Negative PR Developer - CMOS grade

Cat. No.: N1523728

GRADE & PURITY CMOS grade

Storage

Room temperature

Shipped In

Normal

Specifications

Specifications & Purity

CMOS grade

Storage

Room temperature

Shipped In

Normal

Grade

CMOS grade

Application Protocols

No item‑specific, validated protocols are provided. The following general, literature‑based workflow can be adapted to negative PR development; confirm compatibility with your resist vendor’s datasheet.

General negative PR development workflow (not item‑specific)

1. After exposure, perform post‑exposure bake (PEB) per resist guidance to complete crosslinking.
2. Dispense developer in puddle mode to fully cover the wafer (typ. 200–400 rpm) or immerse/spray depending on tool.
3. Develop for a pre‑qualified time window, using gentle agitation or dynamic dispense. Maintain temperature control (±0.5 °C).
4. Quench/stop: For aqueous systems, DI water rinse for 30–60 s. For organic systems, solvent displacement rinse (e.g., IPA) then DI water if recommended.
5. Dry using spin‑rinse dryer (SRD) or N2 blow‑dry to prevent watermarking and collapse.
6. Postbake or hardbake if required for etch resistance.
7. Inspect (optical/SEM) and measure CDs; adjust dose/develop time iteratively to center the process window.

Item‑specific parameters (times, temperatures, dilutions): Not specified for this item; refer to CoA/Spec Sheet.

Biological Roles

Not applicable. This product is a materials processing chemical for microfabrication and does not have relevant biological functions or roles. For biochemical or cellular applications, consult reagents specifically designed for life science workflows.

Buffer Applications

Not applicable. This product is not a buffering agent and is not intended for biochemical pH control, electrophoresis, or cell culture. For laboratory buffer preparation, select dedicated buffer systems (e.g., phosphate, Tris, HEPES) as appropriate to your application.

Green Alternatives

Sustainability considerations depend on whether the developer is aqueous alkaline or organic‑solvent based. Composition for this item is not specified; the following is general, literature‑based guidance.

Comparison of common developer classes (general) • Aqueous alkaline developers

• Pros: Water as primary solvent; easier waste treatment (neutralization); non‑flammable; typically lower VOC emissions.
• Cons: High pH corrosivity; sensitivity to CO2 absorption (pH drift); potential for metal ion carryover. • Organic solvent developers (e.g., glycol ethers/esters, ketones)
• Pros: Excellent solvation for epoxy/novolak matrices; minimal ionic contamination; effective for thick, crosslinked negatives.
• Cons: Flammability/VOC emissions; potential reproductive toxicity for certain glycol ethers; more complex waste segregation and treatment. • Greener substitutions (contextual)
• Replace high‑hazard solvents (e.g., N‑methyl‑2‑pyrrolidone, where still used) with lower‑toxicity cyclic carbonates or safer glycol ether esters when resist compatibility permits (literature).
• Favor aqueous developers for compatible negative PR systems to reduce solvent usage and fire risk.
• Implement counterflow rinsing and point‑of‑use filtration to extend bath life and reduce chemical consumption.

Practical EHS tips • Use closed delivery and dispense to minimize fugitive emissions. • Capture and segregate waste for appropriate recycling or energy recovery where regulations allow. • Verify any substitution with full process qualification (CD, LER, adhesion, etch resistance).

Pharmaceutical Uses

Not applicable. This developer is a semiconductor processing chemical and is not intended for pharmaceutical formulation or excipient use. It is supplied for research and industrial R&D in microfabrication only. Refer to pharmacopeial excipients for pharmaceutical manufacturing needs.

Physical Properties

Because this is a formulated developer mixture, single‑compound constants do not apply.

Item‑specific values • Appearance: Not specified for this item; refer to CoA/Spec Sheet. • Density: Not specified for this item; refer to CoA/Spec Sheet. • Boiling point: Not specified for this item; refer to CoA/Spec Sheet. • Flash point: Not specified for this item; refer to CoA/Spec Sheet. • Viscosity: Not specified for this item; refer to CoA/Spec Sheet. • Refractive index: Not specified for this item; refer to CoA/Spec Sheet. • Water/solvent content: Not specified for this item; refer to CoA/Spec Sheet. • pH / alkalinity: Not specified for this item; refer to CoA/Spec Sheet. • UV cutoff/absorbance: Not specified for this item; refer to CoA/Spec Sheet.

General/literature context (not item‑specific) • Aqueous alkaline developers (negative or image reversal processes) are typically clear liquids with high pH and water as the main solvent; properties are dominated by water (bp ~100 °C, literature) with conductivity set by base content. • Organic developers used for epoxy‑based negative resists may be based on polar aprotic solvents (e.g., glycol ethers/esters) with bp often in the 140–200 °C range (literature) and moderate viscosities; flash points vary widely and must be confirmed per SDS. • Process‑relevant physical parameters commonly controlled in fabs include water content, base normality, metal ion content, particulate levels, and dissolved CO2 (literature).

