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Quartz components for solar cell manufacturing
Solar Photovoltaic Quartz
Quartz glass is used across solar cell manufacturing: crucibles for CZ, MCZ, and DS silicon crystal growth, process tubes and wafer boats for diffusion, and liners, carriers, paddles, and fixtures for deposition and other thermal steps. High-purity fused silica (SiO₂ ≥ 99.99%) withstands the temperatures and keeps metallic contamination low, which protects carrier lifetime and cell efficiency.
FGQuartz supplies these components from stock sizes or to your drawing: any geometry that can be formed or machined from fused silica, with feasibility confirmed in DFM review and prototypes from one piece. Quotes are typically returned within 24 business hours.
Quick answer
Where is quartz glass used in solar cell manufacturing? In crystal growth (crucibles), diffusion and other thermal steps (process tubes, wafer boats, paddles, fixtures), and deposition steps (liners and carriers). Quartz tolerates the process temperatures and keeps metal contamination low, which protects minority-carrier lifetime and cell efficiency.
Key takeaways
- FGQuartz makes CZ crucibles up to 32 in (800 mm) and larger, matched to the puller capacity and thermal profile.
- Solar wafer boats are typically designed for high-density, back-to-back loading to maximize throughput, whereas semiconductor boats prioritize precise single-wafer spacing.
- Diffusion tubes and boats are made for POCl₃ and other solar diffusion chemistries, and for the thermal steps of TOPCon, HJT, and BC lines.
- Quartz is not used in hot alkaline (KOH or NaOH) texturing baths, and it is attacked by HF and hot concentrated phosphoric acid.
Written by the FGQuartz Engineering Team · Updated October 2026
On this page: Why quartz · Process steps · Find components · Formats · Limits · Custom parts · Scenarios · FAQ · Quote
Lead time depends on size and drawing complexity; the quote confirms the schedule.
Why do solar lines use quartz?
Why quartz
Property data is on the technical specifications page.
| Problem | Why ordinary materials struggle | How fused silica helps |
|---|---|---|
| Holding molten silicon | Most containers contaminate the melt or fail at silicon melting temperature. | High-purity fused silica crucibles, including CZ-grade double-layer construction, keep contamination low. |
| Metal contamination during diffusion | Iron, copper, and nickel create recombination centers that cut carrier lifetime. | SiO₂ ≥ 99.99% with controlled metallic impurities keeps contamination off the wafer. |
| Thermal cycling in continuous production | Repeated heating and cooling cracks or distorts many materials. | Thermal expansion of 5.5 × 10⁻⁷ /°C keeps geometry stable through cycles. |
| Aggressive process chemistry | POCl₃ and boron chemistries attack many surfaces; boron is harder on quartz than phosphorus. | Fused silica is inert to the process gases, and boat and tube life can be planned for the harsher boron steps. |
| High-volume cost pressure | Consumables must last and loading density must be high. | Slot geometry and tube design are matched to the wafer format and the line, for density and service life. |
CZ crucibles run near and above the melting point of silicon (about 1414°C), beyond the 1200°C continuous rating of standard quartz parts, and are consumables made for a pulling run.
How is quartz used at each solar manufacturing step?
Process steps
The four steps below cover most solar quartz demand.
Crystal growth: CZ, MCZ, and DS
Workflow
- Load polysilicon into the crucible
- Melt it
- Pull a monocrystalline ingot (CZ / MCZ) or solidify a multicrystalline block (DS)
- Cool and remove
| Point | Detail |
|---|---|
| Where quartz is used | Quartz crucibles for CZ, MCZ, and DS. |
| Why quartz | High-temperature strength, controlled bubble content, and low contamination of the melt. CZ crucibles are double-layer: an opaque outer layer for insulation and a clear, bubble-free inner layer that touches the melt. |
| Watch-outs | Crucible diameter and wall are matched to the puller and its thermal profile. CZ crucibles are generally single-use. Standard crucibles typically ship in 7–14 days; custom sizes take about 3–6 weeks. |
Diffusion and emitter formation
Workflow
- Load wafers into a boat
- Push the boat into the furnace tube
- Diffuse with POCl₃ or a boron source
- Unload
| Point | Detail |
|---|---|
| Where quartz is used | Diffusion tubes, wafer boats, and push paddles and support rods. |
| Why quartz | Thermal uniformity, long service life, and inertness to the process chemistry. Tubes and boats are made for POCl₃ and other solar diffusion chemistries. |
| Watch-outs | Slot geometry is matched to the wafer format, and boats are typically high-density and back-to-back. Boron diffusion on TOPCon lines is more aggressive on quartz than phosphorus, so plan tube and boat life for it. |
LPCVD, tunnel oxide, and polysilicon steps
Workflow
- Load wafers
- Grow tunnel oxide or deposit polysilicon at temperature
- Unload and clean
| Point | Detail |
|---|---|
| Where quartz is used | Process tubes, boats, and liners for the LPCVD and oxidation steps used in TOPCon-type lines. |
| Why quartz | A clean high-temperature environment compatible with the process gases. |
| Watch-outs | Tube and boat cleanliness matters more as the number of high-temperature steps rises. Specify the equipment platform and wafer format. |
PECVD, passivation, and other thermal steps
Workflow
- Load wafers or carriers
- Deposit the anti-reflection or passivation layer
- Anneal or treat as the line requires
| Point | Detail |
|---|---|
| Where quartz is used | Liners, carriers, and chamber components made to match the equipment platform, plus handling paddles and fixtures. |
| Why quartz | Clean surfaces and dimensional compatibility with existing tools. |
| Watch-outs | Process tubes, boats, and custom fixtures are adapted to the thermal steps of TOPCon, HJT, and BC lines. Send the drawing or a worn sample. |
Find the right quartz component by solar process step
Find components
This table points to the product pages that hold the specifications and sizes.
