Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 77: Organic Electronics and Photovoltaics - Transport and Doping

CPP 77.8: Talk

Friday, March 16, 2018, 11:45–12:00, C 243

Quantitative Molecular Doping and Electron Trapping in Single-Wall Carbon Nanotubes — •Michael Auth¹, Bernd Sturdza¹, Klaus H. Eckstein², Florian Oberndorfer², Andreas Sperlich¹, Tobias Hertel², and Vladimir Dyakonov^1,3 — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²Institute of Physical and Theoretical Chemistry, Julius Maximilian University of Würzburg, 97074 Würzburg — ³Bayerisches Zentrum für Angewandte Energieforschung (ZAE Bayern), 97074 Würzburg

Defects and doping in Single-Wall Carbon Nanotubes (SWNTs) by (electro-) chemical methods is a highly important topic for future applications of SWNTs. Previous indirect all-optical techniques hypothesise charge carrier localisation in SWNTs due to adjacent AuCl₃ molecules, which is indicated by changing exciton dynamics ¹. Here, we present direct quantitative investigations of chemical p-doping by means of electron paramagnetic resonance (EPR), using a spin count reference sample. We estimated the p-doping concentrations on our SWNTs over a wide range, gaining new insight into the widely discussed topic of charge carrier confinement.

1. Eckstein et. al., Localized Charges Control Exciton Energetics and Energy-Dissipation in Doped Carbon Nanotubes, ACS Nano 2017, DOI:10.1021/acsnano.7b05543