Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Poster Session IV

CPP 46.41: Poster

Mittwoch, 14. März 2018, 11:00–13:00, Poster A

Charge Localisation and Quantitative Chemical p-Doping in Single-Wall Carbon Nanotubes — •Bernd Sturdza¹, Michael Auth¹, 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 — ³Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg

Single-Wall Carbon Nanotubes (SWNTs) meet the requirements for various applications due to their particular electronic properties. As in other semiconductors the influence of defects and doping is highly important for future technologies. Recent studies indicated charge carrier localisation in AuCl₃ doped (6,5) SWNTs implied by changing exciton dynamics using indirect all-optical measurements [1]. Here we show direct quantitative studies of p-doping in SWNTs employing electron paramagnetic resonance (EPR). By comparison to a spin count reference sample quantitative EPR yields direct access to doping concentrations. We were able to quantify the p-doping concentrations on the SWNTs for various doping ratios, further receiving new insight into 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