| HS Code | 307574 |
| Product Name | CMP Wafer Drying Additive Electronic/EL Grade |
| Chemical Composition | High-purity nonionic surfactant blend for post-chemical mechanical planarization cleaning |
| Grade | Electronic / EL Grade |
| Appearance | Clear colorless liquid |
| Solubility | Fully miscible in deionized water |
| Ph | 6.5 - 8.5 |
| Specific Gravity | 0.998 - 1.010 at 20°C |
| Flash Point | > 100°C |
| Purity | ≥ 99.9% |
| Water Content | ≤ 0.1% |
| Particulate Count | ≤ 10 particles per mL at ≥ 0.2 µm |
| Critical Micelle Concentration | Low, optimized for rinse and drying enhancement |
As an accredited CMP Wafer Drying Additive Electronic/EL Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 4-liter HDPE cleanroom bottles, nitrogen-purged and double-bagged to maintain electronic/EL grade purity. |
| Container Loading (20′ FCL) | CMP Wafer Drying Additive (Electronic/EL Grade) loaded as a 20′ FCL in sealed drums, palletized, strapped, and shrink-wrapped for secure transport. |
| Shipping | Shipment must comply with chemical transport regulations, using sealed, corrosion-resistant containers compatible with electronic-grade solvents. Avoid moisture and static exposure. Label as hazardous material if applicable, include SDS, and use grounded, temperature-controlled transport. Ensure proper segregation, leak-proof secondary containment, and documentation indicating “Electronic/EL Grade” purity for safe delivery. |
| Storage | Store in a clean, cool, dry, well-ventilated area between 15–30°C in tightly sealed original containers. Keep away from direct sunlight, moisture, acids, oxidizers, and sources of ignition. Use dedicated, contamination-free dispensing equipment. Avoid prolonged exposure to air. Follow manufacturer’s shelf-life guidelines to maintain Electronic/EL grade purity. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored sealed, unopened, at recommended temperatures, avoiding contamination. |
In post-CMP drying of 300 mm silicon wafers, the process boundary is governed less by gross rinse water removal than by the receding contact angle of the final UPW film on hydrophilic oxide surfaces; a receding contact angle above 65° on oxide is treated as a production tripwire because the water film recedes before dissolved silica can be removed, leaving watermarks after the spin-dry step. In single-wafer post-CMP cleaners fitted with isopropyl alcohol/N2 Marangoni drying modules—typically SCREEN SU-3200 or TEL CELLESTA systems running 25–40 wafers/hr—the EL-grade additive is metered into the final rinse line at 0.3–1.2 vol% as delivered and diluted by central UPW to a working concentration of 0.01–0.05 wt% active formulation. Surface tension of the working rinse is measured by ASTM D1331-20 du Noüy ring and maintained below 30 mN/m at 25°C; the additive keeps the receding contact angle on oxidized silicon below 20°, while a day-tank excursion above 32 mN/m is reported as an out-of-control alarm because it correlates with watermarks and colloidal silica residue. The preceding process step is oxide CMP using ceria or silica slurry, followed by double-side PVA brush scrubbing at 0.8–1.0 N/cm² contact load. The final spin recipe ramps from 800 rpm for 15 s to 1,200 rpm for 20 s and then 1,800 rpm for 60 s, with IPA vapor injection at 0.25–0.40 L/min per chamber and nitrogen flow at 200–400 slpm. Incoming chemical compliance is established by ASTM D5673-16 ICP-MS for total trace metals (<5 ppb as delivered), ASTM D512-12 chloride (<100 ppb), ISO 10304-1:2007 nitrate/sulfate speciation (<50 ppb per species), and ISO 21501-2:2019 liquid-borne particle counts at ≥0.2 µm (<10 particles/mL). The terminal product is the polished 300 mm silicon wafer ready for gate formation or interconnect deposition; front-end fabs typically inspect the post-dry surface on a KLA Surfscan unpatterned laser scanner at 19 nm defect bin. Additive drift above 1.2 vol% is problematic because surfactant micellization in the exhaust adsorption bed shortens service intervals, while operation below 0.3 vol% in a high-throughput tool with aged PVA brushes has been observed to produce incomplete sheet-flow and a nonuniform IPA curtain at the meniscus.
