期刊
ADVANCED MATERIALS
卷 34, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202106562
关键词
120 keV X-ray detection; all-inorganic perovskite single crystals; high sensitivity; mixed-halide perovskites; X-ray imaging
类别
资金
- National Natural Science Foundation of China [51972194, 51602178, 51932004, 61975098]
- National Key Research and Development Program of China [2016YFB1102201]
- Program of Introducing Talents of Disciplines to Universities in China (111 Program) [BP2018013]
- State Key Laboratory of Solidification Processing in NWPU [SKLSP202019]
- Shandong Provincial Key Research and Development Program [2018GGX102003]
In this study, the electrical properties and X-ray detection performances of CsPbBr3-nIn single crystals were improved by doping iodine atoms. The resistivity of CsPbBr3-nIn single crystals increased, decreasing the detection limit and restraining the leak current. The CsPbBr3-nIn single crystals showed stable dark currents, achieving record sensitivity and low detection limit for X-ray detection.
The relatively low resistivity and severe ion migration in CsPbBr3 significantly degrade the performance of X-ray detectors due to their high detection limit and current drift. The electrical properties and X-ray detection performances of CsPbBr3-nIn single crystals are investigated by doping the iodine atoms into the melt-grown CsPbBr3. The resistivity of CsPbBr3-nIn single crystals increases from 3.6 x 10(9) (CsPbBr3) to 2.2 x 10(11) (CsPbBr2I) omega cm, restraining the leak current and decreasing the detection limit of the detector. Additionally, CsPbBr3-nIn single crystals exhibit stable dark currents, arising from their high ion migration activation energy. A record sensitivity of 6.3 x 104 mu C Gy(-1) cm(-2) (CsPbBr2.9I0.1) and a low detection limit of 54 nGy s(-1) (CsPbBr2I) are achieved by CsPbBr3-nIn single crystals for the 120 keV hard X-ray detection under a 5000 V cm(-1) electrical field. The CsPbBr2.9I0.1 detector shows a stable current response with a dark current density of 0.58 mu A cm(-2) for 30 days and clear imaging for 120 keV Xrays at ambient conditions. The effective iodine atom doping strategy makes the CsPbBr3-nIn single crystals promising for reproducible high-energy hard X-ray imaging systems.
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