Rubidium Doping to Enhance Carrier Transport in CsPbBr3 Single Crystals for High-Performance X-Ray Detection
Rubidium Doping to Enhance Carrier Transport in CsPbBr3 Single Crystals for High-Performance X-Ray Detection
复制标题
高性能X射线探测用CsPbBr3单晶中铷掺杂增强载流子输运
DOI：
10.1021/acsami.9b14772
复制
发表时间：
2020-01-08
影响因子：
9.5
通讯作者：
Yang, Bin
中科院分区：
文献类型：
--
作者：
Li, Junchi;Du, Xinyuan;Yang, Bin
直接带隙CsPbBr 3钙钛矿被认为是低成本和高性能X射线辐射探测器的有前途的替代品。尽管CsPbBr 3纳米晶体在间接转换模式中被证明是良好的散射体，但使用CsPbBr 3单晶的直接X射线转换预计会产生更高的空间分辨率。在基于Cs（1-x）RbxPbBr 3单晶的直接转换X射线探测器中，铷（Rb）掺杂被证明是改善载流子输运和X射线探测性能的有效途径。结合X射线光电子能谱（XPS）测量的电学性质表明，Rb掺杂Cs（1-x）RbxPbBr 3单晶可以增强Pb和Br原子之间的相互作用和轨道耦合，从而提高载流子输运和X射线探测性能。基于少量（0.037%）掺Rb的Cs（1-x）RbxPbBr_3单晶的X射线探测器表现出8097 μ C戈伊（空气）~（-1）cm ~（.）(-2)该工作为全无机钙钛矿X射线探测器的化学掺杂提供了一种可行的策略。
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.