Top-gate ZnO thin-film transistors with a polymer dielectric designed for ultraviolet optical gating

Kimoon Lee, Jeong M. Choi, D. K. Hwang, Min Suk Oh, J. K. Kim, Y. Jung, K. Oh, Seongil Im

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We report on the fabrication of ultraviolet (UV)-sensing top-gate ZnO thin-film transistors (TFTs) with a poly-4-vinylphenol (PVP) polymer gate dielectric on glass substrate. Our top-gate ZnO-TFT showed a field-effect mobility of 0.05 cm2/V s, maximum saturation current of 0.11 μA at a gate bias of 10 V and an on/off ratio of ∼103 in the dark. Under UV illumination with a wavelength of 364 nm the ZnO-TFT exhibited ∼4.7 μA for a drain current (at the same gate bias of 10 V), which is ∼50 times higher than without UV. Such photo-transistor action appeared more pronounced under a depletion regime of 0 V gate bias and the photo-to-dark current ratio was more than about 104. By adopting this high UV-sensitivity, our inverter device with the top-gate ZnO-TFT and a load resistance well demonstrated its optical gating behavior.

Original languageEnglish
Pages (from-to)69-73
Number of pages5
JournalSensors and Actuators, A: Physical
Volume144
Issue number1
DOIs
Publication statusPublished - 2008 May 28

Fingerprint

Thin film transistors
Polymers
transistors
polymers
thin films
Dark currents
Gate dielectrics
Drain current
Transistors
Lighting
Fabrication
Glass
Wavelength
dark current
Substrates
depletion
illumination
saturation
fabrication
glass

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering

Cite this

Lee, Kimoon ; Choi, Jeong M. ; Hwang, D. K. ; Oh, Min Suk ; Kim, J. K. ; Jung, Y. ; Oh, K. ; Im, Seongil. / Top-gate ZnO thin-film transistors with a polymer dielectric designed for ultraviolet optical gating. In: Sensors and Actuators, A: Physical. 2008 ; Vol. 144, No. 1. pp. 69-73.
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Top-gate ZnO thin-film transistors with a polymer dielectric designed for ultraviolet optical gating. / Lee, Kimoon; Choi, Jeong M.; Hwang, D. K.; Oh, Min Suk; Kim, J. K.; Jung, Y.; Oh, K.; Im, Seongil.

In: Sensors and Actuators, A: Physical, Vol. 144, No. 1, 28.05.2008, p. 69-73.

Research output: Contribution to journalArticle

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