Ferroelectricity‐Driven Self‐Powered Ultraviolet Photodetection with Strong Polarization Sensitivity in a Two‐Dimensional Halide Hybrid Perovskite

Polarization‐sensitive ultraviolet (UV) photodetection is highly indispensable in military and civilian applications and has been demonstrated with various wide‐band photodetectors. However, it still remains elusive to achieve the self‐powered devices, which can be operated in the absence of externa...

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Published inAngewandte Chemie International Edition Vol. 59; no. 43; pp. 18933 - 18937
Main Authors Ji, Chengmin, Dey, Dhananjay, Peng, Yu, Liu, Xitao, Li, Lina, Luo, Junhua
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 19.10.2020
EditionInternational ed. in English
Subjects
bulk photovoltaic effect
Ferroelectricity
ferroelectrics
hybrid perovskites
Linear polarization
Military applications
Perovskites
Photometers
Photovoltaic effect
Photovoltaics
Polarization
polarization sensitivity
self-powered photodetection
Sensitivity
Ultraviolet radiation
Zinc oxide
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Summary:Polarization‐sensitive ultraviolet (UV) photodetection is highly indispensable in military and civilian applications and has been demonstrated with various wide‐band photodetectors. However, it still remains elusive to achieve the self‐powered devices, which can be operated in the absence of external bias. Herein, for the first time, ferroelectricity‐driven self‐powered photodetection towards polarized UV light was successfully demonstrated in a 2D wide‐band gap hybrid ferroelectric (BPA)2PbBr4 (BPA=3‐bromopropylammonium) (1). We found that the prominent spontaneous polarization in 1 results in a bulk photovoltaic effect (BPVE) of 0.85 V, that independently drives photoexcited carriers separation and transport and thus supports self‐powered ability. This self‐powered detector shows strong polarization sensitivity to linearly polarized UV illumination with a polarization ratio up to 6.8, which is superior to that of previously reported UV‐polarized photodetectors (ZnO, GaN, and GeS2). A ferroelectricity‐driven self‐powered ultraviolet photodetector employing a 2D hybrid perovskite ferroelectric (BPA)2PbBr4 (BPA=3‐bromopropylammonium) is presented. It shows strong polarization sensitivity, with a large polarization ratio of up to 6.8.
Bibliography:These authors contributed equally to this work.
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ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.202005092