Time-resolved picosecond photocurrents in contacted carbon nanotubes.
basic_science · Level V
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- Record sourced from PubMed, PMID 21142051.
- Also identified by DOI 10.1021/nl1036897.
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Abstract
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 photogenerated charge carriers at the Fermi velocity to the electrodes, and interband charge-carrier recombination processes to dominate the ultrafast photocurrent of the CNTs.