解析扫描电子显微镜中的电子羽流
Resolving the Electron Plume within a Scanning Electron Microscope
AI总结：
本研究通过对标准扫描电子显微镜（SEM）进行简单改造，通过成像电子羽流解析二次电子的动量与能量信息，实现了对埋层掺杂区域的探测与亚表面能带弯曲的观测，拓展了SEM的多模态材料探测能力。
摘要：
扫描电子显微镜（SEM）是一项已有百年历史的技术，如今是纳米结构表面成像的通用方法。然而，大多数SEM探测器仅统计来自目标材料的二次电子数量，因此忽略了其中蕴含的丰富材料信息。本研究通过对标准SEM设备进行简单改造，通过直接对SEM电子束产生的电子羽流成像，解析了二次电子的动量和能量信息。借助这些光谱成像能力，我们的技术能够对典型硅p-n结的横向电场成像，还能区分不同掺杂区域，即便这些区域埋在SEM通常可探测的深度以下也能实现。有趣的是，该技术的亚表面灵敏度揭示了名义上钝化的半导体结构中出人意料的强表面能带弯曲，为复杂层状元件设计提供了有用见解——这类设计中界面动力学决定了器件的运行。这些对复杂电子元件进行非侵入式多模态探测的能力在当今电子制造中至关重要，但即便采用先进技术也大多难以实现。这些结果表明，看似简单的SEM可被拓展用于探测复杂且实用的材料特性。
英文摘要：
Scanning electron microscopy (SEM), a century-old technique, is today a ubiquitous method of imaging the surface of nanostructures. However, most SEM detectors simply count the number of secondary electrons from a material of interest, and thereby overlook the rich material information contained within them. Here, by simple modifications to a standard SEM tool, we resolve the momentum and energy information of secondary electrons by directly imaging the electron plume generated by the electron beam of the SEM. Leveraging these spectroscopic imaging capabilities, our technique is able to image lateral electric fields across a prototypical silicon p-n junctions and to distinguish differently doped regions, even when buried beyond depths typically accessible by SEM. Intriguingly, the sub-surface sensitivity of this technique reveals unexpectedly strong surface band bending within nominally passivated semiconductor structures, providing useful insights for complex layered component designs, in which interfacial dynamics dictate device operation. These capabilities for non-invasive, multi-modal probing of complicated electronic components are crucial in today's electronic manufacturing but is largely inaccessible even with sophisticated techniques. These results show that seemingly simple SEM can be extended to probe complex and useful material properties.
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