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Trap-assisted circularly polarized organic photodetector
Hongki Kim1, Zhuoran Qiao2, Marie Houot2
1Department of Chemistry, Molecular Science Research Hub, Imperial College London, London, UK. hongki.kim@imperial.ac.uk.
Nature Communications
|April 26, 2026
Summary
This study introduces novel trap-assisted circularly polarized organic photodetectors. These devices achieve high sensitivity to light polarization by controlling charge trapping, enabling advanced imaging and encryption applications.
Area of Science:
- Organic electronics
- Chiral photonics
- Materials science
Background:
- Chiral π-conjugated molecules interact selectively with circularly polarized light.
- Current organic photodetectors rely on absorption for chiral light detection.
- Factors beyond absorption influencing device asymmetry are underexplored.
Purpose of the Study:
- To demonstrate trap-assisted circularly polarized organic photodetectors.
- To explore asymmetric trap filling based on light handedness.
- To enhance circularly polarized selectivity through modulated trap dynamics.
Main Methods:
- Utilizing blend systems with achiral acceptors.
- Investigating trap dynamics in photodetector operation.
- Developing large-area organic circularly polarized imaging systems.
Main Results:
- Achieved asymmetric trap filling dependent on circularly polarized light handedness.
- Demonstrated significantly enhanced circularly polarized selectivity via modulated trap dynamics.
- Realized a 4096-pixel large-area organic circularly polarized imaging system.
Conclusions:
- Trap-assisted mechanisms offer a new strategy for efficient circularly polarized photodetectors.
- Tailored carrier dynamics are crucial for optimizing device performance.
- The developed system shows potential for real-time visual encryption.
