CMOS buried quad p-n junction photodetector for multi-wavelength analysis

Area of Science:

• Photonics
• Integrated Optics
• Biomedical Engineering

Background:

• Traditional spectral analysis often requires bulky equipment like spectrometers.
• There is a growing need for miniaturized, integrated photonic solutions for biochemical analyses.
• Existing photodetectors may lack the sensitivity or spectral resolution for complex multi-analyte detection.

Purpose of the Study:

• To present a novel buried quad p-n junction (BQJ) photodetector fabricated using a high-voltage CMOS process.
• To demonstrate the device's capability for wavelength-sensitive measurements in compact, chip-based systems.
• To introduce a matrix-based method for analyzing compound spectra from the BQJ photodetector.

Main Methods:

• Fabrication of a buried quad p-n junction (BQJ) photodetector using a high-voltage CMOS process.
• Experimental measurement and modeling of the photodetector's spectral response.
• Development and validation of a matrix-based method for spectral component estimation.

Main Results:

• The BQJ photodetector was successfully fabricated and characterized for its spectral response.
• The device demonstrated wavelength sensitivity suitable for spectral analysis applications.
• The matrix-based analysis method accurately resolved spectral components in simulated multi-wavelength fluorescence emission.

Conclusions:

• The developed BQJ photodetector offers a compact, integrated solution for spectral analysis.
• This technology is well-suited for advanced labs-on-chip and miniaturized biosensors.
• The combination of the BQJ device and matrix analysis enables efficient chip-based biochemical sensing.