Physical internal gain mechanisms of zno-based nanorod ultraviolet photodetectors

Tzu Shun Lin, Chia Hsun Chen, Ching Ting Lee

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13 Citations (Scopus)


The structure of the ZnO-based p-ZnO:LiNO 3 /i-ZnO/n-ZnO:In nanorod ultraviolet (UV) photodetectors was grown on sapphire substrates using the vapor cooling condensation system. To study the internal gain mechanisms of the photodetectors, the ZnO-based nanorods were photochemically passivated for different time and operated under various environments to vary the defect density resided on the sidewall surface of the ZnO-based nanorods. The mechanisms of the internal gain, which was attributed to the surface band bending effect of the ZnO-based nanorods induced from the sidewall surface defects and the absorbed oxygen molecules, were thus derived. The specific detectivity of 3.25 × 10 15 cmHz 1/2 W-1 was obtained for the ZnO-based nanorod UV photodetectors treated with the photoelectrochemical passivation process for 2 min.

Original languageEnglish
Article number7012057
Pages (from-to)759-762
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number7
Publication statusPublished - 2015 Apr 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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