Enhanced UV photoresponse in nitrogen plasma ZnO nanotubes

N. Chantarat, Yu Wei Chen, San-Yuan Chen*, Chin Ching Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


The photoresponse behavior of one-dimensional ZnO nanowires (NWs) and nanotubes (NTs) grown on ITO-coated glass substrates via a wet-chemical route was investigated. The photoluminescence spectra exhibited a decrease in the deep-level intensity, indicating that the oxygen defects and impurities are occupied by the presence of N ions in the ZnO NT matrix after a nitrogen plasma treatment. I-V tests demonstrate an enhanced dark current (4.83 × 10 -7A) after an extended plasma treatment of up to 900 s for ZnO NTs compared to that (0.571 × 10-7A) of NWs. Furthermore, the ZnO NTs show the highest reliable photoresponse, 20 times that of NWs under UV irradiation (325nm) in air at room temperature. It is believed that nitrogen plasma ZnO nanotubes can potentially be useful in the designs of 1D ZnO-based solar cells and optoelectronic devices.

Original languageEnglish
Article number395201
Issue number39
StatePublished - 21 Sep 2009

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