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Contrast Mechanisms in Secondary Electron e-Beam-Induced Current (SEEBIC) Imaging
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Contrast Mechanisms in Secondary Electron e-Beam-Induced Current (SEEBIC) Imaging
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Journal Article
Contrast Mechanisms in Secondary Electron e-Beam-Induced Current (SEEBIC) Imaging
2022
Overview
Over the last few years, a new mode for imaging in the scanning transmission electron microscope (STEM) has gained attention as it permits the direct visualization of sample conductivity and electrical connectivity. When the electron beam (e-beam) is focused on the sample in the STEM, secondary electrons (SEs) are generated. If the sample is conductive and electrically connected to an amplifier, the SE current can be measured as a function of the e-beam position. This scenario is similar to the better-known scanning electron microscopy-based technique, electron beam-induced current imaging, except that the signal in the STEM is generated by the emission of SEs, hence the name secondary electron e-beam-induced current (SEEBIC), and in this case, the current flows in the opposite direction. Here, we provide a brief review of recent work in this area, examine the various contrast generation mechanisms associated with SEEBIC, and illustrate its use for the characterization of graphene nanoribbon devices.
Publisher
Cambridge University Press,Oxford University Press
