Positive PR Developer - MOS grade

Cat. No.: P1523725

GRADE & PURITY MOS grade

Storage

Room temperature

Shipped In

Normal

Specifications

Specifications & Purity

MOS grade

Storage

Room temperature

Shipped In

Normal

Grade

MOS grade

Application Protocols

No item-specific, validated protocols are provided in the Product Data.

• General workflow for positive PR development (literature; adapt to your resist and tool):
  • Soft bake and expose resist per vendor recommendations.
  • Post-exposure bake (for CARs) to control acid diffusion and deprotection.
  • Develop using the positive PR developer with controlled time and temperature; employ spin-puddle, spray, or immersion as qualified.
  • Rinse thoroughly with DI water; dry with N2 or IPA displacement as appropriate.
  • Inspect patterns (optical/SEM); adjust time/temperature/agitation for CD tuning.

For process of record (POR), consult your resist supplier’s datasheet and request this item’s CoA/Spec Sheet for any composition and handling specifics.

Biological Roles

This product is an industrial microfabrication developer and has no biological role. It is not intended for use in biological systems.

• Research-use note: For research use only (per Product Data).
• Any discussion of metabolism, signaling, or cellular interactions is not applicable.
• Handle as a laboratory/industrial chemical; do not introduce into biological assays or living systems.

Buffer Applications

Not applicable. This product is a lithographic developer, not a biological or analytical buffer system.

• It is not used for preparing biochemical buffers, cell culture media, or electrophoresis systems.
• If you require high-pH buffers for biochemical work, consult dedicated buffer reagents (e.g., Tris, CAPS); do not substitute lithography developers.

Green Alternatives

Positive PR development traditionally relies on aqueous quaternary ammonium hydroxides (e.g., TMAH), which present toxicity and waste-treatment challenges. Greener pathways focus on reducing hazard while maintaining lithographic performance.

• Potential alternatives (literature/general; evaluate for your process):

  • Choline hydroxide developers: Lower acute toxicity vs TMAH while offering similar basicity; may require re-optimization of exposure/PEB and development times.
  • Carbonate/bicarbonate or silicate-based developers: Buffering can moderate attack on some materials; often suited to legacy novolak/DNQ resists; limited for advanced CARs.
  • Lower-normality developers with optimized rinsing/agitation: Reduce chemical usage while holding CD through process control.
  • Closed-loop reclamation and on-tool filtration: Minimizes waste volume and extends bath life, reducing environmental footprint.

• Trade-offs to consider:

  • Resolution and LER: Alternative bases/buffers may change dissolution contrast and stochastic behavior; extensive re-qualification is needed.
  • Materials compatibility: Corrosion rates and residue profiles can differ; verify on Cu/Al interconnects and advanced dielectrics.
  • EHS profile: While choline is less acutely toxic than TMAH, strongly basic pH still requires stringent controls.

• Comparison (general)

  • Conventional TMAH: Excellent litho performance; high toxicity; mature supply chain.
  • Choline hydroxide: Improved EHS; possible process adjustments; growing adoption in specialty nodes.

No specific formulation details for this item are provided; assess greener options within your fab’s change-control framework.

Pharmaceutical Uses

Not applicable. This product is not formulated as a pharmaceutical excipient or for any clinical/manufacturing use in drug products.

• No pharmacopeial status is provided.
• For formulation or GMP contexts, procure qualified excipient-grade materials specifically designated for such use.

Physical Properties

• Item-specific physical data

  • Appearance: Not specified for this item; refer to CoA/Spec Sheet.
  • Density, refractive index, conductivity, pH, viscosity: Not specified for this item; refer to CoA/Spec Sheet.
  • BP/MP, solubility parameters: Not applicable as a formulated aqueous mixture; item-specific values not specified.

• Typical values for positive PR developers (literature/general; not specifications for this item):

  • Composition: Aqueous alkaline solution (often 0.20–0.26 N for certain i-line/DUV resists), sometimes with surfactants and chelators.
  • pH: Strongly basic, commonly ~13–14 at 25 °C for quaternary ammonium hydroxide developers.
  • Density: Near that of water (≈1.00–1.03 g/mL at 20–25 °C), depending on concentration/additives.
  • Conductivity: Typically high (tens of mS/cm) for strong base solutions.
  • Boiling point: Near that of water with elevation depending on concentration (≈100–103 °C, atmospheric).
  • Viscosity: Slightly above water; agitation and temperature strongly influence development rate and LER/LWR.
  • Materials compatibility: Attacks Al, Cu, Sn, Zn, and some nitrides/oxides at elevated temperature; compatible with most Si/SiO2/Si3N4 stacks in tightly controlled processes. Always verify on the specific stack.

• Practical notes (general):

  • Temperature strongly influences dissolution kinetics; a few degrees can change CD by several nanometers in sub-100 nm nodes. Use controlled bath (±0.1 °C) and track age/loading of the bath for reproducibility.

