期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 1, 页码 989-996出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b14772
关键词
all-inorganic perovskite; X-ray detector; cesium lead bromide; rubidium doping; carrier transport
资金
- Hunan Provincial Science and Technology Department
- research fund for the central universities
- National Natural Science Foundation of China [51872082, 51525202, 61574054, 51702107]
The direct band gap CsPbBr3 perovskite is regarded as a promising alternative for low-cost and high-performance X-ray radiation detectors. Despite the fact that CsPbBr3 nanocrystals have been shown to be good scintillators in the indirect conversion mode, the direct X-ray conversion with CsPbBr3 single crystals is expected to yield higher spatial resolution. Here, rubidium (Rb) doping is demonstrated to be an efficient approach to improve carrier transport and X-ray detection performance in the direct-conversion X-ray detectors based on Cs(1-x)RbxPbBr3 single crystals. Electrical properties' characterizations as combined with X-ray photoelectron spectroscopy (XPS) measurements have revealed that Rb doping in Cs(1-x)RbxPbBr3 single crystals can enhance the atomic interaction and orbital coupling between Pb and Br atoms, leading to an enhancement of carrier transport and X-ray detection performance. X-ray detectors based on a small amount (0.037%) of Rb-doped Cs(1-x)RbxPbBr3 single crystals exhibited a high X-ray sensitivity of 8097 mu C Gy(air)(-1) cm(.)(-2) This work offers a feasible strategy to improve the X-ray detection performance by chemical doping in all-inorganic perovskite X-ray detectors.
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