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 |
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Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 0741-3106 1558-0563 |
DOI: | 10.1109/LED.2022.3202173 |