Overview
Polycrystalline Silicon Powder Grade Si99.99 is a high-purity form of silicon, essential for advanced technological applications. It is produced through chemical vapor deposition (CVD) or other refining processes to achieve a purity level of 99.99%. This material is a cornerstone in the semiconductor and photovoltaic industries due to its excellent electrical properties and low impurity content. Polycrystalline silicon powder is distinct from monocrystalline silicon in its granular structure, which makes it suitable for various manufacturing processes. Its high purity ensures minimal defects, making it ideal for sensitive electronic applications. The powder form allows for versatile use in coatings, doping, and other specialized processes.
Physical and Chemical Properties
Polycrystalline Silicon Powder Grade Si99.99 exhibits a gray, powdery appearance with a density of 2.33 g/cm³. It has a high melting point of 1414°C and a boiling point of 3265°C, reflecting its stability under extreme conditions. The material is insoluble in water and most common solvents, ensuring durability in various environments. Key properties include its high electrical conductivity when doped, thermal stability, and resistance to oxidation. The 99.99% purity level ensures minimal contamination, which is critical for semiconductor and solar cell applications. These properties make it a preferred material for high-performance electronic components.
Main Applications
The primary use of Polycrystalline Silicon Powder Grade Si99.99 is in the semiconductor industry, where it serves as a raw material for silicon wafers. These wafers are the foundation of integrated circuits and microchips. Additionally, the powder is used in the production of solar cells, where its high purity maximizes energy conversion efficiency. Other applications include its use in electronic components such as transistors and diodes. The powder is also employed in specialized coatings and as a doping agent to modify the electrical properties of other materials. Its versatility and reliability make it indispensable in high-tech manufacturing.
Safety and Storage
Handling Polycrystalline Silicon Powder Grade Si99.99 requires adherence to safety protocols to prevent inhalation or skin contact. Protective equipment such as gloves, masks, and goggles should be used. The powder should be stored in a dry, cool environment, away from moisture and oxidizing agents to maintain its integrity. In case of exposure, rinse affected areas with water and seek medical attention if necessary. Proper ventilation is essential to avoid dust accumulation, which can pose respiratory hazards. Following these guidelines ensures safe handling and storage of the material.
B2B Procurement Guide
When procuring Polycrystalline Silicon Powder Grade Si99.99, B2B buyers should prioritize suppliers with verified certifications and a track record of quality. Key factors to consider include purity levels, packaging standards, and batch consistency. Requesting material safety data sheets (MSDS) and certificates of analysis (CoA) is recommended. Price ranges vary based on quantity and purity, with typical costs between $20-$50 per kg. Bulk purchases may offer discounts, but buyers should ensure storage capabilities to maintain material quality. Establishing long-term relationships with reputable suppliers can ensure a steady supply of high-quality silicon powder.
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