12-Inch Glass Wafer for Advanced Semiconductor & MEMS Applications

The 12-inch (300mm) glass wafer is a high-end substrate designed for advanced semiconductor manufacturing, MEMS devices, optical systems, and wafer-level packaging (WLP / FOWLP). As device integration continues to increase and packaging structures become more complex, large-diameter glass wafers are becoming a critical alternative to traditional silicon substrates.

Compared with smaller wafer formats, 12-inch glass wafers offer significantly higher production efficiency, better scalability for mass production, and compatibility with advanced lithography and packaging processes. They are widely used in next-generation electronic systems that require high dimensional stability, low dielectric loss, excellent optical transparency, and ultra-smooth surface quality.

These wafers are manufactured using high-purity materials such as borosilicate glass, fused silica, quartz, and alkaline-free glass, depending on application requirements. Each wafer undergoes precision cutting, grinding, polishing, and cleaning processes to ensure strict control over flatness, thickness uniformity, and surface roughness.

Available Material Types for 12-Inch Glass Wafer

Borosilicate Glass (12-inch wafer)

• Excellent thermal expansion matching with silicon (~3.2 ppm/K)
• Ideal for anodic bonding applications
• High chemical resistance
• Stable mechanical properties during thermal cycling
• Widely used in MEMS and packaging structures

Quartz Glass (12-inch wafer)

• Extremely high optical transmission (UV to IR range)
• Very low impurity and OH content
• High temperature resistance
• Surface roughness down to Ra ≤ 0.5 nm
• Suitable for optical MEMS and photonics

Fused Silica (12-inch wafer)

• Ultra-low thermal expansion (~0.5 ppm/K)
• High purity synthetic material
• Excellent thermal shock resistance
• Optical transmission >90% (200–2000 nm range)
• Ideal for high-end optical and semiconductor applications

Alkaline-Free Glass (12-inch wafer)

• Free from heavy metal contamination (As, Sb, Ba, halides)
• Low fluorescence background
• High dielectric stability
• Compatible with advanced semiconductor processes
• Excellent chemical durability

Key Technical Specifications (12-Inch Glass Wafer)

Dimensional Parameters

• Wafer diameter: 300 mm (12 inch)
• Thickness range: 500 μm – 2000 μm (customizable)
• Thickness tolerance: ±5 μm to ±20 μm
• Total Thickness Variation (TTV): ≤ 10–15 μm (high precision grade)

Kvalita povrchu

• Surface roughness (Ra): ≤ 1.0 nm standard
• Ultra-polished option: Ra ≤ 0.5 nm
• Surface flatness: ≤ λ/10 (optional high-grade specification)
• Edge treatment: chamfered / rounded / custom profile
• Double-side polished (DSP) or single-side polished (SSP) available

Material Performance (Reference Values)

Manufacturing Capabilities

Our 12-inch glass wafers are produced under advanced precision manufacturing conditions:

• High-precision CNC shaping and slicing
• Chemicko-mechanické leštění (CMP)
• Sub-nanometer surface finishing technology
• Cleanroom-grade cleaning and inspection
• Thickness and flatness metrology control
• SEMI / JEIDA standard compatibility (where applicable)

We support both prototype development and large-scale mass production.

Applications of 12-Inch Glass Wafer

12-inch glass wafers are widely used in next-generation advanced industries:

• Semiconductor wafer-level packaging (WLP / FOWLP)
• MEMS sensors and actuators
• Photonic integrated circuits (PIC)
• Optical communication modules
• Advanced display technologies (OLED / MicroLED)
• Automotive sensing systems (LiDAR, radar, imaging)
• Biochip and medical diagnostic devices
• High-frequency RF and microwave components
• Precision optical systems and lithography platforms

Advantages of 12-Inch Glass Wafer

• Full compatibility with 300mm semiconductor production lines
• Excellent dimensional stability for large-area processing
• Ultra-low surface roughness (<1 nm Ra)
• High optical transparency (depending on material type)
• Superior electrical insulation properties
• High chemical and thermal stability
• Suitable for high-volume manufacturing environments
• Customizable thickness, material, and surface finish

FAQ (Frequently Asked Questions)

Q1: Can 12-inch glass wafers replace silicon wafers in semiconductor applications?

12-inch glass wafers are not a full replacement for silicon wafers in active device fabrication, but they are widely used as advanced substrate or carrier materials in semiconductor packaging, MEMS, and photonic systems. Glass wafers offer superior electrical insulation, optical transparency, and lower dielectric loss, making them ideal for wafer-level packaging (WLP), fan-out WLP (FOWLP), and optical integration applications where silicon is not required as an active semiconductor layer.

Q2: What level of flatness and surface quality can you achieve for 12-inch glass wafers?

For high-precision 12-inch glass wafers, we can achieve extremely tight surface control. Typical specifications include:

• Surface roughness (Ra): ≤ 1.0 nm (standard grade), down to ≤ 0.5 nm (ultra-polished grade)
• Total Thickness Variation (TTV): ≤ 10–15 μm depending on material and thickness
• Surface flatness: down to λ/10 (optional high-end specification)

These parameters ensure excellent compatibility with advanced lithography, bonding, and thin-film deposition processes.

Q3: Can 12-inch glass wafers be customized for specific applications or process requirements?

Yes. 12-inch glass wafers are highly customizable. We can adjust multiple parameters according to your process requirements, including:

• Material type (borosilicate, quartz, fused silica, alkaline-free glass)
• Thickness (from 500 μm up to 2 mm or more)
• Surface finish (SSP or DSP polishing)
• Edge profile (chamfered, rounded, or custom edge design)
• Flatness, TTV, and surface roughness levels
• Special patterns, alignment marks, or laser engraving

Customization is especially important for MEMS, optical systems, and advanced packaging applications where process compatibility is critical.