In high-end manufacturing fields such as semiconductors, photovoltaics, and new material research and development, the performance of high-temperature reaction vessels directly affects product quality, process stability, and production costs. Large diameter quartz crucibles (diameter ≥ 300mm) and large-sized quartz crucibles (volume ≥ 5L) have become the core equipment for key processes such as single crystal silicon growth, compound semiconductor synthesis, and high-purity material purification due to their high purity, high temperature resistance, thermal shock resistance, and low pollution.

Technical characteristics of large-diameter and large-sized quartz crucibles

1. Materials and processes: high purity and structural stability

Material: Imported high-purity gas fused quartz (SiO ₂ content ≥ 99.998%) or electric fused quartz (SiO ₂ content ≥ 99.995%) is used, with impurity content below 10ppm to avoid metal ion contamination of the reaction material.

Process: Forming through vacuum dehydroxylation, electric melt spinning, cold isostatic pressing and other processes to ensure uniform crucible wall thickness (± 0.2mm) and consistent density (2.2g/cm ⊃3;), reducing the risk of deformation at high temperatures.

Surface treatment: The inner wall is polished to mirror level (Ra ≤ 0.2 μ m), and the outer wall is sandblasted to prevent slipping, reducing material adhesion and cleaning difficulty.

2. Large diameter quartz crucible: Breaking through size limitations and increasing single furnace output

Definition: Quartz crucible with a diameter of ≥ 300mm, mainly used for single crystal silicon growth (such as CZ method Czochralski single crystal furnace).

Technical advantages:

Large capacity: A 320mm diameter crucible can accommodate a silicon material weight of over 150kg, which is 30% higher than the traditional 280mm crucible single furnace output.

Uniform heating: The special arc-shaped bottom design is combined with electromagnetic induction heating to achieve a temperature gradient of less than 5 ℃/cm in the silicon liquid, reducing crystal defects.

Long service life: High purity materials and optimized structure enable the crucible to have a service life of over 120 hours (continuous crystal pulling), reducing the frequency of replacement.

3. Large size quartz crucible: adapted to complex processes to meet diverse needs

Definition: Quartz crucible with a volume of ≥ 5L, covering irregular structures such as cylindrical, square, and conical shapes, suitable for high-temperature solution reactions, gas deposition, and other scenarios.

Technical advantages:

High temperature resistance: It can withstand high temperatures of 1600 ℃ for a long time and up to 1800 ℃ for a short period of time, suitable for the synthesis of compound semiconductors such as silicon carbide (SiC) and gallium nitride (GaN).

Thermal shock resistance: Low coefficient of thermal expansion (5.5 × 10 ⁻⁷/℃), no cracking during rapid heating/cooling, suitable for high-frequency start stop processes.

Chemical inertness: Stable to all acids, bases, salts, and organic solvents except hydrofluoric acid (HF), avoiding reaction contamination.

Core application scenario: Addressing industry pain points and improving process efficiency

1. Semiconductor field: monocrystalline silicon growth and compound semiconductor synthesis

Monocrystalline silicon growth (CZ method):

Problem: Traditional small-diameter crucibles have low single furnace production, and uneven silicon liquid temperature can easily lead to crystal dislocations and excessive oxygen content.

Solution: Large diameter quartz crucibles (such as 360mm diameter) can accommodate more silicon materials, and with optimized arc-shaped bottom design, the crystal oxygen content can be reduced to below 8ppma, dislocation density<10 ⊃3;/cm ⊃2;, meeting the production needs of 12 inch silicon wafers.

Case: After a semiconductor company used large-diameter crucibles, the single furnace output increased from 120kg to 180kg, and the yield rate increased from 85% to 92%.

Synthesis of compound semiconductors (such as SiC, GaN):

Problem: Metal crucibles are prone to alloying with reactants at high temperatures, introducing impurities; Ordinary quartz crucibles have insufficient temperature resistance and are prone to deformation and leakage.

Solution: The large-sized high-purity quartz crucible (with a volume of 10L) can withstand high temperatures of 1800 ℃ without reacting with SiC or GaN, ensuring material purity of ≥ 99.9999% (6N level).

Case: After a silicon carbide substrate manufacturer adopted large-sized quartz crucibles, the uniformity of product resistivity increased by 40%, and batch consistency was significantly improved.

2. Photovoltaic field: Research and development of polycrystalline silicon ingots and high-efficiency batteries

Polycrystalline silicon ingot (DSS method):

Problem: Traditional graphite crucibles react with silicon liquid at high temperatures to generate silicon carbide (SiC) impurities, which reduce battery conversion efficiency.

Solution: A large-sized quartz crucible (such as a volume of 20L) can completely isolate graphite and silicon liquid, reducing the impurity content of polycrystalline silicon to less than 0.1ppma and improving battery efficiency by more than 0.3%.

