AFM for semiconductor surface metrology
Atomic force microscopy (AFM) is used in semiconductor research and process metrology to measure local surface roughness, step heights and the shape of small features. A tip scans the surface to build a height map, helping teams examine wafers, films and patterned structures.
Comparing process conditions or locations across a wafer requires repeated measurements. The practical challenge is to retain useful tip geometry while collecting reliable data efficiently. That makes durability and high-speed AFM development important to semiconductor metrology.
Published by Tiny Infinities · 21 September 2026
Updated 25 September 2026
Where is AFM used in semiconductor metrology?
- Wafer polishing: compare local surface roughness before and after chemical mechanical polishing (CMP), or examine scratches and pits.
- Wafer bonding: assess the roughness of surfaces being prepared for bonding.
- Thin-film development: examine surface texture and growth features.
- Patterning and etching: measure accessible steps and recesses using height images and profiles.
Park Systems’ surface-metrology overview describes semiconductor uses including CMP and wafer bonding. Across these applications, AFM helps connect a process change to a measured surface change.
From one image to reliable comparisons
AFM becomes particularly useful when comparing surfaces at different stages of a process. A height map can help show whether polishing has smoothed a surface or an etch has changed a feature’s depth.
But the image also depends on the probe. A tip that cannot reach the bottom of a narrow recess can make it appear shallower than it is, as our tip-geometry guide explains.
That connection between tip shape and image becomes important when measurements are repeated. If the tip changes during use, an apparent change in the surface may come from the probe itself. This is why durability matters beyond the cost of replacing a tip.
Why tip durability matters
Tip wear can gradually change the view of a wafer surface. As a tip becomes wider, fine valleys may become less accessible and features may appear broader. A surface can therefore look different late in a measurement series even when the sample itself has not changed. This link between wear and dimensional measurements is the subject of NIST’s study of critical-dimension AFM tips.
The value of a durable tip is that it can preserve useful geometry through more of those measurements. That helps keep comparisons meaningful while reducing interruptions for probe replacement. Our tip-wear guide explains how wear develops and affects the image.
Where faster AFM scanning adds value
Durability helps sustain a measurement series, but each image still takes time to acquire. For semiconductor teams, faster AFM scanning can make it practical to look at more wafer locations or compare more process conditions, revealing differences that a smaller set of images might miss.
A faster scan is useful only if the image still captures the features of interest. At higher speeds, the probe and instrument have less time to respond to changes in surface height, which can distort the image if their response is too slow. This balance between speed and faithful surface tracking is central to high-speed AFM probe design.
How PolarTip addresses these needs
Tiny Infinities develops PolarTip, our silicon carbide (SiC) AFM probe line, around feature access, tip life and scanning response. Hard SiC provides the basis for tips designed to retain their geometry through repeated measurements.
Our high-speed work considers cantilever geometry, tip mass and damping alongside instrument compatibility. Fast-scanning configurations remain in development, with performance to be measured in the intended setup. Pilots evaluate useful tip life and image quality under agreed conditions.
To explore a semiconductor application, share the surface feature, AFM setup and the limitation you want to address: access, replacement frequency or acquisition time.