Auger Electron Spectroscopy (AES) in Failure Analysis: Guide & Applications
ASTM C1292 shear strength test on continuous fiber ceramic composite measuring CMC interlaminar and in-plane shear for gas turbine and nuclear component design at Infinita LabAES as a Failure Analysis Tool in Semiconductors
When integrated circuits, power devices, or optoelectronic components fail — exhibiting elevated leakage, degraded threshold voltage, increased contact resistance, or complete functional failure — the root cause often lies in chemical changes at critical interfaces and surfaces at the nanometer scale. Auger Electron Spectroscopy (AES) failure analysis provides elemental identification and mapping at the precise depth and spatial scale where these chemical changes occur — making it the cornerstone surface analytical technique for the semiconductor, microelectronics, and optoelectronics industries when XPS resolution is insufficient or depth profiling of specific failure sites is required.
Common Failure Modes Diagnosed by AES
Contamination-Driven Gate Oxide Failures
Gate oxide integrity is the foundation of MOSFET performance. Ionic contamination — sodium, potassium, chlorine — at the Si-SiO₂ interface creates fixed oxide charges and interface trap states that shift threshold voltage and degrade subthreshold slope. AES depth profiling of failed gate oxide capacitor structures quantifies ionic contamination profiles at the SiO₂-Si interface with 1–2 nm depth resolution, directly correlating detected impurity concentrations with measured electrical parameter shifts.
Silicide Phase Transformation at Source/Drain Contacts
TiSi₂, CoSi₂, and NiSi silicide contacts on source, drain, and gate polysilicon must maintain correct phase and stoichiometry for low contact resistance. Incorrect silicidation temperature, oxygen contamination during anneal, or carbon contamination from photoresist strips can produce wrong-phase silicide (Ti₅Si₃, NiSi₂ rather than NiSi) with 2–10× higher resistivity. AES depth profiling of contact test structures identifies silicide phase composition and interface contamination responsible for elevated contact resistance.
Barrier Metal Failure in Cu Interconnects
Copper dual-damascene interconnects require TaN/Ta diffusion barriers to prevent Cu diffusion into surrounding dielectrics — which would create deep-level traps, leakage paths, and reliability failures. AES depth profiling of stressed interconnect cross-sections detects copper penetration through thinned or defective barrier regions at liner sidewalls, confirming barrier integrity failure as the root cause of time-dependent dielectric breakdown (TDDB) excursions.
Via Chain Resistance Failures
Elevated resistance in via chains — series-connected arrays of metal vias used for reliability testing and yield monitoring — arises from incomplete via fill, oxide residues in via bottoms, or interfacial contamination. AES spot analysis of FIB-exposed via cross-sections identifies oxygen-containing residues (SiO₂, Al₂O₃, WO₃) at tungsten or copper via-to-metal interfaces responsible for resistance increases.
Conclusion
Auger Electron Spectroscopy (AES) is a powerful failure analysis tool in the semiconductor industry, providing high-resolution elemental identification and depth profiling at critical interfaces. By detecting contamination, incorrect phase formation, barrier failures, and interfacial residues, AES enables precise root-cause determination of electrical and reliability failures, supporting yield improvement, device optimisation, and robust semiconductor manufacturing.
Why Choose Infinita Lab for Auger Spectroscopy Failure Analysis?
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Frequently Asked Questions (FAQs)
Why is AES used in semiconductor failure analysis? AES provides precise elemental mapping and depth profiling at critical interfaces, helping identify contamination, phase changes, and interfacial defects that affect device performance.
What types of failures can AES detect? AES diagnoses gate oxide contamination, silicide phase transformations, barrier metal failures in Cu interconnects, and via chain resistance issues.
How does AES differ from XPS in failure analysis? AES offers higher spatial resolution and depth profiling for specific sites, making it preferable when XPS cannot resolve nanoscale interfacial changes.
What industries rely on AES for failure analysis? Semiconductor, microelectronics, and optoelectronics industries use AES to troubleshoot ICs, power devices, and advanced interconnects.
What information does AES provide about device failures? It reveals elemental composition, contamination levels, diffusion of metals, phase changes, and interface chemistry directly linked to electrical performance degradation.
