Improved dynamic properties of ZnO-based photo-transistor with polymer gate dielectric by ultraviolet treatment

Kimoon Lee, Ki Tae Kim, Jeong M. Choi, Min Suk Oh, D. K. Hwang, Sungjin Jang, Eugene Kim, Seongil Im

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The authors report on the fabrication of photo-detecting top-gate ZnO-based thin-film transistors (ZnO-TFTs) with poly-4-vinylphenol (PVP) polymer gate dielectric. A ZnO channel surface was treated by intense ultraviolet (UV, wavelength of 352 nm) before making contacts with PVP dielectric. Although our UV-treated devices showed lower on-state current than untreated pristine ones, the former also displayed orders of magnitude lower off-state current than the latter. We applied the UV-treated devices for enhancing their photo-detection properties, which basically needs low off-state current. Under a modulated photon signal (10 Hz, 364 nm) for the UV detection measurements, our photo-inverter with UV-treated ZnO-TFT exhibited a good dynamic property of ∼30 ms operating at 5 V.

Original languageEnglish
Article number135102
JournalJournal of Physics D: Applied Physics
Volume41
Issue number13
DOIs
Publication statusPublished - 2008 Jul 7

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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