Compatibility in Cu/low-k dual damascene post-CMP is determined by the additive’s interaction with benzotriazole passivation films and porous organosilicate glass, not by wetting performance alone. The rinse bath is configured at 0.2–0.8 wt% active in UPW after dilution from the EL-grade liquid; the upper bound is set below the critical micelle concentration to avoid micellar solubilization of residual BTA from Cu CMP slurry, which would raise copper line resistance after barrier polish. On a three-platen Cu CMP tool with integrated cleaner—Applied Materials Reflexion GT with Desica module—the post-CMP sequence uses acidic pH 3.0–3.8 cleaning chemistry, megasonic-assisted UPW rinse, additive-containing final rinse, and Marangoni drying with 0.35 L/min IPA and 200–300 slpm N2. The EL-grade specification limits transition-metal impurities such as Fe, Co, and Cu to <1 ppb as delivered; ASTM D5673-16 ICP-MS and ISO 10304-1:2007 ion chromatography are used for batch qualification. The finished dual damascene wafer is processed into 14 nm and below logic interconnects and falls under RoHS Directive 2011/65/EU Annex II at finished device assembly. An operational boundary in production is that final rinse pH must not fall below 3.2 when the additive is present, because the combination of low pH and high shear in the brush scrubber accelerates copper corrosion under a partially wetted film; this is controlled by a conductivity trim on the rinse manifold. For porous low-k films with k≈2.5, the spin-dry recipe is extended to 90 s at 1,500 rpm to drive out capillary water from trench walls. Published data for the absorption isotherm of this specific additive in porous methylsilsesquioxane at 45% RH is limited, so manufacturing sites qualify the additive by post-clean k-value shift on a mercury probe and by SIMS analysis of carbon residue. The terminal product is the Cu/low-k interconnect wafer ready for subsequent via or cap deposition.
| Parameter | Test method | Control limit | Primary application stage |
|---|---|---|---|
| Total trace metals | ASTM D5673-16 | <5 ppb | All post-CMP final rinses |
| Chloride | ASTM D512-12 | <100 ppb | Cu/low-k, NiP substrate |
| Nitrate/sulfate | ISO 10304-1:2007 | <50 ppb per species | All final rinses |
| Particles ≥0.2 µm | ISO 21501-2:2019 | <10 particles/mL | Batch tank and day tank |
| Surface tension at 0.5 wt% in UPW | ASTM D1331-20 | ≤30 mN/m at 25°C | Marangoni dryer feed |
For through-silicon via reveal polishing on carrier-bonded 300 mm wafers thinned to 50–100 µm, the drying additive is formulated at 1.0–2.0 vol% in UPW to reduce surface tension to 26–30 mN/m at 25°C, which is required to wet high-aspect-ratio via openings without trapping air at the via bottom. The process follows copper reveal CMP on a high-precision platen, then a low-contact-load PVA sponge roller clean at 0.4 N/cm², megasonic DI rinsing at 950 kHz, additive spiking into the final rinse tank, and spin drying at 800 rpm for 20 s followed by 1,500 rpm for 50 s. Compliance for this application is confirmed with ASTM D5673-16 for trace metal extracts (<5 ppb), ASTM D512-12 for chloride (<100 ppb), ISO 10304-1:2007 anions, and ISO 14644-1:2015 Class 5 chemical preparation area; the finished TSV interposer or stacked die package is moisture-sensitivity classified under IPC/JEDEC J-STD-020E before transfer to HBM or 2.5D assembly. The terminal products are TSV interposer wafers and 2.5D/3D stacked dies for high-bandwidth memory and high-performance computing packages. In production-scale operation, the main defect mode is via-bottom residue rather than surface watermarks; when the additive concentration drops below 1.0 vol% during a high-throughput cassette sequence, incomplete via wetting produces bottom residue that is difficult to remove after debonding. Dose verification is therefore performed by in-line refractive index monitoring on the central feed rather than by periodic laboratory draw.
