| 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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Kemerink, Martijn
Heidelberg University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (31/31 displayed)
- 2024Electrically Programmed Doping Gradients Optimize the Thermoelectric Power Factor of a Conjugated Polymercitations
- 2024Electrically Programmed Doping Gradients Optimize the Thermoelectric Power Factor of a Conjugated Polymercitations
- 2023Spontaneous Modulation Doping in Semi‐Crystalline Conjugated Polymers Leads to High Conductivity at Low Doping Concentrationcitations
- 2022On the Origin of Seebeck Coefficient Inversion in Highly Doped Conducting Polymerscitations
- 2022Charge transport in doped conjugated polymers for organic thermoelectricscitations
- 2020Rubbing and Drawing: Generic Ways to Improve the Thermoelectric Power Factor of Organic Semiconductors?citations
- 2019Suppressing depolarization by tail substitution in an organic supramolecular ferroelectriccitations
- 2019Photogenerated Charge Transport in Organic Electronic Materials: Experiments Confirmed by Simulationscitations
- 2019Pulsed Terahertz Emission from Solution-Processed Lead Iodide Perovskite Filmscitations
- 2019Enhanced Thermoelectric Power Factor of Tensile Drawn Poly(3-hexylthiophene)citations
- 2019Impact of Singly Occupied Molecular Orbital energy on the n-doping efficiency of benzimidazole-derivativescitations
- 2018Dead Ends Limit Charge Carrier Extraction from All-Polymer Bulk Heterojunction Solar Cellscitations
- 2017Enhanced Electrical Conductivity of Molecularly p-Doped Poly(3-hexylthiophene) through Understanding the Correlation with Solid-State Ordercitations
- 2017Enhanced Electrical Conductivity of Molecularly p-Doped Poly(3-hexylthiophene) through Understanding the Correlation with Solid-State Order.citations
- 2016Data retention in organic ferroelectric resistive switchescitations
- 2016Data retention in organic ferroelectric resistive switchescitations
- 2015Modeling Anomalous Hysteresis in Perovskite Solar Cellscitations
- 2015Surface Directed Phase Separation of Semiconductor Ferroelectric Polymer Blends and their Use in Non-Volatile Memoriescitations
- 2015Surface directed phase separation of semiconductor ferroelectric polymer blends and their use in non-volatile memoriescitations
- 2015Microstructured organic ferroelectric thin film capacitors by solution micromoldingcitations
- 2014Photoluminescence quenching in films of conjugated polymers by electrochemical dopingcitations
- 2014Photoluminescence quenching in films of conjugated polymers by electrochemical dopingcitations
- 2012Unusual thermoelectric behavior indicating a hopping to band-like transport transition in pentacenecitations
- 2012Dynamic processes in sandwich polymer light-emitting electrochemical cellscitations
- 2012Charge transport in amorphous InGaZnO thin film transistorscitations
- 2011Salt concentration effects in planar light-emitting electrochemical cellscitations
- 2011Description of the morphology dependent charge transport and performance of polymer: fullerene bulk heterojunction solar cellscitations
- 2010A unifying model for the operation of light-emitting electrochemical cellscitations
- 2009Scanning kelvin probe microscopy on bulk heterojunction polymer blendscitations
- 2004Scanning tunneling spectroscopy on organic semiconductors : experiment and modelcitations
- 2003Scanning-tunneling spectroscopy on conjugated polymer films
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article
Electrically Programmed Doping Gradients Optimize the Thermoelectric Power Factor of a Conjugated Polymer
Abstract
<jats:title>Abstract</jats:title><jats:p>Functionally graded materials (FGMs) are widely explored in the context of inorganic thermoelectrics, but not yet in organic thermoelectrics. Here, the impact of doping gradients on the thermoelectric properties of a chemically doped conjugated polymer is studied. The in‐plane drift of counterions in moderate electric fields is used to create lateral doping gradients in films composed of a polythiophene with oligoether side chains, doped with 2,3,5,6‐tetrafluoro‐tetracyanoquinodimethane (F<jats:sub>4</jats:sub>TCNQ). Raman microscopy reveals that a bias voltage of as little as 5 V across a 50 µm wide channel is sufficient to trigger counterion drift, resulting in doping gradients. The effective electrical conductivity of the graded channel decreases with bias voltage, while an overall increase in Seebeck coefficient is observed, yielding an up to eight‐fold enhancement in power factor. Kinetic Monte Carlo simulations of graded films explain the increase in power factor in terms of a roll‐off of the Seebeck coefficient at high electrical conductivities in combination with a mobility decay due to increased Coulomb scattering at high dopant concentrations. Therefore, the FGM concept is found to be a way to improve the thermoelectric performance of not yet optimally doped organic semiconductors, which may ease the screening of new materials as well as the fabrication of devices.</jats:p>