Quality and Grades

• Grade: CMOS grade (as provided). This denotes suitability for semiconductor processing environments, emphasizing very low levels of particulates, ionic contaminants, and trace metals to minimize pattern defects, corrosion, and device leakage. It also implies batch‑to‑batch consistency and cleanroom‑compatible packaging and filtration. • What CMOS grade typically entails (literature/general):

• Filtration to sub‑micron or ultraclean standards to control particles that can cause pattern collapse or bridging.
• Controlled ionic/metal content (e.g., alkali, alkaline earth, transition metals) to protect gate oxides and junctions.
• Stringent TOC and residue control to mitigate watermarking and organic films after rinse/dry.
• Packaging in clean, low‑extractable containers; nitrogen headspace or barrier materials where applicable. • Item‑specific specifications (e.g., exact particle counts, metal limits, base normality, water content, UV absorbance): Not specified for this item; refer to CoA/Spec Sheet. • Implications for use: CMOS grade developers are appropriate for advanced lithography on Si, SiO2, SiN, compound semiconductors, and metals when used with validated resist systems. They reduce variability in CD (critical dimension) and line‑edge roughness attributable to chemical impurities. • Verification: Request and review the Certificate of Analysis for each lot to match your process window (e.g., development rate, compatibility with specific negative PR families).

Reaction and Applications

This product is not primarily a synthetic reagent; it is a process chemical for pattern development in photolithography.

Applications in microfabrication (literature/general) • Negative‑tone development: After exposure and post‑exposure bake (PEB), the developer dissolves unexposed or under‑crosslinked regions, revealing the negative image. Proper choice of developer strength and time controls CD and sidewall profiles. • Feature fidelity: Developer selectivity toward unexposed vs. crosslinked resist dictates line‑edge roughness (LER) and scumming. Agitation and temperature also influence development rate and uniformity across the wafer. • Multilayer stacks: In bilayer or hardmask processes, the developer should not attack bottom antireflective coatings (BARC) or adhesion promoters; solvent‑only developers can minimize substrate interaction. • MEMS and thick‑film lithography: For thick negative resists, developers with moderate diffusivity and low swelling help maintain high aspect ratios and prevent pattern collapse. • Lift‑off vs. etch mask: Negative PR development is typically followed by etch steps (dry or wet). Ensure that no developer residues remain that could inhibit plasma etch or metallization adhesion. • Process control tips:

• Use fresh, filtered developer; monitor bath age, conductivity/RI (if applicable), and temperature.
• Optimize dwell time via rate curves (thickness loss vs. time) for your exposure dose and PEB.
• Implement controlled rinsing to stop development cleanly and avoid footing or T‑top artifacts.

Item‑specific application notes from catalog: Not provided.

Reaction Conditions

While not a “reaction” in the synthetic sense, development conditions critically affect lithographic outcomes. Specific parameters for this item are not provided; the following are general, literature‑based guidelines for negative PR development.

General development parameters (literature/general) • Mode: Immersion, puddle, or spray development on tracks or benchtop tools. Puddle methods offer uniformity and reduced chemical usage. • Temperature: Typically ambient (20–25 °C). For tight CD control, maintain ±0.5 °C. Some processes benefit from slightly elevated temperature to increase rate; qualify carefully to avoid loss of selectivity. • Time: Common dwell times range from ~30 s to several minutes depending on resist thickness, exposure dose, PEB, and developer strength. Establish rate curves for your stack. • Agitation: Gentle agitation or dynamic puddle improves mass transport and uniformity; excessive agitation can cause pattern collapse in high‑AR features. • Rinse/stop: Immediate, copious DI water rinse for aqueous systems; for organic systems, displacement with a miscible solvent (e.g., IPA) followed by DI water or N2 dry per resist guidance. • Filtration: Use sub‑micron point‑of‑use filters to control particles; recirculating baths should include continuous filtration and periodic refresh. • Metrology: Monitor CDs, sidewalls, and residues via SEM/AFM; track bath age via conductivity or refractive index if applicable.

Item‑specific operating windows: Not specified for this item; refer to CoA/Spec Sheet and resist vendor recommendations.

Safety and Handling

Item‑specific hazard details (GHS classification, signal word, pictograms, H‑statements) are not provided here. Always consult the product SDS for authoritative safety information.

General precautions for developer solutions (literature/general) • Potential hazards: Depending on formulation, developers may be strongly alkaline (corrosive to skin/eyes) or organic solvent‑based (flammable, eye/skin irritant, CNS effects). Some glycol ethers and N‑alkyl amides have specific toxicological concerns; avoid inhalation and skin contact. • PPE: Chemical splash goggles, lab coat, and appropriate chemically resistant gloves (e.g., butyl/laminated film for strong solvents; nitrile for brief handling of less aggressive mixtures). Use face shield for splash‑prone operations. Closed‑toe shoes and long pants required in cleanroom/chemical areas. • Engineering controls: Use in a fume hood or ventilated lithography/develop track. For cleanroom processing, ensure exhaust flow is adequate and compatible with tool OEM guidance. • Incompatibilities: For alkaline developers—avoid acids, aluminum, reactive metals, and halogenated oxidizers. For organic solvent developers—keep away from ignition sources, oxidizers, and reactive alkali metals. Do not mix with photoresist waste unless validated for compatibility. • First aid (overview): Eye/skin contact—immediately flush with water for ≥15 minutes; remove contaminated clothing; seek medical attention. Inhalation—move to fresh air; obtain medical advice. Ingestion—do not induce vomiting; seek medical attention promptly. • Spill/response: Contain, absorb with compatible inert material, and dispose per local regulations. Prevent entry into drains. Neutralization of alkaline spills should be performed by trained personnel. • Waste: Segregate developer waste streams (aqueous vs organic) and label per facility EHS protocols.

