What Is Dynamic Secondary Ion Mass Spectrometry (Dynamic SIMS)?
Dynamic Secondary Ion Mass Spectrometry (Dynamic SIMS or d-SIMS) is an ultra-sensitive surface analysis technique that determines the elemental and isotopic composition of solid materials. Known for its sensitivity and resolution, d-SIMS is a trusted method to measure dopants and trace elements, including light elements and even hydrogen.
Quantitative Analysis
Depth Profiling
Ultra-Sensitive Detection
Why Use Dynamic SIMS?
Dynamic SIMS offers a powerful combination of high sensitivity, depth profiling, and quantitative analysis, making it an essential tool for material characterization. By sputtering the sample surface with a focused ion beam and analyzing the ejected secondary ions, the technique provides detailed information on elemental and isotopic composition across different sample layers. This allows for precise measurement of trace elements and dopants, even at parts-per-billion levels, while generating depth profiles for thin films, interfaces, and layered structures.
Dynamic SIMS is particularly valuable in applications where both surface and subsurface composition matter, including semiconductors, energy research, materials science, and geology, helping researchers and engineers gain actionable insights into complex materials.
Comprehensive Insight
Versatile Applications
High-Resolution Profiling
How Dynamic SIMS Works
Dynamic SIMS (d-SIMS) involves bombarding a sample with a focused ion beam-typically O₂⁺, Cs⁺, or Ar⁺-to sputter surface material and generate secondary ions for analysis. A mass spectrometer analyzes these ions to identify elements and create a depth profile of elemental concentrations. Unlike ToF-SIMS, which uses pulsed low-current ions and measures flight times, d-SIMS employs a continuous high-current beam and filters ions by mass using magnetic or quadrupole analyzers.
d-SIMS offers high sensitivity, detecting elements down to parts per billion, and excellent depth resolution, which is ideal for analyzing thin films, interfaces, and layered structures.
Equipment Used for Dynamic SIMS
CAMECA IMC 7f
- High-precision analysis: Measures elemental and isotopic composition in glass, metals, ceramics, and other demanding materials.
- Advanced depth profiling: Delivers excellent depth resolution across a wide dynamic range.
- High sensitivity: Dual reactive ion sources and a high-transmission mass spectrometer enable fast sputtering and low detection limits.
- Flexible imaging: Supports direct ion microscopy, scanning imaging, and microprobe analysis.
- Reliable automation: Enables continuous operation with minimal intervention and reproducibility below 0.5% RSD.
Key Differentiators
| Property | Dynamic SIMS |
|---|---|
| Surface Sensitivity | Few nm |
| Elemental Detection Range | All elements and isotopes |
| Mass Range | From 1 to >10,000 atomic mass units |
| Resolution | Mass resolution: 25000 ppm |
| Typical Detection Limit | On the ppb level |
| Parallel Detection | Up to 7 masses |
| Quantification | Quantitative with relevant reference |
| Chemical State Information | Limited |
| Molecular Detection | Yes |
| Imaging Capability | Limited to ion spot size |
| Lateral resolution | 1mic |
| Depth Profiling | Up to 10 microns profiling |
| Depth Resolution | ~1nm |
| Sputter Rate | Up to 0.5mic/min |
| Destructive Analysis | Yes |
| 3D analysis | Combines spatial and depth information for 3D chemical reconstruction |
Strengths
- Broad elemental/isotopic coverage with wide mass range (1 to >10,000 amu): Supports detection of virtually all elements and their isotopes for comprehensive materials characterization.
- Parallel detection of up to 7 masses enables efficient targeted analyses: Simultaneously tracks multiple elements or isotopes to improve throughput and consistency.
- High reproducibility and stability (RSD < 0.5%) for consistent results: Instrument stability and calibrated workflows deliver highly repeatable measurements.
Limitations
- Quantification requires specific standards because matrix effects cause an element’s signal intensity to depend on the surrounding material, making direct comparison between different samples unreliable.
- Depth Profiling is Destructive: Obtaining depth profiles requires sputtering (removing) material, which inherently alters the sample.
- Limited Chemical Information: d-SIMS primarily provides information about the elemental and molecular composition of a surface. It offers limited information about the chemical state or bonding environment of the detected species.
Sample Requirements
- UHV-compatible.
- Flat and clean surfaces are preferred.
- Sample size of 1 in. (2.5cm) diameter, not more than 1 cm height.
Dynamic SIMS Industry Applications
Materials Science
- Depth Profiling: Measures composition at various sample depths, crucial for studying thin films, layers, and coatings.
- Elemental Analysis: Identifies the presence and location of elements and their isotopes.
Energy & Battery Research
- Depth Profiling: Characterizes the distribution of elements and impurities within battery electrodes.
- Solid Electrolyte Testing: Examines trace dopants and contaminants in solid electrolytes.
Semiconductors
- Dopant Profiling: Measures dopant concentrations within semiconductor structures.
- Impurity Detection: Detects trace contaminants and defect sites in microelectronic devices.
Dynamic SIMS is a versatile technique used across industries, from profiling dopants in semiconductors and solar cells, to analyzing trace elements in alloys, nuclear materials, biological tissues, geological samples, and even forensic or environmental evidence, thanks to its excellent sensitivity and depth profiling capabilities.
Techniques That Complement Dynamic SIMS
Why Choose Covalent for Your d-SIMS Needs?
Covalent provides precise Dynamic SIMS analysis supported by advanced instrumentation, rigorous depth and concentration calibration, and deep expertise in surface science. With rapid turnaround times, tailored sample preparation, and clear, actionable results, we deliver reliable material characterization for demanding research and industrial applications.