Enhancement of field-emission properties in ZnO nanowire array by post-annealing in H 2 ambient

Kyung Soo Park, Young Jin Choi, Myoung Won Ahn, Dong-Wan Kim, Yun Mo Sung, Jae Qwan Park, Kyoung Jin Choi

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We studied the effects of post-annealing in H 2 and O 2 ambients on field-emission properties of vertically-aligned ZnO nanowire arrays synthesized by carbothermal reduction process. The turn-on electric field was dramatically decreased from 3.78 to 2.37 V/μm after post-annealing in H 2 ambient, which was explained by both hydrogen passivation effects of deep levels and surface modification. In other words, we could observe significant decrease of deep level peak in photoluminescence measurements on hydrogen post-annealed ZnO nanowire array. And also hydrogen-related bonds are strongly increased from X-ray photoelectron spectroscopy measurements. These findings suggest that the concentration of conduction electrons increased by hydrogen post-annealing, which results in the enhanced tunneling probability of conduction electrons into the vacuum.

Original languageEnglish
Pages (from-to)4328-4332
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume9
Issue number7
DOIs
Publication statusPublished - 2009 Jul 1

Keywords

  • Field emission
  • Nanowires
  • Post-annealing
  • Turn-on field
  • Work function

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering
  • Biomedical Engineering

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