用于恶劣环境中高灵敏度 X 射线检测和高分辨率成像的高质量 0D Cs4PbBr6 基致密晶圆,Advanced Optical Materials

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用于恶劣环境中高灵敏度 X 射线检测和高分辨率成像的高质量 0D Cs4PbBr6 基致密晶圆
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2022-10-31 , DOI: 10.1002/adom.202202157
Huanyu Chen ₁ , Baoyi An ₁ , Guoqiang Peng ₁ , Shuo Wang ₁ , ZhenHua Li ₂ , Jie Sun ₃ , Wei Lan ₁ , Jiajia Fu ₄ , Haoxu Wang ₁ , Liming Ding ₅ , Zhiwen Jin ₁

Affiliation

金属卤化物的使用促进了 X 射线检测器 (XD) 的发展，因为它们具有出色的 X 射线吸光度、电良性缺陷和较大的迁移率-寿命 ( µτ ) 乘积。然而严重的基线漂移、尺寸限制、大暗电流和中等稳定性仍有待解决。在此，首次采用热等静压法构建了高密度尺寸可缩放 Cs ₄ PbBr _{6晶圆基 XD。}同时，实现了基于不同Br ^-空位（V _Br）浓度的Cs ₄ PbBr ₆。V _Br的作用密度泛函理论和实验测量突出了电气结构和电荷传输方面的研究。此外，进一步的研究指出，0D结构赋予Cs ₄ PbBr ₆高离子传输活化能（1044 meV）和带隙（3.88 eV），最终导致超稳定的基线和热稳定性。基于高效响应（7068 µC Gy _air⁻¹ cm ⁻²）、可靠的电流输出、超低检测限（1.75 nGy _air s ⁻¹）、高空间分辨率（5.2 lp mm ⁻¹在调制传递函数 = 0.2), 快速的响应速度和辐射稳定性 (>1000 Gy _air)，在单像素和线性扫描模式下实现了宽能量范围（20-160 keV）下的高分辨率X射线图像，因此在医学诊断、安全检查和外层空间探测方面具有巨大潜力。

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High-Quality 0D Cs4PbBr6-Based Dense Wafer for High-Sensitivity X-Ray Detection and High-Resolution Imaging in Harsh Environment

The use of metal halides promotes the development of X-ray detectors (XDs) owing to their excellent X-ray absorbance, electrically benign defects, and large mobility−lifetime (µτ) product. Yet the severe baseline drift, size limitation, large dark current, and mediocre stability are still waiting to be solved. Herein, high density size-scalable Cs₄PbBr₆ wafer-based XD is constructed by the hot isostatic-pressed method for the first time. Meanwhile, different Br⁻ vacancy (V_Br) concentration-based Cs₄PbBr₆ is realized. The role of V_Br in electrical structure and charge transport is highlighted by density functional theory and experimental measurement. Moreover, the further study points the 0D structure endows Cs₄PbBr₆ with high activation energy for ionic transport (1044 meV) and bandgap (3.88 eV), which finally results in an ultra-stable baseline and thermal stability. On the basis of efficient response (7068 µC Gy_air⁻¹ cm⁻²), reliable current output, ultra-low detection limit (1.75 nGy_air s⁻¹), high spatial resolution (5.2 lp mm⁻¹ at modulation transfer function = 0.2), fast response speed and radiation stabilities (>1000 Gy_air), the high-resolution X-ray images under broad energy range (20–160 keV) are realized on both single-pixel and linear scanning mode, thus holding huge potential for medical diagnosis, safety inspection, and outer space detection.

更新日期：2022-10-31

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