channeling rbs

**Channeling RBS** is the **combination of Rutherford Backscattering Spectrometry with ion channeling** — aligning the analysis beam along a crystal axis to measure crystal quality, damage depth profiles, and impurity lattice site locations with high sensitivity. **What Does Channeling RBS Measure?** - **Minimum Yield ($chi_{min}$)**: Crystal perfection. Perfect Si: $chi_{min}$ ~ 2-3%. - **Damage Profile**: Dechanneling rate vs. depth reveals the depth distribution of crystal damage. - **Substitutional Fraction**: If impurity signal decreases in channeled spectrum, impurity is on substitutional sites. - **Amorphous Layer**: Amorphous layers show $chi = 1$ (random yield) in the channeled spectrum. **Why It Matters** - **Implant Characterization**: Gold standard for characterizing ion implant damage and amorphization. - **Epitaxy Quality**: Measures epitaxial layer crystallinity and interface quality. - **Site Location**: Determines whether dopants are electrically active (substitutional) or inactive (interstitial/clustered). **Channeling RBS** is **crystal quality measurement via ion steering** — using the channeling effect to probe lattice perfection and dopant incorporation.