Silicon wafer cross-section preparation: minimizing damage to reveal the true structure
Silicon wafers are hard and brittle, making cross-section preparation particularly sensitive to edge chipping, microcracks, and subsurface damage. These preparation-induced artifacts can affect subsequent optical microscopy and SEM analysis.
A controlled preparation process is therefore essential.
For this silicon wafer cross-section, the preparation route included:
• DiaRe P120–P400 diamond grinding discs for planar grinding
• POS rigid fine grinding disc + 9 μm PD-WT polycrystalline diamond suspension
• SC silk polishing cloth + 3 μm PD-WT polycrystalline diamond suspension
• ZN polyurethane polishing cloth + 0.05 μm SO-A439 colloidal silica suspension for final polishing
Using diamond grinding for the early stages helps maintain planeness while reducing the risk of damage to the brittle silicon. Final polishing with colloidal silica further removes residual surface damage and produces a clean cross-section for reliable microscopic examination.
Good silicon wafer preparation is not simply about achieving a mirror finish — it is about preserving the true condition of the material.
