Monolithic Tandem Multicolor Image Sensor Based on Electrochromic Color-Radix Demultiplexing

Area of Science:

• Optoelectronics
• Materials Science
• Semiconductor Technology

Background:

• Advanced semiconductor technology relies on optical data acquisition for spatial and temporal processing.
• Vertical integration of photodetectors is key to surpassing current technological limits.
• Monolithic integration challenges have hindered complex vertical photodetector designs.

Purpose of the Study:

• To introduce an electrochromic device architecture for monolithic tandem multicolor photodetectors.
• To demonstrate a device capable of regulating charge transport for various illumination wavelengths.
• To develop an optoelectronic logic sensor for accurate color and wavelength demultiplexing.

Main Methods:

• Fabrication of a monolithic tandem multicolor photodetector using vertically stacked p-type and n-type graphene barristors.
• Characterization of the device's charge transport behavior under different illumination wavelengths.
• Utilization of anti-ambipolar charge transport for voltage-controlled photoconductive gain spectra.

Main Results:

• The electrochromic device architecture enables monolithic integration of multicolor photodetectors.
• The device successfully regulates balanced charge transport across a range of wavelengths.
• Variable anti-ambipolar charge transport provides sensitive voltage-controlled photoconductive gain.
• An optoelectronic logic sensor was fabricated, achieving high color accuracy in demultiplexing color coordinates.

Conclusions:

• The developed electrochromic device architecture overcomes monolithic integration limitations for vertical photodetectors.
• This technology advances optical data acquisition capabilities for semiconductor applications.
• The optoelectronic logic sensor offers a promising solution for precise color and wavelength sensing.