Modulated gas sensor based on vertical organic diode with blended channel for ppb-regime detection

Ming Yen Chuang, Jian Nan Chen, Hsiao Wen Zan*, Chia Jung Lu, Hsin Fei Meng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


We demonstrate an extremely sensitive ammonia gas sensor based on vertical organic diode to exhibit a 1 ppb detection limit. Using phenyl-C61-butyric acid methyl ester (PCBM) as the sensing layer, the nano-porous structure enlarges the surface to volume ratio and hence realizes the ppb-regime sensitivity. The proposed vertical nano-junction (VNJ) organic diode is then investigated by changing the semiconducting materials (i.e. sensing material). In addition to a pure n-type or p-type sensing material, the blend of n/p organic semiconductor (PCBM/P3HT) is used to react with gas. Changing the n/p blending ratio from 0 to 100% delivers a tunable gas response to ammonia and nitric oxide, hence demonstrating a sensing map concept with good selectivity.

Original languageEnglish
Pages (from-to)223-230
Number of pages8
JournalSensors and Actuators, B: Chemical
Publication statusPublished - 2016 Jul


  • Ammonia
  • Blended
  • Gas sensor
  • P3HT
  • PCBM
  • Vertical

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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