Solvent Selection

As a formulated developer, solvent choice is intrinsic to the product. Selection guidance below is general to negative PR development and can assist in tool/process matching.

General/literature guidance (not item‑specific) • Polarity and solvation: Negative PRs typically crosslink upon exposure; developers must preferentially solvate unexposed or insufficiently crosslinked regions without attacking crosslinked networks. Two major classes exist:

• Aqueous/alkaline systems: High selectivity for acid‑catalyzed or image‑reversal chemistries; strong hydrogen‑bonding capacity; fully water‑miscible; easy rinse with DI water.
• Organic solvent systems (e.g., glycol ethers/esters, ketones): Moderate‑high polarity, good penetration into epoxy/novolak matrices; miscibility varies (often water‑immiscible to partially miscible), requiring solvent or IPA rinses. • Miscibility and rinse strategies:
• Aqueous developers: Rinse with copious DI water; final spin‑rinse/dry minimizes watermarking.
• Organic developers: Displacement rinse with compatible solvent (e.g., IPA), then DI water if allowed by resist; avoid phase‑separation traps on complex topography. • Tooling considerations: Puddle/spray tools benefit from controlled surface tension; surfactant‑containing developers can improve wetting but may leave residues if not properly rinsed. • When to choose: Match developer family to resist vendor recommendations. For epoxy‑based negative PRs (e.g., SU‑type), organic developers are common; for DNQ/novolak reversal or certain chemically amplified negatives, aqueous developers may be specified (literature). • Compatibility checks: Verify with test wafers for swelling, footing, and CD bias before process of record (POR) adoption.

Storage and Reconstitution

• Storage temperature: Room temperature (as provided). Maintain within typical cleanroom chemical storage ranges and avoid extreme heat or freezing. • Shipping: Shipped under normal conditions (as provided). • Container handling: Keep tightly closed when not in use to prevent contamination and, for alkaline systems, CO2 uptake which can alter pH (general guidance). Use clean, low‑extractable containers compatible with the developer chemistry. • Light and humidity: Store in a dry place away from direct sunlight. Moisture ingress can alter concentration in solvent‑rich or hygroscopic systems (general guidance). • Filtration and cleanliness: For CMOS applications, dispense through point‑of‑use filters appropriate to viscosity to control particulates (general guidance). • Reconstitution: Not specified for this item; refer to CoA/Spec Sheet. If supplied as ready‑to‑use, do not dilute; if supplied as a concentrate, prepare dilutions with high‑purity DI water or specified solvent under clean conditions as directed by the manufacturer. • Shelf life: Not specified for this item; refer to CoA/Spec Sheet. Track lot numbers and in‑use dates; periodically verify key parameters (e.g., development rate, conductivity/refractive index as applicable) to ensure performance. • Research use note: For research use only.

Structure and Identity

• Product type: Negative photoresist (PR) developer solution for microfabrication and lithography workflows. • Composition: Mixture (exact composition not disclosed). • Molecular formula: Not specified for this item; refer to CoA/Spec Sheet. • Molecular weight: Not specified for this item; refer to CoA/Spec Sheet. • SMILES: Not specified for this item; refer to CoA/Spec Sheet. • InChIKey: Not specified for this item; refer to CoA/Spec Sheet. • CAS: Not specified for this item; refer to CoA/Spec Sheet. • Structural features: As a formulated developer, this product does not correspond to a single molecular structure. Developers for negative PRs are commonly either organic solvent systems (e.g., glycol ethers, ketones, esters) or aqueous/alkaline systems (e.g., quaternary ammonium hydroxide), chosen to selectively dissolve unexposed or under‑crosslinked resist regions while preserving crosslinked features. • 2D structure (description): Not applicable to mixtures; the functional design is to provide controlled solvation and/or mild alkalinity to effect image development with high contrast and minimal swelling. • Identity confirmation: For process control, identity is typically verified by conductivity, refractive index, and/or titration (literature/general). Item‑specific methods are not specified; refer to CoA/Spec Sheet. • Synonyms/use context: Negative PR developer; lithography developer; resist developer (negative tone).

Synthetic Utility

Not applicable as a classical synthetic building block or reagent. Negative PR developer is a process chemical for lithographic pattern development rather than a substrate, catalyst, or reagent in chemical synthesis. For synthetic workflows, select solvents/reagents targeted to the desired transformation (e.g., bases, nucleophiles, oxidants).

Target Specificity

Not applicable. This product is not a biological targeting agent (e.g., antibody, ligand) and has no defined antigen/epitope specificity.