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Multi-spectral GeSe/PbTe phototransistor for wearable optical medicine.
Optics Letters
|August 2, 2025
Summary
A new flexible phototransistor using GeSe/PbTe heterostructures detects short-wave infrared light for non-invasive blood glucose monitoring. This wearable device offers improved accuracy and stability for healthcare applications.
Area of Science:
- Materials Science
- Biomedical Engineering
- Optoelectronics
Background:
- Traditional flexible photodetectors face limitations in spectral range, stability, and biodegradability, hindering wearable medical device development.
- The need for advanced sensors in healthcare necessitates novel materials and designs for improved performance and functionality.
Purpose of the Study:
- To develop a printable, flexible phototransistor with enhanced performance for healthcare applications.
- To utilize a GeSe/PbTe heterostructure for short-wave infrared (SWIR) detection and optimize optoelectronic properties through in-plane anisotropy.
- To integrate the phototransistor with a flexible printed circuit board (FPCB) for photoplethysmography (PPG) signal extraction and blood glucose level prediction.
Main Methods:
- Fabrication of a GeSe/PbTe heterostructure-based phototransistor with a square spiral interdigitated electrode pattern.
- Optimization of optoelectronic performance via in-plane anisotropy for SWIR detection.
- Integration with FPCB for PPG signal acquisition and analysis using a partial least squares regression model for blood glucose prediction.
Main Results:
- The phototransistor demonstrated excellent dynamic performance: detectivity (7.2 × 10^12 Jones), responsivity (6.7 A/W), and fast response/recovery times (70-72 ms).
- The device exhibited good mechanical stability and achieved a 10% relative error in blood glucose level prediction.
- A high correlation coefficient (R = 0.928) was achieved, indicating accurate medical insights from PPG signals.
Conclusions:
- The developed GeSe/PbTe flexible phototransistor offers a promising solution for advanced wearable medical devices, particularly for non-invasive blood glucose monitoring.
- The multi-spectral design and optimized electrode pattern enhance signal quality and accuracy, aiding in noise reduction and effective information extraction.
- This technology provides a foundation for more accurate and reliable medical insights for both clinicians and patients.
