Electron microscopy (EM) is a powerful family of imaging techniques used across a wide range of industries and research areas, including semiconductors, electronics, batteries, polymers, metals, biological materials, and advanced manufacturing. By using electrons instead of light, EM reveals structures and defects at the micro- and nanoscale with exceptional detail.
Electron microscopy plays a critical role in process development, failure analysis, and quality control by helping researchers visualize surface topography, material contrast, crystal structure, and nanoscale defects. This eBook introduces the fundamental principles behind electron microscopy and explains how different imaging modes—SEM, TEM, and STEM—are used to answer different types of technical questions.
Readers will also learn how electron signals are generated, how TEM samples are prepared using focused ion beam (FIB) techniques, and how key imaging parameters such as beam energy, probe size, dwell time, and charging affect image quality. This eBook is designed to help you build a practical understanding of electron microscopy and approach future EM projects with greater confidence
SEM, TEM or STEM: which answers your question?
Each electron microscopy mode answers a different question. Picking the wrong one costs time, samples and clarity.
| Mode | What it shows | Sample | Best for |
| SEM | Surface shape and texture, from mm down to ~1 nm; elements with EDS | Bulk parts, coated if non-conductive | Fractures, particles, coatings, first look in failure analysis |
| TEM | Internal structure, crystal defects, interfaces, layer thickness | Thin lamella, typically 20–100 nm | Thin films, grain boundaries, device cross-sections |
| STEM | Atomic-number contrast plus element maps (EDS, EELS) at each point | Same lamella as TEM | Layer chemistry, interfaces, dopant and composition mapping |
How TEM samples are made
TEM and STEM need a slice thin enough for electrons to pass through. A focused ion beam (FIB) cuts this lamella from the exact spot you care about, such as one transistor, via or defect. A protective cap and low-energy final polishing keep milling damage away from the area being imaged.
Settings that change your results
The eBook covers the four imaging settings that matter most:
- Beam energy: how deep the beam reaches into the sample
- Probe size: the resolution you can actually achieve
- Dwell time: the trade-off between noise and beam damage
- Charging: why non-conductive samples smear or drift, and how to stop it
Who it's for
Engineers and scientists in semiconductors, electronics, batteries, polymers and metals who order or interpret electron microscopy for process development, failure analysis or quality control.