Thin Films
Process Overview
Deposition adds thin films of various materials onto the wafer surface. These layers form the transistors, interconnects, and insulating regions. Think of it as building a nano-scale
### Process Overview
Deposition adds thin films of various materials onto the wafer surface. These layers form the transistors, interconnects, and insulating regions. Think of it as building a nano-scale layer cake with different materials.
### Major Deposition Types
#### 1. Chemical Vapor Deposition (CVD)
- Materials deposited through chemical reactions
- Types:
- LPCVD (Low Pressure)
- PECVD (Plasma Enhanced)
- MOCVD (Metal Organic)
- ALD (Atomic Layer Deposition)
#### 2. Physical Vapor Deposition (PVD)
- Materials deposited through physical processes
- Types:
- Sputtering
- Evaporation
- Epitaxy
### Equipment Breakdown
#### CVD Systems
1. **PECVD Tools**
- Manufacturers:
- Applied Materials (Producer® platform)
- Lam Research (VECTOR® series)
- ASM International
- Cost: $4-12 million per tool
- Applications: Dielectrics, nitrides
2. **ALD Systems**
- Manufacturers:
- ASM International
- Tokyo Electron
- Picosun
- Cost: $2-8 million per tool
- Applications: High-k dielectrics, metal gates
#### PVD Systems
1. **Sputtering Tools**
- Manufacturers:
- Applied Materials (Endura® platform)
- ULVAC
- Evatec
- Cost: $3-10 million per tool
- Applications: Metal layers, barriers
2. **Epitaxy Systems**
- Manufacturers:
- ASM International
- Applied Materials
- Tokyo Electron
- Cost: $5-15 million per tool
- Applications: Silicon layers, III-V compounds
### Materials & Precursors
#### CVD Precursors
- Silane (SiH4)
- TEOS
- TMG (Trimethylgallium)
- Suppliers:
- Air Liquide
- Merck
- SK Materials
- Cost: $500-5000 per kg
#### PVD Targets
- Suppliers:
- Materion
- JX Nippon
- Tosoh
- Materials:
- Aluminum
- Copper
- Titanium
- Tantalum
- Cost: $5,000-50,000 per target
### Facility Requirements
- Class 10-100 cleanroom
- Process gas infrastructure
- Cooling water systems
- Power: 50-200 kW per tool
- Setup cost: $20-40 million
### Technical Specifications
#### CVD
- Deposition rate: 1-100 nm/min
- Thickness uniformity: <±2%
- Step coverage: >95%
- Defect density: <0.1/cm²
#### PVD
- Deposition rate: 10-1000 nm/min
- Uniformity: <±3%
- Step coverage: 30-70%
- Target lifetime: 200-2000 kWh
### Market Dynamics
- Leaders:
- Applied Materials (~40%)
- Tokyo Electron (~25%)
- ASM International (~15%)
- High demand for ALD tools
- Growing focus on selective deposition
### Technical Challenges
1. Advanced Nodes:
- Conformality in high aspect ratios
- Interface quality
- Selective deposition
- Stress control
2. Production:
- Particle contamination
- Precursor costs
- Target utilization
- Throughput vs quality
### Future Trends
- Area-selective deposition
- Combined PVD/ALD systems
- In-situ metrology
- Novel precursor developmentBy Eduarda Ferreira