Premium
Deposition of semiconducting single‐walled carbon nanotubes using light‐assisted dielectrophoresis
Author(s) -
Li Wenshan,
Pyatkov Feliks,
Dehm Simone,
Flavel Benjamin S.,
Krupke Ralph
Publication year - 2014
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201451280
Subject(s) - carbon nanotube , dielectrophoresis , materials science , polarizability , nanotechnology , nanoscopic scale , exciton , field effect transistor , optoelectronics , transistor , voltage , chemistry , electrical engineering , physics , organic chemistry , quantum mechanics , molecule , microfluidics , engineering
Dielectrophoresis (DEP) is an established method for the integration of solution‐processed single‐walled carbon nanotubes into nanoscale device structures. However, this method is less effective for small‐diameter semiconducting nanotubes and leads to an enrichment of metallic tubes in multi‐tube devices. In this work, we present the first results of a novel light‐assisted DEP technique, which enhances the deposition of (6,5) semiconducting carbon nanotubes. Transistors fabricated with this technique show higher on/off ratios compared to transistors that were fabricated by conventional DEP. We explain this effect by an enhanced polarizability of the irradiated semiconducting nanotubes and discuss spontaneous and field‐driven exciton dissociation as the underlying mechanism. Strategies to further improve the effect are also proposed.