Quality and Grades

• Item-specific grade

  • Grade: MOS grade (per Product Data).

• What MOS grade typically implies (general/industry usage; not specifications for this item):

  • Designed for semiconductor manufacturing and microfabrication of metal–oxide–semiconductor (MOS) structures.
  • Emphasis on ultra-low trace metal contamination, particulate cleanliness, and organic residue control to protect device performance and yield.
  • Typical attributes for MOS-grade wet chemicals include:
    • Low total metal ion content (ppb-level) verified by ICP-MS (exact limits not specified for this item).
    • Low total organic carbon (TOC) to minimize residue (exact limits not specified for this item).
    • Filtration to sub-micron levels and packaging in cleanroom-compatible containers.
    • Batch-to-batch control of normality and conductivity for process reproducibility.

• Practical considerations for users:

  • Request the batch CoA/Spec Sheet for actual limits (metals, particles, TOC, base normality) and QA test methods.
  • If integrating into a qualified lithography module, document cross-lot CD stability, LER/LWR, and defectivity; track bath age and loading (throughput) as part of SPC.
  • For critical layers, consider point-of-use filtration (e.g., 0.05–0.1 µm) and nitrogen blanketing to minimize CO2 uptake where relevant.

Reaction and Applications

As a microfabrication chemical, this product is used in lithographic pattern development rather than as a reagent for bench chemical reactions.

• Lithography applications (general, literature):

  • Positive-tone development: Selective dissolution of exposed regions of novolak/DNQ or chemically amplified resists after exposure (UV, DUV, e-beam) to create relief patterns.
  • Critical dimension (CD) control: Development time, temperature, and agitation determine CD and sidewall profiles; tight SPC is essential for sub-100 nm features.
  • Line edge/width roughness (LER/LWR): Controlled dissolution kinetics and surfactant packages reduce stochastic roughness.
  • Top/bottom anti-reflective coatings (T/BARCs): Ensure compatibility; some BARCs require tailored developers or rinse sequences.
  • Lift-off processing: Positive resist undercut may be tuned via exposure/development for metal lift-off; ensure developer does not attack adhesion layers.

• Process integration tips (general):

  • Perform post-exposure bake (PEB) as per resist vendor to fix acid diffusion and deprotection (for CARs) before development.
  • Use temperature-controlled baths (±0.1 °C) and defined agitation (one- or two-fluid spray, spin puddle) for reproducibility.
  • Implement cascade DI water rinses to rapidly quench development and remove scum; consider CO2 control if carbonate formation alters pH.
  • Monitor bath loading (dissolved resist content) and age; refresh based on process windows to maintain CD.

Note: No item-specific application parameters are provided; consult the resist vendor and this product’s CoA for qualified processes.

Reaction Conditions

Process conditions below are general literature guidance for positive PR development and are not specifications for this item. Always follow your resist vendor’s process notes and your fab’s qualified recipe.

• Typical modes (general):

  • Spin-puddle development: Dispense developer on a spinning wafer, dwell 30–90 s, followed by DI water rinse and N2 dry.
  • Spray or immersion development: Temperature-controlled bath (e.g., 20–25 °C), defined agitation; develop 30–120 s depending on resist and feature size.

• Key variables and their effects:

  • Normality (base concentration): Higher normality increases dissolution rate but can raise LER and reduce process latitude.
  • Temperature: +1 °C can significantly alter CD; maintain ±0.1 °C.
  • Agitation/shear: Uniform flow reduces scumming and pattern collapse; excessive shear can induce footing or pattern damage.
  • Rinse strategy: Immediate DI water quench; multi-stage cascade reduces redeposition; optional IPA displacement minimizes watermarking.

• Materials integration (general cautions):

  • Metals (Al, Cu): Risk of corrosion; consider protective layers or minimized dwell.
  • Porous low-k: Potential uptake and swelling; verify with cross-section SEM and ellipsometry.

• Metrology and control:

  • Monitor CDs via CD-SEM; track LER/LWR and profile via SEM/FIB.
  • Implement SPC on bath age/loading, temperature, and develop time to maintain overlay and CD targets.

No item-specific concentration, temperature, or time is provided; refer to CoA/Spec Sheet.

Safety and Handling

• Item-specific hazard data

  • Signal word / H-statements / Pictograms / GHS classification: Not specified for this item; refer to SDS.

