CVD diamond films/membrane/foil for electronic components

CVD diamond films/membrane/foil for electronic components

CVD diamond films are among the most advanced materials for thermal management in high-power and high-density electronics. Their value as heat spreaders comes from a unique combination of physical and chemical properties that few materials can match.

Key Advantages of CVD Diamond Heat Spreaders

1. Exceptional Thermal Conductivity

CVD diamond exhibits thermal conductivity in the range of 1200–2200 W/m·K, exceeding copper (~400 W/m·K) and even high-end graphite. Heat transport is dominated by lattice vibrations (phonons), making it highly efficient and stable across a wide temperature range.

This is governed by the phonon transport mechanism in the diamond lattice.

---

2. Electrical Insulation

Unlike metals, diamond is electrically insulating (wide bandgap ~5.5 eV), which allows:

• Direct integration with semiconductor devices
• Elimination of additional insulating layers
• Reduced parasitic capacitance

---

3. Low Thermal Expansion

Diamond has a very low coefficient of thermal expansion (~1 ppm/K), which is close to:

• Silicon
• Gallium Nitride

 This minimizes thermal stress and improves reliability in power cycling environments.

---

4. High Thermal Stability & Chemical Inertness

• Stable up to ~700–800°C in air 
• Resistant to corrosion and radiation
• Ideal for harsh environments (space, nuclear, plasma systems)

---

5. High Breakdown Strength

Useful in high-voltage applications where insulation and thermal dissipation must coexist.

---

6. Tailorable via Doping or Composite Integration

• Can be doped (e.g., boron-doped diamond) for semi-conductive behavior
• Can be metallized (Ti, Mo, W layers) for better interface bonding

---

 Typical Applications

1. Power Electronics

Used as heat spreaders or substrates for:

• Gallium Nitride (GaN HEMTs)
• Silicon Carbide (SiC MOSFETs)

 Enables higher power density, reduced junction temperature, and longer device lifetime.

---

2. RF & Microwave Devices

Critical in high-frequency, high-power systems:

• Radar modules
• Satellite communications
• 5G/6G base stations

Diamond improves thermal handling in GaN-on-diamond architectures.

---

3. Laser Diodes & Photonics

• High-power laser diode heat sinks
• Optical windows (due to transparency + thermal performance)

Used in:

• Industrial lasers
• Medical lasers
• Defense systems

---

4. Advanced Packaging & 3D Integration

• Heat spreaders in chiplets and stacked ICs
• Replacement for Cu/Mo or AlN substrates

Especially important as power densities exceed 1 kW/cm².

---

5. Aerospace & Defense

• Thermal management in satellites and avionics
• Radiation-resistant electronics
• High-power microwave tubes (e.g., gyrotrons)

---

6. Emerging Applications

• AI accelerators and high-performance computing (HPC)
• Electric vehicle power modules
• Fusion and EUV lithography systems

SEMIXICON DIASEMI standard diamond films models in bulk supply 

www.semixicon.com

High-Performance Diamond Optical Windows for Extreme Photonic Applications

 

High-Performance Diamond Optical Windows for Extreme Photonic Applications

In advanced optical systems—such as EUV lithography high-power laser windows, wafer laser annealing systems, and microwave windows in gyrotrons for controlled nuclear fusion—conventional optical materials are limited by narrow spectral transmission, poor environmental stability, and low damage thresholds.

SEMIXICON DIASEMI  has developed high-performance diamond optical materials featuring ultra-broad spectral transmission and exceptional multi-physics stability, providing comprehensive  technical solution for next-generation optical windows.

---

Ultra-Broad Spectral Transmission & Superior Optical Properties

Diamond’s unique crystal structure enables transmission across an exceptionally wide spectral range—from ultraviolet to microwave—while maintaining outstanding physical and chemical robustness:

• High Transmittance
  • Single-crystal IR transmittance: >71%
  • Polycrystalline IR transmittance: >70%
  • Stable transmission across UV, IR, and microwave regimes
• Extreme Stability
  • Chemically inert: resistant to acids and alkalis
  • Ultra-high hardness (Mohs 10): superior wear and impact resistance
  • High thermal shock and radiation resistance
  • No performance degradation over long-term operation

Compared with conventional materials such as optical glass, sapphire, and ZnS, diamond offers significantly enhanced durability and broader operational bandwidth.

---

Precision Manufacturing: Large Size + High Accuracy

Enabled by in house developed advanced MPCVD processes, both single-crystal and polycrystalline diamond optical components are produced in bulk now with high consistency:

• Large-Area Capability
  • Single crystal: up to 20 × 20 mm
  • Polycrystalline: up to Ø100 mm
• Ultra-Precision Finishing
  • Surface roughness: < 3 nm
  • Parallelism: < 5 μm
  • Figure accuracy: < 1 μm
• Custom Engineering
  Fully customizable in size, shape, and thickness for applications including Raman laser optics, gyrotron microwave windows, and high-power CO₂ laser systems.

---

Application Coverage: Enabling Next-Generation Technologies

Diamond optical windows are critical enablers across multiple frontier domains:

• High-Power Laser Systems
  High thermal conductivity minimizes thermal lensing and ensures beam quality and long-term stability
• Radiation & X-ray Systems
  High transmission and low absorption make diamond ideal for synchrotron, medical imaging, and NDT applications
• High-Power Microwave Devices
  Excellent thermal and dielectric properties support reliable transmission of megawatt-level microwave energy
• Extreme Environments

www.diasemi.us