Photocurrent and photoluminescence characteristics of networked GaN nanowires

Myungil Kang, Jong Soo Lee, Sung Kyu Sim, Hyunsuk Kim, Byungdon Min, Kyoungah Cho, Gyu Tae Kim, Man Young Sung, Sangsig Kim, Hyon Soo Han

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The dark current, photocurrent and photoluminescence (PL) of networked GaN nanowires were characterized in this study. GaN nanowires were synthesized from Ni particles dispersed on an alumina substrate, and subsequent Ti deposition was performed on the as-synthesized GaN nanowires to form electrodes. For the networked GaN nanowires, a significant dark current was observed and the I-V characteristics of the dark current and photocurrent were independent of temperature in magnitude and shape. These results indicate that the GaN nanowires were networked electrically between the electrodes and that the electronic states of these nanowires were degenerate. In addition, the correlation between the photocurrent and PL of the networked GaN nanowires was examined. The characteristics of the green-band emission were similar to those of the photoresponse, and the wavelength range of the green-band emission exactly overlapped that of the below-gap absorption band in the photocurrent spectra. These results indicate that the green emission and the photoresponse have a common origin.

Original languageEnglish
Pages (from-to)6868-6872
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume43
Issue number10
DOIs
Publication statusPublished - 2004 Oct

Keywords

  • Ball milling
  • Green-band emission
  • Networked GaN nanowires
  • Photocurrent
  • Photoluminescence

ASJC Scopus subject areas

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

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