Thermodynamic sensing mechanisms of AlGaN-based metal/reactive insulator/semiconductor-type hydrogen sensors

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Abstract

Thermodynamic sensing mechanisms of Pt/reactive insulator/AlGaN hydrogen sensors were studied. The reactive insulator layer of mixed Ga 2O 3 and Al 2O 3 was grown directly from the AlGaN layer using a photoelectrochemical oxidation method. The current of the hydrogen sensors exhibited considerable response under forward bias in a hydrogen ambient at the temperature range between 350 K and 550 K. Based on the steady-state analysis, the adsorption enthalpy of -11.64kJ/mol for hydrogen adsorbed at the interface and in the reactive insulator layer was obtained. Because the kinetic reaction was an exothermic action, the hydrogen response decreased with an increase of operating temperatures. From the thermodynamic kinetic analysis of transient responses, the activation energy was 3.57 kJ/mol. The Pt/reactive insulator/AlGaN hydrogen sensors exhibited high performance at various temperatures.

Original languageEnglish
Article number6059470
Pages (from-to)1450-1454
Number of pages5
JournalIEEE Sensors Journal
Volume12
Issue number5
DOIs
Publication statusPublished - 2012 Apr 24

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Electrical and Electronic Engineering

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