Highly selective high-speed circularly polarized photodiodes based on π-conjugated polymers
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OA Location
Author(s)
Type
Journal Article
Abstract
Chiral π-conjugated molecular systems that are intrinsically sensitive to the handedness of circularly polarized (CP) light potentially allow for miniaturized, low-cost CP detection devices. Such devices promise to transform several technologies, including biosensing, quantum optics, and communication of data encrypted by exploiting the spin angular momentum of light. Here a simple, bilayer organic photodiode (CP OPD) comprising an achiral π-conjugated polymer–chiral additive blend as the electron donor layer and an achiral C60 electron acceptor layer is realized. These devices exhibit considerable photocurrent dissymmetry gph, with absolute values as high as 0.85 and dark currents as low as 10 pA. Impressively, they showcase a linear dynamic range of 80 dB, and rise and fall times of ≈7 µs, which significantly outperforms all previously reported CP selective photodetectors. Mechanistically, it is shown that the gph is sensitive to the thickness of both the chiral donor and achiral acceptor layers and that a trade-off exists between the external quantum efficiency and gph. The fast-switching speeds of these devices, coupled with their large dynamic range and highly selective response to CP light, opens up the possibility of their direct application in CP sensing and optical communications.
Date Issued
2022-01-18
Date Acceptance
2021-10-01
Citation
Advanced Optical Materials, 2022, 10 (2)
ISSN
2195-1071
Publisher
Wiley-VCH GmbH
Journal / Book Title
Advanced Optical Materials
Volume
10
Issue
2
Copyright Statement
© 2021 The Authors. Advanced Optical Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
License URL
Sponsor
Commission of the European Communities
Identifier
https://www.webofscience.com/wos/woscc/full-record/WOS:000713872200001
Grant Number
742708
Subjects
chiral materials
chiroptical response
circularly polarized light
DICHROISM
ELECTROLUMINESCENCE
LIGHT
Materials Science
Materials Science, Multidisciplinary
Optics
organic photodiodes
photodetectors
Physical Sciences
Science & Technology
Technology
Publication Status
Published
Article Number
ARTN 2101044
Date Publish Online
2021-11-02