On silicon carbide substrates, the post-CMP drying additive is applied at a rinse bath temperature of 50°C ± 0.3°C; small thermal shifts alter the equilibrium surface tension of the water/additive film and generate localized watermarks on the Si-face. The addition ratio is 0.5–1.0 wt% in UPW, with surface tension held at 28–32 mN/m by ASTM D1331-20. If the day tank exceeds 32 mN/m, the subsequent megasonic rinse leaves residual colloidal silica aggregates that are visible at 0.12 µm inspection after drying. The route is SiC CMP on 150 mm or 200 mm semi-insulating or conducting wafers with high-pH colloidal silica slurry, followed by a brush scrub at 60 rpm rotation, megasonic-assisted UPW rinse, additive injection into the final rinse, and isopropyl alcohol/N2 drying. Equipment is a dual-side scrubber and a single-wafer spin dryer with top-side nitrogen curtain; the output is an epi-ready 4H- or 6H-SiC wafer for power MOSFET and Schottky barrier diode fabrication. Compliance for trace impurities uses ASTM D5673-16 ICP-MS with <1 ppb for Fe, Cr, Ni, and Cu, ASTM D512-12 chloride <50 ppb, ISO 10304-1:2007 anion profiling, and ASTM D1193-06 Type I water as the baseline UPW. The operational limitation is that the polypropylene day tank must not be replaced by an unlined stainless steel tank; Fe leaching from tank walls above 1 ppb produces a measurable increase in surface charge and particle adhesion on SiC. Published data for additive performance on 200 mm SiC post-CMP drying is limited; qualification data from 150 mm production lines indicate that the rinse must remain below 20° receding contact angle to avoid aggregate retention at the wafer edge.
In sapphire CMP for LED epi-ready substrate finishing, the drying additive is introduced after final polishing with alkaline colloidal silica on a copper or tin lap and after brush cleaning. The dosing is 0.3–0.8 vol% in UPW at 23–25°C, with the working bath viscosity held below 1.2 mPa·s so that the fluid sheet drains cleanly from the 2-inch and 4-inch c-plane flats without micro-droplet pinning at the wafer edge. The downstream production step is a cassette-based megasonic rinse tank followed by a heated spin dryer; the dry interface must leave no silica haze in the 0.1 µm inspection bin, because epi-ready sapphire wafers are loaded directly into MOCVD reactors without additional solvent cleaning. Compliance is maintained through ASTM D5673-16 for trace metals (<5 ppb total), ISO 10304-1:2007 for anionic impurities, and ISO 21501-2:2019 liquid particle count (<10 particles/mL at ≥0.2 µm). The terminal finished products are 2-inch, 4-inch, and 6-inch c-plane sapphire substrates for blue/green LED and power RF GaN epitaxy. A production bottleneck specific to this stage is that high edge-bead residue appears when the additive is dosed above 0.8 vol%; the residue migrates to the center during spin-dry and must be removed by an additional UPW rinse.
Disk substrate final polishing for hard disk drives applies the CMP drying additive as a final rinse after chemically accelerated superpolishing of NiP-plated aluminium or glass blanks. The final rinse bath is maintained at 0.2–0.8 wt% in DI water; chloride is quantified by ASTM D512-12 and anion profile by ISO 10304-1:2007. Chloride in the rinse must stay below 100 ppb because residual chloride on NiP promotes spot corrosion after cassette storage. The production process uses a 12-position double-sided polisher with colloidal silica and hydrogen peroxide chemistry, a pH-buffered brush scrub, additive-modified DI rinse in a cascade tank, and a cassette spin dryer with 180 s dry time at 50°C. Trace-metal compliance is verified by ASTM D5673-16 (<5 ppb each for Fe, Co, and Ni), and the finished substrate is a 95 mm OD, 0.635 mm thick aluminium or glass blank for perpendicular magnetic recording media. The additive duty here is shorter than in semiconductor wafer fabs, but the main process conflict is the transition from high-purity electronic cleaning to mechanical substrate cleaning where sub-ppm foaming can trap silica at the inner-diameter chamfer. At concentrations above 0.8 wt%, foam accumulation at the cassette exit has been observed in automated tools with top-side spray bars, so the rinse tank is equipped with a conductivity-based dosing lockout that prevents overfeed.
