Auger Electron Spectroscopy (AES) is a surface-sensitive analytical technique that identifies elemental composition within the top 1-5 nm of a material by detecting Auger electrons emitted during the relaxation of core-hole states created by a focused electron beam (typically 3-25 keV). The kinetic energies of Auger electrons are characteristic of each element, and the focused probe enables spatial resolution of ~10 nm—significantly better than XPS—making AES the technique of choice for nanoscale compositional mapping.

Why AES Matters in Semiconductor Manufacturing: AES provides high spatial resolution elemental analysis at surfaces and interfaces, essential for characterizing nanoscale defects, thin-film compositions, and interface chemistry in advanced semiconductor devices.

• Nanoscale compositional mapping — The focused electron beam (5-10 nm probe) enables elemental mapping at resolutions matching SEM imaging, allowing direct correlation between structural features and chemical composition • Particle and defect analysis — AES identifies the elemental composition of individual sub-micron particles and defects on wafer surfaces, tracing contamination sources and process excursions with single-particle sensitivity • Depth profiling — Combined with Ar⁺ ion sputtering, AES profiles element distributions through thin-film stacks with ~1 nm depth resolution, mapping diffusion, intermixing, and interface abruptness in gates, contacts, and barriers • Grain boundary segregation — In situ fracture combined with AES detects monolayer-level segregation of impurities (P, S, B, C) at grain boundaries in metals and polycrystalline semiconductors • Interface analysis — AES characterizes interface compositions at metal/semiconductor, metal/barrier, and dielectric/semiconductor boundaries with nanometer spatial and depth resolution simultaneously

Auger electron spectroscopy is the highest-spatial-resolution surface analysis technique routinely used in semiconductor manufacturing, providing nanoscale elemental mapping and depth profiling that enables precise characterization of defects, contamination, thin-film composition, and interface chemistry at the length scales relevant to advanced device architectures.