Teltec Semiconductor Pacific RIE-ICP Dual-Mode Reactive Ion Etcher

Overview

The Teltec Semiconductor Pacific RIE-ICP Dual-Mode Reactive Ion Etcher is a precision-engineered plasma processing system designed for advanced failure analysis (FA) and semiconductor sample preparation in analytical laboratories. It operates on the fundamental principles of low-pressure plasma physics—combining capacitive-coupled (RIE/PE) and inductively coupled (ICP) radiofrequency excitation to generate high-density, controllable ion fluxes. Unlike conventional thermal or wet chemical methods, this system enables non-destructive, layer-selective material removal with sub-micron spatial control—critical for delayering integrated circuits, exposing buried interconnects, and preparing cross-sectional specimens without inducing mechanical stress or thermal damage. Its architecture supports both isotropic (lateral undercut-controlled) and anisotropic (vertical profile-preserving) etching regimes, making it indispensable for root-cause investigation across front-end-of-line (FEOL) and back-end-of-line (BEOL) structures.

Key Features

• Dual-mode RF excitation: Independent 13.56 MHz RIE/PE source and 2 MHz/13.56 MHz ICP source enable precise decoupling of ion energy and ion density—essential for balancing etch rate, selectivity, and sidewall profile.
• High-throughput delayering: Integrated plasma accelerator technology achieves up to 20× higher etch rates for nitride and oxide layers compared to standard RIE configurations—reducing analysis cycle time without compromising endpoint detection fidelity.
• Full-wafer compatibility: Configurable chuck systems support substrates from individual die (chip-scale) to full 300 mm wafers, with uniform plasma distribution verified per SEMI F20 and ISO 14644-1 Class 5 cleanroom requirements.
• Process reproducibility: Digital mass flow controllers (MFCs), cryo-pumped vacuum chamber (<5 × 10⁻⁷ Torr base pressure), and real-time optical emission spectroscopy (OES) endpoint monitoring ensure batch-to-batch consistency compliant with GLP and internal FA SOPs.
• Low-damage operation: Optimized gas chemistries (e.g., CF₄/O₂ for SiO₂, CHF₃/Ar for Si₃N₄, Cl₂/BCl₃ for Al/Cu) minimize substrate heating and ion-induced lattice damage—preserving microstructural integrity for subsequent TEM or SEM inspection.

Sample Compatibility & Compliance

The system accommodates diverse sample formats including unpackaged dies, molded IC packages (QFN, BGA, WLCSP), TSV-enabled 3D stacks, and full-wafer assemblies. It supports industry-standard FA workflows aligned with JEDEC J-STD-033, IPC-TM-650, and ASTM F2157 for plasma-assisted deprocessing. All process recipes are traceable and auditable under FDA 21 CFR Part 11–compliant software logging. Chamber materials (anodized aluminum, quartz viewports, ceramic insulators) meet SEMI E19 purity specifications for metallic contamination control (<1 × 10¹⁰ atoms/cm²).

Software & Data Management

The embedded control interface provides recipe-driven automation with parameter locking, version history, and user-role-based access control. Real-time OES spectra are timestamped and stored alongside chamber pressure, RF power, gas flows, and temperature logs—enabling correlation between spectral signatures and etch endpoints. Exported datasets conform to ASTM E1395 and ISO/IEC 17025 reporting standards. Audit trails include operator ID, timestamp, parameter modifications, and system alarms—fully supporting GMP-aligned lab quality management systems.

Applications

• Anisotropic etching of interlayer dielectrics (ILD) and intermetal dielectrics (IMD) for via/trench exposure in BEOL analysis.
• Isotropic removal of polyimide passivation layers without undercutting underlying Al/Cu traces.
• Selective stripping of Si₃N₄ capping layers prior to metal stack analysis.
• Low-k dielectric (e.g., carbon-doped oxides) etching with minimized carbon residue using tailored O₂/CF₄ chemistries.
• TEOS-based oxide deposition-integrated etch sequences for maskless trench definition in prototype fabrication.
• Package-level delayering of epoxy mold compound (EMC) and underfill materials using optimized Ar/O₂ plasma blends.

FAQ

What plasma modes does this system support, and how do they differ in FA applications?
It supports RIE/PE (capacitively coupled) for moderate ion energy and isotropic profiles, and ICP (inductively coupled) for high-density plasma with independent ion energy control—ideal for high-selectivity, anisotropic oxide/nitride etching.
Can the system handle both bare dies and fully packaged devices?
Yes—fixture adapters and adjustable sample stages accommodate singulated dies, wire-bonded packages, and wafer-level modules without requiring mechanical fixturing modifications.
Is endpoint detection integrated, and what methodology is used?
Optical emission spectroscopy (OES) is standard, with configurable wavelength bands (e.g., 280 nm for Si, 394 nm for Al, 427 nm for F radicals) and derivative-based algorithmic thresholding for layer breakthrough detection.
Does the system comply with semiconductor laboratory safety and data integrity standards?
It meets SEMI S2/S8 safety guidelines, includes interlocked chamber access, and supports 21 CFR Part 11-compliant electronic records and signatures for regulated environments.
What maintenance protocols are recommended to ensure long-term plasma stability?
Quarterly RF matching network calibration, annual OES spectrometer wavelength verification, and routine chamber cleaning using NF₃ plasma ashing per Teltec’s documented PM schedule.