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HL: Fachverband Halbleiterphysik
HL 4: Carbon: Diamond, Nanotubes, and Graphene
HL 4.7: Talk
Monday, March 14, 2011, 12:00–12:15, POT 251
Time-resolved picosecond photocurrents in contacted carbon nanotubes — •Leonhard Prechtel1, Li Song2, Stephan Manus2, Dieter Schuh3, Werner Wegscheider4, Nadine Erhard1, and Alex W. Holleitner1 — 1Walter Schottky Institut and Physik-Department, TU München — 2Fakultät für Physik and Center for NanoScience (CeNS), LMU, München — 3Institut für Experimentelle und Angewandte Physik, Universität Regensburg — 4Laboratorium für Festkörperphysik, ETH Zürich
We introduce coplanar stripline circuits to resolve the ultrafast photocurrent dynamics of freely suspended carbon nanotubes (CNTs) in the time-domain. By applying an on-chip pump-probe laser spectroscopy we demonstrate that CNTs, contacted by metal electrodes, exhibit a picosecond photocurrent response. We find a combination of an optically induced ultrafast displacement current, transport of photo-generated charge-carriers at the Fermi velocity to the electrodes, and interband charge-carrier recombination processes to dominate the ultrafast photocurrent of the CNTs.