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Oriented Heterodimensional Perovskite Crystals for Self‐Powered X‐Ray Detection with Reduced Dark Current and Anisotropic Response

X‐ray detectors utilizing 2D/3D heterodimensional perovskites have achieved great success. However, the labile nature of halide perovskites generally results in structures with random orientations and interfaces, which in turn increases the dark noise of X‐ray detectors, hindering their use in low‐d...

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Published in:Advanced functional materials 2024-04, Vol.34 (14), p.n/a
Main Authors: Zhang, Xinyuan, Song, Xin, Abulikemu, Mutalifu, Shao, Bingyao, Chen, Shulin, Gutiérrez‐Arzaluz, Luis, Si, Gaoshoutong, Ahmad, Taimoor, Wu, Wentao, Mohammed, Omar F., Bakr, Osman M.
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cited_by cdi_FETCH-LOGICAL-c3171-c630f23c625b7fb68bab655899124d3ef849a5fa2c9f8ae23101652f23e122513
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container_issue 14
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container_title Advanced functional materials
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creator Zhang, Xinyuan
Song, Xin
Abulikemu, Mutalifu
Shao, Bingyao
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Si, Gaoshoutong
Ahmad, Taimoor
Wu, Wentao
Mohammed, Omar F.
Bakr, Osman M.
description X‐ray detectors utilizing 2D/3D heterodimensional perovskites have achieved great success. However, the labile nature of halide perovskites generally results in structures with random orientations and interfaces, which in turn increases the dark noise of X‐ray detectors, hindering their use in low‐dose X‐ray detection. Here, it is shown that both anisotropy and ultralow dark current can be achieved in self‐powered X‐ray detectors using well‐oriented 2D/3D heterodimensional perovskite crystals (HPCs). A halide diffusion‐promoted welding approach is devised to create the oriented HPCs, enabling two distinct configurations: A lateral orientation where the inorganic frameworks of the two phases are perpendicular, and a vertical orientation with parallel inorganic slabs. The different crystalline orientations produce unique anisotropic X‐ray detecting performance of 2D/3D HPCs, with a large anisotropic ratio of 4. Moreover, a self‐powered X‐ray detector using vertical HPC exhibits a greatly suppressed dark current density of 0.17 nA cm−2 and a low detection limit of 77 nGyair s−1, enabling high‐resolution X‐ray imaging. In contrast, the lateral devices show higher X‐ray sensitivity (1850 µC Gyair−1cm−2) at zero bias. This work reveals the interplay between crystalline orientation and X‐ray detection performance, opening new possibilities for developing low‐cost, low‐noise X‐ray detectors. A facile epitaxial welding method has been proposed here for creating large‐sized heterodimensional perovskite crystals (HPCs) with controlled orientation to demonstrate self‐powered X‐ray detection. The vertical HPC device exhibits a suppressed dark current of 0.17 nA cm−2 and a low detection limit of 77 nGyair s−1. In contrast, the lateral devices show higher X‐ray sensitivity at zero bias.
doi_str_mv 10.1002/adfm.202312871
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However, the labile nature of halide perovskites generally results in structures with random orientations and interfaces, which in turn increases the dark noise of X‐ray detectors, hindering their use in low‐dose X‐ray detection. Here, it is shown that both anisotropy and ultralow dark current can be achieved in self‐powered X‐ray detectors using well‐oriented 2D/3D heterodimensional perovskite crystals (HPCs). A halide diffusion‐promoted welding approach is devised to create the oriented HPCs, enabling two distinct configurations: A lateral orientation where the inorganic frameworks of the two phases are perpendicular, and a vertical orientation with parallel inorganic slabs. The different crystalline orientations produce unique anisotropic X‐ray detecting performance of 2D/3D HPCs, with a large anisotropic ratio of 4. Moreover, a self‐powered X‐ray detector using vertical HPC exhibits a greatly suppressed dark current density of 0.17 nA cm−2 and a low detection limit of 77 nGyair s−1, enabling high‐resolution X‐ray imaging. In contrast, the lateral devices show higher X‐ray sensitivity (1850 µC Gyair−1cm−2) at zero bias. This work reveals the interplay between crystalline orientation and X‐ray detection performance, opening new possibilities for developing low‐cost, low‐noise X‐ray detectors. A facile epitaxial welding method has been proposed here for creating large‐sized heterodimensional perovskite crystals (HPCs) with controlled orientation to demonstrate self‐powered X‐ray detection. The vertical HPC device exhibits a suppressed dark current of 0.17 nA cm−2 and a low detection limit of 77 nGyair s−1. 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subjects anisotropic response
Anisotropy
Dark current
dark currents
Detectors
oriented heterodimensional perovskites
Perovskites
Sensors
Vertical orientation
welding
X‐ray detection
title Oriented Heterodimensional Perovskite Crystals for Self‐Powered X‐Ray Detection with Reduced Dark Current and Anisotropic Response
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