Talk given by Prof. Jana Zaumseil Applied Physical Chemistry Uni Heidelberg Abstract: The selective dispersion of semiconducting carbon nanotubes (s-SWNT) by wrapping with conjugated polymers has enabled their application in electronic and optoelectronic devices such as field-effect transistors and light-emitting field-effect transistors. Here, we show that the dispersion process can be easily scaled-up while maintaining good photoluminescence yield (~2%) and nanotube length (>1 µm) to obtain concentrated dispersions and ultimately thin (<10 nm) or thick films (>100 nm) of s-SWNT with excellent optical and electrical properties. We demonstrate ambipolar charge transport and near-infrared light-emission in field-effect transistors based on monochiral and mixed networks of s-SWNT and investigate the influence of the nanotube diameter distribution on charge transport within the network depending on the applied gate voltage and thus charge carrier density. Voltage-dependent photoluminescence and electroluminescence spectra provide insight into the charge distribution among the different nanotubes. For very high charge carrier densities (e.g. by electrolyte-gating) we observe red-shifted trion emission in addition to exciton emission. Furthermore, monochiral s-SWNT films are interesting materials for strong light-matter interaction due to their small Stokes shift and large exciton binding energy, which allows us to demonstrate exciton-polariton formation in suitable cavities and emission enhancement in periodic feedback structures.

This event is part of the eventgroup INT Talks

Homepage
https://www.int.kit.edu/events.php

Speaker
Prof. Jana Zaumseil

University of Heidelberg
http://www.pci.uni-heidelberg.de/apc/staff/zaumseil_cv.html

Organizer
Prof. Ralph Krupke
Institut für Nanotechnologie
KIT
Karlsruhe
Mail: ralph krupke ∂does-not-exist.kit edu
https://www.int.kit.edu

Targetgroup
Interested / Everyone