Product Overview
The 12 inch sapphire substrate from MinnOptics is a precision-engineered wafer for semiconductor and optoelectronic manufacturing.
It is produced using single crystal aluminum oxide (Al₂O₃) with purity above 99.99%.
The substrate is only available in DSP (Double Side Polished) formats.
Each wafer is manufactured with strict control of orientation, thickness, and flatness to meet advanced device process needs.
12 Inch Sapphire Wafer Specification
| Parameters | Specifications |
| Material | High Purity Single Crystal Al2O3 |
| Crystal Growth Method | Kyropoulos (KY) Method |
| Orientation | C-plane (0001) (Off-axis available) |
| Diameter | 300.0 ± 0.2 mm |
| Thickness | 500 – 1500 um ± 25 um (Customizable) |
| Notch Orientation | A-plane |
| TTV | ≤ 10 um |
| Bow | ≤ 50 um |
| Warp | ≤ 150 um |
| Surface Finish (Front) | Epi-ready, CMP Polished, Ra≤ 0.3 nm |
| Surface Finish (Back) | Epi-ready, CMP Polished, Ra≤ 0.3 nm |
| Edge Profile | SEMI Standard Bevel |
| Cleanliness | Class 100 Cleanroom Packed |
| Packaging | FOSB (Front Opening Shipping Box) |
Material Characteristics
Crystal Structure
Sapphire belongs to the hexagonal system and is grown by the Kyropoulos method.
It exhibits strong mechanical and thermal properties suitable for high-precision fabrication.
Chemical Composition
Material: Al₂O₃ ≥ 99.99%.
This high purity ensures minimal impurities, low lattice defects, and stable epitaxial growth.
Orientation Options
Standard: C-plane (0001).
Surface Finish
DSP: Both sides polished to mirror quality for double-sided processing.
Understanding Why 12-Inch Sapphire Wafers are Only Available in DSP
Performance Advantages
Thermal Conductivity
Sapphire provides superior thermal transfer, reducing device heat accumulation.
This supports efficient LED and power semiconductor performance.
Mechanical Strength
High hardness (Mohs 9) and excellent scratch resistance make sapphire ideal for high-throughput processing and repeated thermal cycles.
Optical Transparency
Wide transparency from UV to IR enables use in optical sensors, lenses, and display components.
Chemical Resistance
Stable under acids, alkalis, and plasma exposure.
Suitable for deposition, etching, and high-temperature annealing.
Dimensional Stability
The wafer maintains geometry under high stress.
This supports consistent device alignment and uniform epitaxial layers.
Application Areas
- Semiconductor Substrate: GaN, AlN, and other compound semiconductor epitaxy.
- LED Manufacturing: Blue, green, and white LED production lines.
- Optical Components: Windows, lenses, and IR transmission elements.
- RF and Power Devices: GaN-on-Sapphire, RF amplifiers, and high-voltage modules.
- Research and Development: Wafer-scale optical and thermal studies.
Customization Options
MinnOptics provides flexible customization to meet process requirements:
- Thickness range from 500 µm to 1500 µm.
- Orientation adjustment (on-axis or off-axis).
- Surface treatment including CMP and ultra-flat polishing.
- Edge profile (bevel or chamfer) according to SEMI standards.
All wafers are packed in Class 100 cleanroom conditions and shipped with complete inspection reports.
Packaging & Shipping
Unlike 2-8 inch wafers that use standard cassettes, our 12-inch (300mm) sapphire substrates are packed in professional FOSB (Front Opening Shipping Box).
- Maximum Protection: Designed to prevent contamination and vibration during transit.
- Cleanroom Ready: All wafers are packed in Class 100 cleanroom environments.
- Industry Standard: Fully compatible with automated semiconductor handling equipment.
Rigorous Quality Assurance & Audit-Ready Operations
We understand that consistency and reliability are non-negotiable for 12-inch wafer applications. Our quality management system is engineered not just to meet industry standards, but to seamlessly pass the most stringent supplier qualification processes and technical factory audits demanded by top-tier European and global semiconductor leaders.
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End-to-End Traceability: Every single 12-inch substrate is strictly tracked from the initial crystal boule to the final Double Side Polishing (DSP) stage. We maintain comprehensive manufacturing execution data to ensure complete batch traceability.
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Proven Audit Readiness: We are highly experienced in facilitating comprehensive on-site technical audits. Our transparent production workflows, strict cleanroom protocols, and robust documentation systems are continuously optimized to align with the rigorous expectations of leading international equipment manufacturers and foundries.
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Advanced Metrology & 100% Inspection: Before any FOSB is sealed, our wafers undergo 100% outgoing inspection using state-of-the-art non-contact metrology tools. We strictly monitor critical parameters—including TTV, Bow, Warp, and surface defects—ensuring every wafer delivered perfectly matches your specifications.
Frequently Asked Questions (FAQ)
Q1: What polishing capabilities do you have for 12-inch sapphire wafers?
A: We utilize dedicated 12-inch Double Side Polishing (DSP) equipment. This specialized machinery operates at 2 to 3 times the efficiency of standard equipment, ensuring stable and reliable production capacity for large orders. The DSP process allows us to guarantee superior geometric parameters (such as tighter TTV, Bow, and Warp control) and achieve an exceptional surface roughness of Ra < 0.3 nm.
Q2: Are your sapphire substrates suitable for replacing silicon in epitaxial growth?
A: Absolutely. As an increasing number of foundries transition from silicon to sapphire substrates for advanced epitaxial growth, we have built extensive expertise in this area. We have particularly rich experience in manufacturing the standard 775 μm thickness often required for these applications. Furthermore, we have closely collaborated with numerous research laboratories and equipment manufacturers to fine-tune our substrates, ensuring optimal compatibility with your processing lines.
Q3: How are the 12-inch wafers packaged to ensure safety and cleanliness during transit?
A: All 12-inch sapphire wafers are packaged in brand-new FOSBs (Front Opening Shipping Boxes) within a strict cleanroom environment. This premium packaging method provides maximum protection against physical damage during international shipping while strictly controlling particle counts and preventing any secondary contamination before the wafers reach your facility.
Q4: Do you support custom specifications, and what is the typical lead time?
A: Yes, we fully support customization to meet your specific project requirements, including custom thicknesses, crystal orientations, and specific flat/notch locations. For standard and custom orders of our 12-inch sapphire substrates, the typical lead time is approximately 8 weeks.
