Quartz Wafer Manufacturer & Exporters serving Liège

Precision Quartz Wafers & Fused Silica Substrates for the Liège High-Tech Basin

The Meuse-Rhine technological corridor, anchored by Liège Science Park and research hubs associated with the University of Liège (ULiège), represents one of Western Europe’s most demanding epicenters for photonics, space engineering, biotechnology, and micro-electromechanical systems (MEMS). Navigating the performance thresholds of advanced devices requires substrate materials with extreme dielectric performance, near-zero coefficient of thermal expansion, and unparalleled optical transmittance from the deep ultraviolet (DUV) through mid-infrared (MIR) wavelengths. As an established manufacturer and international exporter of synthetic and natural fused silica, Kavri Quartz bridges state-of-the-art Chinese raw crystal processing with the precise engineering specifications required by European research institutions and commercial foundries in Wallonia.

1. Chemical Purity and Optical Metrology of Quartz Wafers

Quartz wafers (fused silica / fused quartz disks) are fundamental to modern semiconductor fabrication, advanced lithography masks, optofluidics, and microwave devices. Unlike standard borosilicate or soda-lime glass, fused silica consists almost entirely of silicon dioxide (SiO₂ > 99.999%), eliminating metallic trace contaminants that cause ionic migration, high dielectric loss, and microstructural defects.

• Synthetic Fused Silica (CVD / Soot-Remelting Process): Characterized by negligible bubble content (Class 0 per DIN 58927), virtually zero heavy metal inclusion (< 1 ppm total metals), and an OH⁻ hydroxyl content precisely regulated between dry (< 1 ppm OH) for IR transparency and wet (~1200 ppm OH) for extreme DUV excimer laser resistance down to 193 nm.
• Thermal Stability and Thermal Shock Immunity: Fused quartz features an exceptionally low coefficient of thermal expansion (CTE) of approximately 5.5 × 10⁻⁷ /°C between 20°C and 320°C. This allows Liège aerospace component designers and thin-film deposition specialists to subject wafers to rapid thermal processing (RTP) up to 1100°C without mechanical rupture or bow distortion.
• Surface Micro-Roughness and Flatness Metrology: Our cleanroom polishing lines achieve double-sided optical polishing (DSP) delivering surface roughness Ra < 0.5 nm (Atomic Force Microscopy verified), total thickness variation (TTV) < 2 µm on 100 mm and 150 mm wafers, and local thickness variation (LTV) compliant with stepper lithography requirements.

2. Dimensional Standards and Custom Fabrications for Cleanrooms

Whether for wafer-level packaging (WLP), anodically bonded MEMS sensors, or laser window carrier substrates, our production lines fabricate wafers matching SEMI specifications as well as custom non-standard geometries:

• Diameters: Standard 2-inch (50.8 mm), 3-inch (76.2 mm), 4-inch (100 mm), 6-inch (150 mm), 8-inch (200 mm), and up to 12-inch (300 mm) diameter blanks.
• Thickness Tolerances: Ultra-thin wafers starting at 100 µm ± 5 µm up to standard 500 µm, 625 µm, 725 µm, and heavy substrate plates of 1.0 mm to 10.0 mm.
• Edge Finishing & Orientation: Precision C-shape, bevel, or T-cut rounded edges to mitigate particulate flaking in high-vacuum chambers. SEMI standard orientation flats or laser-engraved alignment notches can be positioned with an angular accuracy of ± 0.2°.
• Cleanroom Washing & Packaging: Class 100 (ISO Class 5) final DI water megasonic clean, followed by vacuum sealing in single-wafer coin boxes or 25-capacity cleanroom cassettes with non-outgassing antistatic Tyvek wrapping to ensure particle-free delivery directly into Liège cleanrooms.