ALPHA AL8 Microwave Plasma Cleaner

Overview

The ALPHA AL8 Microwave Plasma Cleaner is an industrial-grade, CE-compliant plasma surface treatment system engineered for precision cleaning, photoresist stripping, and surface activation in semiconductor front-end and back-end processes. Utilizing a 2.45 GHz microwave-driven plasma source with 600 W nominal power output, the AL8 generates high-density, low-damage plasma via electron cyclotron resonance (ECR)-capable excitation—enabling efficient dissociation of process gases without significant ion bombardment energy. Its 18 L aluminum vacuum chamber (250 × 250 × 290 mm) is optimized for uniform plasma distribution and rapid pump-down, supporting wafer-level processing of substrates up to 200 mm diameter. Designed for integration into cleanroom environments (ISO Class 5–7), the system operates under controlled vacuum conditions (base pressure < 1 × 10⁻³ mbar) and accommodates reactive gas chemistries including O₂, CF₄, SF₆, and Ar/O₂ mixtures—critical for residue-free resist removal, native oxide reduction, and post-etch residue mitigation prior to metallization or bonding.

Key Features

• 2.45 GHz microwave plasma generator with stable 600 W power delivery and integrated impedance matching network for consistent plasma ignition and maintenance
• Aluminum chamber with electropolished interior surface, ensuring low outgassing rates and compatibility with aggressive halogen-based chemistries
• Hinged vacuum door with multi-layer fused quartz viewport featuring integrated UV-blocking and microwave-shielding coatings (≥ 60 dB attenuation at 2.45 GHz)
• Digital MKS mass flow controller (MFC) for precise, repeatable gas dosing (±1% full scale accuracy); expandable to four independent gas lines via optional manifold
• Motorized rotating stage (φ200 mm, 0–30 rpm adjustable) enabling uniform exposure across asymmetric or multi-die substrates
• 7-inch industrial-grade capacitive touchscreen HMI running Windows CE OS, supporting recipe storage (≥ 100 protocols), real-time parameter logging, and password-protected user levels
• Modular dry pump package (optional) compliant with ISO 8573-1 Class 0 oil-free air standards, eliminating hydrocarbon contamination risk

Sample Compatibility & Compliance

The AL8 accommodates wafers, reticles, masks, MEMS devices, and ceramic substrates ranging from 50 mm to 200 mm in diameter. Its chamber geometry supports both single-wafer and batch-style loading configurations. All wetting parts are constructed from anodized aluminum and PTFE-sealed components, meeting SEMI F20-0201 requirements for semiconductor tool materials. The system conforms to IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emission) standards, carries CE marking per Machinery Directive 2006/42/EC and EMC Directive 2014/30/EU, and includes hardware-enforced interlocks satisfying EN 60204-1 safety requirements. Optional audit-ready software modules support 21 CFR Part 11-compliant electronic signatures and GLP/GMP traceability when paired with validated dry pump and gas delivery subsystems.

Software & Data Management

The embedded Windows CE platform provides deterministic real-time control of plasma parameters—including forward/reflected power, chamber pressure (via capacitance manometer), gas flow rates, and stage rotation speed—with millisecond-level timestamping. Process recipes include configurable ramp profiles for power, pressure, and gas sequencing. Data export is supported via USB 2.0 and Ethernet (TCP/IP), generating CSV-formatted logs compatible with MES platforms such as CIM300 and FactoryTalk. Optional software add-ons enable automated pass/fail criteria evaluation against user-defined thresholds, SPC charting (X̄/R charts), and secure remote diagnostics via TLS-encrypted VNC sessions—facilitating preventive maintenance planning and regulatory documentation.

Applications

• Photoresist stripping after lithography and etch steps, minimizing substrate damage and metal line erosion
• Removal of organic contaminants and post-chemical-mechanical-polish (CMP) residues from Cu, Co, and Ru interconnect layers
• Surface activation of SiO₂, SiNₓ, and low-k dielectrics prior to ALD or PVD nucleation
• Cleaning of photomasks and EUV mask blanks to reduce defect density in high-NA lithography workflows
• Pre-bond surface conditioning for direct wafer bonding (e.g., Si-Si, SiO₂-SiO₂) and hybrid bonding applications
• MEMS release etch residue removal and stiction mitigation in RF and inertial sensor fabrication

FAQ

What vacuum level can the AL8 achieve with the standard pump configuration?
The base pressure is typically ≤ 5 × 10⁻⁴ mbar using the optional oil-free dry pump; with turbomolecular pumping, pressures below 1 × 10⁻⁶ mbar are attainable.
Is the AL8 compatible with fluorine-based chemistries such as NF₃ or CF₄?
Yes—the aluminum chamber is anodized and sealed with fluorosilicone gaskets, and all internal surfaces are rated for continuous exposure to halogenated gases per ASTM D149 and IEC 60695-2-10.
Can the system be integrated into a factory automation environment?
It supports SECS/GEM communication via RS-232 or Ethernet (SEMI E30/E37 compliant), enabling host-directed job dispatch, status reporting, and alarm handling within 300 mm fab automation frameworks.
Does the rotating stage support load-lock or cassette-to-cassette transfer?
The standard configuration is manual loading; however, the mechanical interface and footprint are designed to accommodate third-party load-port integration per SEMI E47 specifications.
What calibration and qualification documentation is provided upon delivery?
Each unit ships with a Factory Acceptance Test (FAT) report, vacuum leak test certificate (≤ 1 × 10⁻⁹ mbar·L/s He), and plasma uniformity mapping data (±5% power density variation across 150 mm zone).