Meaning
High-resolution imaging technique passes an electron beam through a thin specimen to map its internal structure at the atomic level. A scanning transmission electron microscopy system combines the scanning capabilities of a traditional electron microscope with the high resolution of transmission methods. This technique identifies individual atoms and chemical compositions within a material.
Such a tool is necessary for analyzing the fine details of semiconductor gates.
Atomic Visualization
Precise beam control enables the mapping of crystal lattices. Using scanning transmission electron microscopy, practitioners can identify the exact location of dopants or impurities within a silicon wafer. The probe scans across the sample while detectors record the electrons that pass through.
Analytical Depth
Chemical mapping adds a layer of information to the structural image. Modern scanning transmission electron microscopy setups often include energy-dispersive x-ray spectroscopy to identify the elements present in the sample. This combination allows for the detection of oxidation or contamination at the interface between two metal layers.
Forensic analysis at this scale reveals the specific causes of interfacial failure.
Sample Preparation
Thinning the material is the most difficult stage of the inspection process. Successful scanning transmission electron microscopy requires a specimen that is less than one hundred nanometers thick.
