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Photocurrent imaging of semiconducting carbon nanotube devices with local mirrors

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

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.

Item Type: Article
Erschienen: 2014
Creators: Alam, Asiful and Flavel, Benjamin S. and Dehm, Simone and Lemmer, Uli and Krupke, Ralph
Title: Photocurrent imaging of semiconducting carbon nanotube devices with local mirrors
Language: English
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.

Journal or Publication Title: physica status solidi (b)
Volume: 251
Number: 12
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA
Uncontrolled Keywords: carbon nanotubes, photocurrent spectroscopy, supercontinuum scanning microscopy
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Molekulare Nanostrukturen
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Jan 2015 12:08
Official URL: http://dx.doi.org/10.1002/pssb.201451272
Identification Number: doi:10.1002/pssb.201451272
Funders: 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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