Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: HL Poster I

HL 12.34: Poster

Montag, 1. April 2019, 17:30–20:00, Poster E

Redox and electrochemical doping of nanoscale semiconductors — •Klaus Eckstein, Florian Oberndorfer, and Tobias Hertel — Institute of Physical and Theoretical Chemistry, Am Hubland, Julius-Maximilians-University Würzburg, 97074 Würzburg

We report on recent advances with the spectroscopic characterization of doped semiconducting carbon nanotubes (SWNTs) using photoluminescence- and femtosecond time-resolved spectroscopies as well as IR-VIS absorption spectroscopy [1-2]. Our primary objective is to obtain an understanding of charge-induced modifications of exciton- and trion- photo- physics, that may eventually provide the basis for a quantitative spectroscopic assessment of carrier concentrations in doped nanotubes or other low-dimensional semiconductors.

Our investigations of electrochemically and redox-chemically doped SWNTs suggest that surplus carriers tend to be localized by their interaction with poorly screened counterions in the nanotube environment. These findings have important implications for several aspects related to the performance of doped nanoscale semiconductors in functional materials, specifically when it comes to charge and energy transport properties of these systems.

[1] H. Hartleb, F. Späth, T. Hertel, ACS Nano 9 (2015) 10461.

[2] K.H. Eckstein, H. Hartleb, M.M. Achsnich, F. Schöppler, T. Hertel, ACS Nano 11 (2017) 10401.