What are the Diverse Applications of Quartz in Semiconductor Manufacturing?

High-purity quartz materials play a vital role in the semiconductor industry. Their superior high-temperature resistance, corrosion resistance, thermal stability, and light transmission properties make them critical consumables. Quartz products are used for components in both high-temperature and low-temperature zones of wafer production, ensuring the stability and cleanliness of the manufacturing process. As the semiconductor industry evolves, the demand for high-purity quartz continues to grow, driving advancements in production and technology. This article provides an in-depth look at the core applications and market trends of quartz in semiconductor manufacturing.

Properties of Quartz

• Quartz (Silicon Dioxide, SiO₂) is irreplaceable in the semiconductor field due to its near-perfect physical and chemical characteristics8:
• Extreme Purity: Semiconductor-grade quartz typically requires a purity of 99.99% (4N) or higher, sometimes reaching 5N. This ensures that metal ions (such as sodium, potassium, and iron) do not migrate and contaminate the silicon wafers during high-temperature processing.
• Thermal Stability: With a softening point of approximately 1730°C, quartz can operate stably for long periods in high-temperature environments between 1100°C and 1250°C. This makes it a perfect fit for diffusion and oxidation processes.
• Chemical Inertness: Quartz is nearly non-reactive with any acid except for hydrofluoric and hot phosphoric acid. It serves as an ideal carrier for wet cleaning and etching processes.
• Low Thermal Expansion: This property ensures that quartz components do not easily crack during extreme thermal cycles, maintaining dimensional stability for precision manufacturing.

2. Main Applications of Quartz Components in Semiconductor Manufacturing

A. Crystal Growth: Quartz Crucibles

In the first step of wafer manufacturing—the Czochralski (CZ) Method—polysilicon must be melted inside a quartz crucible.

Core Function: The quartz crucible directly contacts the molten silicon. High-quality crucibles reduce excessive oxygen release, ensuring that impurity levels in the monocrystalline silicon ingot are kept to a minimum.

B. Thermal Processes: Quartz Boats & Furnace Tubes

In diffusion, oxidation, and annealing processes, wafers are placed in batches within quartz carriers to enter the diffusion furnace.

Core Function: The Quartz Wafer Boat is responsible for precisely carrying the wafers, while the Quartz Furnace Tube provides a clean, controlled high-temperature reaction environment.

C. Thin Film Deposition: Quartz Shower Heads & Chamber Parts

During CVD (Chemical Vapor Deposition) and ALD (Atomic Layer Deposition) processes, quartz parts are used to guide and distribute reaction gases.

Core Function: The Quartz Shower Head ensures that gas is sprayed uniformly onto the wafer surface, which is crucial for improving the uniformity of nanometer-scale thin films.

D. Wet Cleaning: Quartz Baths

During cleaning stages before and after photolithography, wafers must be immersed in various chemical reagents.

Core Function: Quartz Baths are resistant to strong acid corrosion and do not produce particle contamination, making them a standard in RCA cleaning processes.

3. Market Analysis of Semiconductor Quartz Components

According to the latest industry data, the global semiconductor quartz market is experiencing rapid growth:

4. Industry Trends

Semiconductor process iterations place demanding requirements on material purity. Driven by 7nm and more advanced processes, Synthetic Fused Silica is rapidly replacing traditional natural quartz in etching and lithography processes due to its extremely low metal impurities and excellent plasma resistance. Simultaneously, the industry is transitioning toward integrated precision machining. Manufacturers with ultra-precision CNC capabilities and high-purity raw material integration will hold the high ground in future competition.

Furthermore, green initiatives and recycling are becoming key paths for fabs to reduce costs and increase efficiency. As ESG standards gain weight in the semiconductor supply chain, the precision refurbishment and recycling of high-end quartz components will become a mainstream business model. This helps companies lower production costs and is a necessary choice to meet global carbon neutrality goals. In this process, quartz companies with advanced cleaning technologies and flame-processing repair capabilities will face significant market opportunities.

As a leading semiconductor material supplier, VeTek Semiconductor provides a full range of solutions from quartz crucibles to precision quartz boats. Our products are widely used by major global OEMs and wafer fabs, dedicated to helping customers improve process stability and yield through superior materials and craftsmanship.