Case Study
Trace Metal Contamination on Silicon Wafers
This is a representative example pending publication of a real, client-approved case study.
Challenge
A semiconductor manufacturing team needed to understand whether trace metals on silicon wafer surfaces were contributing to downstream yield concerns. The investigation required a surface-sensitive method compatible with bare silicon and oxide-bearing wafers while preserving chain-of-custody and avoiding additional contamination during handling.
Approach
Representative wafers were processed with vapor phase decomposition sample preparation, collecting surface residues into clean scan solution for HR-ICP-MS analysis. Results were reviewed by wafer location and process context to compare suspect material with reference wafers and to identify patterns consistent with a tool, bath, or handling source.
Result
The analysis qualitatively narrowed the likely source of contamination and helped the team prioritize process checks and cleaning verification. Follow-up testing provided evidence that the corrective actions reduced the surface metal signature relative to the original suspect condition.