Organic donor-acceptor heterojunctions for high performance circularly polarized light detection

Area of Science:

• Organic electronics
• Photonics
• Materials science

Background:

• Development of efficient and stable organic circularly polarized light photodetectors is crucial for integrated photonic applications.
• Chiral semiconductors often exhibit low field-effect mobilities, limiting performance in circularly polarized light detection.

Purpose of the Study:

• To create a multi-wavelength circularly polarized light photodetector with enhanced performance.
• To overcome the limitations of low mobility in chiral semiconductors for photodetector applications.

Main Methods:

• Fabrication of a donor-acceptor heterojunction photodetector.
• Utilizing efficient exciton separation in a chiral acceptor layer.
• Employing organic field-effect transistors with low defect density interfaces.

Main Results:

• Achieved a photocurrent dissymmetry value of 0.24 and responsivity of 0.28 A/W in air.
• Demonstrated excellent photodetector stability with minimal current roll-off (3-4% over 500 cycles).
• Successfully implemented the photodetector for real-time circularly polarized light communication.

Conclusions:

• The novel donor-acceptor heterojunction strategy effectively addresses mobility limitations in chiral semiconductors.
• The developed photodetector shows promise for high-performance, stable, and multi-wavelength circularly polarized light detection.
• This work paves the way for large-scale circularly polarized light integrated photonic applications.