Highly Selective Self-Powered Organic-Inorganic Hybrid Heterojunction of a Halide Perovskite and InGaZnO NO2Sensor

Mani Teja Vijjapu, Sandeep G. Surya, Jr Hau He, Khaled N. Salama*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Self-powered sensors can lead to disruptive advances in self-sustainable sensing systems that are imperative for evolving human lifestyles. For the first time, we demonstrate the fabrication of a heterojunction sensor using p-type hybrid-halide perovskites (CH3NH3PbBr3) and an n-type semiconducting metal oxide thin film [InGaZnO (IGZO)] for the detection of NO2 gas and power generation. Combining the excellent photoelectric properties of perovskites and the remarkable gas-sensing properties of IGZO at room temperature, the devised sensors generate open-circuit voltage and modulate according to the ambient NO2 concentration. The major challenge in devising self-powered gas sensors is to attain harvesting capability and selectivity simultaneously, owing to perovskites reactivity in the presence of oxygen and humidity. In this work, we developed a novel approach and fabricated a heterojunction sensor using parylene-c as an additional layer to curb the cross-sensitivity and to enhance the selectivity of the sensor. Even under the low concentrations of NO2, the developed sensor exhibits remarkable sensitivity, selectivity, and repeatability. The devices are sensitive and robust even under extreme humidity conditions (80% RH) and synthetic air. The devised sensor configuration is one way to eliminate the cross-sensitivity issue of the perovskite-based devices and serves as a reference for the development of self-powered sensors.

Original languageEnglish (US)
Pages (from-to)40460-40470
Number of pages11
JournalACS Applied Materials and Interfaces
Issue number34
StatePublished - Sep 1 2021

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society.


  • gas sensors
  • heterojunction sensors
  • IGZO
  • light-harvesting
  • organo-halide perovskite
  • parylene-c
  • self-powered sensor

ASJC Scopus subject areas

  • General Materials Science


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