• General safety guidance for positive PR developers (literature/general):

  • Strongly alkaline; causes severe skin and eye burns. Immediate eye irrigation (≥15 minutes) and medical attention are recommended after exposure.
  • Many commercial developers are based on quaternary ammonium hydroxides (e.g., TMAH). TMAH solutions are acutely toxic; skin exposure can be life-threatening due to systemic toxicity. Use chemical-resistant gloves (e.g., butyl rubber, laminated film), face shield, and splash goggles; lab coat or chemical apron.
  • Use in a chemical fume hood or enclosed wet bench with appropriate ventilation. Avoid aerosol generation and splashing.
  • Incompatibilities: Acids (violent neutralization), aluminum and other reactive metals, halogenated oxidizers, and ammonium salts that could produce hazardous byproducts. Do not mix with bleach or oxidizers.
  • Spills: Contain with compatible absorbent; neutralize carefully with dilute acid after risk assessment. For TMAH-containing solutions, use specialized spill kits and trained personnel.
  • First aid (overview; defer to SDS):
    • Skin: Immediate decontamination with copious water; remove contaminated clothing.
    • Eyes: Rinse thoroughly for ≥15 minutes; seek urgent medical care.
    • Inhalation: Move to fresh air; monitor for respiratory irritation.
    • Ingestion: Do not induce vomiting; rinse mouth; obtain medical attention.
  • Waste: Collect as high-pH, amine-containing aqueous waste. Follow local regulations and institutional protocols.

Always consult the product’s SDS and site EHS procedures for authoritative instructions.

Solvent Selection

This product is not an organic solvent but an aqueous developer formulated for positive photoresists. Solvent-selection concepts apply to rinsing and process integration rather than dissolution of solutes.

• Polarity and miscibility (general):

  • Highly polar, water-based; fully miscible with deionized (DI) water.
  • Post-develop rinse is typically DI water to stop development and remove dissolved resist; a final displacement rinse with IPA or N2 dry may be used depending on process module.

• When to choose a positive PR developer vs alternatives (general):

  • Use for positive-tone novolak/DNQ resists and chemically amplified positive resists (i-line/DUV/ArF) where base solubility contrast is required.
  • For negative-tone resists (e.g., epoxy/epoxide-based SU-8 or negative CARs), dedicated developers (e.g., PGMEA) are usually preferred.

• Materials compatibility considerations (general):

  • Aqueous base can corrode Al, Cu, Zn, and certain transparent conductors; evaluate hardmask and interconnect stacks.
  • Generally compatible with Si, SiO2, Si3N4; check for etch or swelling of low-k dielectrics and hardmasks.

• Small comparison (general guidance):

  • Aqueous base developer: High selectivity to exposed positive resist; simple DI water quench; potential metal corrosion.
  • Organic developers (e.g., PGMEA, MIBK/IPA): Used for negative resists and e-beam PMMA; different safety and waste profiles.

Storage and Reconstitution

• Item-specific storage

  • Storage conditions: Room temperature (per Product Data).
  • Shipped in: Normal (per Product Data).

• General storage guidance for aqueous positive PR developers (literature/general):

  • Store tightly closed in compatible, clean containers to prevent CO2 uptake and contamination; many fabs use HDPE or fluoropolymer bottles with cleanroom seals.
  • Protect from extreme temperatures and direct sunlight; avoid freezing, which can change composition and performance of formulated mixtures.
  • If point-of-use filtration is used, replace filters on a defined schedule; purge lines to remove air bubbles before use.
  • Label containers with open date; track bath age/loading and replace per your SPC limits.

• Reconstitution: Not applicable; this product is typically supplied ready-to-use. If concentrates exist, follow the vendor’s dilution instructions with high-purity DI water in a clean environment. No such instructions are specified for this item.

• Shelf life: Not specified for this item; refer to CoA/Spec Sheet.

Always consult the product’s CoA and SDS for definitive storage and handling instructions.

Structure and Identity

Brief description: This product is a formulated developer for positive photoresist (PR) processing in micro/nanolithography.

• Item-specific identifiers

  • Chemical name: Not specified for this item; refer to CoA/Spec Sheet.
  • CAS: Not specified for this item; refer to CoA/Spec Sheet.
  • 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.

• Structural features (general, literature):

  • Positive PR developers in semiconductor processing are typically aqueous alkaline solutions, commonly quaternary ammonium hydroxides (e.g., tetramethylammonium hydroxide, TMAH) or buffered carbonate/silicate systems for certain resists. As formulated mixtures, they do not have a single discrete molecular structure.
  • Functionally, the developer selectively dissolves areas of exposed positive-tone resist by base-catalyzed cleavage or deprotection, increasing solubility of the exposed domains.

• 2D “structure” description (general):

  • For TMAH-based systems (literature), the active base is a small quaternary ammonium cation paired with hydroxide in water; proprietary additives (surfactants, complexants) may be present to control surface tension, metal-ion scavenging, and pattern fidelity. Composition for this item is not specified.

Synthetic Utility

Not applicable as a building block or reagent in bench organic synthesis.

• This product functions as a process chemical for pattern development in lithography.
• It does not provide functional groups or reactive handles for standard named reactions or retrosynthetic disconnections.

For synthetic applications requiring strong base, use defined reagents (e.g., NaOH, KOH, TBAH) with known concentration and purity appropriate to the reaction.

Target Specificity

Not applicable. This product is not a biological targeting agent or antibody and has no antigen/epitope specificity.