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Oxide semiconductor based deep-subthreshold operated read-out electronics for all-printed smart sensor patches.
Jyoti Ranjan Pradhan1, Sushree Sangita Priyadarsini1, Sanjana R Nibgoor1
1Department of Materials Engineering Indian Institute of Science (IISc) Bangalore Karnataka India.
Exploration (Beijing, China)
|March 5, 2025
Summary
Researchers developed printed amorphous indium-gallium-zinc oxide (a-IGZO) thin film transistors (TFTs) for smart sensor patches. These TFTs enable signal digitalization and visual recognition, operating at low voltages for standalone detection.
Area of Science:
- Materials Science
- Electronics Engineering
- Sensor Technology
Background:
- Solution-processed oxide thin film transistors (TFTs) offer high mobility electron transport.
- Printed oxide TFTs have been underexplored at sensor interfaces.
- Smart sensor patches require integrated read-out electronics.
Purpose of the Study:
- To develop printed amorphous indium-gallium-zinc oxide (a-IGZO) TFTs for smart sensor applications.
- To integrate signal amplifiers and analog-to-digital converters (ADCs) using printed TFTs.
- To demonstrate a functional smart sensor patch with low-voltage operation.
Main Methods:
- Fabrication of a-IGZO-based deep-subthreshold operated TFTs using commercial printing techniques.
- Integration of TFTs into signal amplifiers and analog-to-digital converters (ADCs).
- Development of a current drive circuit for visual signal recognition.
Main Results:
- Successfully digitalized analog sensor signals up to 1 kHz using printed a-IGZO TFTs.
- Demonstrated easy-to-detect visual recognition of sensor signals via a current drive circuit.
- Achieved low-voltage operation (≤2 V) for the entire smart sensor patch.
Conclusions:
- Printed a-IGZO TFTs are suitable for fabricating smart sensor patches with integrated electronics.
- The developed sensor patch enables standalone detection and is compatible with on-chip energy sources.
- This technology holds potential for diverse applications requiring low-power, integrated sensing.
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