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Chemical mechanical planarization produces hydrated silica, ceria, or alumina particles, dissolved metal ions, and organic residues that persist after post-CMP cleaning. The CMP Wafer Drying Additive Electronic/EL Grade is a low-trace-metal, low-particle surface-tension-modifying liquid dispensed after the final deionized-water rinse to suppress watermark formation during Marangoni drying, spin-rinse drying, or IPA vapor drying. The Electronic/EL Grade designation is a lot-controlled classification rather than a single model number; supplier product codes commonly append EL to denote certification to sub-ppm trace-metal limits, 0.1 µm point-of-use filtration, and cleanroom-compatible PFA/FEP packaging. The product is water-miscible and formulated to reduce the surface tension of deionized water from 72.8 mN/m at 25 °C to a process window below 40 mN/m at typical dosing. This reduction alters droplet drainage and the evaporation-driven concentration gradient at the wafer edge, bevel, and scribe lines. The product is not a slurry dispersion aid, a post-CMP cleaning buffer, or a vapor-phase drying agent; its function is limited to the drying pass.
The additive is supplied as a supplier-controlled blend rather than a single defined molecule, so density, viscosity, refractive index, and surface-tension curves are lot-specific. In high-volume manufacturing, the material is metered into final rinse water or sprayed directly as a pre-dry treatment. Batch immersion cleaners with 100 L to 200 L rinse tanks typically maintain 2.0 vol% to 5.0 vol% dosing; single-wafer spin cleaners deliver 0.5 vol% to 2.0 vol% through nitrogen-pressurized dispense lines. Concentration is verified by refractive-index correlation or total organic carbon analysis. Point-of-use filtration at 0.05 µm or 0.1 µm is installed upstream of the dispense nozzle because additive-related particles can contribute to micro-bridge defects in sub-10 nm interconnect structures. Field failure modes in production lines include diaphragm metering pump stroke drift that produces concentration oscillation and periodic watermark signatures on wafer maps. Density-based mass-flow correction using lot-specific ASTM D4052-22 values reduces this variation. Dispense systems should use only virgin PTFE or PFA wetted parts; plasticized PVC or silicone are incompatible because plasticizer extraction contributes organic residue.
Watermark formation is governed by the balance between droplet evaporation rate and surface-tension-driven Marangoni flow. On hydrophobic low-k surfaces, rinse droplets with surface tension above 50 mN/m remain pinned at nanoscale topographic features; as water evaporates, dissolved silica, cupric ion, and complexing residues precipitate in ring-shaped profiles. The drying additive lowers liquid-air interfacial tension to 25 mN/m to 35 mN/m at 20 °C, allowing the film to drain uniformly before critical supersaturation is reached. The effective concentration window is narrow. Below 1.5 vol%, the surface tension remains too high for complete dewetting on porous low-k films. Above 6.0 vol%, residual organic phase can survive the dry step and leave a carbon-bearing film that is detectable by thermal desorption GC-MS or X-ray photoelectron spectroscopy. The surface-tension reduction is not linear: alcohol-ether systems often display a steep decline up to 2.0 vol%, followed by a plateau that varies with water uptake. Published data for specific additive compositions on porous low-k substrates are limited; process validation should include residue measurement after final dry rather than relying solely on supplier surface-tension curves.
