A high-sensitive Pd/InGaP transistor hydrogen sensor

Chung Yeh Wu, Chin Tien Lin, Yen I. Chou, Chieng Chi Tung, Wen Chau Liu, Huey Ing Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this work, the electroless plated (EP) Pd/InGaP high electron mobility transistor (HEMT) was firstly employed for hydrogen sensing. The current-voltage (I-V) characteristics under hydrogen concentrations of 5ppm-1% and temperatures of 303-503K were investigated. Experimentally, the Pd gate of three-terminal devices were successfully fabricated by the electroless plating method, and the studied devices exhibited excellent current-voltage characteristics with superior current control ability. For hydrogen sensing performances, the studied EP device demonstrated low detection limit, high sensitivity, and fast response. As compared with the thermal evaporated (TE) device, larger current variations can be achieved by the EP device. Even at extremely low hydrogen concentration, e.g., 4.3 ppm H2/air, obvious current modulation was found. The maximum relative sensitivity reaches up to 428 % at a optimal gate voltage of -0.75 V. Furthermore, the transient detections showed that the sensing response was fairly fast, especially at high concentrations and high temperatures. At detection temperature of 403 K, the time for 90% response at 1 % H2/air was within 4 seconds. These excellent sensing performances of the EP device indeed made it promising and competitive in future developments of smart hydrogen sensors integrated microelectronic systems.

Original languageEnglish
Title of host publicationESSDERC07 - 2007 37th European Solid State Device Research Conference
PublisherIEEE Computer Society
Number of pages4
ISBN (Print)1424411238, 9781424411238
Publication statusPublished - 2007 Jan 1
EventESSDERC 2007 - 37th European Solid-State Device Research Conference - Munich, Germany
Duration: 2007 Sep 112007 Sep 13

Publication series

NameESSDERC 2007 - Proceedings of the 37th European Solid-State Device Research Conference


OtherESSDERC 2007 - 37th European Solid-State Device Research Conference

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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