MgxZn1−xO Thin-Film Transistor-Based UV Photodetector with Enhanced Photoresponse

Chieh Jen Ku, Pavel Reyes, Ziqing Duan, Wen Chiang Hong, Rui Li, Yicheng Lu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


ZnO and its ternary alloy MgxZn1−xO (MZO) are promising wide-band-gap semiconductor materials well-suited to UV detection. The Mg content of MZO facilitates energy band gap engineering, enabling fabrication of UV photodetectors that can operate in the deep-UV region. Different types of UV photodetector based on ZnO have been reported, including photoconductive, Schottky, and transistor types. Transistor-based photodetectors have the advantage of being three-terminal devices, thus enabling biasing control and implementation in addressable arrays. In this paper we report an MZO thin-film-transistor (TFT)-based UV photodetector. The device has a low dark current (2 × 10−14 A) and an ON/OFF ratio of 1011. We show that by using a small amount of Mg (5%) in the MZO TFT we can substantially improve the photoresponse recovery time of the photodetector to 15 ms compared with 42 ms for a similar TFT with 0% Mg. We also observed a shift in the cutoff wavelength from 377.21 nm for the 0% Mg TFT photodetector down to 370.96 nm for the MZO TFT photodetector. We attribute the enhanced recovery time improvement of the MZO TFT UV photodetector to suppression of oxygen vacancies as a result of incorporation of the Mg in the MZO.

Original languageEnglish (US)
Pages (from-to)3471-3476
Number of pages6
JournalJournal of Electronic Materials
Issue number10
StatePublished - Oct 5 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry


  • MgZnO
  • UV photodetectors
  • ZnO
  • thin-film transistors

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