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在测量晶体样本中的远程电场时,光束大小和衍射效应的影响通过4DSTEM测量

Damien Heimes¹, Varun Shankar Chejarla¹, Shamail Ahmed¹

¹Material Sciences Center and Department of Physics, Philipps-Universität Marburg, Germany.

Ultramicroscopy

|August 10, 2023

概括

研究人员探索了在GaAs p-n 连接处使用4DSTEM测量电场. 他们发现,由于重叠的衍射盘,中间的半融合角度范围阻止了准确的内置电位 (Vbi) 测量.

科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
电子显微镜电子显微镜

背景情况:

电场测量方面正在出现4DSTEM.
量化4DSTEM测量,特别是内置潜力 (Vbi),需要进一步了解.
GaAs p-n 连接作为这些研究的模型系统.

研究的目的:

使用4DSTEM研究半合角对GaAs p-n连接处Vbi测量的影响.
确定最佳的实验条件,以准确确定Vbi.
阐明Vbi测量与电场强度测量的局限性和优点.

主要方法:

在GaAs p-n连接处使用质量中心 (COM) 方法的实验4DSTEM.
STEM多切片模拟包括原子和纳米尺度的电场.
对衍射盘重叠和强度变化的分析与半收角 (α).

主要成果:

确定了三种不同的α范围用于Vbi测量.
一个中间的α范围,其中衍射盘重叠不折射光束,使Vbi测量不可行.
模拟表明,与电场强度相比,Vbi测量对光束大小和样品厚度的敏感性较小.

结论:

在4DSTEM中测量Vbi的可行性严重依赖于半融合角度.
了解衍射盘的行为是克服电场测量的局限性的关键.
测量Vbi提供了一种更强大的方法来表征材料中的电潜.

关键词:

4DSTEM是什么意思电场是一个电场.远程电场是远程的电场.多个切片的多个切片.这是一个潜在的潜力.在 p-n 交叉点上.

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