期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 24, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201910648
关键词
2D; A; B-3; X-2; (9) perovskite derivatives; structural descriptors; X-ray detectors
类别
资金
- National Key R&D Program of China [2018YFA0703200, 2016YFA0204000]
- National Natural Science Foundation of China [51702107, 61905082]
- China Postdoctoral Science Foundation [2018M642827]
Metal halide perovskites and derivatives exhibit a high sensitivity and low detection limit as direct X-ray detectors. Inorganic 2D bismuth halide perovskites are promising for X-ray detections, but have not been reported. Moreover, the quantitative relationship between the structural dimensionality of A(3)B(2)X(9) perovskites and their compositions has never been investigated, and the underlying mechanism is unclear. Here, the key structural descriptors for 2D A(3)B(2)X(9) perovskite derivatives are reported: i) octahedral factor mu, 0.377 < mu < 0895; ii) tolerance factor t, 0.8 < t < 1.06; iii) (r(A)-0.55)/t < 1.48 angstrom. Accordingly, a new 2D A(3)B(2)X(9) perovskite derivative, Rb3Bi2I9, with high X-ray attenuation coefficients is found. The assembled X-ray detector exhibits a high mu tau product of 2.51 x 10(-3) cm(2) V-1, good sensitivity for 159.7 mu C Gy(air)(-1) cm(-2), and a record low detection limit of 8.32 nGy(air) s(-1) among all direct and indirect perovskite X-ray detectors. The device also exhibits good stability toward external bias and continuous gamma ray radiations (480 000 Gy). This work provides crystal structural insights to rationally design 2D perovskites for new types of radiation detectors.
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