Ultrasensitive detection of hydrogen sulfide gas based on perovskite vertical channel chemo-sensor

Kuan Yi Lee, Ju Chun Hsieh, Chi An Chen, Wei Lun Chen, Hsin Fei Meng, Chia Jung Lu, Sheng Fu Horng*, Hsiao Wen Zan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


An ultrasensitive hydrogen sulfide gas sensor based on methylammonium lead perovskite is reported in this work. The pseudohalide molecular anion (SCN) was introduced as a dopant in the perovskite-based active layer of the sensor. With the enlarged operational current provided by the vertical structure of the sensors, both the MAPbI3-x(SCN)x-based and the MAPbI3-based gas sensors exhibit excellent ppb-regime (∼200 ppb) hydrogen sulfide gas sensing capability. Particularly, with the SCN doped, the MAPbI3-x(SCN)x-based gas sensor demonstrates an enhanced sensitivity and a much improved ambient air endurance by extending the device lifetime more than 5 days. Finally, we also conducted experiments to study the effects of relative humidity and light irradiation on sensing performance. Preliminary mechanisms were also proposed.

Original languageEnglish
Article number128988
JournalSensors and Actuators, B: Chemical
Publication statusPublished - 2021 Jan 1


  • Gas sensor
  • Hydrogen sulfide
  • Ppb-regime
  • SCN-doped perovskite
  • Sensing in air

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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