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Rubidium Doping to Enhance Carrier Transport in CsPbBr3 Single Crystals for High-Performance X-Ray Detection.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-12-20 , DOI: 10.1021/acsami.9b14772 Junchi Li , Xinyuan Du 1 , Guangda Niu 1 , Haipeng Xie 2 , Yifu Chen 2 , Yongbo Yuan 2 , Yongli Gao 3 , Hanning Xiao , Jiang Tang 1 , Anlian Pan , Bin Yang
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-12-20 , DOI: 10.1021/acsami.9b14772 Junchi Li , Xinyuan Du 1 , Guangda Niu 1 , Haipeng Xie 2 , Yifu Chen 2 , Yongbo Yuan 2 , Yongli Gao 3 , Hanning Xiao , Jiang Tang 1 , Anlian Pan , Bin Yang
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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 μC Gyair-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.
中文翻译：
High掺杂可增强CsPbBr3单晶中的载流子传输，从而实现高性能X射线检测。
直接带隙CsPbBr3钙钛矿被认为是低成本和高性能X射线辐射探测器的有希望的替代品。尽管事实证明CsPbBr3纳米晶体在间接转换模式下是良好的闪烁体，但使用CsPbBr3单晶进行的直接X射线转换有望产生更高的空间分辨率。在这里，rub（Rb）掺杂被证明是在基于Cs（1-x）RbxPbBr3单晶的直接转换X射线检测器中提高载流子传输和X射线检测性能的有效方法。结合X射线光电子能谱（XPS）测量的电性能表征表明，Cs（1-x）RbxPbBr3单晶中的Rb掺杂可以增强Pb和Br原子之间的原子相互作用和轨道耦合，导致载流子传输和X射线检测性能的增强。基于少量（0.037％）掺Rb的Cs（1-x）RbxPbBr3单晶的X射线探测器表现出8097μCGyair-1 cm-2的高X射线灵敏度。这项工作提供了一种可行的策略，可以通过在全无机钙钛矿X射线检测器中进行化学掺杂来提高X射线检测性能。
更新日期：2019-12-21
中文翻译：
High掺杂可增强CsPbBr3单晶中的载流子传输，从而实现高性能X射线检测。
直接带隙CsPbBr3钙钛矿被认为是低成本和高性能X射线辐射探测器的有希望的替代品。尽管事实证明CsPbBr3纳米晶体在间接转换模式下是良好的闪烁体，但使用CsPbBr3单晶进行的直接X射线转换有望产生更高的空间分辨率。在这里，rub（Rb）掺杂被证明是在基于Cs（1-x）RbxPbBr3单晶的直接转换X射线检测器中提高载流子传输和X射线检测性能的有效方法。结合X射线光电子能谱（XPS）测量的电性能表征表明，Cs（1-x）RbxPbBr3单晶中的Rb掺杂可以增强Pb和Br原子之间的原子相互作用和轨道耦合，导致载流子传输和X射线检测性能的增强。基于少量（0.037％）掺Rb的Cs（1-x）RbxPbBr3单晶的X射线探测器表现出8097μCGyair-1 cm-2的高X射线灵敏度。这项工作提供了一种可行的策略，可以通过在全无机钙钛矿X射线检测器中进行化学掺杂来提高X射线检测性能。
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