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Photoelectric-Coupled Ferroelectric Heterojunctions for Ultrahigh NO2 Sensing With Polarization-Memory-Assisted

Liping Tan1, Xuefeng Hu1, Ming Zhou1

  • 1Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

We developed a novel ferroelectric heterostructure for multimodal artificial sensory systems. This device integrates light-driven polarization switching, memory, and enhanced gas sensing for bioinspired applications.

Keywords:
aurivillius‐type bi‐based perovskite heterostructureslight‐induced ferroelectric polarization switchingpersistent photoconductivity (PPC)photoelectric memoryroom‐temperature gas sensingsub‐ppb NO2 detection

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensory Systems

Background:

  • Ferroelectric oxide heterostructures offer potential for multimodal artificial sensory systems by coupling optical, electrical, and chemical stimuli.
  • Existing systems often lack integration of multiple sensory modalities and efficient stimulus response.

Purpose of the Study:

  • To develop a single-architecture heterojunction integrating light-driven ferroelectric polarization switching, photoelectric memory, and gas sensing.
  • To investigate the enhancement of gas-sensing performance through optoelectronic memory-mediated ferroelectric coupling.

Main Methods:

  • Epitaxial growth of Bi2WO6 (BWO) and ultrathin SrBi2Ta2O9 (SBT) films using laser molecular beam epitaxy.
  • Characterization of the heterojunction's interface properties, including band bending and photoinduced charge screening.
  • Evaluation of gas-sensing performance for NO2, focusing on response, detection limit, and sensitivity under varying conditions.

Main Results:

  • Achieved visible-light-induced polarization reversal and persistent photoconductivity (PPC) at the BWO/SBT interface.
  • Demonstrated a dramatic enhancement in NO2 gas sensing (530% response at 10 ppm), approximately 300-fold higher than electrically pre-polarized devices.
  • Reported a low detection limit (0.46 ppb) and high sensitivity (129.7% ppm-1) for the PPC-enhanced sensor, with excellent stability and humidity tolerance.

Conclusions:

  • The study provides evidence for non-linear optoelectronic memory-mediated ferroelectric coupling enhancing charge-transfer kinetics.
  • This ferroelectric heterostructure serves as a universal framework for self-adaptive gas sensors and multimodal bioinspired devices.
  • The integrated approach significantly advances the development of artificial sensory systems mimicking biological perception.