Allresist AR-N 4400 Positive Tone Chemically Amplified Photoresist
| Brand | Allresist |
|---|---|
| Origin | Germany |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | AR-N 4400 |
| Pricing | Available Upon Request |
Overview
Allresist AR-N 4400 is a high-performance, positive-tone, chemically amplified photoresist engineered for advanced microfabrication processes in semiconductor R&D, MEMS, micro-optics, and precision electroplating applications. Unlike conventional novolac-diazonaphthoquinone (DNQ) resists, AR-N 4400 employs a thermally activated acid-catalyzed deprotection mechanism, enabling exceptional sensitivity across multiple exposure modalities—including broadband UV (g- and i-line), electron beam (e-beam), soft X-ray, and synchrotron radiation. Its formulation delivers high contrast, sub-micron resolution, and excellent etch resistance when paired with standard plasma or wet etchants—making it particularly suitable for demanding lift-off, LIGA, and deep-UV lithography workflows where structural fidelity and sidewall verticality are critical.
Key Features
- Multi-Modal Exposure Compatibility: Optimized for g-line (436 nm), i-line (365 nm), broadband UV, e-beam (10–100 keV), and synchrotron-based X-ray lithography—enabling seamless transition between mask aligner, stepper, and direct-write platforms.
- High Aspect Ratio Capability: Supports uniform spin-coated films from ~1 µm to >100 µm thickness with minimal thickness variation (<±3% across 100 mm wafers), maintaining mechanical integrity during development and subsequent processing.
- Steep Sidewall Profile & Undercut Control: Engineered to yield near-vertical profiles (>88° wall angle) and controllable undercut geometry—critical for high-fidelity metal lift-off and sacrificial layer release in multilayer device fabrication.
- Superior Etch Resistance: Demonstrates >5× higher resistance to CF4/O2 plasma etching compared to standard PMMA resists and comparable performance to SU-8 in oxygen plasma—without requiring post-bake crosslinking.
- Chemical Amplification Mechanism: Utilizes a sulfonium salt photoacid generator (PAG) and acid-labile protecting groups, achieving high sensitivity (≤10 mJ/cm² for i-line, ≤100 µC/cm² for e-beam) while preserving thermal stability up to 120 °C pre-exposure.
Sample Compatibility & Compliance
AR-N 4400 is compatible with standard silicon, glass, quartz, metal (Ti, Cr, Au, Cu), and ceramic substrates. It adheres robustly following HMDS vapor priming or O2 plasma surface activation. The resist is formulated without halogenated solvents and complies with RoHS Directive 2011/65/EU and REACH Annex XVII restrictions. While not classified as a GMP-grade material, its lot-to-lot consistency (verified via FTIR and DSC batch certification) supports reproducible process qualification under ISO 9001-certified manufacturing conditions. Documentation includes CoA (Certificate of Analysis), SDS (Safety Data Sheet), and lot-specific spectral absorption data.
Software & Data Management
As a consumable photoresist—not a standalone instrument—AR-N 4400 does not include embedded firmware or proprietary software. However, its process parameters are fully integrable into industry-standard lithography workflow management systems (e.g., ASML LithoTools, EVG SmartView, or open-source lithography simulation suites such as PROLITH and MEEP). Exposure dose calibration, post-apply bake (PAB) ramp profiling, and development time optimization can be logged and audited within laboratory information management systems (LIMS) compliant with 21 CFR Part 11 requirements when used in regulated environments (e.g., medical device MEMS production).
Applications
- High-resolution lift-off metallization for RF MEMS and superconducting circuits
- Deep X-ray lithography (LIGA) for high-aspect-ratio microstructures (e.g., microfluidic nozzles, gear trains, optical waveguides)
- Electroplating molds and sacrificial templates in Ni, Cu, and CoFe alloy deposition
- Mask fabrication for nanoimprint lithography (NIL) stamp replication
- Hybrid integration of III-V semiconductors on Si platforms requiring low-stress, high-selectivity patterning
- Research-scale e-beam lithography for quantum dot arrays and plasmonic metasurfaces
FAQ
Is AR-N 4400 compatible with standard semiconductor cleanroom processes?
Yes—it is formulated for compatibility with Class 100/ISO 5 cleanroom handling, including filtration through 0.2 µm PTFE membranes and dispense via stainless-steel or fluoropolymer-coated syringes.
What developer is recommended for AR-N 4400?
Allresist recommends AR 300-26 (TMAH-based, 2.38 wt%) for optimal contrast and linewidth control; alternative developers (e.g., NaOH or KOH aqueous solutions) may be used but require re-qualification.
Can AR-N 4400 replace SU-8 in thick-film applications?
Yes—particularly where thermal budget constraints, undercut control, or avoidance of epoxy-based crosslinking chemistry is required. However, SU-8 remains preferred for applications demanding extreme mechanical rigidity post-cure.
Does AR-N 4400 require a post-exposure bake (PEB)?
Yes—PEB at 90–100 °C for 60–90 seconds is mandatory to drive acid diffusion and complete deprotection; omission results in incomplete development and reduced sensitivity.
How should AR-N 4400 be stored?
Store unopened bottles at 2–8 °C in the dark; shelf life is 12 months from manufacture date. Once opened, use within 4 weeks under nitrogen purge and refrigerated conditions.
