4inch Sapphire Wafer DSP Diameter 100mm Thickness 500μm Ra ≤ 0.2nm For Micro-LED
The 4-inch sapphire wafer is a high-quality optical-grade substrate fabricated from single-crystal aluminum oxide (α-Al₂O₃) via Edge-defined Film-fed Growth (EFG) or Kyropoulos (KY) methods, with standard dimensions of 100mm±0.2mm diameter and customizable thickness (0.3-1.0mm). Compared to 6-inch wafers, the 4-inch sapphire wafer offers greater cost efficiency for R&D and small-batch production, particularly suited for applications requiring high crystalline quality but not large-area formats, such as UV LEDs, RF devices, and specialized sensors. Its balanced performance and affordability make it ideal for research institutions, startups, and small-to-medium chip manufacturers.
Key Characteristics
1. 4inch sapphire wafer of High Purity: 99.999% pure with superior surface finish and flatness, meeting stringent application requirements.
2. 4inch sapphire wafer of exceptional Mechanical Properties:High hardness, strength, and impact resistance, suitable for high-temperature growth environments and mechanical processing.
3. 4inch sapphire wafer of outstanding Optical Performance: High transmittance (>85%) with broad-band transparency (UV to mid-IR), ideal for diverse optical applications.
4. 4inch sapphire wafer of strong Chemical Stability: Corrosion-resistant and wear-resistant, ensuring long-term performance in harsh environments.
5. 4inch sapphire wafer of excellent Electrical Insulation: Superior insulating properties make it an ideal substrate for large-scale integrated circuits (ICs) and SOI thin-film fabrication.
Technical Parameters
| Property |
4inch |
| Diameter |
100±0.1mm
|
| Thickness |
200±15um
|
|
500 ± 15 um
|
|
650±15um
|
| Roughness |
Ra ≤ 0.2nm
|
| Warp |
≤ 10um
|
| TTV |
≤ 10um
|
| Scratch/Dig |
20/10
|
| Polish |
DSP (Double Side Polished); SSP(Single Side Polished) |
| Shape |
Round, Flat 16mm；OF length 22mm; OF Length 30/32.5mm; OF Length47.5mm; NOTCH; NOTCH; |
| Edge Form |
45°,C Shape |
| Material |
Sapphire crystal, Fused Quartz JGS1/JGS2; BF33, D263; EXG glass. |
| Remarks |
All specifications above can be customized upon your request |
Primary Applications
1. 4inch sapphire wafer of LED Industry: Used as a substrate for LED chips (blue/green LEDs), meeting demands in lighting and display technologies.
2. 4inch sapphire wafer of semiconductor Manufacturing: Essential for GaN/AlGaN LEDs and power devices, serving as an optimal substrate for SOCs and superconducting thin-film structures.
3. 4inch sapphire wafer of optical Components: Applied in optical windows, laser elements, and thermoluminescent detectors due to high transmittance and stability.
4. 4inch sapphire wafer of medical Devices: Utilized in medical optical lenses for high-end equipment, leveraging its high-temperature resistance, corrosion resistance, and precision.
5. 4inch sapphire wafer of research & Industrial Use: Critical for scientific experiments and industrial components (e.g., cutting/polishing wafers).
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