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Photocurrent imaging of semiconducting carbon nanotube devices with local mirrors

Alam, Asiful ; Flavel, Benjamin S. ; Dehm, Simone ; Lemmer, Uli ; Krupke, Ralph :
Photocurrent imaging of semiconducting carbon nanotube devices with local mirrors.
[Online-Edition: http://dx.doi.org/10.1002/pssb.201451272]
In: physica status solidi (b), 251 (12) pp. 2471-2474. ISSN 03701972
[Artikel], (2014)

Offizielle URL: http://dx.doi.org/10.1002/pssb.201451272

Kurzbeschreibung (Abstract)

Photocurrent spectroscopy has recently been used by several research groups to study the light–matter interaction in carbon nanotubes. To achieve this, long-channel devices with symmetric metallic contacts are typically used, where photocurrent of opposite sign is generated at the two contacts. However, in short-channel devices (<1 µm) the diffraction-limited laser spot results in simultaneous excitation of both metal–nanotube contacts and leads to partial cancellation of the photocurrent. In this work, we avoid simultaneous excitation of both metal–nanotube contacts by fabricating an isolated metallic mirror over one of the contacts. With the use of (6,5) carbon nanotubes we demonstrate a unipolar photocurrent signal, that is consistent with the second order interband absorption of a (6,5) nanotube.

Typ des Eintrags: Artikel
Erschienen: 2014
Autor(en): Alam, Asiful ; Flavel, Benjamin S. ; Dehm, Simone ; Lemmer, Uli ; Krupke, Ralph
Titel: Photocurrent imaging of semiconducting carbon nanotube devices with local mirrors
Sprache: Englisch
Kurzbeschreibung (Abstract):

Photocurrent spectroscopy has recently been used by several research groups to study the light–matter interaction in carbon nanotubes. To achieve this, long-channel devices with symmetric metallic contacts are typically used, where photocurrent of opposite sign is generated at the two contacts. However, in short-channel devices (<1 µm) the diffraction-limited laser spot results in simultaneous excitation of both metal–nanotube contacts and leads to partial cancellation of the photocurrent. In this work, we avoid simultaneous excitation of both metal–nanotube contacts by fabricating an isolated metallic mirror over one of the contacts. With the use of (6,5) carbon nanotubes we demonstrate a unipolar photocurrent signal, that is consistent with the second order interband absorption of a (6,5) nanotube.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: physica status solidi (b)
Band: 251
(Heft-)Nummer: 12
Verlag: WILEY-VCH Verlag GmbH & Co. KGaA
Freie Schlagworte: carbon nanotubes, photocurrent spectroscopy, supercontinuum scanning microscopy
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Molekulare Nanostrukturen
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 08 Jan 2015 12:08
Offizielle URL: http://dx.doi.org/10.1002/pssb.201451272
ID-Nummer: 10.1002/pssb.201451272
Sponsoren: Funded by Deutsche Forschungsgemeinschaft's Emmy Noether Program. Grant Number: FL834/1-1, Funded by Deutsche Forschungsgemeinschaft. Grant Number: INTST 163/354-1 FUGG
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