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Scheunemann, Dorothea
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Topics
Publications (8/8 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
- 2021Sequential doping of solid chunks of a conjugated polymer for body-heat-powered thermoelectric modulescitations
- 2020Rubbing and Drawing: Generic Ways to Improve the Thermoelectric Power Factor of Organic Semiconductors?citations
- 2014Improved efficiency of bulk heterojunction hybrid solar cells by utilizing CdSe quantum dot–graphene nanocompositescitations
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article
Spontaneous Modulation Doping in Semi‐Crystalline Conjugated Polymers Leads to High Conductivity at Low Doping Concentration
Abstract
The possibility to control the charge carrier density through doping is one of the defining properties of semiconductors. For organic semiconductors, the doping process is known to come with several problems associated with the dopant compromising the charge carrier mobility by deteriorating the host morphology and/or introducing Coulomb traps. While for inorganic semiconductors these factors can be mitigated through (top-down) modulation doping, this concept has not been employed in organics. Here, this work shows that properly chosen host/dopant combinations can give rise to spontaneous, bottom-up modulation doping, in which the dopants preferentially sit in an amorphous phase, while the actual charge transport occurs predominantly in a crystalline phase with an unaltered microstructure, spatially separating dopants and mobile charges. Combining experiments and numerical simulations, this work shows that this leads to exceptionally high conductivities at relatively low dopant concentrations.