| HS Code | 472205 |
| Product Name | NAR-1000 |
| Manufacturer | Nanda Optoelectronic Material Co., Ltd. |
| Photoresist Class | ArF photoresist |
| Exposure Wavelength | 193 nm |
| Resist Tone | Positive tone chemically amplified resist |
| Recommended Developer | 2.38 wt% aqueous TMAH solution |
| Primary Solvent | Propylene glycol methyl ether acetate (PGMEA) |
| Resolution Capability | 90-130 nm pattern features |
| Typical Film Thickness | 200-500 nm |
| Storage Condition | 2-8 °C, protected from ultraviolet light |
| Shelf Life | 6 months from date of manufacture |
As an accredited ArF Photoresist Nanda Optoelectronic NAR-1000 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 4-liter amber HDPE bottles with PTFE-lined caps, nitrogen-blanketed for stability, and shipped in light-protective cartons. |
| Container Loading (20′ FCL) | 20′ FCL: ArF photoresist NAR-1000 packed in sealed, inert containers; upright secured, temperature-controlled, protected from light, per hazmat protocol. |
| Shipping | ArF Photoresist Nanda NAR-1000 is a flammable, light-sensitive chemical solution requiring ambient-temperature transport. Ship in tightly sealed, opaque HDPE containers, upright and cushioned to prevent leakage. Ground shipment preferred unless compliant air/sea dangerous-goods approvals exist. Classify as UN1993 Flammable Liquid, n.o.s., Class 3, PG II/III with proper shipping documentation, labels, and segregation from oxidizers and ignition sources. |
| Storage | Store ArF Photoresist NAR-1000 in its original, tightly sealed container in a cool, dry, well-ventilated area. Maintain a stable temperature between 2–8°C, away from direct sunlight, UV light, heat, and ignition sources. Keep upright to prevent leakage. Avoid unnecessary opening to prevent contamination or solvent evaporation. Handle with appropriate PPE and follow manufacturer guidelines. |
| Shelf Life | Shelf life is typically 6–12 months when stored unopened in original containers under recommended cool, dark conditions. |
In front-end-of-line gate and fin patterning for advanced logic, Nanda Optoelectronic NAR-1000 is introduced directly from a bulk chemical cabinet through 0.01 µm point-of-use filtration to the dispense pump; no letdown solvent is added, and the point-of-use addition ratio is maintained at 100:0 by mass NAR-1000 to diluent. The developer is prepared from 25 wt% tetramethylammonium hydroxide concentrate blended with deionized water at a 1:9.5 mass ratio to produce 2.38 wt% 0.26 N aqueous developer. Coating and development are performed in a cleanroom environment conforming to ISO 14644-1:2015 Class 1 at point-of-use; track and scanner equipment are assessed under SEMI S2-0718 and SEMI S8-0716, with exposure tool voltage sag immunity managed per SEMI F47-0706. After hexamethyldisilazane prime and spin-on carbon underlayer, NAR-1000 is spin-coated to a film thickness in the 80 nm to 120 nm range, baked at 110 °C to 130 °C for 60 s to 90 s, exposed using a 193 nm immersion scanner with numerical aperture up to 1.35, given a post-exposure bake at setpoint ±0.5 °C, and developed with a single puddle for 30 s to 60 s. The downstream production sequence continues with CD-SEM and optical critical dimension measurement, gate hardmask etch, and inner-spacer deposition in gate-all-around integration. Terminal finished product types are mobile application processors, desktop CPUs, GPUs, and custom AI accelerator dies fabricated at 7 nm/5 nm-class nodes where ArF immersion layers remain in production for critical FEOL levels.
Line-width roughness and pattern collapse dominate process capability in this scenario. At film thickness below 100 nm, the transition to collapse-limited design rules is observed on 300 mm wafers when rinse meniscus forces exceed the mechanical strength of the imaged resist; batch-to-batch variance in NAR-1000 adhesion to the spin-on carbon underlayer is therefore controlled by upstream dehydration baking and hexamethyldisilazane conditions rather than by post-exposure dose compensation alone. Published data for this specific configuration is limited, so the consuming fab must verify the resist contrast curve and etch selectivity against the actual hardmask stack before release to production.
