Self-Healing Cs3Bi2Br3I6 Perovskite Wafers for X-Ray Detection

被引:36
作者
Daum, Manuel [1 ]
Deumel, Sarah [1 ,2 ]
Sytnyk, Mykhailo [1 ]
Afify, Hany A. [1 ]
Hock, Rainer [3 ]
Eigen, Andreas [4 ]
Zhao, Baolin [4 ]
Halik, Marus [4 ]
These, Albert [5 ]
Matt, Gebhard J. [5 ]
Brabec, Christoph J. [5 ,6 ]
Tedde, Sandro F. [2 ]
Heiss, Wolfgang [1 ]
机构
[1] Friedrich Alexander Univ Erlangen Nurnberg, Inst Mat Elect & Energy Technol I MEET, Dept Mat Sci & Engn, Energy Campus Nurnberg,Furtherstr 250, D-90429 Nurnberg, Germany
[2] Siemens HealthineersAG, Technol Excellence, Guenther Scharowsky Str 1, D-91058 Erlangen, Germany
[3] Friedrich Alexander Univ Erlangen Nuremberg, Inst Crystallog & Struct Phys ICPS, Phys Dept, Staudtstr 3, D-91058 Erlangen, Germany
[4] Friedrich Alexander Univ Erlangen Nurnberg, Organ Mat & Devices OMD, Inst Polymer Mat Interdisziplinares Zentrum Nanos, Cauerstr 3, D-91058 Erlangen, Germany
[5] Friedrich Alexander Univ Erlangen Nurnberg, Inst Mat Elect & Energy Technol, Dept Mat Sci & Engn, Martensstr 7, D-91058 Erlangen, Germany
[6] Helmholtz Inst Erlangen Nurnberg, Immerwahrstr 2, D-91058 Erlangen, Germany
关键词
bismuth halides; lead-free perovskites; photoconductors; self-healing; X-ray detection; FILMS; PERFORMANCE; EXPANSION; CS3BI2I9; OXIDE;
D O I
10.1002/adfm.202102713
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Self-healing of defects imposed by external stimuli such as high energy radiation is a possibility to sustain the operational lifetime of electronic devices such as radiation detectors. Cs3Bi2Br3I6 polycrystalline wafers are introduced here as novel X-ray detector material, which not only guarantees a high X-ray stopping power due to its composition with elements with high atomic numbers, but also outperforms other Bi-based semiconductors in respect to detector parameters such as detection limit, transient behavior, or dark current. The polycrystalline wafers represent a size scalable technology suitable for future integration in imager devices for medical applications. Most astonishingly, aging of these wafer-based devices results in an overall improvement of the detector performance-dark currents are reduced, photocurrents are increased, and one of the most problematic properties of X-ray detectors, the base line drift is reduced by orders of magnitude. These aging induced improvements indicate self-healing effects which are shown to result from recrystallization. Optimized synthetic conditions also improve the as prepared X-ray detectors; however, the aged device outperforms all others. Thus, self-healing acts in Cs3Bi2Br3I6 as an optimization tool, which is certainly not restricted to this single compound, it is expected to be beneficial also for many further polycrystalline ionic semiconductors.
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页数:10
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