application of direct arylation polycondention, a series of batches of a fluorinated naphthalene diimide-based acceptor polymer are prepared with molecular weight varying from M<sub>n</sub> = 20 to 167 kDa. Used in conjunction with a common low bandgap donor polymer, the effect of acceptor molecular weight on solar cell performance, morphology, charge generation, and transport is explored. Increasing the molecular weight of the acceptor from M<sub>n</sub> = 20 to 87 kDa is found to increase cell efficiency from 2.3% to 5.4% due to improved charge separation and transport. Further increasing the molecular weight to M<sub>n</sub> = 167 kDa however is found to produce a drop in performance to 3% due to liquid–liquid phase separation which produces coarse domains, poor charge generation, and collection. In addition to device studies, a systematic investigation of the microstructure and photophysics of this system is presented using a combination of transmission electron microscopy, grazing-incidence wide-angle X-ray scattering, near-edge X-ray absorption fine-structure spectroscopy, photoluminescence quenching, and transient absorption spectroscopy to provide a comprehensive understanding of the interplay between morphology, photophysics, and photovoltaic performance.</p>