Alam, Asiful ; Flavel, Benjamin S. ; Dehm, Simone ; Lemmer, Uli ; Krupke, Ralph (2014):
Photocurrent imaging of semiconducting carbon nanotube devices with local mirrors.
In: physica status solidi (b), 251 (12), pp. 2471-2474. WILEY-VCH Verlag GmbH & Co. KGaA, ISSN 03701972,
[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 ; Flavel, Benjamin S. ; Dehm, Simone ; Lemmer, Uli ; 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 of the journal: | 251 |
| Issue 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 |
| URL / URN: | http://dx.doi.org/10.1002/pssb.201451272 |
| Identification Number: | doi:10.1002/pssb.201451272 |
| PPN: | |
| 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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