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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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Gunasekar, Kumarasamy
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (5/5 displayed)
- 2018Impact of Topology of Alkoxy Side Chain in Alkoxyphenylthiophene Subsituted Benzodithiophene Based 2D Conjugated Low Bandgap Polymers on Photophysical and Photovoltaic Propertiescitations
- 2017Triazine-based Polyelectrolyte as an Efficient Cathode Interfacial Material for Polymer Solar Cellscitations
- 2017The Impact of Sequential Fluorination of Pi-Conjugated Polymers on Charge Generation in All-Polymer Solar Cellscitations
- 2016Alkoxyphenyl-thiophene, -selenophene and -furan substituted benzodithiophene based 2D pi-conjugated polymers for polymer solar cells and effect of chalcogen on optoelectronic propertiescitations
- 2014New alkylselenyl substituted benzodithiophene-based solution-processable 2D pi-conjugated polymers for bulk heterojunction polymer solar cell applicationscitations
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article
The Impact of Sequential Fluorination of Pi-Conjugated Polymers on Charge Generation in All-Polymer Solar Cells
Abstract
<p>The performance of all-polymer solar cells (all-PSCs) is often limited by the poor exciton dissociation process. Here, the design of a series of polymer donors (P1–P3) with different numbers of fluorine atoms on their backbone is presented and the influence of fluorination on charge generation in all-PSCs is investigated. Sequential fluorination of the polymer backbones increases the dipole moment difference between the ground and excited states (Δµ<sub>ge</sub>) from P1 (18.40 D) to P2 (25.11 D) and to P3 (28.47 D). The large Δµ<sub>ge</sub> of P3 leads to efficient exciton dissociation with greatly suppressed charge recombination in P3-based all-PSCs. Additionally, the fluorination lowers the highest occupied molecular orbital energy level of P3 and P2, leading to higher open-circuit voltage (V<sub>OC</sub>). The power conversion efficiency of the P3-based all-PSCs (6.42%) outperforms those of the P2 and P1 (5.00% and 2.65%)-based devices. The reduced charge recombination and the enhanced polymer exciton lifetime in P3-based all-PSCs are confirmed by the measurements of light-intensity dependent short-circuit current density (J<sub>SC</sub>) and V<sub>OC</sub>, and time-resolved photoluminescence. The results provide reciprocal understanding of the charge generation process associated with Δµ<sub>ge</sub> in all-PSCs and suggest an effective strategy for designing π-conjugated polymers for high performance all-PSCs.</p>