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High-Purity Opaque Quartz Shield & Shutter For MOCVD
The high-purity Opaque Quartz components is engineered for semiconductor MOCVD processes, including critical consumables such as Heat Shields and precision Shutters. Leveraging a unique internal micro-bubble scattering mechanism, these components convert localized thermal radiation into highly uniform far-infrared surface radiation, significantly enhancing epitaxial layer uniformity. Featuring≥99.999% purity and an extremely low coefficient of thermal expansion, they provide superior heat shielding at temperatures above 1100℃while reducing energy consumption and preventing metallic contamination—making them an ideal, cost-effective solution for high-volume production lines.
Description
Microstructure: The dense micro-bubble structure provides superior thermal scattering performance.
Opaque Quartz: The "Uniform Temperature Barrier" for MOCVD Processes
Our High-Purity Fused Opaque Quartz is far more than standard quartz material. It is manufactured through a specialized fusion process that introduces a high volume of uniform micro-bubbles, with diameters precisely controlled between 10-100µm. These bubbles are the core of the material's exceptional thermal performance:
● Infrared Scattering & Far-Infrared (FIR) Conversion:
Primary radiation from MOCVD heating elements (such as tungsten filaments or graphite) consists mainly of Near-Infrared (NIR) light. Transparent quartz is almost entirely permeable to NIR, leading to localized heat concentration and "hot spots" on the substrate. The internal bubbles in opaque quartz facilitate countless internal reflections and scattering, effectively blocking direct NIR penetration. The heat is absorbed and re-emitted as more uniform Far-Infrared (FIR) surface radiation. This conversion ensures an extremely homogeneous thermal field within the MOCVD chamber, which is critical for achieving high-quality, uniform epitaxial layers.
● Ultra-High Purity & Low Hydroxyl (OH) Content:
For front-end semiconductor processes, we strictly control SiO2 purity at the 5N (99.999%) level and maintain Hydroxyl (OH) content at < 5ppm. This ensures that in high-vacuum environments exceeding 1000℃, no harmful metallic ions or moisture are released, protecting the integrity of sensitive quantum well structures.
| Element | Typical Content (ppm) | Detection Method |
| Aluminum (Al) | < 15 | ICP-OES |
| Calcium (Ca) | < 1.0 | ICP-OES |
| Iron (Fe) | < 0.5 | ICP-OES |
| Sodium (Na) | < 1.0 | ICP-OES |
| Hydroxyl (OH) | < 5 | FTIR |
| Total Purity | ≥99.999% | Calculated |
Applications
Typical Application Scenarios
Our opaque quartz components are not just replacements; they are solutions optimized for specific thermal processing challenges.
Scenario A: MOCVD Chamber Protection for Compound Semiconductors (GaN, SiC)
● Pain Point: During the growth of GaN or SiC, high temperatures and corrosive precursor flows (such as Ammonia NH3 and TMGa) lead to heavy byproduct deposition on expensive chamber walls and graphite heaters. This results in frequent downtime for Preventive Maintenance (PM) and increased Cost of Ownership (CoO).
● Solution: Utilizing high-purity opaque quartz as a Heat Shield (Chamber Liner) provides a cost-effective "sacrificial layer." While collecting deposits, its superior insulation protects the stainless steel chamber walls, extending the PM cycle by more than 30%.
Scenario B: Interface Control in Multi-Quantum Well (MQW) Structures
● Pain Point: Fabricating ultra-thin MQW structures for LEDs or lasers requires atomic-level precision in precursor gas switching. Any thermal deformation or mechanical lag in the Shutter causes "Interface Broadening," significantly degrading the device's optoelectronic performance.
● Solution: Our Precision Quartz Shutters leverage the extremely low coefficient of thermal expansion of opaque quartz. This ensures perfect flatness and structural stability during high-speed switching and rapid thermal cycling, enabling true "Atomic Layer Control."
