IPA for Semiconductor Wafer Cleaning
Isopropyl alcohol is the highest-volume wet process solvent in semiconductor manufacturing, consumed at every node from 28nm to sub-3nm in wafer cleaning, CMP post-clean, and Marangoni drying sequences.
Why purity matters: IPA purity directly impacts yield. Even sub-ppb metallic contamination in rinse IPA deposits on gate oxide surfaces, causing threshold voltage shifts. Particle redeposition from low-LPC IPA creates killer defects at post-CMP and post-etch steps.
Specification Requirements
Critical Parameters for Semiconductor Wafer Cleaning
Each parameter directly impacts process outcome — understand why each limit exists.
| Parameter | Requirement | Why This Limit Exists |
|---|---|---|
| Assay (GC-FID) | ≥99.0% (G1) to ≥99.9999% (G5) | Higher assay = lower organic impurity background in rinse |
| Total Metals (ICP-MS) | ≤50 ppb (G1) to <0.1 ppb (G5) | Metal ions deposit on gate oxide and cause Vt shift |
| Particles ≥0.5 μm (LPC) | ≤500/mL (G1) to ≤5/mL (G5) | Particles cause post-CMP yield excursions and etch defects |
| Water (Karl Fischer) | ≤500 ppm (G1) to ≤5 ppm (G5) | Excess water reduces Marangoni drying efficiency |
| Acetone (GC) | ≤500 ppm (G1) to ≤1 ppm (G5) | Acetone disrupts Marangoni surface tension gradient |
Grade Selection
Which Grade Do You Need?
Match your process node and contamination budget to the right grade — every grade available with full CoA.
All grades tested by ICP-MS (28 elements), in-line LPC (ISO Class 3 fill), and Karl Fischer titration. G5 = SEMI C1 Tier D. Full CoA per lot. Request CoA template →
Technical FAQ
Expert Answers
What IPA grade is required for sub-7nm CMP post-clean?
G5 (SEMI C1 Tier D) is specified: ≥99.9999% purity, metals <0.1 ppb, particles ≤5 ct/mL at ≥0.5 μm, water ≤5 ppm. G4 is acceptable for 14–28nm applications.
Why does Marangoni drying require G5 IPA specifically?
Marangoni drying relies on surface tension difference between IPA (22 mN/m) and water (72 mN/m). G5 IPA requires: water ≤5 ppm (maintains surface tension gradient), acetone ≤1 ppm (prevents Marangoni flow instability), metals <0.1 ppb (prevents surface deposition). Lower grades cause watermarks and stiction.
What packaging is available for electronic grade IPA?
4L (qualification), 18L (R&D), 200L drum (production), 1000L IBC (high-volume), bulk tanker (gigafactory). All G4/G5 containers use N₂ blanket fill.
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Semiconductor Wafer Cleaning
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