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)
doi: 10.1002/pssb.201451272
Artikel, Bibliographie
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 |
| Art des Eintrags: | Bibliographie |
| Titel: | Photocurrent imaging of semiconducting carbon nanotube devices with local mirrors |
| Sprache: | Englisch |
| Publikationsjahr: | Dezember 2014 |
| Verlag: | WILEY-VCH Verlag GmbH & Co. KGaA |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | physica status solidi (b) |
| Jahrgang/Volume einer Zeitschrift: | 251 |
| (Heft-)Nummer: | 12 |
| DOI: | 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. |
| Freie Schlagworte: | carbon nanotubes, photocurrent spectroscopy, supercontinuum scanning microscopy |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Molekulare Nanostrukturen 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 08 Jan 2015 12:08 |
| Letzte Änderung: | 08 Jan 2015 12:08 |
| PPN: | |
| 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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