Porous organic TFTs for the applications on real-time and sensitive gas sensors

Hsiao-Wen Zan*, Ming Zhi Dai, Ting Yu Hsu, Hung Cheng Lin, Hsin-Fei Meng, Yuh-Shyong Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


A pentacene-based organic thin-film transistor (OTFT) with a porous active layer is demonstrated for the first time. The porous OTFT exhibits a fast, sensitive, and reversible response to ammonia gas with a detection limit as 500 ppb, whereas the OTFT without porous structure has a slow response and a poor recovery behavior. The sensing mechanism dominated by the dissociation of hydroxyl groups of the polymer dielectric layer is raised and discussed. The proposed device is the first OTFT-based ammonia sensor with reversible response and high sensitivity in low parts-per-million range. It is promising for the development of a diagnostic breath analysis system.

Original languageEnglish
Article number5871674
Pages (from-to)1143-1145
Number of pages3
JournalIeee Electron Device Letters
Issue number8
StatePublished - Aug 2011


  • Ammonia
  • gas sensor
  • pentacene
  • porous
  • thin-film transistor (TFT)


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