缓解寄生和漂移容量诱导的非线性电流响应,用于稳定和敏感的矿X射线探测器
Ziyao Zhu1,2, Bo Zhao1, Rui He1
1Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
ACS applied materials & interfaces
|July 15, 2024
概括
矿X射线探测器通过解决非线性电流响应来实现高灵敏度和线性. 这一突破增强了医疗成像和工业检查,提高了X射线检测性能.
科学领域:
- 材料科学 材料科学 材料科学
- 物理 物理学 物理
- 医学成像技术 医学成像技术
背景情况:
- 矿材料对于推进直接X射线探测器至关重要,对于医学成像和工业检查至关重要.
- 最佳的X射线能量转换需要厚厚的矿石 (数百微米到毫米),但这导致非线性电流反应.
- 现有的关于浅层缺陷的电荷捕获理论不能完全解释高质量的矿样本中观察到的非线性.
研究的目的:
- 为了阐明厚矿X射线探测器中非线性电流响应的原因.
- 开发策略来抑制这些非线性,并提高探测器性能.
- 展示这些策略在高分辨率X射线成像应用中的潜力.
主要方法:
- 研究的寄生和漂移电容诱导的非线性电流响应.
- 分析了批量结构缺陷和接口连接点宽度变化的影响.
- 采用理论分析和实验验证.
- 开发了大量的异质连接和精细的接口连接,以抑制非线性.
主要成果:
- 确定了批量结构缺陷和接口接口宽度变化作为非线性电流响应的关键贡献者,以及浅层缺陷.
- 通过批量异质连接和精细接口连接,有效抑制非线性电流响应.
- 开发了使用多晶MAPbI3厚膜的高线性电流响应矿探测器.
- 在100kVp时达到2.3×10^4μC·Gy_air^-1·cm^-2的记录灵敏度,偏差低 (0.1V/μm).
- 制造并测试了一种64 × 64像素的原型探测器.
结论:
- 开发的矿探测器表现出卓越的线性,并且在X射线检测方面具有非常高的灵敏度.
- 建立大量异质连接和精炼接口连接的策略在缓解非线性电流响应方面是有效的.
- 这些进步使得持久的,高分辨率的X射线成像成为可能,特别是对于高密度的物体.
- 这些发现证实了这些策略的广泛适用性,用于改进基于矿的X射线探测器.
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