Angstrom Sun SE Series Spectroscopic Ellipsometer
| Brand | Angstrom Sun |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | SE Series |
| Pricing | Upon Request |
Overview
The Angstrom Sun SE Series Spectroscopic Ellipsometer is a high-precision, application-optimized metrology platform engineered for non-destructive, real-time characterization of thin-film structures in semiconductor R&D, process development, and advanced materials manufacturing. Operating on the fundamental principles of spectroscopic ellipsometry—where polarized broadband light interacts with a sample surface and undergoes measurable changes in amplitude ratio (Ψ) and phase difference (Δ) upon reflection—the system delivers quantitative optical constants (n, k), thickness profiles, interfacial roughness, porosity, and compositional gradients across multilayer stacks. Unlike reflectometry, ellipsometry inherently suppresses intensity-related noise and provides superior sensitivity to sub-nanometer thickness variations and subtle dielectric transitions. The SE Series implements a fixed-analyzer configuration with rotating compensator or dual-rotating-element optics depending on model variant, enabling high signal-to-noise ratio (SNR) measurements over spectral ranges from 190 nm to 1700 nm (UV-VIS-NIR), fully covering critical bandgaps for Si, SiC, GaN, perovskites, and high-k/low-k dielectrics.
Key Features
- Modular goniometer architecture: Choice of manual (SExxxBM) or motorized precision goniometer (SExxxBA) with 0.001° angular resolution and ±0.01° repeatability; vertical optical layout ensures horizontal sample placement for safe handling of wafers up to 300 mm.
- Broadband spectral acquisition: Equipped with back-illuminated CCD or InGaAs array detectors enabling simultaneous capture of >1000 wavelength points per measurement, eliminating scanning delays and enhancing throughput for inline process monitoring.
- Application-specific optical paths: Configurable source options include deuterium-halogen, xenon arc, or tunable laser sources; selectable polarization modulation schemes (rotating compensator, photoelastic modulator) optimized for speed, accuracy, or ultra-thin film sensitivity.
- Robust mechanical design: Thermally stabilized optical bench, vibration-damped baseplate, and kinematic sample stage with motorized Z-height adjustment ensure long-term measurement stability under cleanroom or lab environments.
- Comprehensive angle flexibility: Variable incidence angles from 45° to 90° (with optional low-angle extension down to 30°); multi-angle acquisition supports robust model convergence and reduces parameter correlation in complex stack analysis.
Sample Compatibility & Compliance
The SE Series accommodates rigid substrates including silicon, sapphire, quartz, glass, and metal wafers (up to 300 mm diameter), as well as flexible polymer films and patterned test structures. Vacuum-compatible variants are available for in-situ deposition integration. All models comply with ISO/IEC 17025 calibration traceability requirements when used with NIST-traceable reference standards. Data acquisition and reporting workflows support GLP/GMP documentation needs, including audit trails, electronic signatures, and version-controlled model libraries aligned with FDA 21 CFR Part 11 readiness. Instrument control and data export protocols conform to SEMI E10 (Definition of Equipment Reliability and Maintainability) and E126 (Specification for Data Collection and Reporting) standards.
Software & Data Management
TFProbe™ 3.X software serves as the unified interface for instrument control, optical modeling, regression analysis, and data visualization. It features an intuitive graphical stack builder supporting graded interfaces, roughness layers (Bruggeman effective medium approximation), and dispersion models (Cauchy, Tauc-Lorentz, Cody-Lorentz). The nonlinear least-squares fitting engine employs the Levenberg–Marquardt algorithm with confidence interval estimation and parameter correlation matrix output. Batch processing, script automation (via Python API), and database-driven project management enable reproducible workflows across multiple users and instruments. Export formats include CSV, XML, and HDF5; integrated 2D/3D contour plots support spatial mapping of thickness uniformity and optical dispersion across wafer surfaces.
Applications
- Process control of ALD, PECVD, and sputtered dielectric/metal stacks (SiO₂, SiNₓ, HfO₂, TiN, TaN)
- Characterization of epitaxial layers (SiGe, GaAs, InP) and quantum well heterostructures
- Optical property extraction for transparent conductive oxides (ITO, AZO), perovskite PV absorbers, and 2D materials (MoS₂, WS₂)
- Interface quality assessment in high-mobility channel stacks (e.g., Si/SiO₂, III-V/oxide)
- Porosity quantification in low-k porous silica and aerogel films via effective medium modeling
- Real-time monitoring of etch rate, oxidation kinetics, and annealing-induced phase transitions
FAQ
What is the minimum detectable thickness for ultrathin films using the SE Series?
For single-layer SiO₂ on Si, detection limits reach ≤0.2 nm with optimized modeling and multi-angle acquisition.
Can the system be integrated into a vacuum cluster tool?
Yes—custom UHV-compatible versions with CF flanges and bake-out rated components are available upon specification.
Does TFProbe support user-defined dispersion models?
Yes—custom mathematical expressions and external DLL-based optical models can be imported and embedded in regression routines.
Is training provided for first-time ellipsometry users?
Comprehensive on-site and remote training programs cover fundamentals of ellipsometry, model construction, uncertainty analysis, and SEMI-compliant reporting.
How often does the system require recalibration?
Annual verification against NIST-traceable reference samples is recommended; drift monitoring is automated via built-in reference measurement sequences.
