ZnO-based ultraviolet photodetectors with novel nanosheet structures

Sheng Joue Young, Yi Hsing Liu, Chih Hung Hsiao, Shoou-Jinn Chang, Bo Chin Wang, Tsung Hsien Kao, Kai Shiang Tsai, San Lein Wu

Research output: Contribution to journalArticle

25 Citations (Scopus)


This study presents the fabrication of ZnO nanosheets on a glass substrate using a room-temperature (approximately 25 °C) solution method. The average length and diameter of the ZnO nanosheets were 1.2 μm and approximately 5 nm, respectively. The ultraviolet (UV)-to-visible rejection ratio of the sample is approximately 42 when biased at 1 V, and the fabricated UV photodetector is visible-blind with a sharp cutoff at 370 nm. The transient time constants measured during the rise time and fall time were τ r = 5.37 s and 6.02 s, respectively. The low-frequency noise spectra obtained from the UV photodetector were caused purely by the 1/ f noise. The noise-equivalent power and normalized detectivity (D*) of the ZnO nanosheet photodetector were 6.12 × 10 -9W and 2.17 × 10 9 cm·Hz0.5 W -1, respectively.

Original languageEnglish
Article number6704287
Pages (from-to)238-244
Number of pages7
JournalIEEE Transactions on Nanotechnology
Issue number2
Publication statusPublished - 2014 Mar 1

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering

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