Ammonia sensing properties of a Pt/AlGaN/GaN schottky diode

Tai You Chen, Huey Ing Chen, Yi Jung Liu, Chien Chang Huang, Chi Shiang Hsu, Chung Fu Chang, Wen Chau Liu

研究成果: Article同行評審

27 引文 斯高帕斯(Scopus)


An interesting Pt/AlGaN/GaN Schottky-type ammonia gas sensor is fabricated and studied. Both the steady-and transient-state behaviors of ammonia adsorption reactions are investigated. At 150 °C, significant ammonia detection is observed under a low ammonia concentration of 35-ppm NH3/air. Moreover, a high ammonia sensing response of 18300% and the large Schottky barrier variation ratio Δbb/air of 13.8% are observed upon exposure to a 1% NH3/air gas at 150 °C. The presence of dipoles at the metalsemiconductor interface leads to a lowering effect of Schottky barrier height and a larger current. In addition, based on thermodynamics, in contrast with a hydrogen adsorption reaction, the ammonia adsorption reaction is an endothermic reaction. Consequently, the studied NH3 sensor structure provides the promise to integrate high-performance AlGaN/GaN-based optoelectronic and microwave devices on a single chip.

頁(從 - 到)1541-1547
期刊IEEE Transactions on Electron Devices
出版狀態Published - 2011 5月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 電氣與電子工程


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