来自分段 STEM 探测器的氮化镓原子电场：实验与模拟

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-02-19 DOI:10.1111/jmi.13276

Tim Grieb, Florian F. Krause, Thorsten Mehrtens, Christoph Mahr, Beeke Gerken, Marco Schowalter, Bert Freitag, Andreas Rosenauer

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引用次数: 0

摘要

利用 Spectra 300 显微镜中的 12 段 STEM 探测器，在 4D 扫描透射电子显微镜（4D-STEM）中采用质量中心法测量了氮化镓薄样品中的原子电场。电场、电荷密度和电势与使用像素化 4D-STEM 探测器进行的模拟和实验测量结果进行了比较。分段探测器具有记录速度快的优点，可以在低辐射剂量下进行测量。不过，由于本研究分析的分段数量有限，因此存在测量不确定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

GaN atomic electric fields from a segmented STEM detector: Experiment and simulation

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GaN atomic electric fields from a segmented STEM detector: Experiment and simulation

Atomic electric fields in a thin GaN sample are measured with the centre-of-mass approach in 4D-scanning transmission electron microscopy (4D-STEM) using a 12-segmented STEM detector in a Spectra 300 microscope. The electric fields, charge density and potential are compared to simulations and an experimental measurement using a pixelated 4D-STEM detector. The segmented detector benefits from a high recording speed, which enables measurements at low radiation doses. However, there is measurement uncertainty due to the limited number of segments analysed in this study.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.