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

30 Scopus citations


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
Pages (from-to)1-8
Number of pages8
JournalSensors and Actuators, B: Chemical
StatePublished - 1 Jan 2021


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


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