three-dimensional dopant profiling

**3D Dopant Profiling** is a **metrology capability that maps dopant concentration in three spatial dimensions within semiconductor devices** — essential for characterizing modern 3D transistor architectures like FinFETs and gate-all-around (GAA) structures. **Key Techniques for 3D Dopant Profiling** - **Sequential SSRM**: Multiple 2D SSRM slices at different depths combined into a 3D map. - **Atom Probe Tomography (APT)**: True atomic-resolution 3D dopant positions with chemical identification. - **SIMS + Depth Profiling**: Layer-by-layer sputtering with mass spectrometry for depth profiles. - **SCM/SMM Tomography**: Multiple cross-sections combined for 3D capacitance/doping maps. **Why It Matters** - **3D Devices**: FinFETs, GAA-FETs, and CFET architectures require 3D understanding of dopant distributions. - **Process Optimization**: 3D doping non-uniformities (e.g., implant shadowing in fins) need 3D metrology. - **Modeling Validation**: TCAD simulations of 3D devices need 3D experimental validation. **3D Dopant Profiling** is **the complete map of where atoms are** — essential metrology for the 3D transistor era where 1D profiles are no longer sufficient.