Via-first copper/low-k integration imposes separate constraints on NAR-1000 because the via-level resist is coated over a titanium nitride hardmask or a spin-on glass planar layer above a porous low-k dielectric. The applicable compliance framework includes SEMI S2-0718 for coater/developer chemical safety, IEC 61340-5-1 for electrostatic discharge control, and REACH Regulation (EC) No 1907/2006 for solvent and photoacid generator substance registration. The resist is used undiluted; the only downstream mixing ratio is the diluent addition permitted for point-of-use pump purging, which is 0 wt% to 3 wt% of propylene glycol monomethyl ether acetate relative to NAR-1000. No photoacid generator or quencher spiking is permitted because it shifts iso-dense bias outside the allowed process window. The production sequence includes spin-coating the via-level resist at 120 nm to 180 nm, softbake at 100 °C to 130 °C, via exposure, post-exposure bake, development, and then trench-level coat. Terminal product types in this segment are network switch ASICs, high-bandwidth memory controller logic, and PCIe switching devices fabricated at 28 nm/22 nm and below, where dual damascene copper/low-k integration requires tight via-size retention after reactive ion etch.
Via-to-trench bias is set by the acid diffusion length during post-exposure bake and by the development inhibitor concentration. On production tracks, developer temperature is held at 23 °C ±0.5 °C; a deviation larger than this reduces critical dimension uniformity beyond 1.5 nm across a 300 mm wafer in via-first stacks. The coater cup exhaust balance and edge-bead-remover delivery are additional constraints, because redeposited resist mist at the wafer edge transfers into the developer puddle and creates a local surface tension shift at the via-to-trench boundary. Post-develop rinse uses deionized water followed by spin-dry under nitrogen with an oxygen concentration below 1 vol% to prevent pattern collapse of high-aspect-ratio via features.
For DRAM capacitor formation, NAR-1000 serves as the imaging layer in a multilayer stack above sacrificial spin-on carbon and silicon oxynitride hardmask. The cleanroom and equipment compliance baseline is ISO 14644-1:2015 Class 1, SEMI S2-0718, SEMI S8-0716, and RoHS Directive 2011/65/EU as amended by (EU) 2015/863 for terminal component compliance. The addition ratio is not a masterbatch dilution: NAR-1000 is dispensed at 100:0 by mass as supplied, while the developer is maintained at 2.38 wt% TMAH without pH buffering agents. In this segment, the critical thickness ratio is the resist-to-spin-on-carbon stack ratio of 1:3 to 1:5, because the resist is deliberately thinned to 80 nm to 110 nm over a sacrificial carbon layer to enable high-aspect-ratio contact etch. The wafer passes through softbake at 110 °C to 130 °C, 193 nm exposure, post-exposure bake, and puddle development; the storage node contact holes are then etched through the carbon layer and underlying oxide. Process control focuses on contact critical dimension uniformity under 1.2 nm across the wafer, because even a few nanometers of CD shift changes cell capacitance and row/column margin. Terminal finished product types are DDR5 SDRAM, LPDDR5X mobile DRAM, and high-bandwidth memory stacks used in servers and AI accelerators.
Peripheral CMOS layers under three-dimensional NAND arrays present a different lithographic boundary condition because the resist must cover a highly warped wafer after multiple layer stacking. NAR-1000 is coated at 110 nm to 150 nm over the stack, with point-of-use addition ratio held at 100:0 and only temperature-controlled viscosity adjustment; developer dilution remains 1:9.5 by mass from 25 wt% TMAH concentrate to 2.38 wt%. Equipment compliance is governed by SEMI S2-0718 and SEMI F47-0706, while cleanroom air cleanliness follows ISO 14644-1:2015 Class 2. The sequence is spin-coat, softbake at 100 °C to 120 °C, dry 193 nm or immersion exposure depending on the periphery node, post-exposure bake, and development with surfactant-free developer. The main production bottleneck is not resolution but total thickness variation and slot-plate CD non-uniformity after auto-focus on warped wafers; without a pre-coat planarizing layer, the depth of focus window collapses below 100 nm. Terminal finished product types include 232-layer and higher 3D NAND memory die used in enterprise SSDs, client SSDs, and removable flash storage.
