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Photocurrent spectroscopy of dye-sensitized carbon nanotubes

Alam, Asiful and Dehm, Simone and Hennrich, Frank and Zakharko, Yuriy and Graf, Arko and Pfohl, Moritz and Hossain, Ihteaz M. and Kappes, Manfred M. and Zaumseil, Jana and Krupke, Ralph and Flavel, Benjamin S. (2017):
Photocurrent spectroscopy of dye-sensitized carbon nanotubes.
In: Nanoscale, 9 (31), pp. 11205-11213, ISSN 2040-3364,
DOI: 10.1039/C7NR04022A,
[Online-Edition: https://doi.org/10.1039/C7NR04022A],
[Article]

Abstract

Monochiral (7,5) single walled carbon nanotubes (SWCNTs) are integrated into a field effect transistor device in which the built-in electric field at the nanotube/metal contact allows for exciton separation under illumination. Variable wavelength spectroscopy and 2D surface mapping of devices consisting of 10–20 nanotubes are performed in the visible region and a strong correlation between the nanotube's second optical transition (S_22) and the photocurrent is found. After integration, the SWCNTs are non-covalently modified with three different fluorescent dye molecules with off-resonant absorption maxima at 532 nm, 565 nm, and 610 nm. The dyes extend the absorption properties of the nanotube and contribute to the photocurrent. This approach holds promise for the development of photo-detectors and for applications in photovoltaics and biosensing.

Item Type: Article
Erschienen: 2017
Creators: Alam, Asiful and Dehm, Simone and Hennrich, Frank and Zakharko, Yuriy and Graf, Arko and Pfohl, Moritz and Hossain, Ihteaz M. and Kappes, Manfred M. and Zaumseil, Jana and Krupke, Ralph and Flavel, Benjamin S.
Title: Photocurrent spectroscopy of dye-sensitized carbon nanotubes
Language: English
Abstract:

Monochiral (7,5) single walled carbon nanotubes (SWCNTs) are integrated into a field effect transistor device in which the built-in electric field at the nanotube/metal contact allows for exciton separation under illumination. Variable wavelength spectroscopy and 2D surface mapping of devices consisting of 10–20 nanotubes are performed in the visible region and a strong correlation between the nanotube's second optical transition (S_22) and the photocurrent is found. After integration, the SWCNTs are non-covalently modified with three different fluorescent dye molecules with off-resonant absorption maxima at 532 nm, 565 nm, and 610 nm. The dyes extend the absorption properties of the nanotube and contribute to the photocurrent. This approach holds promise for the development of photo-detectors and for applications in photovoltaics and biosensing.

Journal or Publication Title: Nanoscale
Volume: 9
Number: 31
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: 12 Feb 2018 13:00
DOI: 10.1039/C7NR04022A
Official URL: https://doi.org/10.1039/C7NR04022A
Funders: BSF gratefully acknowledges support from the Deutsche Forschungsgemeinschaft (DFG) under grant numbers FL 834/ 1-1 and FL 834/2-1. RK acknowledges funding by the DFG under INST 163/354-1 FUGG. YZ, AG and JZ acknowledge financial support by European, Research Council under the European Union ’ s Seventh Framework Programme (FP/2007- 2013)/ERC Grant Agreement No. 306298. RK, FH and MK acknowledge support by the Helmholtz Association through program STN. We would also like to acknowledge Bernd Ebenhoch, and Dr Alexander Colsmann for their assist in PESA measurements.
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