Novel hydrogen gas sensing by palladium electrode on dielectric capacitor coupled with an amorphous InGaZnO thin-film transistor

Young Tack Lee, Junyeong Lee, Hyuncheol Hwang, Hwaebong Jung, Wooyoung Lee, Heesun Bae, Seongil Im

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Palladium (Pd) is well known for its capability to selectively detect hydrogen (H2) gas, where the detection process involves absorbing hydrogen gas molecules to form compound palladium hydrides. Such Pd-H interaction leads to the increase of electrical resistance and volume of Pd, simultaneously lowering its work function. These Pd-based hydrogen sensors would be more beneficial when connected to conventional semiconductor integrated circuits. Here, we utilize the Pd film as H-sensing electrode for metal/SiO2/p+-Si (MIM) capacitor, since we found the H-induced chain reactions in Pd/SiO2/p+-Si capacitor:Pd volume expansion, Pd-SiO2 contact are change, and the capacitance change. This capacitance change is connected to the gate of an electrically stable amorphous InGaZnO (a-IGZO) thin-film transistor (TFT). As a result, H-induced output as the drain current of a-IGZO TFT was statically and dynamically measured through the capacitance signal change from Pd-MIM sensor. This output current signal was converted to voltage when a load resistor was connected to the a-IGZO TFT in series. These sensor circuit configurations are regarded promising and novel because of their simplicity and practicality.

Original languageEnglish
Pages (from-to)490-495
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume209
DOIs
Publication statusPublished - 2015 Mar 31

Fingerprint

Palladium
Amorphous films
Thin film transistors
palladium
Hydrogen
capacitors
Capacitors
transistors
Gases
Electrodes
electrodes
hydrogen
thin films
gases
MIM (semiconductors)
Capacitance
capacitance
sensors
Sensors
Palladium compounds

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
  • Materials Chemistry

Cite this

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abstract = "Palladium (Pd) is well known for its capability to selectively detect hydrogen (H2) gas, where the detection process involves absorbing hydrogen gas molecules to form compound palladium hydrides. Such Pd-H interaction leads to the increase of electrical resistance and volume of Pd, simultaneously lowering its work function. These Pd-based hydrogen sensors would be more beneficial when connected to conventional semiconductor integrated circuits. Here, we utilize the Pd film as H-sensing electrode for metal/SiO2/p+-Si (MIM) capacitor, since we found the H-induced chain reactions in Pd/SiO2/p+-Si capacitor:Pd volume expansion, Pd-SiO2 contact are change, and the capacitance change. This capacitance change is connected to the gate of an electrically stable amorphous InGaZnO (a-IGZO) thin-film transistor (TFT). As a result, H-induced output as the drain current of a-IGZO TFT was statically and dynamically measured through the capacitance signal change from Pd-MIM sensor. This output current signal was converted to voltage when a load resistor was connected to the a-IGZO TFT in series. These sensor circuit configurations are regarded promising and novel because of their simplicity and practicality.",
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Novel hydrogen gas sensing by palladium electrode on dielectric capacitor coupled with an amorphous InGaZnO thin-film transistor. / Lee, Young Tack; Lee, Junyeong; Hwang, Hyuncheol; Jung, Hwaebong; Lee, Wooyoung; Bae, Heesun; Im, Seongil.

In: Sensors and Actuators, B: Chemical, Vol. 209, 31.03.2015, p. 490-495.

Research output: Contribution to journalArticle

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AU - Lee, Young Tack

AU - Lee, Junyeong

AU - Hwang, Hyuncheol

AU - Jung, Hwaebong

AU - Lee, Wooyoung

AU - Bae, Heesun

AU - Im, Seongil

PY - 2015/3/31

Y1 - 2015/3/31

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AB - Palladium (Pd) is well known for its capability to selectively detect hydrogen (H2) gas, where the detection process involves absorbing hydrogen gas molecules to form compound palladium hydrides. Such Pd-H interaction leads to the increase of electrical resistance and volume of Pd, simultaneously lowering its work function. These Pd-based hydrogen sensors would be more beneficial when connected to conventional semiconductor integrated circuits. Here, we utilize the Pd film as H-sensing electrode for metal/SiO2/p+-Si (MIM) capacitor, since we found the H-induced chain reactions in Pd/SiO2/p+-Si capacitor:Pd volume expansion, Pd-SiO2 contact are change, and the capacitance change. This capacitance change is connected to the gate of an electrically stable amorphous InGaZnO (a-IGZO) thin-film transistor (TFT). As a result, H-induced output as the drain current of a-IGZO TFT was statically and dynamically measured through the capacitance signal change from Pd-MIM sensor. This output current signal was converted to voltage when a load resistor was connected to the a-IGZO TFT in series. These sensor circuit configurations are regarded promising and novel because of their simplicity and practicality.

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