Mixed‐Cation MAxCs1−xPbBr3 Perovskite Single Crystals with Composition Management for High‐Sensitivity X‐Ray Detection,Physica Status Solidi-Rapid Research Letters

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Mixed‐Cation MAxCs1−xPbBr3 Perovskite Single Crystals with Composition Management for High‐Sensitivity X‐Ray Detection
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-07-11 , DOI: 10.1002/pssr.202000226
Zhengfang Fan ₁ , Jiang Liu ₁ , Wentao Zuo ₁ , Guoqiang Liu ₁ , Xulin He ₁ , Kun Luo ₁ , Qinyan Ye ₁ , Cheng Liao ₁

Affiliation

High‐sensitivity X‐ray detection is widely applied in medical imaging, environmental monitoring, and scientific research. Perovskite single crystals have been demonstrated to be a kind of potential material in X‐ray detection because of their large X‐ray attenuation coefficient, low crystal growth cost, and excellent photoelectric properties. In this study, a successful method to grow mixed‐cation MA_xCs_1−xPbBr₃ single crystals with the assistance of an antisolvent and a highly sensitive X‐ray detector with symmetrical sandwich structure is reported. The analysis of absorption spectra of these crystals indicates the bandgap is tunable from 2.25 to 2.16 eV with increasing methylammonium (MA) compositions. Through the space‐charge‐limited current measurement, these mixed‐cation crystals achieve significantly improved electronic properties involving trap density, mobility, and conductivity, compared with the MAPbBr₃ and CsPbBr₃ crystals. The optimized electronic properties enable a high‐sensitivity X‐ray detector and a systematical analysis of crystal composition and detection performance. The X‐ray detectors based on mixed‐cation crystals exhibit a higher sensitivity and lower detection limit. The MA_0.6Cs_0.4PbBr₃‐based detector achieves a sensitivity of up to 2017 μC Gy_air⁻¹ cm⁻² and a detection limit of 1.2 μGy_air s⁻¹ under an applied voltage of 1 V, which is much better than our prepared MAPbBr₃‐ and CsPbBr₃‐based detectors.

中文翻译：

具有成分管理功能的混合阳离子MAxCs1-xPbBr3钙钛矿单晶，用于高灵敏度X射线检测

高灵敏度X射线检测已广泛应用于医学成像，环境监测和科学研究。钙钛矿单晶由于具有大的X射线衰减系数，低的晶体生长成本和出色的光电性能，已被证明是X射线检测中的一种潜在材料。在这项研究中，一种成功的生长混合阳离子MA _x Cs _{1− x} PbBr _3的方法据报道，在抗溶剂和具有对称夹层结构的高灵敏度X射线检测器的帮助下形成单晶。对这些晶体的吸收光谱的分析表明，随着甲基铵（MA）组成的增加，带隙在2.25至2.16 eV之间可调。通过空间电荷限制电流测量，与MAPbBr ₃和CsPbBr ₃相比，这些混合阳离子晶体实现了电子性能的显着改善，包括陷阱密度，迁移率和电导率晶体。优化的电子性能可实现高灵敏度的X射线检测器，以及对晶体组成和检测性能的系统分析。基于混合阳离子晶体的X射线检测器具有更高的灵敏度和更低的检测限。基于MA _0.6 Cs _0.4 PbBr ₃的检测器在施加1 V电压时可实现高达2017μCGy_空气^-1 cm ^-2的灵敏度和1.2μGy_空气 s ^-1的检测极限。准备了基于MAPbBr ₃和CsPbBr ₃的检测器。

更新日期：2020-07-11

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