In a Marangoni dryer, the additive is injected into the final rinse water or supplied as a separate low-flow stream at the meniscus. The concentration at the meniscus should be stable within ±0.2 vol% because local surface-tension variation distorts the film and can entrap droplets. In spin-rinse dryers, the additive is applied during the final rinse ramp and nitrogen purge. Typical application is 0.5 vol% to 1.5 vol% in deionized water dispensed at 500 mL/min to 1 L/min for 20 s to 60 s, followed by nitrogen purge at 800 rpm to 1,200 rpm. These are representative ranges, not universal recipes, and must be validated on the specific tool configuration. Published data for this specific configuration is limited.
Lot-controlled quality separates electronic/EL grade from industrial drying aids. A certificate of analysis typically reports density, viscosity, water content, surface tension, non-volatile residue, and a 36-element trace-metal scan. Trace metals are determined by ICP-MS per SEMI C43, with reporting limits at or below 1 ng/g for iron, copper, nickel, chromium, calcium, sodium, and potassium. Low sodium and potassium are critical because alkali ions migrate under bias at interconnect temperatures and can shift threshold voltage or degrade oxide breakdown. Water content is measured by Karl Fischer titration per ASTM E203-16. Particle counts are determined by laser light-scattering after retention on a 0.1 µm membrane. Industrial-grade fluids may omit trace-metal certification, may ship in high-density polyethylene or steel containers, and may contain stabilizer packages that leave non-volatile residue after dry. Those differences are not cosmetic; they affect defect maps on immersion rinse tools and single-wafer sprays.
| Property | Test Method | Electronic/EL Grade Typical Acceptance |
|---|---|---|
| Density at 20 °C | ASTM D4052-22 | 0.80–0.90 g/cm³ |
| Kinematic viscosity at 25 °C | ASTM D445-21 | 2.0–4.0 mm²/s |
| Surface tension at 20 °C | ASTM D1331-20 | 25–30 mN/m |
| Water content | ASTM E203-16 | ≤ 0.10 wt% |
| Non-volatile residue | ASTM D1353-13 | ≤ 5 ppm |
| Total trace metals, 36-element scan | SEMI C43 ICP-MS | ≤ 100 ng/g |
| Individual trace metal | SEMI C43 ICP-MS | ≤ 10 ng/g |
| Particle count ≥ 0.1 µm | SEMI C90 | ≤ 25 particles/mL |
These values are representative lot-release criteria for electronic/EL-grade drying additives; supplier-specific certificates govern final acceptance. Statistical process control monitors batch-to-batch variance in surface tension and water content because these two parameters affect final film drainage. Water uptake shifts the mass fraction of the surface-active component and alters the refractive-index correlation used by inline concentration monitors. Storage lines must therefore be blanketed with dry nitrogen, and dispense lines pre-dried when ambient relative humidity exceeds 60%. Viscosity control is equally important for magnetically coupled gear pumps: a drift of 0.5 mm²/s can change delivery volume at constant stroke frequency and shift the blended concentration by several tenths of a volume percent.
At the device level, low sodium and potassium are critical because alkali ions migrate under bias at interconnect temperatures and can shift threshold voltage or degrade gate oxide breakdown. The electronic/EL grade places individual trace-metal limits at ≤ 10 ng/g for mobile ion species, and some manufacturers further specify sodium and potassium at ≤ 1 ng/g for front-end-of-line compatibility. This is not a uniform industry value; it is a typical upper bound in semiconductor-grade chemical specifications. The difference between a 10 ng/g and 100 ng/g bulk metal limit can be decisive when the additive is used after tungsten or cobalt polish, where exposed metal films are more susceptible to galvanically enhanced contamination.
The product is supplied in PFA or FEP containers because high-density polyethylene can leach aliphatic and aromatic oligomers into the product during storage. Container liners are cleaned with ultra-pure water and dried with filtered nitrogen before filling, and the fill volume is controlled to leave a nitrogen headspace. In high-volume fab lines, the container is often placed in a chemical cabinet with extraction and secondary containment to limit moisture ingress and volatile organic compound exposure. Retrofit into existing lines requires checking seal materials; Kalrez or Chemraz O-rings are preferred over EPDM or Viton when exposure time exceeds 4 h per day.
