Spatially resolved electrostatic potential and photocurrent generation in carbon nanotube array devices

Michael Engel, Mathias Steiner, Ravi S. Sundaram, Ralph Krupke, Alexander A. Green, Mark C Hersam, Phaedon Avouris

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We have used laser-excited photocurrent microscopy to map the internal electrostatic potential profile of semiconducting single-walled carbon nanotube (S-SWCNT) array devices with a spatial resolution of 250 nm. The measurements of S-SWCNTs on optically transparent samples provide new insights into the physical principles of device operation and reveal performance-limiting local heterogeneities in the electrostatic potential profile not observable with other imaging techniques. The experiments deliver photocurrent images from the underside of the S-SWCNT-metal contacts and thus enable the direct measurement of the charge carrier transfer lengths at the palladium-S-SWCNT and aluminum-S-SWCNT interfaces. We use the experimental results to formulate design rules for optimized layouts of S-SWCNT-based photovoltaic devices. Furthermore, we demonstrate the external control of the electrostatic potential profile in S-SWCNT array devices equipped with local metal gates.

Original languageEnglish
Pages (from-to)7303-7310
Number of pages8
JournalACS Nano
Volume6
Issue number8
DOIs
Publication statusPublished - Aug 28 2012

Fingerprint

Carbon Nanotubes
Single-walled carbon nanotubes (SWCN)
Photocurrents
photocurrents
Electrostatics
Carbon nanotubes
carbon nanotubes
electrostatics
profiles
Metals
Palladium
Aluminum
Charge carriers
imaging techniques
layouts
metals
palladium
charge carriers
electric contacts
Microscopic examination

Keywords

  • nano-optics
  • nanoelectronics
  • self-assembly

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Engel, M., Steiner, M., Sundaram, R. S., Krupke, R., Green, A. A., Hersam, M. C., & Avouris, P. (2012). Spatially resolved electrostatic potential and photocurrent generation in carbon nanotube array devices. ACS Nano, 6(8), 7303-7310. https://doi.org/10.1021/nn302416e

Spatially resolved electrostatic potential and photocurrent generation in carbon nanotube array devices. / Engel, Michael; Steiner, Mathias; Sundaram, Ravi S.; Krupke, Ralph; Green, Alexander A.; Hersam, Mark C; Avouris, Phaedon.

In: ACS Nano, Vol. 6, No. 8, 28.08.2012, p. 7303-7310.

Research output: Contribution to journalArticle

Engel, M, Steiner, M, Sundaram, RS, Krupke, R, Green, AA, Hersam, MC & Avouris, P 2012, 'Spatially resolved electrostatic potential and photocurrent generation in carbon nanotube array devices', ACS Nano, vol. 6, no. 8, pp. 7303-7310. https://doi.org/10.1021/nn302416e
Engel, Michael ; Steiner, Mathias ; Sundaram, Ravi S. ; Krupke, Ralph ; Green, Alexander A. ; Hersam, Mark C ; Avouris, Phaedon. / Spatially resolved electrostatic potential and photocurrent generation in carbon nanotube array devices. In: ACS Nano. 2012 ; Vol. 6, No. 8. pp. 7303-7310.
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