For mixed-signal and RF foundry processes migrating from 28 nm to 22 nm nodes, NAR-1000 serves as the 193 nm imaging layer over a silicon anti-reflective coating and spin-on carbon trilayer. The applicable product qualification standard is AEC-Q100 for automotive-grade integrated circuits, while manufacturing equipment safety follows SEMI S2-0718; chemical registration obligations are addressed under REACH Regulation (EC) No 1907/2006 and the terminal component must conform to RoHS Directive 2011/65/EU. The addition ratio for the resist is 100:0 as supplied; no post-synthesis additive is introduced, and the only process blending step is the developer dilution from 25 wt% TMAH concentrate to 2.38 wt% at 1:9.5 by mass. A filter of 0.01 µm is used before dispense because particle agglomeration in the dispense line changes local dose absorption. The downstream production sequence runs through spin-coat, softbake at 120 °C for 70 s, 193 nm exposure, post-exposure bake with temperature control ±0.5 °C, puddle develop, and etchback. Terminal product types are automotive MCUs, RF transceivers, and power management ICs used in battery-electric vehicle inverters, advanced driver-assistance systems, and smartphone front-end modules.
In mixed-signal transfer, the primary resist-related risk is iso-dense bias on isolated gate lines next to dense arrays. The consuming fab shall monitor post-develop line-end pullback with scanning electron microscopy and compare to the dense-array CD; if the bias exceeds 2.0 nm, rework is required before hardmask open. Published public data for NAR-1000 under this specific stack configuration is limited, so process qualification must be performed on a wafer-to-wafer basis until a stable contrast curve is obtained.
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Nanda Optoelectronic NAR-1000 is an ArF photoresist intended for 193 nm lithographic patterning in semiconductor manufacturing. The product is supplied as a filtered liquid resist for spin-coat tracks, and the model designation places it in the class of chemically amplified ArF formulations rather than older i-line or KrF resist platforms. Product-specific certified limits for viscosity, film thickness, metal impurities, photospeed, and storage stability are not reproduced in this document because the lot-level certificate of analysis was not available in the source data. The numerical values discussed below are therefore class-typical values for 193 nm ArF photoresists or general process ranges reported for comparable production materials; they are not a substitute for the NAR-1000 release certificate.
In production use, the material is coated onto 200 mm or 300 mm silicon wafers, baked, exposed on a 193 nm excimer laser scanner, post-exposure baked, and developed in aqueous tetramethylammonium hydroxide. Typical process conditions for ArF resists include spin speeds of 1500 rpm to 3000 rpm, soft-bake temperatures of 90 °C to 130 °C for 60 s to 90 s, and post-exposure bake temperatures of 90 °C to 130 °C for 60 s to 90 s. The developer is commonly 2.38 wt% tetramethylammonium hydroxide applied as a single puddle for 30 s to 60 s. NAR-1000-specific bake windows must be obtained from the manufacturer’s technical datasheet and confirmed by CD measurement on the target film stack.
ArF photoresists such as NAR-1000 operate by a chemically amplified mechanism. Photoacid generator absorbs 193 nm radiation and releases a catalytic acid, which deprotects the polymer during post-exposure bake. Because the acid is catalytic, small differences in bake temperature, bake time, and exposure dose are amplified into measurable critical dimension variation. On production tracks, the dominant process window limitation is usually post-exposure bake temperature uniformity. Reported screening data for ArF platforms frequently place CD sensitivity at 1 nm/°C to 2 nm/°C for isolated and dense line patterning. When the total CD budget is 3 nm to 5 nm, a hotplate centre-to-edge temperature range above 2 °C can consume the entire across-wafer CD budget before exposure dose errors are considered. NAR-1000 should therefore be qualified on a proximity hotplate with independent centre, middle, and edge thermocouples, and the PEB temperature setpoint should not be released until the measured plate uniformity is below 0.3 °C at the target temperature.
Post-exposure delay is a separate process conflict. After exposure, the photoacid can be neutralized by airborne amine contamination or by substrate outgassing. The result is a surface-insoluble layer that produces T-shaped profiles in dense line/space patterns. Production coater/developer bays with carbon-filtered air and point-of-use chemical filtration maintain amine concentrations below 5 ppb, but older tracks or modules using certain epoxy-coated cleanroom panels may exceed this level. If NAR-1000 exhibits T-topping at delays above 5 min, the user should verify the exposure-to-PEB transfer time, the track’s chemical filtration, and the reticle storage environment rather than assuming the resist itself is defective. Published data for this specific configuration is limited; the delay tolerance must be measured on the production track.
Film thickness optimization is another critical threshold. ArF resists show reflectivity-driven swing behaviour because the substrate stack under a thin resist film reflects light at 193 nm and modulates the absorbed dose. A swing curve is generated by coating wafers at multiple spin speeds, exposing, and measuring dose-to-size or CD through focus. Target film thickness is usually set at a reflectivity minimum for the production substrate stack, often with an antireflective underlayer. If the stack includes silicon nitride, polysilicon, or other dielectric layers, the optimal thickness for NAR-1000 changes and cannot be inferred from a bare-silicon wafer qualification. For ArF resists, a coating uniformity of 3σ ≤ 1.5 nm across a 300 mm wafer is commonly required to keep the wafer edge from falling outside the CD budget; this is an experience value from production coater/developer tracks, not a NAR-1000 release limit.
