What question did this study set out to answer?

Develop compact, highly selective, and fast organic photodiodes capable of directly distinguishing the handedness of circularly polarized light without external optical filters.

November 2, 2021Advanced Optical MaterialsOpen Access

Highly Selective High‐Speed Circularly Polarized Photodiodes Based on π‐Conjugated Polymers

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Authors

MWMatthew D. WardImperial College London JWJessica WadeImperial College London XSXingyuan ShiCentral South University

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Implication

Experimental study demonstrates high-speed circularly polarized photodetection in organic bilayer devices, suggesting direct applications in secure optical communications.

Key Points

Develop compact, highly selective, and fast organic photodiodes capable of directly distinguishing the handedness of circularly polarized light without external optical filters.
Fabricated bilayer organic photodiodes composed of an achiral π-conjugated polymer blended with a chiral additive as the electron donor layer alongside an achiral C60 electron acceptor layer.
Systematically varied the thicknesses of both the donor and acceptor layers to evaluate effects on dark current, optical dissymmetry, and response speed.
Achieved a photocurrent dissymmetry factor (|g_ph|) as high as 0.85 with low dark currents down to 10 pA and a linear dynamic range of 80 dB.
Demonstrated rise and fall response times of approximately 7 µs, significantly surpassing previous circularly polarized photodetectors while identifying a direct trade-off between external quantum efficiency and dissymmetry.

Cite This Study

Ward et al. (2021) studied this question.

synapsesocial.com/papers/69da29c3a6045d71bfa3c6a3 https://doi.org/10.1002/adom.202101044

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Implication

Experimental study demonstrates high-speed circularly polarized photodetection in organic bilayer devices, suggesting direct applications in secure optical communications.

Highly Selective High‐Speed Circularly Polarized Photodiodes Based on π‐Conjugated Polymers

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Implication

Key Points

Cite This Study

Highly Selective High‐Speed Circularly Polarized Photodiodes Based on π‐Conjugated Polymers

Discussion

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Implication

Key Points

Cite This Study

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