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 journalArticlepeer-review

26 Citations (Scopus)

Abstract

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
Volume13
Issue number2
DOIs
Publication statusPublished - 2014 Mar

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering

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