Photocarrier relaxation behavior of a single ZnO nanowire UV photodetector: Effect of surface band bending

Ming Wei Chen*, Jose Ramon Duran Retamal, Cheng Ying Chen, Jr-Hau He

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


The surface effect on the photocarrier relaxation behavior using a single ZnO nanowire (NW) ultraviolet (UV) photodetector has been evaluated. The pronounced surface effect leads to the enhancement-mode field-effect-transistor behavior in dark and accounts for the slow relaxation behavior after switching off the illumination. The recovery of photocurrent is found to be strongly related to the intensity of UV light and the diameter of NWs, indicating that the photocarrier relaxation behavior is dominated by surface band bending (SBB). A model for the relaxation behavior based on the SBB of NWs is proposed to interpret the experimental results.

Original languageEnglish (US)
Article number6144690
Pages (from-to)411-413
Number of pages3
JournalIEEE Electron Device Letters
Issue number3
StatePublished - Mar 1 2012


  • Nanowire (NW)
  • ZnO
  • photodetector
  • relaxation time
  • surface band bending (SBB)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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