Case: After using quartz crucibles, a certain photovoltaic enterprise reduced the cost of polycrystalline silicon ingots by 15%, and the product passed T Ü V certification and was exported to Europe.

Efficient battery research and development (such as TOPCon, HJT):

Problem: High temperature diffusion process requires precise control of atmosphere and temperature, and traditional crucibles are prone to gas leakage or temperature fluctuations.

Solution: Customized quartz crucible (with sealing cover and gas inlet and outlet) can achieve ± 1 ℃ temperature control and 0.1sccm gas flow control, ensuring the uniformity of the diffusion layer.

Case: After using a customized quartz crucible in a laboratory, the passivation contact resistance of TOPCon batteries decreased to 50m Ω· cm ⊃2;, and the efficiency exceeded 25%.

3. New material research and development: high-purity material purification and special reaction vessels

Purification of high-purity metals (such as germanium and indium):

Problem: Traditional metal crucibles dissolve and contaminate purified materials at high temperatures, resulting in the inability to meet purity standards.

Solution: Large quartz crucibles (such as 400mm diameter) can withstand high temperatures of 2000 ℃ without reacting with germanium or indium, ensuring a purity of ≥ 99.999% (5N grade) after purification.

Case: After using quartz crucible, a rare metal manufacturer increased the purity of germanium ingots from 4N to 5N, meeting semiconductor grade requirements.

Special reaction vessels (such as vapor deposition, solution growth):

Problem: The reaction requires observing the crystal growth status in a transparent container, as traditional metal or ceramic crucibles are opaque.

Solution: Transparent quartz crucible (such as conical observation window design) can monitor the reaction process in real time and optimize process parameters.

Case: A certain university used a transparent quartz crucible to study the growth of zinc oxide (ZnO) nanowires, successfully observing the dynamic of the "gas-liquid solid" three-phase interface, and published 2 SCI papers.

Customized services: full process support from requirement analysis to delivery

We are well aware that there are differences in the requirements for crucibles among different customers, different thermal field systems, and different process curves. Therefore, we provide comprehensive and flexible customized services to ensure that our products are perfectly matched with your equipment and production processes.

Size customization:

We can customize non-standard diameter, height, and curvature shaped crucibles according to customer provided drawings or technical requirements, perfectly adapting to various imported and domestic single crystal furnaces.

Performance customization:

Purity grading: Provide quartz sand raw materials of different purity grades to meet the different needs of semiconductor grade and photovoltaic grade.

Hydroxyl content regulation: The hydroxyl (OH) content in the crucible wall can be precisely controlled according to the requirements of the crystallization process to adjust its high-temperature softening point and crystallization performance.

Bubble control: Optimize the density and distribution of bubbles in the inner and outer layers to balance the insulation performance and high-temperature strength of the crucible.

Frequently Asked Questions

What diameter specifications are available for custom-made quartz crucibles?

We can customize different diameters based on customers’ specific needs. Common options include small-diameter laboratory crucibles, medium-diameter crystal growth crucibles, and large-diameter crucibles for industrial applications. Specific dimensions must be determined based on furnace chamber space, heating zone size, loading capacity, and process temperature.

How do different diameters affect performance?

Changes in diameter directly affect loading capacity, thermal field distribution, heating and cooling rates, stress distribution, and service life. Selecting the appropriate diameter helps reduce the risk of thermal shock and improves process stability.

In which industries are quartz crucibles suitable?

They can be used in applications such as semiconductor materials research, photovoltaic crystal growth, optical glass melting, compound semiconductor experiments, high-temperature treatment of metals or alloys, vacuum evaporation coating, and high-temperature sintering in laboratories.

Can you provide high-purity quartz crucibles?

We can provide quartz crucible solutions with different purity grades based on the application. For processes that are more sensitive to impurities, such as those involving semiconductors and optical crystals, we can discuss purity, surface treatment, and testing requirements in further detail.

How are the minimum order quantity and lead time determined?

Since quartz crucibles are typically custom-made products, the minimum order quantity, production lead time, and packaging method will be confirmed based on diameter, wall thickness, structural complexity, and testing requirements. We recommend providing specific specifications to obtain a quote and delivery schedule.

From semiconductor single crystal growth to photovoltaic polycrystalline silicon ingots, from compound semiconductor synthesis to high-purity material purification, large-diameter and large-sized quartz crucibles have become indispensable key containers in the high-end manufacturing field due to their core advantages of high purity, high temperature resistance, thermal shock resistance, and low pollution. Through customized design and full process services, we not only provide products, but also offer system solutions for process optimization, efficiency improvement, and cost reduction. Choosing our quartz crucible means choosing a stable, efficient, and sustainable high-temperature process guarantee.

Luverre Quartz manufactures and sells a wide range of high quality quartz glass, including quartz tubes, quartz plates, quartz rods, quartz windows, quartz crucibles, quartz boats, quartz flanges, quartz beakers, quartz glass instruments, and more. We can meet all kinds of customized requirements for quartz glass products.