High purity Polycrystalline silicon 3N(99.9%), 4N(99.99%), 5N(99.999%), 6N(99.9999%)

Polycrystalline silicon purity: 3N, 4N, 5N, 6NSi:≥99.9%
Polycrystalline silicon Application: As the raw material used in the production of Czochralski single crystal silicon wafers, polysilicon is the substrate upon which essentially all semiconductors are produced. For semiconductor applications, polycrystalline silicon is changed into single crystalline silicon and then single crystalline wafers to become electrical components such as integrated circuits, which are embedded in electronic devices as main components
Polysilicon is also a key component for silicon-based solar cells. For solar cell applications, polycrystalline silicon is a material for making crystalline-type silicon solar power cells that use mono-crystalline or multi-crystalline silicon for substrates

Our Solar Polycrystalline silicon is available in a wide variety of form factors including Polycrystalline silicon rod, Polycrystalline silicon chunks, Polycrystalline silicon chips and fines. We have more than 10 years of Polycrystalline silicon manufacturing expertise.

Polycrystalline silicon storage: Store in a cool, dry location away from heat, sparks and open flame. Do not store with oxidizing agents, halogens or acids.

Silicon Powder Specifications:

Polycrystalline silicon Type Chemical Composition %
Si
3N Polycrystalline silicon 99.9
4N Polycrystalline silicon 99.99
5N Polycrystalline silicon 99.999
6N Polycrystalline silicon 99.9999
Polycrystalline silicon: supply different grades high purity polycrystalline silicon ingot, polycrystalline silicon chunk according to client's requirements.

Polycrystalline silicon applications

The semiconductor and PV industries presently consume about 80,000 Metric Tons (MT) per year, the full current capacity of all polysilicon suppliers. These large users each produce millions of silicon wafers each month. This requires thousands of tons of polysilicon each month, which is used to produce the silicon ingots and wafers needed to fill large orders from the Integrated Circuit Industry and the Photovoltaics Industry.

These large users concentrate on supplying the top 50 –100 device manufacturers with high technology wafers, producing the larger silicon wafer diameters (200 and 300 mm), with exacting purity, geometric, electrical and crystal perfection standards. They also supply the photovoltaic cell producers with wafers sizes and crystallinity designed for high efficient, cost effective solar cells.

Polycrystalline silicon semiconductor applications

The large producers of silicon wafers, such as Shin-Etsu Handoti, MEMC, Wacker, Sumco, and KEM, supply over one hundred million silicon wafers to the large integrated circuit manufacturers, such as Intel, Texas Instruments, Motorola, AMD, Toshiba, and Samsung, so require thousands of metric tons (MT) per year of polysilicon. There are over 300 semiconductor companies with over 1000 IC fabrication lines using silicon wafers.

Czochralski Crystal Growth

The semiconductor wafer suppliers use the Czochralski (Cz) crystal growth process to convert polysilicon chunks into single crystal silicon ingots. In the Cz process, chunks of polysilicon are loaded into a quartz crucible in a Cz growth furnace. The crucible is heated to about 1400 deg. C., melting the polysilicon into a liquid. A small single crystal rod (seed) of the proper crystalline orientation is dipped into the rotating melt and the seed rod slowly withdrawn, while rotating. By controlling the temperature, pull rate, and rotation rates, perfect single crystals of 4, 6, 7, 8, or 12 inch diameter can be grown. The process takes about one and a half days for ingots for IC use, and a shorter time for ingots for solar cells, where the degree of crystallinity is not as critical.

The diameter of the crucible determines how much polysilicon can be loaded into the crucible. A crucible at 18 inch diameter will hold about 60 kg of poly, allowing growth of a 27 inch long 8 in. diameter ingot. A crucible at 24 inch diameter will hold about 150 kg of poly, allowing growth of a 67 inch long 8 in. diameter ingot.

The smaller diameter top and tail of the ingot are about 20% of the ingot length; and about 5% of the molten silicon is left in the bottom of the crucible, called potscrap. The tops and tails can be reused in another growth run or sold in the solar cell market. The potscrap can be processed, removing the attached quartz, and reused or sold in the solar cell market. 

Polycrystalline silicon photovoltaic applications

The solar cell wafer suppliers use the Czochralski crystal growth process, the Modified Cz crystal growth process (EFG, string, ribbon), or the Multi-Crystalline Growth Process (Directional solidification, casting) to produce silicon ingots, ribbons, or blocks for processing into round or rectangular wafers.

 

 

Polycrystalline silicon packaging Details:
Polycrystalline silicon 25kg/bags. paper and plastics bags
Can pack the goods according to customer's requirement
Polycrystalline silicon 3N(99.9%), 4N(99.99%), 5N(99.999%), 6N(99.9999%)

 

Polycrystalline silicon sample available & policy

Let our technical expertise and experience handle all of your requirements. We manufacture polycrystalline silicon broad range of sizes from our factories, we have a team of engineers who lend their specialized skill sin technical design to meet your exacting specifications. Samples are available at a cost, and always handled and delivered as quickly as possible.

Guarantees/Warranties/Terms and Conditions.

The quality of our products is guaranteed, Delivery guaranteed in 10 days after confirmation of order.