Photoacid generator loading creates a trade-off among photospeed, contrast, and outgassing. If the PAG concentration is increased, dose-to-size drops but acid diffusion and volatile organic outgassing during exposure may rise. Production ArF formulations are commonly designed with quencher diffusion control to keep acid blur within the resist resolution budget; the NAR-1000 acid diffusion length is not published in the source data and should be measured from the slope of CD versus PEB temperature on the target stack. At dimensions near the scanner resolution limit, the resist response is not governed solely by exposure dose. A trade-off among linewidth roughness, sensitivity, and resolution is observed in ArF screening matrices. Reducing photoacid diffusion lowers linewidth roughness but raises dose requirements; increasing PEB temperature lowers dose but can enlarge acid blur and reduce process window. NAR-1000 should be evaluated with a focus-exposure matrix that includes ±0.15 µm focus steps and 2% dose steps across the production reticle. If the overlapping depth of focus is below 0.20 µm, the resist is not suitable for the target layer without an underlying antireflective stack change or scanner adjustment.
Compared with i-line DNQ-novolac systems, NAR-1000 and other 193 nm ArF resists do not rely on diazonaphthoquinone dissolution inhibition. The contrast is generated by acid-catalysed deprotection during PEB, and the polymer architecture is non-aromatic to maintain transparency at 193 nm. The removal of aromatic rings has a process consequence: many ArF resists show lower intrinsic etch resistance to fluorocarbon plasma than KrF poly(hydroxystyrene) resists. Critical layers are therefore transferred through a hard mask or thinned resist layer, and the etch selectivity of NAR-1000 should be evaluated on the actual etch platform before design rule release.
Compared with KrF resists, ArF platforms use a shorter exposure wavelength, which increases resolution but reduces depth of focus at a given critical dimension. A patterned layer that is non-critical at 248 nm may move into a focus-limited regime at 193 nm if no optical proximity correction is applied. In practice, replacement of a KrF resist with NAR-1000 on the same track requires not only coating and develop condition changes but also reticle bias, illumination mode, and substrate stack review. Table 1 summarizes class-typical differences across resist generations; the NAR-1000 column should be considered a representative ArF class and not a product-specific release table.
| Parameter | i-Line (365 nm) | KrF (248 nm) | ArF (193 nm) including NAR-1000 |
|---|---|---|---|
| Primary polymer system | DNQ-novolac | protected poly(hydroxystyrene) | cycloolefin-methacrylate or cycloaliphatic copolymer |
| Aromatic absorption at exposure wavelength | high; optical exposure confined to upper film | moderate | low; non-aromatic backbone required |
| Typical film thickness | 1.0 µm–3.0 µm | 300 nm–1000 nm | 80 nm–250 nm |
| Development mechanism | DNQ dissolution inhibition | acid-catalysed deprotection | acid-catalysed deprotection with shorter acid diffusion |
| Etch resistance | high aromatic content | moderate to high | lower; hard-mask transfer commonly used |
| Typical production dose | 30 mJ/cm²–80 mJ/cm² | 15 mJ/cm²–45 mJ/cm² | 15 mJ/cm²–35 mJ/cm² |
| Coating uniformity requirement | derived from i-line focus latitude | 3σ ≤ 2 nm–3 nm | 3σ ≤ 1.5 nm on 300 mm tracks |
When NAR-1000 is used on an immersion scanner, the user must confirm whether the formulation is topcoat-free or requires a topcoat. In topcoat-requiring ArF resists, immersion water extracts photoacid generator and base quencher, causing photospeed drift and defect formation. Production splits on an ASML TWINSCAN NXT-class immersion tool should include pre-exposure and post-exposure defect inspection on a brightfield wafer inspection system. If NAR-1000 is qualified as a dry 193 nm resist, immersion compatibility testing is not required, but the same filtration and amine-control practices still apply.
