Asymmetric Metal Halide Film With Suppressed Leakage Current for High Sensitive X-Ray Detection and Imaging

Metal halides have been demonstrated to be promising candidates for X-ray detectors. However, its large leakage current caused by the severe ion migration and intrinsic defect substantially degrades device performance. In this work, an asymmetric BA2CsPb2I7-CsPbI3 planar heterojunction X-ray detecto...

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Veröffentlicht in:IEEE electron device letters 2022-10, Vol.43 (10), p.1709-1712
Hauptverfasser: Xu, Youkui, Li, Yingtao, Peng, Guoqiang, Wang, Qian, Li, Zhenhua, Wang, Haoxu, Wang, Gang, Jin, Zhiwen
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container_issue 10
container_start_page 1709
container_title IEEE electron device letters
container_volume 43
creator Xu, Youkui
Li, Yingtao
Peng, Guoqiang
Wang, Qian
Li, Zhenhua
Wang, Haoxu
Wang, Gang
Jin, Zhiwen
description Metal halides have been demonstrated to be promising candidates for X-ray detectors. However, its large leakage current caused by the severe ion migration and intrinsic defect substantially degrades device performance. In this work, an asymmetric BA2CsPb2I7-CsPbI3 planar heterojunction X-ray detector is designed to suppress the leakage current. Both experimental and theoretical calculations demonstrate that: 1) enlarged ion migration energy (0.80 eV) and conductivity mutation at the interface ensure stable baseline and suppress leakage current; 2) CsPbI3 ensures effective absorption of X-ray, while BA2CsPb2I7 induces larger bulk resistance, which is expected to achieve higher photocurrent and lower dark current. Finally, the obtained X-ray detector exhibits negligible baseline drift, faster response, and smaller leakage current compared to the CsPbI3 counterparts. Specifically, the device exhibits a detection limit of 0.092 ~\mu Gy _{air} /s, and the CsPbI3-based device was 2.63 ~\mu Gy _{air} /s.
doi_str_mv 10.1109/LED.2022.3202173
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However, its large leakage current caused by the severe ion migration and intrinsic defect substantially degrades device performance. In this work, an asymmetric BA2CsPb2I7-CsPbI3 planar heterojunction X-ray detector is designed to suppress the leakage current. Both experimental and theoretical calculations demonstrate that: 1) enlarged ion migration energy (0.80 eV) and conductivity mutation at the interface ensure stable baseline and suppress leakage current; 2) CsPbI3 ensures effective absorption of X-ray, while BA2CsPb2I7 induces larger bulk resistance, which is expected to achieve higher photocurrent and lower dark current. Finally, the obtained X-ray detector exhibits negligible baseline drift, faster response, and smaller leakage current compared to the CsPbI3 counterparts. 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subjects Asymmetric
Asymmetry
Dark current
Halides
Heterojunctions
imaging
Ion migration
Ions
Lattices
Leakage current
Leakage currents
metal halide
Metal halides
Mutation
Performance degradation
Photoelectric effect
Voltage
X ray detectors
X ray imagery
X-ray detection
X-ray imaging
title Asymmetric Metal Halide Film With Suppressed Leakage Current for High Sensitive X-Ray Detection and Imaging
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