Gate dependent photo-responses of carbon nanotube field effect phototransistors

H. Z. Chen, N. Xi, K. W.C. Lai, L. L. Chen, R. G. Yang, B. Song

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Gate dependent photoconductivity of carbon nanotube (CNT) field effect phototransistors (FEPs) was systematically investigated in this study. The photo-response comparisons of CNT FEPs with symmetric and asymmetric metal structures connecting to the same CNT revealed that the gate effect contributed to a sensitivity improvement with a lower dark current, a higher photocurrent, and an enhanced photovoltage. A functionalized asymmetric FEP, fabricated by partially doping the CNT utilizing a polyethylene imine (PEI) polymer, verified that FEPs delivered a better performance by using asymmetric structures. A multi-gate FEP, with three pairs of side-gates that can electrostatically dope different sections of a CNT independently, was fabricated to examine the gate structure dependent photo-responses. Experimental measurements showed an unconventional photocurrent improvement that was weakly dependent on the gate location, which was attributed to the unique charge distribution of one-dimensional semiconductors.

Original languageEnglish (US)
Article number385203
JournalNanotechnology
Volume23
Issue number38
DOIs
StatePublished - Sep 28 2012

Fingerprint

Phototransistors
Carbon Nanotubes
Carbon nanotubes
Photocurrents
Imines
Dark currents
Charge distribution
Photoconductivity
Polyethylene
Polyethylenes
Polymers
Metals
Doping (additives)
Semiconductor materials

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Cite this

Gate dependent photo-responses of carbon nanotube field effect phototransistors. / Chen, H. Z.; Xi, N.; Lai, K. W.C.; Chen, L. L.; Yang, R. G.; Song, B.

In: Nanotechnology, Vol. 23, No. 38, 385203, 28.09.2012.

Research output: Contribution to journalArticle

Chen, H. Z. ; Xi, N. ; Lai, K. W.C. ; Chen, L. L. ; Yang, R. G. ; Song, B. / Gate dependent photo-responses of carbon nanotube field effect phototransistors. In: Nanotechnology. 2012 ; Vol. 23, No. 38.
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