Enhancement of hydrogen sensing performance of a GaN-based Schottky diode with a hydrogen peroxide surface treatment

Chun Chia Chen, Huey-Ing Chen, I-Ping Liu, Hao Yeh Liu, Po Cheng Chou, Jian Kai Liou, Wen-Chau Liu

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In this work, enhanced hydrogen sensing characteristics of a GaN-based Schottky diode-type sensor with a GaO x layer are studied and demonstrated. A thin GaO x layer inserted in Pd/GaN interface is oxidized by the immersion in an H 2 O 2 solution at room temperature. Experimentally, a significantly high hydrogen sensing response of 1.8 × 10 5 and a large Schottky barrier height variation ratio of 33.1% are found upon exposure to a 1% H 2 /air gas at 300 K. In addition, a very low detection limit of 0.1 ppm H 2 /air at 300 K is obtained. These improved properties could be attributed to the effective dissociation of hydrogen molecules and rougher Pd surface caused by the presence of the GaO x layer. The response (recovery) time constant of 13.3 (23.6) s is obtained upon exposure to a 1% H 2 /air gas at 300 K. The related hydrogen adsorption analysis of the proposed device is also studied and demonstrated.

Original languageEnglish
Pages (from-to)303-309
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume211
DOIs
Publication statusPublished - 2015 Jan 1

Fingerprint

Schottky diodes
surface treatment
hydrogen peroxide
Hydrogen peroxide
Hydrogen Peroxide
Surface treatment
Hydrogen
Diodes
augmentation
hydrogen
air
Air
Gases
gases
submerging
time constant
recovery
dissociation
Adsorption
Recovery

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 = "In this work, enhanced hydrogen sensing characteristics of a GaN-based Schottky diode-type sensor with a GaO x layer are studied and demonstrated. A thin GaO x layer inserted in Pd/GaN interface is oxidized by the immersion in an H 2 O 2 solution at room temperature. Experimentally, a significantly high hydrogen sensing response of 1.8 × 10 5 and a large Schottky barrier height variation ratio of 33.1{\%} are found upon exposure to a 1{\%} H 2 /air gas at 300 K. In addition, a very low detection limit of 0.1 ppm H 2 /air at 300 K is obtained. These improved properties could be attributed to the effective dissociation of hydrogen molecules and rougher Pd surface caused by the presence of the GaO x layer. The response (recovery) time constant of 13.3 (23.6) s is obtained upon exposure to a 1{\%} H 2 /air gas at 300 K. The related hydrogen adsorption analysis of the proposed device is also studied and demonstrated.",
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Enhancement of hydrogen sensing performance of a GaN-based Schottky diode with a hydrogen peroxide surface treatment. / Chen, Chun Chia; Chen, Huey-Ing; Liu, I-Ping; Liu, Hao Yeh; Chou, Po Cheng; Liou, Jian Kai; Liu, Wen-Chau.

In: Sensors and Actuators, B: Chemical, Vol. 211, 01.01.2015, p. 303-309.

Research output: Contribution to journalArticle

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AU - Chen, Chun Chia

AU - Chen, Huey-Ing

AU - Liu, I-Ping

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AU - Chou, Po Cheng

AU - Liou, Jian Kai

AU - Liu, Wen-Chau

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