Plasma FIB (pFIB) Testing for Large-Area Cross-Section & Sample Preparation
Discover the power of Plasma FIB (P-FIB) in advanced materials analysis. This article explores how P-FIB technology combines high precision with enhanced imaging, its scope, test procedure, sample size, and the pros & cons of the milling capabilities, offering significant improvements in sample preparation, 3D tomography, and nanofabrication for research and industrial applications.
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Precision-driven testing for dimensional accuracy and compliance
- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
Plasma FIB (P-FIB) is a potent, versatile tool and platform for material characterization, sample preparation, and nanoscale machining. Although it leverages traditional gallium-based FIB systems, a plasma ion source delivers higher ion currents, enabling higher milling rates and enabling operation over larger areas. Plasma-FIB provides the precision cutting, polishing, and imaging of semiconductors and metals in biological tissues. Many of the diverse applications of plasma-FIB relate to the general sectors of material science, nanotechnology, and electronics.
Scope, Applications, and Benefits
Scope
FIB plasma is used in various fields, including semiconductor manufacturing, materials research, and failure analysis. The technique described here enables the study of material microstructure, defect analysis, and cross-sectional imaging when conventional FIB methods are not feasible due to source limitations or stringent time constraints.
Applications
- Semiconductor failure analysis and advanced node device inspection
- TEM and STEM sample preparation, including large-area lamellae
- 3D tomography and volume reconstruction of materials
- Integrated circuit delayering and backside analysis
- Microelectronics packaging analysis (TSVs, solder joints, interconnects)
- Materials science research for metals, ceramics, polymers, and composites
- MEMS and micro-mechanical device modification.
Benefits
- Enables high-speed material removal, significantly faster than Ga⁺ FIB for large-volume milling
- Allows precise cross-sectioning and trenching with minimal redeposition
- Supports deep and wide cuts while maintaining good edge quality
- Reduces beam-induced damage compared to conventional ion sources for certain materials
- Capable of processing hard, brittle, and composite materials
- Suitable for advanced nanofabrication and microstructural analysis
Testing Process
Sample Preparation
Mount and ground the specimen to ensure stability and minimize charging.
1Area Selection
Identify and align the region of interest using electron/ion imaging.
2Plasma FIB Processing
Perform milling, trenching, or cross-sectioning with controlled plasma-ion-beam settings.
3Imaging & Analysis
Image the processed area and collect structural or compositional data.
4Technical Specifications
| Parameter | Details |
|---|---|
| Ion Source | Plasma ion source (Xe⁺ commonly used) |
| Beam Current Range | High beam currents up to several microamperes |
| Milling Capability | Large-area, high-rate material removal |
| Resolution | Nanometer-scale precision for cross-sectioning |
| Operating Environment | High-vacuum system |
| Applications | Cross-sectioning, delayering, sample prep for SEM/TEM |
Instrumentation Used
- Plasma Focused Ion Beam system
- Plasma ion source (Xe or similar)
- Electron beam column for imaging (SEM)
- Gas injection system (GIS)
- High-precision sample stage
- Vacuum system
- Imaging and control software
Results and Deliverables
- Enables advanced material analysis and nanofabrication capabilities.
- Provides significantly faster milling compared to traditional FIB systems and volume electron microscopy.
- Supports high-precision processing at micro- and nano-scale levels.
- Modernizes industries that rely on accurate nanoscale characterization.
- Widely applicable across semiconductor manufacturing, materials research, and biological sciences.
- Delivers fast, precise, and high-resolution results for a broad range of materials
- Enhances nanoscale fabrication, failure analysis, and cross-sectional imaging
- Ongoing advancements are expanding versatility, performance, and application scope in materials science and engineering.
Frequently Asked Questions
Plasma-focused ion beam milling scanning electron microscopy (plasma-FIB SEM) combines improved sputtering efficiency with nanometer imaging resolution at room temperature or under cryogenic conditions. This can provide fast-end pointing during 3D imaging.
Ga Ions used by DB FIB tend to attach to the sample surface; instead, Xe used by P FIB reduces sample contamination by Ga Ions. P FIB can run over large areas more than 20 times faster than DB FIB.
Focused ion beam, or FIB, is a site-specific material analysis, deposition, and ablation technique primarily employed in the semiconductor industry, materials research, and, increasingly, the biological area. An apparatus used in science that mimics an SEM is called a fiber optic bar (FIB) configuration.
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