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在胺矿单晶中识别和抑制点缺陷,使得玛射线光谱学成为可能

Zhenyi Ni¹, Liang Zhao¹, Zhifang Shi¹

¹Department of Applied Physical Sciences, University of North Carolina, Chapel Hill, NC, 27599, USA.

Advanced materials (Deerfield Beach, Fla.)

|July 14, 2024

概括

研究人员确定了甲基三化物 (MAPbBr) 晶体的关键缺陷,这对于开发室温马射线探测器至关重要. 通过减少这些缺陷来优化晶体生长,显著提高了探测器性能和能量分辨率.

科学领域:

材料科学材料科学材料科学
固态物理固态物理
核仪器仪表核仪器仪表核仪器仪表

背景情况:

甲基三化物 (MAPbBr₃) 是用于室温马射线探测器的有希望的宽带间隙矿.
缺乏对点缺陷的理解,阻碍了基于MAPbBr₃的设备的实现.

研究的目的:

在MAPbBr₃晶体中识别主导点缺陷.
为了将这些缺陷与探测器性能相关联.
为了提高MAPbBr的玛射线检测能力.

主要方法:

水晶生长设计和优化.
阳子灭绝光谱学. 阳子灭绝光谱学.
阻抗光谱学.阻抗光谱学.阻抗光谱学.
马射线光谱学. 马射线光谱学.

主要成果:

确定了甲基 (MA) 空缺,MA间隙和Pb空缺作为主要的电荷捕获缺陷.
确定了 Br 职位空缺作为兴奋剂缺陷.
添加多余的MABr和formamidinium (FA) 离子可以减少有害缺陷.
在662 keV¹³⁷Cs线上实现了3.9%的能量分辨率,偏差为100 V.

结论:

对高性能MAPbBr马射线探测器来说,点缺陷控制至关重要.
优化的晶体生长策略可以显著提高探测器的能力.
这项工作为改进基于矿的宽带差距辐射检测设备铺平了道路.

关键词:

缺陷缺陷缺陷缺陷缺陷马射线探测器的马射线探测器矿是一种单晶的矿.

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