| Process step | Where to look | What is available |
|---|---|---|
| Silicon crystal growth | Quartz crucibles | CZ, MCZ, and DS crucibles to the puller |
| Diffusion and LPCVD | Quartz glass tubes | Process tubes with plain, flanged, or ported ends |
| Wafer loading | Quartz wafer boats | High-density boats for solar formats |
| Handling and supports | Quartz glass rods | Paddles, rails, and supports |
| Covers and windows | Quartz glass plates | Plates and covers for process tools |
| Anything else | Custom quartz glass | Liners, carriers, fixtures, and parts to drawing |
Which formats and sizes are covered?
Formats
| Item | Range |
|---|---|
| CZ crucibles | Up to 32 in (800 mm) and larger, matched to the puller |
| Solar boat wafer formats | Formats from M2 to G12, including M10, G12, and half-cell, confirmed against your wafer |
| Boat slot profiles | Straight-slot and V-groove profiles, standard and extended lengths |
| Non-standard sizes | Built to your drawing or a worn sample |
Confirm the exact format and slot geometry on the RFQ.
When quartz is not the right choice
Limits
Quartz is chosen for purity, thermal stability, and chemical inertness. It is not suited to every environment.
| If your process involves… | Quartz suitability | Consider |
|---|---|---|
| HF (hydrofluoric acid) | Not suitable. HF attacks fused silica. | An HF-compatible material, such as a fluoropolymer |
| Hot concentrated phosphoric acid | Not suitable. | A compatible material for the bath |
| Hot strong alkalis (for example hot KOH or NaOH) | Not suitable; quartz is attacked. | A compatible material for the bath |
| Continuous service above about 1200°C | Beyond the continuous working limit of fused silica. | A higher-temperature ceramic |
Solar wet-process steps use quartz only for chemistries that suit it. Hot alkaline texturing baths do not.
Can FGQuartz make my solar quartz part if it is not on the list?
Custom parts
FGQuartz builds fused silica components to drawing in any geometry that can be formed or machined from fused silica, and confirms feasibility in DFM review. There are three paths:
- Use a standard item from the product pages.
- Modify a standard item: a different size, a port, a flange, a lid, or a changed slot or hole pattern.
- Build to your drawing, sketch, or sample: DXF, STEP, IGES, PDF, a dimensioned sketch, or a worn sample with key dimensions.
Commonly requested
- Boats for a new wafer format, pitch, or loading density
- Crucibles in non-standard diameters for a specific puller
- Liners, carriers, push paddles, and tool-specific fixtures
- Replacements for discontinued or worn parts, reproduced from a sample
Prototypes start from one piece. Simpler custom parts typically take 7–14 days and complex assemblies 3–6 weeks. See custom quartz glass fabrication, thermal processing, and cold processing.
Illustrative scenarios
Scenarios
These are typical requests, not customer case studies.
| Situation | What FGQuartz builds | What to send |
|---|---|---|
| A line moves to a larger wafer format | A boat with slots, pitch, and length for the new format | Wafer format, slot count, pitch, furnace tube ID |
| A puller needs a crucible in a non-standard size | A crucible matched to the puller capacity and thermal profile | Puller model or crucible diameter and height |
| A tool needs a replacement carrier with no drawing | A part reproduced from the worn sample | The sample or photos with key dimensions |
| A TOPCon line is replacing diffusion tubes more often | A tube and boat set planned for the boron steps | Process steps, temperatures, and current service life |
Frequently asked questions
FAQ
More answers are in the full quartz glass FAQ.
Standard crucibles typically ship in 7–14 days; custom sizes or configurations take approximately 3–6 weeks.
Yes. We supply process tubes, wafer boats, and custom fixtures adapted for the thermal steps used in TOPCon, HJT, and BC solar cell lines.
Yes. FGQuartz manufactures diffusion tubes and wafer boats specifically engineered for POCl3 and other solar diffusion process chemistries.
Yes. Solar boats are typically optimized for high-density, back-to-back loading to maximize throughput, while semiconductor boats prioritize precise single-wafer spacing for process uniformity.
FGQuartz manufactures CZ crucibles up to 32″ (800mm)+ diameter, matched to your puller capacity and thermal profile.
CZ/MCZ crucibles for silicon crystal growth, diffusion tubes, and wafer boats for cell processing lines including TOPCon, HJT, and BC architectures.