Apr 25, 2024
9:00am - 9:15am
Room 437, Level 4, Summit
Martijn Kemerink1,Aditya Dash1,Shubhradip Guchait2,Dorothea Scheunemann1,Vishnu Vijayakumar2,Nicolas Leclerc3,Martin Brinkmann2
University of Heidelberg1,Institute Charles Sadron2,Université de Strasbourg3
Martijn Kemerink1,Aditya Dash1,Shubhradip Guchait2,Dorothea Scheunemann1,Vishnu Vijayakumar2,Nicolas Leclerc3,Martin Brinkmann2
University of Heidelberg1,Institute Charles Sadron2,Université de Strasbourg3
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, we show 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, we show that this leads to exceptionally high conductivities at relatively low dopant concentrations.