Spin‐Selective Charge Transport in Lead‐Free Chiral Perovskites: The Key towards High‐Anisotropy in Circularly‐Polarized Light Detection

A pair of zero‐dimensional lead‐free chiral perovskites is introduced towards the detection of circularly polarized light (CPL). Although spin‐polarized carriers are generated in the perovskites under the CPL, the absorption anisotropy remained low leading to mostly similar density of photogenerated...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2022-12, Vol.61 (52), p.e202214161-n/a
Main Authors: Maiti, Abhishek, Pal, Amlan J.
Format: Article
Language:English
Subjects:
Anisotropy
Carrier density
Charge transport
Chirality
Circular polarization
Circularly Polarized Light (CPL)
Detection
Diffusion length
Heterojunction devices
Perovskites
Photoelectric effect
Photovoltaic effect
Photovoltaics
Polarized light
Selectivity
Spin-Photovoltaic Effect
Spin-Polarization
Spin-Selectivity
Transport processes
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Summary:A pair of zero‐dimensional lead‐free chiral perovskites is introduced towards the detection of circularly polarized light (CPL). Although spin‐polarized carriers are generated in the perovskites under the CPL, the absorption anisotropy remained low leading to mostly similar density of photogenerated carriers under the two CPLs. Interestingly, due to the intrinsic chirality in the perovskites, they exhibited chirality‐induced spin‐selectivity (CISS) allowing the transport of only one type of spin‐half states. A high anisotropy in photocurrent along the out‐of‐plane direction has therefore appeared resulting in a spin‐dependent photovoltaic effect in vertical heterojunction devices and making them suitable for CPL detection. While a self‐powered CPL detector showed a limited (but one of the highest to date) anisotropy factor of 0.3 due to possible spin‐flips during the transport process, the factor rose to 0.6 under bias prompting extension of the effective spin‐diffusion length. A pair of zero‐dimensional bismuth‐based chiral perovskites has been introduced for the detection of circularly polarized light. The lower dimensional perovskites exhibit high degree of chirality‐induced spin‐selectivity allowing the transport of one type of spin‐half state while blocking the other type resulting in an anisotropic current response of the photodetectors that can be used to detect the polarization state of CPL photons.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202214161