The IA-Series Ion-Assisted Thin Film Deposition Equipment integrates electron-beam thermal evaporation with a Kaufman or End-Hall ion source. Energetic ion bombardment (argon/oxygen mix) during deposition transfers momentum to adatoms, eliminating columnar voids, suppressing moisture absorption, and stabilizing refractive indices. Designed for high-precision R&D and continuous production, the stainless-steel chamber maintains a base pressure below 5 x 10^-6 Pa to deliver dense, stoichiometric thin films for optics, sensors, and semiconductors.
Technical Specifications
|
Parameter |
Specification Details |
|
Chamber Dimensions |
Phi 800 mm x 700 mm (Customizable up to Phi 1200 mm) |
|
Base Pressure |
<= 5.0 x 10^-6 Pa (Achieved within 40 minutes from atmosphere) |
|
Working Pressure |
1.0 x 10^-2 Pa to 8.0 x 10^-1 Pa |
|
Evaporation Sources |
Multi-pocket e-gun (6 x 15 cc or 4 x 40 cc) with sweep control |
|
Ion Source Type |
Grid-based Kaufman / End-Hall (Ion energy: 50 - 1500 eV) |
|
Substrate Fixture |
Planetary rotation (0 - 25 RPM) with heater (RT - 350 deg.C) |
|
Thickness Control |
Dual-channel quartz crystal monitor (QCM) / Optical monitoring option |
|
Pumping System |
Magnetic levitation turbomolecular + Roots + rotary vane backing pump |
Key Features
Microstructure Densification: Concurrent ion bombardment raises packing density near bulk values by collapsing grain boundaries.
Intrinsic Stress Control: Adjustable ion-to-atom arrival ratios prevent film delamination on brittle substrates (silicon, germanium, fused silica).
Enhanced Adhesion: Pre-cleaning via ion etching removes native oxides and surface contaminants prior to deposition.
Closed-Loop Automation: PLC architecture automates vacuum sequencing, shutter actuation, power ramping, and gas MFCs.
Thermal Isolation: Water-cooled chamber walls and radiation shields protect substrates from e-beam hearth radiation.
Vacuum System Configuration
High-Vacuum Pump: Magnetic levitation turbomolecular pump (1600 L/s for N2) for oil-free operation.
Roughing Stage: Direct-drive rotary vane paired with a Roots blower for rapid crossover.
Sealing & Valves: Pneumatic gate valves with Viton/Metal bakeout-rated seals.
Interlocks: Pirani and cold cathode gauges integrated with overpressure protection circuits.
Materials Compatibility
Evaporation Materials:
Oxides (SiO2, Ta2O5, TiO2, Nb2O5)
Fluorides (MgF2, YF3)
Refractory metals (Ti, Cr, Al)
Substrate Materials:
Fused silica, optical glass, ZnSe, silicon wafers, GaAs, stainless steel.
Applications
Precision Optics: Anti-reflective coatings, bandpass filters, and high-reflectivity mirrors for laser and DWDM telecommunication systems.
IR Windows: Protective, durable anti-reflective films on germanium and silicon thermal imaging optics.
Semiconductors: Dielectric insulating films and metal contact passivation layers.
Optoelectronics: Transparent conductive oxide layers for sensor arrays and flat panels.
Customization Options
Chamber Geometry: Tailored envelope dimensions for specialized production jigs or large-format optics.
Source Integration: Dual e-gun configurations, thermal resistance boats, or reactive thermal cracking sources.
Automation: SECS/GEM-compliant lights-out manufacturing software packages.
Substrate Fixtures: Custom holders for curved lenses, micro-prisms, or 300 mm wafers.
Quality Control & Factory Testing
Compliance Standards: Built to CE and SEMI S2/S8 cleanroom guidelines.
Leak Detection: Helium mass spectrometer testing on all welds (leak rate <= 1 x 10^-10 Pa*m^3/s).
Burn-In: 72-hour continuous dry run of mechanical feedthroughs and interlocks.
Uniformity Verification: Spectrophotometric analysis verifying thickness distribution within +/- 1% across the holder.
Installation, Lead Time & Technical Support
Delivery Timeline: Standard manufacturing, FAT, and crating lead time is 16 to 20 weeks from technical sign-off and deposit.
Site Preparation: Comprehensive utility manual provided beforehand (specifying chilled water flow, 380V power, and compressed air).
Commissioning: On-site installation, calibration, and process tuning by senior field engineers.
Lifecycle Support: Locally stocked critical spare parts (filaments, quartz crystals, seal kits) for fast dispatch.
Frequently Asked Questions
Q: What is the maintenance interval for the ion source grid?
A: Grid cleaning and filament replacement occur every 150 to 300 operational hours, depending on reactive gases. Quick-release designs allow swaps in under 30 minutes.
Q: How does ion-assisted deposition (IAD) impact optical coatings?
A: IAD eliminates moisture shifts by collapsing columnar structures. For example, SiO2 films retain a stable refractive index of 1.46 in humid environments.
Q: Are reactive gas processes safely managed?
A: Yes. Mass flow controllers regulate O2 or N2 injection directly into the ion source, backed by automatic shut-off safety valves and purge cycles.
Q: What are the utility requirements?
A: Chilled cooling water (>= 50 L/min, 18 - 22 deg.C), compressed air (0.4 - 0.6 MPa), and dedicated 3-phase electrical feeds.
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