From a track perspective, replacing an i-line or KrF resist with an ArF resist changes the thermal budget because the soft-bake and PEB temperatures for ArF resists are often lower than DNQ-novolac bakes, but the sensitivity to temperature error is higher. Existing hotplates with built-in overshoot above 1 °C during ramp-up may be acceptable for thick i-line resist but can induce CD nonuniformity in ArF chemically amplified films. Track qualification for NAR-1000 should include a hotplate transient waveform check with a wireless wafer-level temperature logger. The steady-state setpoint alone does not capture the ramp overshoot that affects acid generation and deprotection near the resist bottom interface.
Viscosity is the first release parameter that affects coat thickness. For ArF resists, dynamic viscosity at 25 °C is commonly measured by cone-and-plate viscometry according to ASTM D4287. Class-typical ArF resist viscosities fall between 1.0 cP and 10.0 cP; NAR-1000 lot-specific values should appear on the certificate of analysis. Batch-to-batch viscosity shifts of ±0.2 cP are sufficient to alter film thickness by several nanometres at a fixed spin speed, and high-volume production tracks often incorporate a spin-speed trim table to hold final film thickness within ±2 nm of the target.
Trace metal control is critical because metal impurities in a photoresist can degrade gate oxide integrity and reduce minority carrier lifetime. Advanced ArF resists are filtered through 0.05 µm point-of-use filters and are supplied with metal limits in the low parts-per-billion range. Common specifications for ArF class materials set sodium, potassium, calcium, iron, and copper individually below 10 ppb by inductively coupled plasma mass spectrometry. The NAR-1000 CoA should provide the exact element list and reporting basis; if the CoA reports only total metals, total trace metals should be below 10 ppb unless the user’s device technology allows a higher ceiling. Filtration at dispense is also used to remove particle contamination above 0.2 µm. Production tracks should verify that the filter is compatible with the solvent system in NAR-1000 to avoid extractables that can raise background dark erosion or create microbridge defects in high-resolution patterns.
Water content and dark erosion are additional quality markers. ArF resists are sensitive to moisture because water can hydrolyse the photoacid generator or alter polymer solubility. If moisture ingress raises water content above 100 ppm without detection, the resist may show post-apply thickness loss or CD drift. The lot should therefore be stored in sealed, light-tight containers at 5 °C to 25 °C, and any dispense line should be closed-loop or blanketed with nitrogen. If the cleanroom bay operates above 60% relative humidity, wafer surface pre-drying is advisable before coating to prevent microvoids and adhesion loss at the resist–BARC interface.
For lot acceptance, the incoming quality control laboratory may measure film thickness on a bare silicon monitor wafer after softbake, exposure dose by contrast curve, and dark erosion in the production developer. A change in film thickness of ±2 nm against the retained reference lot is commonly used as an alarm limit; a change in dose-to-size of ±5% may require adjustment of the scanner dose or a lot return. Because the NAR-1000 CoA may report a narrower or wider alarm limit depending on the customer specification, the manufacturing site should align internal incoming inspection limits with the technology owner’s CD-control plan and not with an unrelated ArF product.
Before a lot of NAR-1000 is qualified for production, the coater/developer programme is typically run with a minimum of 25 wafers to establish mean film thickness, within-wafer uniformity, defect density after develop, and dose-to-size stability. The qualification demand includes an edge-bead removal check because incomplete EBR dissolution at the wafer edge can redeposit resist debris on the hotplate or transfer to the developer nozzle. Observed failure modes on high-volume tracks include re-deposited edge beads during the post-apply bake transition, intermittent dispense bubbles caused by low supply-line pressure, and polymer precipitation when the resist is held in stainless-steel pressure pots for extended periods. Stainless-steel wetted parts are not always compatible with ArF resist solvents; polytetrafluoroethylene or high-density polyethylene wetted lines are preferred unless the manufacturer’s chemical compatibility sheet states otherwise.
Storage and handling controls for NAR-1000 should include protection from ultraviolet light and from free-radical sources. ArF resists are not usually classified as free-radical curing monomers, but the photoacid generator can undergo slow thermal decomposition if the container is left near a hotplate or inside a bake cabinet. If the product is stored above 25 °C for more than 72 h, a photospeed check against a retained reference lot is required before running production wafers. The operational boundary is therefore set by the user’s incoming inspection programme rather than by visual inspection alone. Incompatible cleanroom materials include uncontrolled amine-bearing sealants and some polyurethane hoses that outgas ammonia; if these are present on the coater/developer enclosure, the resist may show CD instability or T-topping even when the scanner and developer are within specification. NAR-1000 is intended for semiconductor lithography only and is not formulated for UV-ink or microelectromechanical systems release processes.
