KRi RFICP-380 Large-Area Radio Frequency Ion Source

Overview

The KRi RFICP-380 is a high-performance, large-area radio frequency inductively coupled plasma (RF-ICP) ion source engineered for precision ion beam processing in advanced semiconductor, MEMS, and optoelectronic manufacturing environments. Unlike thermionic cathode-based ion sources, the RFICP-380 employs electrodeless RF excitation at 1.8 MHz to generate high-density, stable plasma within a water-cooled discharge chamber—eliminating filament degradation and enabling extended, uninterrupted operation in high-reliability vacuum processes. Its 38 cm diameter three-grid extraction system delivers uniform, collimated ion beams with precisely tunable kinetic energy (100–1200 eV) and current density (>1000 mA total beam current), making it suitable for full-wafer-scale processing of 300 mm (12″) substrates. Designed for integration into ion beam etching (IBE) systems, ion-assisted deposition (IAD) platforms, and in-situ surface conditioning tools, the RFICP-380 meets the stringent requirements of low-defect, high-reproducibility fabrication workflows in IC front-end and backend-of-line (BEOL) applications.

Key Features

• Electrodeless RF-ICP plasma generation: 2 kW RF power at 1.8 MHz with integrated auto-matching network ensures stable plasma ignition and long-term operational consistency without consumable filaments.
• Modular, service-oriented architecture: Discharge chamber, grid assembly, and neutralizer subsystems are independently replaceable—minimizing downtime during maintenance or process requalification.
• OptiBeam™ self-aligning ion optics: Precision-machined molybdenum grids (38 cm Φ) with active thermal and mechanical compensation maintain beam collimation and angular uniformity across the full extraction aperture, extending grid lifetime and ensuring repeatable process windows.
• Multi-mode beam control: Programmable voltage biasing enables real-time selection of collimated, focused, or divergent beam profiles—supporting both anisotropic etching and conformal surface modification.
• Integrated LFN-2000 low-energy electron neutralizer: Maintains charge balance during high-current beam extraction, preventing substrate charging damage and ensuring stable beam transport under varying pressure and gas composition conditions.
• 12″ CF conflat mounting interface with standardized cooling and feedthrough layout: Facilitates drop-in replacement in existing IBE tool frames and simplifies OEM integration per SEMI E10 and E127 mechanical interface guidelines.

Sample Compatibility & Compliance

The RFICP-380 supports a broad range of substrate materials—including Si, SiO₂, Si₃N₄, Al, W, TiN, and compound semiconductors—and operates compatibly with standard cleanroom-grade process gases (Ar, O₂, N₂, and custom mixtures). Its design adheres to vacuum safety standards per ISO 2746 and electrical safety requirements outlined in UL 61010-1 and IEC 61000-6-4 (EMC emissions). For regulated manufacturing environments, the source’s programmable controller supports audit-ready logging (timestamped setpoints, gas flows, voltages, and beam currents) compliant with FDA 21 CFR Part 11 when paired with validated host software. It is routinely deployed in GMP-aligned R&D and pilot-line facilities performing qualification per SEMI F20 (Plasma Process Equipment Standards) and ASTM F1985 (Ion Beam Etch Rate Measurement).

Software & Data Management

The RFICP-380 is operated via a fully programmable digital controller with Ethernet (TCP/IP) and RS-485 interfaces. All operational parameters—including RF forward/reflected power, grid voltages (accel/decel), neutralizer emission current, gas flow setpoints, and interlock status—are accessible through a vendor-neutral Modbus TCP register map, enabling seamless integration into factory-wide SECS/GEM or OPC UA automation frameworks. Process recipes can be stored locally with version-controlled metadata, and real-time telemetry is exportable in CSV or HDF5 format for traceability and statistical process control (SPC). Optional firmware upgrades provide enhanced diagnostics, including plasma impedance trending and grid erosion prediction based on cumulative ampere-hours.

Applications

• High-aspect-ratio ion beam etching of Al, W, and TiN metallization layers in 8″ and 12″ IC fabrication lines.
• Low-damage surface pretreatment prior to ALD or PVD in MEMS inertial sensor and RF filter production.
• Ion-assisted deposition of optical coatings with controlled stress and refractive index tuning (e.g., Ta₂O₅/SiO₂ stacks).
• In-situ ion cleaning of compound semiconductor wafers (GaN, InP) prior to epitaxial regrowth.
• Surface functionalization of polymer substrates for bio-MEMS packaging and microfluidic channel activation.
• Research-scale ion beam milling for TEM lamella preparation requiring sub-5 nm edge roughness.

FAQ

What vacuum compatibility does the RFICP-380 require?
The source is rated for continuous operation at pressures ≤0.5 mTorr and integrates with turbomolecular pumping systems using standard 12″ CF flanges; base pressure compatibility extends down to 1×10⁻⁸ Torr with proper bakeout protocols.
Can the RFICP-380 operate with reactive gases such as Cl₂ or SF₆?
Yes—when configured with corrosion-resistant internal components (optional Mo/Al₂O₃ coated discharge chamber liners), it supports halogen-based chemistries for compound semiconductor etching, subject to material compatibility review.
Is beam uniformity characterized across the full 38 cm aperture?
Yes—KRi provides beam current density maps (±3% non-uniformity over central 30 cm) measured per ASTM F1879, with optional on-site uniformity validation using Faraday cup arrays.
How is grid alignment maintained during thermal cycling?
The OptiBeam™ system incorporates bimetallic compensation elements and kinematic mounting that preserve sub-50 µrad angular stability across operating temperature ranges from 25°C to 120°C.
Does the controller support remote monitoring and predictive maintenance?
Yes—the embedded controller logs >50 real-time parameters with configurable alarm thresholds and exports health metrics (e.g., RF match efficiency drift, neutralizer emission decay rate) for integration into CMMS or AI-driven predictive analytics platforms.