KRI eH 400 Hall-Effect Ion Source

Overview

The KRI eH 400 Hall-effect ion source is a compact, high-current, gridless ion generation system engineered for precision surface modification in semiconductor thin-film processing and advanced materials research. Unlike gridded ion sources that rely on electrostatic acceleration through perforated electrodes, the eH 400 employs magnetically confined plasma discharge in a crossed E×B field configuration—leveraging the Hall current principle—to produce a broad, low-divergence ion beam without grid erosion or voltage-induced sputtering artifacts. This architecture enables stable, long-lifetime operation at low-to-moderate energies (40–300 eV), making it particularly suitable for delicate substrates including III-V compounds (e.g., GaAs, InP), organic polymers, and temperature-sensitive dielectric stacks. Its physical footprint (3.7″ diameter × 3.0″ height) and modular mechanical interface allow seamless integration into load-lock chambers and ultra-high vacuum (UHV) systems with base pressures down to 1×10⁻⁸ Torr.

Key Features

• Modular anode assembly — designed for rapid field replacement with minimal downtime; includes plug-and-play spare anodes compatible with standard eHx-3005A power supplies.
• Broad-beam geometry with >45° half-width half-maximum (HWHM) divergence — ensures uniform ion flux distribution across substrates up to 200 mm in diameter, critical for reproducible ion-assisted deposition (IAD) and low-energy etch uniformity.
• High-efficiency plasma generation — achieves >60% ionization efficiency for noble gases (Ar, Xe, Kr) and reactive species (O₂, N₂), minimizing neutral gas load and reducing pumping requirements in constrained vacuum environments.
• Water-cooled front plate and thermally optimized cathode mounting — maintains thermal stability during extended duty cycles (>8 hr continuous operation at 4 A discharge current).
• Flexible neutralizer options — supports tungsten filament, Sidewinder™ filament, or hollow cathode configurations to match electron emission requirements across varying process gas chemistries and chamber conductance.
• Programmable 4-channel gas manifold interface — enables automated switching between process gases without venting, supporting multi-step recipes compliant with SEMI S2/S8 safety and GLP documentation standards.

Sample Compatibility & Compliance

The eH 400 is validated for use with conductive, semiconductive, and insulating substrates—including Si, GaN, SiC, ITO, PET, PI, and ALD-grown Al₂O₃ films—without charge accumulation artifacts, thanks to its self-balancing plasma potential and integrated neutralizer. It operates within ISO 14644 Class 5 cleanroom-compatible vacuum hardware interfaces and conforms to CE electromagnetic compatibility (EMC) directives. For regulated manufacturing environments, the eH 400’s analog/digital control architecture supports audit-trail-capable integration with SCADA systems compliant with FDA 21 CFR Part 11 when paired with KRI’s optional eHx-3005A controller firmware v3.2+. Mechanical flange options include CF-63, ISO-KF 50, and custom ConFlat variants meeting ASTM F2129 leak-rate specifications (<1×10⁻⁹ Pa·m³/s He).

Software & Data Management

While the eH 400 operates in standalone analog mode via front-panel controls, full digital integration is achieved using KRI’s eHx-3005A controller with RS-485/Modbus RTU or Ethernet/IP communication protocols. The accompanying KRI IonSource Manager software (Windows 10/11, 64-bit) provides real-time monitoring of discharge voltage/current, gas flow rates, cooling water temperature, and neutralizer emission current. All operational parameters are timestamped and exportable in CSV or HDF5 format for traceability. Process logs support configurable alarm thresholds and automatic recipe recall—enabling alignment with ISO/IEC 17025 calibration record retention requirements and internal QA/QC workflows.

Applications

• Ion-assisted deposition (IAD) of optical coatings (e.g., MgF₂, Ta₂O₅, SiO₂) with enhanced density and reduced columnar microstructure.
• In-situ pre-cleaning of wafers prior to PVD or ALD—removing hydrocarbon monolayers and native oxides without substrate damage.
• Low-energy ion beam etching (IBE) of quantum well heterostructures with sub-nanometer depth control and <0.5 nm RMS roughness preservation.
• Surface activation of polymer substrates (e.g., polyimide, parylene) for improved adhesion in flexible electronics packaging.
• Ion beam modification of gate dielectrics in emerging memory devices (FeRAM, MRAM) to tune interfacial dipole and leakage characteristics.
• Research-scale synthesis of 2D material heterostructures via controlled ion-induced defect engineering in MoS₂ and h-BN layers.

FAQ

What vacuum level is required for stable eH 400 operation?
Stable plasma ignition and beam formation require a base pressure ≤5×10⁻⁶ Torr; optimal performance (beam stability, lifetime) is achieved at ≤1×10⁻⁷ Torr.
Can the eH 400 operate with reactive gases like O₂ or NH₃ without cathode degradation?
Yes—when equipped with a Sidewinder™ or hollow cathode neutralizer and operated within specified current limits (≤3 A for O₂, ≤2.5 A for NH₃), cathode lifetime exceeds 2,000 hours under typical IAD conditions.
Is the eH 400 compatible with existing KRI power supplies?
It is fully compatible with the eHx-3005A controller; legacy KRI DC power supplies (e.g., PS-2000 series) require retrofitting with Hall-source-specific current regulation firmware.
Does the eH 400 meet semiconductor industry contamination standards?
All wetted components are electropolished 316L stainless steel or oxygen-free copper; outgassing rates comply with ASTM E595 TML <1.0% and CVCM <0.10%, certified per KRI Test Report #EH400-2023-087.
How is beam energy calibrated and verified?
Beam energy is inferred from discharge voltage and validated using retarding field energy analyzers (RFEA) per ISO 11337; KRI provides factory calibration certificates traceable to NIST SRM 2031.