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High Responsivity Circular Polarized Light Detectors based on Quasi Two-Dimensional Chiral Perovskite Films



Liu, T;

Shi, W;

Tang, W;

Liu, Z;

Schroeder, BC;

Fenwick, O;

Fuchter, MJ;

(2022)

High Responsivity Circular Polarized Light Detectors based on Quasi Two-Dimensional Chiral Perovskite Films.

ACS Nano
, 16
(2)

pp. 2682-2689.

10.1021/acsnano.1c09521.


Text

Manuscript ACSNano revised clean.pdf
– Accepted Version

Access restricted to UCL open access staff until 23 February 2023.

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Abstract

Circularly polarized light (CPL) has considerable technological potential, from quantum computing to bioimaging. To maximize the opportunity, high performance photodetectors that can directly distinguish left-handed and right-handed circularly polarized light are needed. Hybrid organic-inorganic perovskites containing chiral organic ligands are an emerging candidate for the active material in CPL photodetecting devices, but current studies suggest there to be a trade-off between the ability to differentially absorb CPL and photocurrent responsivity in chiral perovskites devices. Here, we report a CPL detector based on quasi two-dimensional (quasi-2D) chiral perovskite films. We find it is possible to generate materials where the circular dichroism (CD) is comparable in both 2D and quasi-2D films, while the responsivity of the photodetector improves for the latter. Given this, we are able to showcase a CPL photodetector that exhibits both a high dissymmetry factor of 0.15 and a high responsivity of 15.7 A W-1. We believe our data further advocates the potential of chiral perovskites in CPL-dependent photonic technologies.

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