Because the formulation may contain flammable alcohol components, dryer exhaust interlocks and solvent concentration monitoring are required when recirculating heated air is used. The additive is not a replacement for post-CMP cleaning chemistry: slurry particles must be removed before the drying pass. In copper/low-k integration, avoid combining the drying additive with amine-based rinse additives in the same tank, because amine uptake into the residual organic film can raise surface pH and promote copper oxide growth before the wafer reaches the vacuum cassette. Residual additive films can also migrate into porous low-k dielectrics during queue time. The effective diffusivity and adsorption of hydrophilic ether components into methylsilsesquioxane-based porous films are not fully characterized; outgassing at subsequent barrier metal deposition can generate defectivity. Therefore the wafer should move to the next thermal step without extended atmospheric queue time.
Missing concentration verification can produce two distinct failure patterns. In batch tools, carry-over from a prior acid rinse can dilute the additive and create a surface-tension gradient across the bath surface; wafers near the weir may show watermarks while wafers at the inlet remain dry. In single-wafer tools, a failed refill sensor or a collapsed dispense line can produce air bubbles that deliver discontinuous additive coverage. The operational response is to align refractive-index feedback from inline monitors with lab-based surface-tension measurement (ASTM D1331-20). The acceptable correlation coefficient between inline refractive index and surface tension should be verified for each new lot because isomer distribution in alcohol-ether blends can shift refractive index without proportional surface tension change. If the blend contains two or more surface-active components with different refractive indices, single-point calibration against total organic carbon may be required. This is particularly true for recycled rinse streams that accumulate acidic or basic carry-over. The lab check should be performed at the same temperature as the dispense bath; a 2 °C difference can shift refractive index by more than 0.0005 RI and produce a false concentration alarm.
Neat isopropyl alcohol has a surface tension of approximately 23 mN/m at 20 °C, lower than many formulated additives; however, its higher vapor pressure and flammability require explosion-proof storage and lower TLV exposure limits. Industrial-grade drying aids may use the same base chemistry but lack trace-metal certification and particle control. The electronic/EL grade is specified for sub-ppm metal levels and is filtered into PFA/FEP containers with lot-specific certificates. It also differs from commodity industrial surfactants by excluding non-ionic alkylphenol ethoxylate stabilizers that can leave measurable carbon residue after drying at 120 °C. The product is dispensed as a liquid and works with the existing rinse process rather than replacing vapor dryer hardware.
| Parameter | Neat IPA, semiconductor grade | Industrial-grade drying aid | Electronic/EL grade |
|---|---|---|---|
| Surface tension at 20 °C | ~23 mN/m | Lot-dependent, often 28–35 mN/m | 25–30 mN/m |
| Trace-metal certification | SEMI C43 ICP-MS | Often absent | SEMI C43 ICP-MS, individual ≤ 10 ng/g |
| Particle control ≥ 0.1 µm | Point-of-use filtered | Not specified | ≤ 25 particles/mL |
| Non-volatile residue | ≤ 5 ppm | Lot-dependent | ≤ 5 ppm |
| Packaging | PFA/FEP drums | HDPE or steel | PFA/FEP containers |
| Vapor-phase hazard | Higher vapor pressure, Class IB flammable liquid | Variable | Combustible, lower vapor pressure than neat IPA |
Storage is recommended at 10 °C to 25 °C in sealed fluoropolymer containers under dry nitrogen. Freeze-thaw cycling should be avoided because phase separation in water-containing formulations can shift surface tension by more than 2 mN/m. Shelf-life claims vary by supplier; the lot certificate should be referenced before reintroducing material into a production line after long-term hold. The additive has not been validated for direct-contact lithography, and published data for this specific configuration is limited.
