Photoconductive properties of selenium nanowire photodetectors

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • L. B. Luo
  • J. S. Jie
  • Z. H. Chen
  • X. J. Zhang
  • X. Fan
  • G. D. Yuan
  • Z. B. He
  • W. F. Zhang
  • S. T. Lee

Detail(s)

Original languageEnglish
Pages (from-to)6292-6298
Journal / PublicationJournal of Nanoscience and Nanotechnology
Volume9
Issue number11
Publication statusPublished - Nov 2009

Abstract

Selenium nanowires with a diameter of about 70 nm and a growth direction along [001] were fabricated via a facile solution method. Photoconductive properties of Se wires were systematically characterized via photodetectors made of single Se nanowire. The photodetectors exhibited a high light on-off current ratio (/ light// dark) of 450, and a fast light response speed of millisecond rise/fall time with excellent stability and reproducibility. It was also observed that the response time strongly depend on the intensity of the illumination light: the rise time and fall time for a typical photodetector is 0.68/1.85, 0.53/1.70, 0.54/1.65, 0.51/1.59, and 0.49/1.58 ms for light intensity of 0.18, 0.26, 0.43, 0.96, and 1.89 mW/cm 2, respectively, and the relationship between the light intensity and the photocurrent can be fitted by using a simple power law. The diameters of the nanowire were found to have a significant influence on the response speed with smaller Se nanowires showing higher response speed. Finally, the mechanisms of photoconduction and factors affecting the performance of the photodetectors were elucidated. Copyright © 2009 American Scientific Publishers.

Research Area(s)

  • Photoconductivity, Photodetector, Response time, Selenium nanowires

Citation Format(s)

Photoconductive properties of selenium nanowire photodetectors. / Luo, L. B.; Jie, J. S.; Chen, Z. H.; Zhang, X. J.; Fan, X.; Yuan, G. D.; He, Z. B.; Zhang, W. F.; Zhang, W. J.; Lee, S. T.

In: Journal of Nanoscience and Nanotechnology, Vol. 9, No. 11, 11.2009, p. 6292-6298.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review