Applications
Semiconductor Wafer Fabrication
Fused quartz, sapphire, and technical ceramic components for diffusion, CVD, plasma etch, CMP, and wet cleaning processes in silicon wafer manufacturing.
Fused Quartz & Ceramics in Semiconductor Wafer Fabrication
Silicon wafer fabrication (the “front end” of semiconductor manufacturing) requires process components that survive extreme temperatures, aggressive chemistries, and plasma environments while limiting contamination risk to the silicon wafer. Fused quartz, sapphire, and technical ceramics are commonly reviewed for these requirements because the final material choice depends on process conditions and cleanliness targets.
Process-by-Process Component Guide
Thermal Oxidation & Diffusion (600–1200°C)
The oldest and most established semiconductor processes — growing SiO₂ on silicon or diffusing dopants (B, P, As) — use horizontal or vertical furnaces lined with quartz hardware.
| Component | Material | Function |
|---|---|---|
| Process tube (inner) | Synthetic fused silica Grade 2 | Reaction chamber; low-contamination material selection to be confirmed by grade |
| Process tube (outer) | Natural fused quartz Grade 1 | Thermal isolation |
| Wafer boat | Fused quartz Grade 1 or 2 | Holds wafers at pitch ±0.1 mm |
| Baffles | Fused quartz Grade 1 / Opaque Grade 3 | Gas flow conditioning |
| Push rod | Fused quartz Grade 1 | Boat loading/unloading |
| Flange | Fused quartz Grade 1 | Tube-to-furnace interface |
Low-Pressure CVD (LPCVD)
LPCVD deposits thin films (poly-Si, SiO₂, Si₃N₄, WSi₂) at 600–900°C and pressures of 0.1–10 Torr. The deposition environment is corrosive to metals and requires ultra-low contamination quartz hardware.
| Component | Material | Key Requirement |
|---|---|---|
| Reactor tube | Synthetic fused silica Grade 2 | Trace-metal requirements to be confirmed by material certificate; polished inner bore where specified |
| Gas injector | Synthetic fused silica Grade 2 | Hole array and leak-testing requirements reviewed from drawing and application |
| Wafer boat | Synthetic fused silica Grade 2 | Slot pitch and contamination-control requirements reviewed by process |
| Viewport window | Fused quartz or sapphire | In-situ monitoring |
Plasma Etch (RIE, ICP, CCP)
Reactive plasma etching (fluorine, chlorine, bromine chemistry) operates at room temperature but subjects chamber hardware to intense ion bombardment. Quartz is preferred for its self-passivating behavior in fluorine plasma.
| Component | Material | Why |
|---|---|---|
| Focus ring / edge ring | Fused quartz Grade 1 | Self-limiting fluorine attack; low contamination |
| Dome / liner | Fused quartz Grade 1 | Plasma-facing enclosure |
| Viewport | Sapphire | Superior plasma erosion resistance vs. quartz |
| Chamber liner | Alumina 99.5% | Longer life in Cl₂/Br₂ chemistry than quartz |
Wet Cleaning Chemistry Review
Wet chemical cleaning removes particles, organics, and metals from wafer surfaces before and after deposition steps.
| Component | Material | Chemistry Handled |
|---|---|---|
| Cleaning tank | Fused quartz Grade 1 | Chemistry compatibility reviewed by concentration, temperature, and exposure time |
| Overflow tank | Fused quartz Grade 1 | DI water rinse |
| Gas sparger | Fused quartz Grade 1 | O₃, N₂ bubbling |
| Wafer cassette | Fused quartz or alumina | Part carrier in chemical bath |
Rapid Thermal Processing (RTP)
RTP systems heat a single wafer from room temperature to > 1000°C in seconds using tungsten-halogen or arc lamps. The transparent quartz or SiC reactor dome must transmit radiant energy and survive thermal shock.
| Component | Material | Key Requirement |
|---|---|---|
| Process dome | Fused quartz Grade 2 | Optical transmission and birefringence requirements reviewed by application |
| SiC susceptor | Reaction-bonded SiC | Thermal-shock and operating-temperature requirements reviewed by process |
| Pyrometry window | Sapphire | Mid-IR transparency for temperature measurement |
| Quartz window | Synthetic fused silica | Lamp-to-process zone light transmission |
Why Tuguan for Semiconductor Components?
- Material-aware machining controls — contamination-control requirements can be discussed by material family and process
- Controlled cleaning and packaging workflow — cleanliness requirements should be confirmed before quotation
- Synthetic fused silica options — trace-metal requirements are reviewed against available material certificates
- Project-specific QC package — dimensional, surface, leak, and material documentation can be discussed based on order requirements
- Replacement parts program — OEM-compatible focus rings, boats, and tubes to drawing