Electronic-grade polycrystalline silicon (bulk)

Product Details

a) Product Features and Advantages

Super high purity standard

Our electronic-grade lump silicon meets purity standards ranging from 9N to 11N. Donor impurity content is controlled under 0.15 ppba, acceptor impurities below 0.10 ppba, and carbon, oxygen content both kept under 0.05 ppma. All indicators fully fit the strict production demands of semiconductor manufacturing.

Solid compact lump structure

We produce lump polysilicon via upgraded Siemens technique. The material forms tight crystal blocks with smooth surfaces and minimal internal impurities. When compared with granular silicon, lump materials have a smaller surface area, which effectively lowers the chance of contamination from surface adsorption. Even after long storage and repeated use, its purity won’t fluctuate easily.

Reliable and consistent purity

Lump polysilicon has been adopted by semiconductor factories for decades, with fully mature manufacturing processes. Mass production over many years has proven its stable purity and good matching with crystal pulling procedures. It’s the universal standard raw material for CZ single crystal production, so clients can use it without extra concerns.

Direct use without re-purification

Our finished goods already reach electronic-grade purity once produced. Clients can directly put them into single crystal furnaces or mix with other silicon materials, skipping extra purification steps. This helps simplify your production workflow and cut extra processing costs.

Uniform quality between different batches

Every production batch will go through full purity inspection and quality verification to guarantee stable chemical composition. Every production step, from raw material input to finished goods delivery, can be traced completely. Clients can place large bulk orders without worrying about unstable production caused by inconsistent batch quality.

Stable, guaranteed supply

We’ve built long-term stable cooperation with top domestic polysilicon manufacturers, including Tongwei, Tianhong, Shenggong, Youyan and other major factories. All stock has clear traceable sources, and we can promise on-time delivery to avoid factory shutdown risks for our partners. Up till now, we’ve kept supplying Mitsubishi Group’s electronic chemical department in Japan for a long time. Our products always satisfy their strict requirements on purity consistency, batch stability and punctual shipment, and we’ve gained consistent positive reviews from their team.

Better overall cost performance

Our pricing is much more competitive than imported silicon brands. Clients can lower raw material procurement expenses, while still getting ultra-high purity and steady product quality at the same time.

b) Product Parameters

• Product Name: Electronic Grade Lump Polysilicon (made by improved Siemens process)
• Appearance: Dense rock-shaped solid blocks, regular size ranges from several centimeters to tens of centimeters. Custom size standards are available upon request.
• Color: Silver grey to dark grey with metallic luster
• Purity Level: Electronic grade, purity above 99.9999999%
• Bulk Resistivity: Over 100 ohm-cm
• Impurity Control: Donor impurities ≤0.15 ppba; Acceptor impurities ≤0.10 ppba; Carbon ≤0.05 ppma; Oxygen ≤0.05 ppma. Heavy metal elements like iron, chromium, nickel and copper are all controlled below industry standard limits.
• Packaging: Double-layer high-purity PE bags plus thick outer protective packaging. We offer 5kg, 10kg, 25kg and ton bag packaging sizes, adjustable based on client demands.

Application Fields

1. Semiconductor single crystal pulling As core raw material for CZ crystal growing, lump silicon can be melted directly inside single crystal furnace crucibles to produce silicon rods of different sizes. These rods will be sliced and polished into silicon wafers for chip production, which is the biggest application of lump polysilicon.
2. Semiconductor silicon blending Based on clients’ unique production needs, we can match lump silicon with silicon particles or other silicon materials at specific mixing ratios. This improves crystal pulling efficiency and balances overall production costs, fitting different production line requirements.
3. High-end power component manufacturing Single crystal rods pulled from our lump silicon can be processed into wafers for IGBT, MOSFET and other power semiconductors. These parts are widely used in new energy vehicles, industrial control equipment and smart power grids.
4. Integrated circuit production Silicon wafers processed from lump silicon through crystal pulling, slicing and polishing work as base substrates for all kinds of chips, including logic chips and storage chips.

Frequently Asked Questions

Q: What’s the difference between lump polysilicon and granular polysilicon? How should I pick the right type?

A: Lump silicon is made with improved Siemens method, forming irregular big blocks that need crushing before use. It has smaller surface area and lower contamination risks, which makes it the most widely used silicon material for semiconductors. Granular silicon is produced by fluidized bed process, forming round even particles without crushing work. It flows smoothly and fits automatic feeding equipment. Both types have their own strengths and suitable usage scenarios. Clients can choose according to their factory equipment and production processes, or mix two types at a proper ratio to get better results.

Q: Do I need to clean or crush lump polysilicon before using it?

A: Our electronic-grade lump silicon is fully cleaned before leaving the factory, so normally no extra cleaning work is needed. If you use it for CZ crystal pulling, you’ll need to crush big blocks into small pieces that fit crucible feeding. Remember to finish crushing inside a dust-free clean room to prevent new impurities mixing in.

Q: How do you make sure product purity and stable batch quality?

A: We test every batch thoroughly, covering purity, resistivity and all impurity indicators, and provide full test reports for each shipment. Our whole production chain has complete traceable records, tracking every batch of raw materials and finished goods. We also support third-party testing if clients want to recheck product quality separately.

Q: What’s your minimum order quantity and delivery cycle?

A: MOQ changes based on your specific demands. For standard stock items, delivery takes 7–15 working days after order confirmation. Exact lead time will be adjusted by order volume, stock situation and shipping methods. We suggest you contact our sales staff in advance to confirm details. Feel free to reach our team for specific price and MOQ information.

Q: Can I get samples for testing?

A: Yes, we provide test samples for clients. Sample quantity is limited, please talk with our sales colleagues to finish the sample application process.

Q: Is this lump silicon usable for photovoltaic production?

A: Electronic-grade polysilicon has far higher purity than solar-grade silicon, so technically it can work for PV manufacturing. But considering cost control, most photovoltaic factories choose solar-grade silicon with 6–7N purity for daily mass production. If you develop high-efficiency solar cells that demand ultra-high purity silicon materials, our electronic-grade lump polysilicon is a viable choice.